id
stringlengths 12
12
| format
stringclasses 2
values | title_ko
stringlengths 0
811
⌀ | title_en
stringlengths 0
1.26k
⌀ | journal
dict | authors
listlengths 0
15
| abstract_ko
stringlengths 0
4k
⌀ | abstract_en
stringclasses 100
values | keywords
stringclasses 157
values | citation_count
stringclasses 5
values | doi
stringlengths 0
127
⌀ | url
stringclasses 101
values | file_source
stringlengths 23
23
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|
ART001935687
|
oai_dc
|
Symplectic analysis of functionally graded beams subjected to arbitrary lateral loads
|
Symplectic analysis of functionally graded beams subjected to arbitrary lateral loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Li Zhao(Ningbo University of Technology); Wei Z. Gan(Ningbo University of Technology)"
] |
The rational analytical solutions are presented for functionally graded beams subjected to arbitrary tractions on the upper and lower surfaces. The Young’s modulus is assumed to vary exponentially along the thickness direction while the Poisson’s ratio keeps unaltered. Within the framework of symplectic elasticity, zero eigensolutions along with general eigensolutions are investigated to derive the homogeneous solutions of functionally graded beams with no body force and traction-free lateral surfaces. Zero eigensolutions are proved to compose the basic solutions of the Saint-Venant problem, while general eigensolutions which vary exponentially with the axial coordinate have a significant influence on the local behavior. The complete elasticity solutions presented here include homogeneous solutions and particular solutions which satisfy the loading conditions on the lateral surfaces. Numerical examples are considered and compared with established results, illustrating the effects of material inhomogeneity on the localized stress distributions.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001935690
|
oai_dc
|
Seismic mitigation of an existing building by connecting to a base-isolated building with visco-elastic dampers
|
Seismic mitigation of an existing building by connecting to a base-isolated building with visco-elastic dampers
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zhidong Yang(The Hong Kong Polytechnic University); Eddie S.S. Lam(The Hong Kong Polytechnic University)"
] |
This study investigates the feasibility of retrofitting an existing building by connecting theexisting building to a new building using connecting dampers. The new building is base-isolated and viscoelastic dampers are assigned as connecting dampers. Scaled models are tested under three different earthquake records using a shaking table. The existing building and the new building are 9 and 8 storiesrespectively. The existing building model shows more than 3% increase in damping ratio. The maximum dynamic responses and the root mean square responses of the existing building model to earthquakes are substantially reduced by at least 20% and 59% respectively. Further, numerical models are developed by conducting time-history analysis to predict the performance of the proposed seismic mitigation system. The predictions agree well with the test results. Numerical simulations are carried out to optimize the properties of connecting dampers and base isolators. It is demonstrated that more than 50% of the peak responses canbe reduced by properly adjusting the properties of connecting dampers and base isolators.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001935706
|
oai_dc
|
Strain and crack development in continuous reinforced concrete slabs subjected to catenary action
|
Strain and crack development in continuous reinforced concrete slabs subjected to catenary action
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Dirk Gouverneur(Ghent University); Robby Caspeele(Ghent University); Luc Taerwe(Ghent University)"
] |
Several structural calamities in the second half of the 20th century have shown that adequatecollapse-resistance cannot be achieved by designing the individual elements of a structure without taking their interconnectivity into consideration. It has long been acknowledged that membrane behaviour of reinforced concrete structures can significantly increase the robustness of a structure and delay a complete collapse. An experimental large-scale test was conducted on a horizontally restrained, continuous reinforced concrete slab exposed to an artificial failure of the central support and subsequent loading until collapse of the specimen. Within this investigation the development of catenary action associated with the formation of large displacements was observed to increase the ultimate load capacity of the specimen significantly. The development of displacements, strains and horizontal forces within this investigation confirmed a load transfer process from an elastic bending mechanism to a tension controlled catenary mechanism. In this contribution a special focus is directed towards strain and crack development at critical sections. The results of this contribution are of particular importance when validating numerical models related to the development of catenary action in concrete slabs.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001935688
|
oai_dc
|
Design for shear strength of concrete beams longitudinally reinforced with GFRP bars
|
Design for shear strength of concrete beams longitudinally reinforced with GFRP bars
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Job Thomas(Cochin University of Science and Technology); S. Ramadass(Cochin University of Science and Technology)"
] |
In this paper, a model for the evaluation of shear strength of fibre reinforced polymer (FRP)-reinforced concrete beams is given. The survey of literature indicates that the FRP reinforced beams testedwith shear span to depth ratio less than or equal to 1.0 is limited. In this study, eight concrete beamsreinforced with GFRP rebars without stirrups are cast and tested over shear span to depth ratio of 0.5 and1.75. The concrete compressive strength is varied from 40.6 to 65.3 MPa. The longitudinal reinforcementratio is varied from 1.16 to 1.75. The experimental shear strength and load-deflection response of the beamsare determined and reported in this paper. A model is proposed for the prediction of shear strength of beamsreinforced with FRP bars. The proposed model accounts for compressive strength of concrete, modulus ofFRP rebar, longitudinal reinforcement ratio, shear span to depth ratio and size effect of beams. The shearstrength of FRP reinforced concrete beams predicted using the proposed model is found to be in betteragreement with the corresponding test data when compared with the shear strength predicted using theeleven models published in the literature. Design example of FRP reinforced concrete beam is also given inthe appendix.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001935698
|
oai_dc
|
Analytical study of buckling profile web stability
|
Analytical study of buckling profile web stability
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Chems eddine Taleb(University of Sciences and Technology); Fatiha Ammari(University of Sciences and Technology); Redouane Adman(University of Sciences and Technology)"
] |
Elements used in steel structures may be considered as an assembly of number of thin flat walls. Local buckling of these members can limit the buckling capacity of axial load resistance or flexural strength. We can avoid a premature failure, caused by effects of local buckling, by limiting the value of the wall slenderness which depend on its critical buckling stress. According to Eurocode 3, the buckling stress is calculated for an internal wall assuming that the latter is a simply supported plate on its contour. This assumption considers, without further requirement, that the two orthogonal walls to this wall are sufficiently rigid to constitute fixed supports to it.
In this paper, we focus on webs of steel profiles that are internal walls delimited by flanges profiles. The objective is to determine, for a given web, flanges dimensions from which the latter can be considered as simple support for this web.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001935691
|
oai_dc
|
Crash analysis of military aircraft on nuclear containment
|
Crash analysis of military aircraft on nuclear containment
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.R. Sadique(Indian Institute of Technology Roorkee); M.A. Iqbal(Indian Institute of Technology Roorkee); P. Bhargava(Indian Institute of Technology Roorkee)"
] |
In case of aircraft impact on nuclear containment structures, the initial kinetic energy of theaircraft is transferred and absorbed by the outer containment, may causing either complete or partial failureof containment structure. In the present study safety analysis of BWR Mark III type containment has beenperformed. The total height of containment is 67 m. It has a circular wall with monolithic dome of 21mdiameter. Crash analysis has been performed for fighter jet Phantom F4. A normal hit at the crown ofcontainment dome has been considered. Numerical simulations have been carried out using finite elementcode ABAQUS/Explicit. Concrete Damage Plasticity model have been incorporated to simulate thebehaviour of concrete at high strain rate, while Johnson-Cook elasto-visco model of ductile metals havebeen used for steel reinforcement. Maximum deformation in the containment building has reported as 33.35mm against crash of Phantom F4. Deformations in concrete and reinforcements have been localised to theimpact region. Moreover, no significant global damage has been observed in structure. It may be concludedfrom the present study that at higher velocity of aircraft perforation of the structure may happen.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001935694
|
oai_dc
|
A new mindlin FG plate model incorporating microstructure and surface energy effects
|
A new mindlin FG plate model incorporating microstructure and surface energy effects
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"F.F. Mahmoud(Zagazig University); M. Shaat(Zagazig University)"
] |
In this paper, the classical continuum mechanics is adopted and modified to be consistent withthe unique behavior of micro/nano solids. At first, some kinematical principles are discussed to illustrate the effect of the discrete nature of the microstructure of micro/nano solids. The fundamental equations and relations of the modified couple stress theory are derived to illustrate the microstructural effects on nanostructures. Moreover, the effect of the material surface energy is incorporated into the modified continuum theory. Due to the reduced coordination of the surface atoms a residual stress field, namely surface pre-tension, is generated in the bulk structure of the continuum. The essential kinematical and kinetically relations of nano-continuums are derived and discussed. These essential relations are used to derive a size-dependent model for Mindlin functionally graded (FG) nano-plates. An analytical solution is derived to show the feasibility of the proposed size-dependent model. A parametric study is provided to express the effect of surface parameters and the effect of the microstructure couple stress on the bending behavior of a simply supported FG nano plate.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002048186
|
oai_dc
|
Experimental investigations on the structural behaviour of a distressed bridge
|
Experimental investigations on the structural behaviour of a distressed bridge
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.A. Dar(MSRIT); N. Subramanian(Computer Design Consultants); A.R. Dar(NIT Srinagar); J. Raju(MSRIT)"
] |
Distressed structures require necessary remedial measures in order to restore their original structural properties like strength and stiffness. Validating the effectiveness of the proposed qualitative remedial measure experimentally is of utmost importance as there is no well-established analytical method to verify the effectiveness of the same quantitatively. Prototype testing which would have been the best option for this purpose would not only prove costly but also be associated with numerous practical difficulties; hence model testing is resorted as the only option for the purpose. This paper presents one such typical experimental study on the structural behavior of a distressed bridge, mainly observed in the form of prominent tilt in the bearing plate in transverse and longitudinal direction on downstream side. The main focus of the proposed experimental investigation is to assess the structural behavior particularly the load carrying capacity. The extent of deformation of some models with specific structural arrangements and some models with specific need based remedial measures were also studied. This study also assessed the contribution of each remedial measure towards restoration individually and collectively
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002048184
|
oai_dc
|
The effect of rotation on piezo-thermoelastic medium using different theories
|
The effect of rotation on piezo-thermoelastic medium using different theories
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohamed I.A. Othman(Zagazig University); Ethar A. A. Ahmed(Taif University)"
] |
The present paper attempts to investigate the propagation of plane waves in generalized piezo-thermoelastic medium under the effect of rotation. The normal mode analysis is used to obtain the expressions for the displacement components, the temperature, the stress and the strain components.
Comparisons are made with the results predicted by different theories (Coupled theory, Lord-Schulman, Green-Lindsay) in the absence and presence of rotation.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002048176
|
oai_dc
|
Effect of gas detonation on response of circular plate- experimental and theoretical
|
Effect of gas detonation on response of circular plate- experimental and theoretical
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hashem Babaei(University of Guilan); Tohid Mirzababaie Mostofi(University of Guilan); Seyed Hamidreza Sadraei(University of Guilan)"
] |
A series of experimental results on thin mild steel plates clamped at the boundary subjected to gas detonation shock loading are presented. Detonation occurred by mixing Acetylene (C2H2)-Oxygen (O2) in various volume ratio and different initial pressure. The applied impulse is varied to give deformation in the range from 6 mm to 35 mm. Analytical modeling using energy method was also performed. Dependent material properties, as well as strain rate sensitivity, are included in the theoretical modeling. Prediction values for midpoint deflections are compared with experimental data. The analytical predictions have good agreement with experimental values. Moreover, it has been shown that the obtained model has much less error compared with those previously proposed in the literature.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002048185
|
oai_dc
|
Optimum topology design of geometrically nonlinear suspended domes using ECBO
|
Optimum topology design of geometrically nonlinear suspended domes using ECBO
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Kaveh(Iran University of Science and Technology); M. Rezaei(Road, Building and Housing Research Center)"
] |
The suspended dome system is a new structural form that has become popular in the construction of long-span roof structures. Suspended dome is a kind of new pre-stressed space grid structure that has complex mechanical characteristics. In this paper, an optimum topology design algorithm is performed using the enhanced colliding bodies optimization (ECBO) method. The length of the strut, the cable initial strain, the cross-sectional area of the cables and the cross-sectional size of steel elements are adopted as design variables and the minimum volume of each dome is taken as the objective function. The topology optimization on lamella dome is performed by considering the type of the joint connections to determine the optimum number of rings, the optimum number of joints in each ring, the optimum height of crown and tubular sections of these domes. A simple procedure is provided to determine the configuration of the dome.
This procedure includes calculating the joint coordinates and steel elements and cables constructions. The design constraints are implemented according to the provision of LRFD-AISC (Load and Resistance Factor Design-American Institute of Steel Constitution). This paper explores the efficiency of lamella dome with pin-joint and rigid-joint connections and compares them to investigate the performance of these domes under wind (according to the ASCE 7-05), dead and snow loading conditions. Then, a suspended dome with pin-joint single-layer reticulated shell and a suspended dome with rigid-joint single-layer reticulated shell are discussed. Optimization is performed via ECBO algorithm to demonstrate the effectiveness and robustness of the ECBO in creating optimal design for suspended domes.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002048182
|
oai_dc
|
Wind load estimation of super-tall buildings based on response data
|
Wind load estimation of super-tall buildings based on response data
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lun-hai Zhi(Wuhan University of Technology); Bo Chen(Wuhan University of Technology); Ming-xin Fang(Wuhan University of Technology)"
] |
Modern super-tall buildings are more sensitive to strong winds. The evaluation of wind loads for the design of these buildings is of primary importance. A direct monitoring of wind forces acting on super-tall structures is quite difficult to be realized. Indirect measurements interpreted by inverse techniques are therefore favourable since dynamic response measurements are easier to be carried out. To this end, a Kalman filtering based inverse approach is developed in this study so as to estimate the wind loads on super-tall buildings based on limited structural responses. The optimum solution of Kalman filter gain by solving the Riccati equation is used to update the identification accuracy of external loads. The feasibility of the developed estimation method is investigated through the wind tunnel test of a typical super-tall building by using a Synchronous Multi-Pressure Scanning System. The effects of crucial factors such as the type of wind-induced response, the covariance matrix of noise, errors of structural modal parameters and levels of noise involved in the measurements on the wind load estimations are examined through detailed parametric study. The effects of the number of vibration modes on the identification quality are studied and discussed in detail. The made observations indicate that the proposed inverse approach is an effective tool for predicting the wind loads on super-tall buildings.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002048178
|
oai_dc
|
A Gaussian process-based response surface method for structural reliability analysis
|
A Gaussian process-based response surface method for structural reliability analysis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Guoshao Su(Guangxi University); Jianqing Jiang(Guangxi University); Bo Yu(Guangxi University); Yilong Xiao(Guangxi University)"
] |
A first-order moment method (FORM) reliability analysis is commonly used for structural stability analysis. It requires the values and partial derivatives of the performance to function with respect to the random variables for the design. These calculations can be cumbersome when the performance functions are implicit. A Gaussian process (GP)-based response surface is adopted in this study to approximate the limit state function. By using a trained GP model, a large number of values and partial derivatives of the performance functions can be obtained for conventional reliability analysis with a FORM, thereby reducing the number of stability analysis calculations. This dynamic renewed knowledge source can provide great assistance in improving the predictive capacity of GP during the iterative process, particularly from the view of machine learning. An iterative algorithm is therefore proposed to improve the precision of GP approximation around the design point by constantly adding new design points to the initial training set.
Examples are provided to illustrate the GP-based response surface for both structural and non-structural reliability analyses. The results show that the proposed approach is applicable to structural reliability analyses that involve implicit performance functions and structural response evaluations that entail timeconsuming finite element analyses.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002048179
|
oai_dc
|
A methodology for design of metallic dampers in retrofit of earthquake-damaged frame
|
A methodology for design of metallic dampers in retrofit of earthquake-damaged frame
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Chao Zhang(Guangzhou University); Yun Zhou(Guangzhou University); De H. Lu(Guangzhou University); Cong X. Wu(Guangzhou University); Da G. Weng(Tongji University)"
] |
A comprehensive methodology is proposed for design of metallic dampers in seismic retrofit of earthquake-damaged frame structures. It is assumed that the metallic dampers remain elastic and only provide stiffness during frequent earthquake (i.e., earthquake with a 63% probability of exceedance in 50- year service period), while in precautionary earthquake (i.e., earthquake with a 10% probability of exceedance in 50-year service period), the metallic dampers yield before the main frame and dissipate most of the seismic energy to either prevent or minimize structural damages. Therefore by converting multi-story frame to an equivalent single-degree-of-freedom system, the added stiffness provided by metallic dampers is designed to control elastic story drifts within code-based demand under frequent earthquake, and the added damping with the combination of added stiffness influences is obtained to control structural stress within performance-based target under precautionary earthquake. With the equivalent added damping ratio, the expected damping forces provided by metallic dampers can be calculated to carry out the configuration and design of metallic dampers along with supporting braces. Based on a detailed example for retrofit of an earthquake-damaged reinforced concrete frame by using metallic dampers, the proposed design procedure is demonstrated to be simple and practical, which can not only meet current China’s design codes but also be used in retrofit design of earthquake-damaged frame with metallic damper for reaching desirable performance objective.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002048175
|
oai_dc
|
Soil arching analysis in embankments on soft clays reinforced by stone columns
|
Soil arching analysis in embankments on soft clays reinforced by stone columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammed Y. Fattah(University of Technology, Baghdad); Bushra S. Zabar(University of Baghdad); Hanan A. Hassan(University of Al-Mustansiriya)"
] |
The present work investigates the behavior of the embankment models resting on soft soil reinforced with ordinary and stone columns encased with geogrid. Model tests were performed with different spacing distances between stone columns and two lengths to diameter ratios (L/d) of the stone columns, in addition to different embankment heights. A total number of 42 model tests were carried out on a soil with undrianed shear strength ≈10 kPa. The models consist of stone columns embankment at s/d equal to 2.5, 3 and 4 with L/d ratio equal 5 and 8. Three embankment heights; 200 mm, 250 mm and 300 mm were tested for both tests of ordinary (OSC) and geogrid encased stone columns (ESC). Three earth pressure cells were used to measure directly the vertical effective stress on column at the top of the middle stone column under the center line of embankment and on the edge stone column for all models while the third cell was placed at the base of embankment between two columns to measure the vertical effective stress in soft soil directly. The performance of stone columns embankments relies upon the ability of the granular embankment material to arch over the „gaps‟ between the stone columns spacing. The results showed that the ratio of the embankment height to the clear spacing between columns (h/s-d) is a key parameter. It is found that (h/s-d)< 1.2 and 1.4 for OSC and ESC, respectively; (h is the embankment height, s is the spacing between columns and d is the diameter of stone columns), no effect of arching is pronounced, the settlement at the surface of the embankment is very large, and the stress acting on the subsoil is virtually unmodified from the nominal overburden stress. When (h/s-d)≥2.2 for OSC and ESC respectively, full arching will occur and minimum stress on subsoil between stone columns will act, so the range of critical embankment height will be 1.2 (h/s- d) to 2.2 (h/s-d) for both OSC and ESC models.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002048180
|
oai_dc
|
Computation of 2-D mixed-mode stress intensity factors by Petrov-Galerkin natural element method
|
Computation of 2-D mixed-mode stress intensity factors by Petrov-Galerkin natural element method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"조진래(홍익대학교)"
] |
The mixed-mode stress intensity factors of 2-D angled cracks are evaluated by Petrov-Galerkin natural element (PG-NE) method in which Voronoi polygon-based Laplace interpolation functions and CSFE basis functions are used for the trial and test functions respectively. The interaction integral is implemented in a frame of PG-NE method in which the weighting function defined over a crack-tip integral domain is interpolated by Laplace interpolation functions. Two Cartesian coordinate systems are employed and the displacement, strains and stresses which are solved in the grid-oriented coordinate system are transformed to the other coordinate system aligned to the angled crack. The present method is validated through the numerical experiments with the angled edge and center cracks, and the numerical accuracy is examined with respect to the grid density, crack length and angle. Also, the stress intensity factors obtained by the present method are compared with other numerical methods and the exact solution. It is observed from the numerical results that the present method successfully and accurately evaluates the mixed-mode stress intensity factors of 2-D angled cracks for various crack lengths and crack angles.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002048181
|
oai_dc
|
Analysis of stiffened plates composed by different materials by the boundary element method
|
Analysis of stiffened plates composed by different materials by the boundary element method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Gabriela R. Fernandes(Federal University of Goiás); João R. Neto(Federal University of Goiás)"
] |
A formulation of the boundary element method (BEM) based on Kirchhoff’s hypothesis to analyse stiffened plates composed by beams and slabs with different materials is proposed. The stiffened plate is modelled by a zoned plate, where different values of thickness, Poisson ration and Young’s modulus can be defined for each sub-region. The proposed integral representations can be used to analyze the coupled stretching-bending problem, where the membrane effects are taken into account, or to analyze the bending and stretching problems separately. To solve the domain integrals of the integral representation of in-plane displacements, the beams and slabs domains are discretized into cells where the displacements have to be approximated. As the beams cells nodes are adopted coincident to the elements nodes, new independent values arise only in the slabs domain. Some numerical examples are presented and compared to a wellknown finite element code to show the accuracy of the proposed model.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002027593
|
oai_dc
|
Size-dependent bending analysis of FGM nano-sinusoidal plates resting on orthotropic elastic medium
|
Size-dependent bending analysis of FGM nano-sinusoidal plates resting on orthotropic elastic medium
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Reza Kolahchi(Islamic Azad University); Ali Mohammad Moniri Bidgoli(University of Tehran); Mohammad Mehdi Heydari(Islamic Azad University)"
] |
Bending analysis of functionally graded (FG) nano-plates is investigated in the present work based on a new sinusoidal shear deformation theory. The theory accounts for sinusoidal distribution of transverse shear stress, and satisfies the free transverse shear stress conditions on the top and bottom surfaces of the plate without using shear correction factor. The material properties of nano-plate are assumed to vary according to power law distribution of the volume fraction of the constituents. The size effects are considered based on Eringen's nonlocal theory. Governing equations are derived using energy method and Hamilton’s principle. The closed-form solutions of simply supported nano-plates are obtained and the results are compared with those of first-order shear deformation theory and higher-order shear deformation theory. The effects of different parameters such as nano-plate length and thickness, elastic foundation, orientation of foundation orthtotropy direction and nonlocal parameters are shown in dimensionless displacement of system. It can be found that with increasing nonlocal parameter, the dimensionless displacement of nanoplate increases.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002027599
|
oai_dc
|
Time-domain analyses of the layered soil by the modified scaled boundary finite element method
|
Time-domain analyses of the layered soil by the modified scaled boundary finite element method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shan Lu(Dalian University of Technology); Jun Liu(Dalian University of Technology); Gao Lin(Dalian University of Technology); Wenyuan Wang(Dalian University of Technology)"
] |
The dynamic response of two-dimensional unbounded domain on the rigid bedrock in the time domain is numerically obtained. It is realized by the modified scaled boundary finite element method (SBFEM) in which the original scaling center is replaced by a scaling line. The formulation bases on expanding dynamic stiffness by using the continued fraction approach. The solution converges rapidly over the whole time range along with the order of the continued fraction increases. In addition, the method is suitable for large scale systems. The numerical method is employed which is a combination of the time domain SBFEM for far field and the finite element method used for near field. By using the continued fraction solution and introducing auxiliary variables, the equation of motion of unbounded domain is built. Applying the spectral shifting technique, the virtual modes of motion equation are eliminated. Standard procedure in structural dynamic is directly applicable for time domain problem. Since the coefficient matrixes of equation are banded and symmetric, the equation can be solved efficiently by using the direct time domain integration method. Numerical examples demonstrate the increased robustness, accuracy and superiority of the proposed method. The suitability of proposed method for time domain simulations of complex systems is also demonstrated.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002027588
|
oai_dc
|
Theoretical study of UHPCC composite column behaviors under axial compression
|
Theoretical study of UHPCC composite column behaviors under axial compression
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xiang-Guo Wu(Harbin Institute of Technology); Ruofei Zou(University of Illinois); Xinyu Zhao(Harbin Engineering University); Qun Yu(Harbin Engineering University)"
] |
To improve the durability and service life of reinforced concrete column such as bridge piers, an advanced composite column made of Ultra High Performance Cementitious Composites (UHPCC) permanent form is proposed. Based on elasticity plasticity theory, axial compression behavior of the composite column was studied theoretically. The first circumferential cracking load and ultimate limit loading capacity are derived for the composite column. Short composite column compression tests and numerical simulations using FEM method were carried out to justify the theoretical formula. The effects of UHPCC tube thickness on the axial compression behavior were studied. Using the established theoretical model and numerical simulation, the large dimension composite columns are calculated and analyzed with different UHPCC tube thickness. These studies may provide a reference for advanced composite column design and application.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002027589
|
oai_dc
|
Torsion strength of single-box multi-cell concrete box girder subjected to combined action of shear and torsion
|
Torsion strength of single-box multi-cell concrete box girder subjected to combined action of shear and torsion
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Qian Wang(Dalian University of Technology); Wenliang Qiu(Dalian University of Technology); Zhe Zhang(Dalian University of Technology)"
] |
A model has been proposed that can predict the ultimate torsional strength of single-box multicell reinforced concrete box girder under combined loading of bending, shear and torsion. Compared with the single-cell box girder, this model takes the influence of inner webs on the distribution of shear flow into account. According to the softening truss theory and thin walled tube theory, a failure criterion is presented and a ultimate torsional strength calculating procedure is established for single-box multi-cell reinforced concrete box girder under combined actions, which considers the effect of tensile stress among the concrete cracks, Mohr stress compatibility and the softened constitutive law of concrete. In this paper the computer program is also compiled to speed up the calculation. The model has been validated by comparing the predicted and experimental members loaded under torsion combined with different ratios of bending and shear. The theoretical torsional strength was in good agreement with the experimental results.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002027597
|
oai_dc
|
Experimental and numerical analysis of RC structure with two leaf cavity wall subjected to shake table
|
Experimental and numerical analysis of RC structure with two leaf cavity wall subjected to shake table
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Onur Onat(Tunceli University); Paulo B. Lourenço(Minho University); Ali Koçak(Yıldız Technical University)"
] |
This paper presents finite element (FE) based pushover analysis of a reinforced concrete structure with a two-leaf cavity wall (TLCW) to estimate the performance level of this structure. In addition to this, an unreinforced masonry (URM) model was selected for comparison. Simulations and analyses of these structures were performed using the DIANA FE program. The mentioned structures were selected as two storeys and two bays. The dimensions of the structures were scaled 1:1.5 according to the Cauchy Froude similitude law. A shake table experiment was implemented on the reinforced concrete structure with the two-leaf cavity wall (TLCW) at the National Civil Engineering Laboratory (LNEC) in Lisbon, Portugal.
The model that simulates URM was not experimentally studied. This structure was modelled in the same manner as the TLCW. The purpose of this virtual model is to compare the respective performances. Two nonlinear analyses were performed and compared with the experimental test results. These analyses were carried out in two phases. The research addresses first the analysis of a structure with only reinforced concrete elements, and secondly the analysis of the same structure with reinforced concrete elements and infill walls. Both researches consider static loading and pushover analysis. The experimental pushover curve was plotted by the envelope of the experimental curve obtained on the basis of the shake table records. Crack patterns, failure modes and performance curves were plotted for both models. Finally, results were evaluated on the basis of the current regulation ASCE/SEI 41-06.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002027586
|
oai_dc
|
Ratcheting analysis of joined conical cylindrical shells
|
Ratcheting analysis of joined conical cylindrical shells
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jaskaran Singh(Indian Institute of Technology Delhi); B.P. Patel(Indian Institute of Technology Delhi)"
] |
The ratcheting and strain cyclic behaviour of joined conical-cylindrical shells under uniaxial strain controlled, uniaxial and multiaxial stress controlled cyclic loading are investigated in the paper. The elasto-plastic deformation of the structure is simulated using Chaboche non-linear kinematic hardening model in finite element package ANSYS 13.0. The stress-strain response near the joint of conical and cylindrical shell portions is discussed in detail. The effects of strain amplitude, mean stress, stress amplitude and temperature on ratcheting are investigated. Under strain symmetric cycling, the stress amplitude increases with the increase in imposed strain amplitude. Under imposed uniaxial/multiaxial stress cycling, ratcheting strain increases with the increasing mean/amplitude values of stress and temperature. The abrupt change in geometry at the joint results in local plastic deformation inducing large strain variations in the vicinity of the joint. The forcing frequency corresponding to peak axial ratcheting strain amplitude is significantly smaller than the frequency of first linear elastic axial vibration mode. The strains predicted from quasi static analysis are significantly smaller as compared to the peak strains from dynamic analysis.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002027595
|
oai_dc
|
Characteristic analysis on train-induced vibration responses of rigid-frame RC viaducts
|
Characteristic analysis on train-induced vibration responses of rigid-frame RC viaducts
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Liangming Sun(Wuhan University of Technology); Weiping Xie(Wuhan University of Technology); Xingwen He(Hokkaido University); Toshiro Hayashikawa(Hokkaido University)"
] |
A three-dimensional (3D) numerical analysis for the train-bridge interaction (TBI) system is actively developed in this study in order to investigate the vibration characteristics of rigid-frame reinforced concrete (RC) viaducts in both vertical and lateral directions respectively induced by running high-speed trains. An analytical model of the TBI system is established, in which the high-speed train is described by multi-DOFs vibration system and the rigid-frame RC viaduct is modeled with 3D beam elements. The simulated track irregularities are taken as system excitations. The numerical analytical algorithm is established based on the coupled vibration equations of the TBI system and verified through the detailed comparative study between the computation and testing. The vibration responses of the viaducts such as accelerations, displacements, reaction forces of pier bottoms as well as their amplitudes with train speeds are calculated in detail for both vertical and lateral directions, respectively. The frequency characteristics are further clarified through Fourier spectral analysis and 1/3 octave band spectral analysis. This study is intended to provide not only a simulation approach and evaluation tool for the train-induced vibrations upon the rigid-frame RC viaducts, but also instructive information on the vibration mitigation of the high-speed railway.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002027584
|
oai_dc
|
Generation of OC and MMA topology optimizer by using accelerating design variables
|
Generation of OC and MMA topology optimizer by using accelerating design variables
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"이동규(세종대학교); 신수미(부산대학교); Nguyen Hong Chan(세종대학교)"
] |
The goal of this study is to investigate computational convergence of optimal solutions, with respect to optimality criteria (OC) method and methods of moving asymptotes (MMA) as optimization model for non-linear programming of material topology optimization using an acceleration method that makes design variables rapidly move toward almost 0 and 1 values. 99 line topology optimization MATLAB code uses loop vectorization and memory pre-allocation as properly exploiting the strengths of MATLAB and moves portions of code out of the optimization loop so that they are only executed once as restructuring the program. Numerical examples of a simple beam under a lateral load and a given material density limitation provide merits and demerits of the present OC and MMA for 99 line topology optimization code of continuous material topology optimization design.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002027590
|
oai_dc
|
Case study on the effects of retrofitting on changing structural dynamic characteristics by microtremor measurements and finite element analysis
|
Case study on the effects of retrofitting on changing structural dynamic characteristics by microtremor measurements and finite element analysis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Ali Hadianfard(Shiraz University of Technology); Ramin Rabiee(Shiraz University of Technology); Azad Sarshad(Shiraz University of Technology)"
] |
Determination of dynamic parameters of a structure such as predominant frequency and damping ratio is one of the most important subjects in dynamics of structures. Different methods are used to determine predominant frequency. These methods are different in the cost, implement accessibility, accuracy, speed, applicability in different conditions, simplicity of calculations and required data accessibility. Calculation of damping ratio by using common experimental procedures is very difficult and costly, then it is assumed as a constant value in most calculations. Microtremor measurements and using spectral ratio method to determine the predominant frequency and damping ratio of structure is of interest in recent years. In this paper, as a case study, the effects of retrofitting on structural dynamic parameters of two four-story buildings by using microtremor measurements and also finite element analysis, is investigated.
The results of this study show that microtremor measurements can be utilized to assess the improvement of dynamic behavior of the retrofitted structure and the effectiveness of the method of retrofitting.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002027592
|
oai_dc
|
An efficient simulation method for reliability analysis of systems with expensive-to-evaluate performance functions
|
An efficient simulation method for reliability analysis of systems with expensive-to-evaluate performance functions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Bahman Farahmand Azar(University of Tabriz); Ali Hadidi(University of Tabriz); Amin Rafiee(University of Tabriz)"
] |
This paper proposes a novel reliability analysis method which computes reliability index, most probable point and probability of failure of uncertain systems more efficiently and accurately with compared to Monte Carlo, first-order reliability and response surface methods. It consists of Initial and Simulation steps. In Initial step, a number of space-filling designs are selected throughout the variables space, and then in Simulation step, performances of most of samples are estimated via interpolation using the space-filling designs, and only for a small number of the samples actual performance function is used for evaluation. In better words, doing so, we use a simple interpolation function called “reduced” function instead of the actual expensive-to-evaluate performance function of the system to evaluate most of samples. By using such a reduced function, total number of evaluations of actual performance is significantly reduced; hence, the method can be called Reduced Function Evaluations method. Reliabilities of six examples including series and parallel systems with multiple failure modes with truncated and/or non-truncated random variables are analyzed to demonstrate efficiency, accuracy and robustness of proposed method. In addition, a reliabilitybased design optimization algorithm is proposed and an example is solved to show its good performance.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001970318
|
oai_dc
|
Experimental and analytical investigations for behaviors of RC beams strengthened with tapered CFRPs
|
Experimental and analytical investigations for behaviors of RC beams strengthened with tapered CFRPs
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김나은(이화여자대학교); 김희선(이화여자대학교); 김영희(이화여자대학교)"
] |
This study investigates structural and mechanical behaviors of RC (Reinforced concrete) beams strengthened with tapered CFRP (Carbon fiber reinforced polymer) sheets having various configurations. Toward this goal, experiments are performed on RC beams strengthened with four layers of CFRP sheets and each layer of the CFRP is prepared to have different length. Experimental results show that tapered CFRPs have better strengthening effect than non-tapered CFRP sheets and maximum loads of the beams with tapered CFRPs are governed by the length of first CFRP layer rather than total length of CFRP layers. In addition, analyses are performed using FE (Finite Element) models including cohesive elements to predict debonding behaviors between FRP and concrete elements. The predicted results from the FE models show good agreement with the experimental results.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001970337
|
oai_dc
|
Post-heating behavior of concrete beams reinforced with fiber reinforced polymer bars
|
Post-heating behavior of concrete beams reinforced with fiber reinforced polymer bars
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad R. Irshidat(Jordan University of Science and Technology); Rami H. Haddad(Jordan University of Science and Technology); Hanadi Almahmoud(Jordan University of Science and Technology,)"
] |
The present paper investigates the post heating behavior of concrete beams reinforced with fiber reinforced polymer (FRP) bars, namely carbon fiber reinforced polymer (CFRP) bars and glass fiber reinforced polymer (GFRP) bars. Thirty rectangular concrete beams were prepared and cured for 28 days. Then, beams were either subjected (in duplicates) to elevated temperatures in the range (100 to 500oC) or left at room temperature before tested under four point loading for flexural response. Experimental results showed that beams, reinforced with CFRP and GFRP bars and subjected to temperatures below 300oC,showed better mechanical performance than that of corresponding ones with conventional reinforcing steel bars. The results also revealed that ultimate load capacity and stiffness pertaining to beams with FRP reinforcement decreased, yet their ultimate deflection and toughness increased with higher temperatures. All beams reinforced with FRP materials, except those post-heated to 500oC, failed by concrete crushing followed by tension failure of FRP bars.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001970326
|
oai_dc
|
Wave propagation in functionally graded plates with porosities using various higher-order shear deformation plate theories
|
Wave propagation in functionally graded plates with porosities using various higher-order shear deformation plate theories
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sihame Ait Yahia(University of Sidi Bel Abbes); Hassen Ait Atmane(University of Hassiba Ben Bouali); Mohammed Sid Ahmed Houari(University of Sidi Bel Abbes); Abdelouahed Tounsi(University of Sidi Bel Abbes)"
] |
In this work, various higher-order shear deformation plate theories for wave propagation in functionally graded plates are developed. Due to porosities, possibly occurring inside functionally graded materials (FGMs) during fabrication, it is therefore necessary to consider the wave propagation in plates having porosities in this study. The developed refined plate theories have fewer number of unknowns and equations of motion than the first-order shear deformation theory, but accounts for the transverse shear deformation effects without requiring shear correction factors. The rule of mixture is modified to describe and approximate material properties of the functionally graded plates with porosity phases. The governing equations of the wave propagation in the functionally graded plate are derived by employing the Hamilton’s principle. The analytic dispersion relation of the functionally graded plate is obtained by solving an eigenvalue problem. The effects of the volume fraction distributions and porosity volume fraction on wave propagation of functionally graded plate are discussed in detail. The results carried out can be used in the ultrasonic inspection techniques and structural health monitoring.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001970336
|
oai_dc
|
Effect of marble waste fines on rheological and hardened properties of sand concrete
|
Effect of marble waste fines on rheological and hardened properties of sand concrete
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"R. Djebien(University of 20 August 1955); M. Belachia(University of 20 August 1955); H. Hebhoub(University of 20 August 1955)"
] |
Faced with the growing needs of material resources and requirements of environmental protection for achieving sustainable development, it has become necessary to study and investigate all possibilities of exploring crushed and dune sand, reusing industrial wastes and by-product, and also applying new technologies including sand concrete which can replace the conventional concretes in certain structures to surmount the deficit on construction materials, conserve natural resources, lessen the burden of pollutants to protect the environment and reduce the consumption of energy sources.
This experimental study is a part of development and valorization of local materials project in Skikda region (East of Algeria). It aims at studying the effects of partial replacement of sand with marble waste as fines on several fresh and hardened properties of sand concrete in order to reuse these wastes in the concrete manufacturing, resolve the environmental problems caused by them and find another source of construction materials.
To achieve these objectives, an experimental program has been carried out; it was consisted to incorporate different percentages of marble waste fines (2, 4, 6, 8, 10 and 12%) in the formulations of sand concrete and study the development of several mechanical and rheological properties. We are also trying to find the optimal percentage of marble waste fine replaced in sand concrete that makes the strength of the concrete maximum.
Obtained results showed that marble waste fines improve the properties of sand concrete and can be used as an additive material in sand concrete formulation.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001970328
|
oai_dc
|
Electric potential redistribution due to time-dependent creep in thick-walled FGPM cylinder based on Mendelson method of successive approximation
|
Electric potential redistribution due to time-dependent creep in thick-walled FGPM cylinder based on Mendelson method of successive approximation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Kheirkhah(Islamic Azad University); A. Loghman(University of Kashan)"
] |
In this study, the stresses and electric potential redistributions of a cylinder made from functionally graded piezoelectric material (FGPM) are investigated. All the mechanical, thermal and piezoelectric properties are modeled as power-law distribution of volume fraction. Using the coupled electro-thermo-mechanical relations, strain-displacement relations, Maxwell and equilibrium equations are obtained including the time dependent creep strains. Creep strains are time, temperature and stress dependent, the closed form solution cannot be found for this constitutive differential equation. A semianalytical method in conjunction with the Mendelson method of successive approximation is therefore proposed for this analysis. Similar to the radial stress histories, electric potentials increase with time, because the latter is induced by the former during creep deformation of the cylinder, justifying industrial application of such a material as efficient actuators and sensors.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001970330
|
oai_dc
|
Symptom-based reliability analyses and performance assessment of corroded reinforced concrete structures
|
Symptom-based reliability analyses and performance assessment of corroded reinforced concrete structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hua-Peng Chen(University of Greenwich); Nan Xiao(Zhejiang University)"
] |
Reinforcement corrosion can cause serious safety deterioration to aging concrete structuresexposed in aggressive environments. This paper presents an approach for reliability analyses of deterioratingreinforced concrete structures affected by reinforcement corrosion on the basis of the representativesymptoms identified during the deterioration process. The concrete cracking growth and rebar bond strengthevolution due to reinforcement corrosion are chosen as key symptoms for the performance deterioration ofconcrete structures. The crack width at concrete cover surface largely depends on the corrosion penetrationof rebar due to the expansive rust layer at the bond interface generated by reinforcement corrosion. The bondstrength of rebar in the concrete correlates well with concrete crack width and decays steadily with crackwidth growth. The estimates of cracking development and bond strength deterioration are examined byexperimental data available from various sources, and then matched with symptom-based lifetime Weibullmodel. The symptom reliability and remaining useful life are predicted from the predictive lifetime Weibullmodel for deteriorating concrete structures. Finally, a numerical example is provided to demonstrate theapplicability of the proposed approach for forecasting the performance of concrete structures subject toreinforcement corrosion. The results show that the corrosion rate has significant impact on the reliabilityassociated with serviceability and load bearing capacity of reinforced concrete structures during their servicelife.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001970333
|
oai_dc
|
A simple shear deformation theory based on neutral surface position for functionally graded plates resting on Pasternak elastic foundations
|
A simple shear deformation theory based on neutral surface position for functionally graded plates resting on Pasternak elastic foundations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Abdeljalil Meksi(Université de Sidi Bel Abbes); Samir Benyoucef(Université de Sidi Bel Abbes); Mohammed Sid Ahmed Houari(Université de Mascaraa); Abdelouahed Tounsi(University of Sidi Bel Abbes)"
] |
In this work, a novel simple first-order shear deformation plate theory based on neutral surface position is developed for bending and free vibration analysis of functionally graded plates and supported by either Winkler or Pasternak elastic foundations. By dividing the transverse displacement into bending and shear parts, the number of unknowns and governing equations of the present theory is reduced, and hence, makes it simple to use. The governing equations are derived by employing the Hamilton’s principle and the physical neutral surface concept. There is no stretching–bending coupling effect in the neutral surface-based formulation, and consequently, the governing equations and boundary conditions of functionally graded plates based on neutral surface have the simple forms as those of isotropic plates. Numerical results of present theory are compared with results of the traditional first-order and the other higher-order theories reported in the literature. It can be concluded that the proposed theory is accurate and simple in solving the static bending and free vibration behaviors of functionally graded plates.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001970338
|
oai_dc
|
Evaluation of RPV according to alternative fracture toughness requirements
|
Evaluation of RPV according to alternative fracture toughness requirements
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"이신아(경희대학교); 이상환(경희대학교); 장윤석(경희대학교)"
] |
Recently, US NRC revised fracture toughness requirements as 10CFR50.61a to reduce the conservatism of 10CFR50.61. However, unlike previous studies relating to the initial regulation, structural integrity evaluations based on the alternative regulation are not sufficient. In the present study, PTS and P-T limit curve evaluations were carried out by using both regulations and resulting data were compared. With regard to the PTS evaluation, the results obtained from the alternative requirements were satisfied with the criterion whereas those obtained from the initial requirements did not meet the criterion. Also, with regard to the P-T limit curve evaluation, operating margin by 10CFR50.61a was greater than that by 10CFR50.61.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001970320
|
oai_dc
|
Flexural strengthening of continuous unbonded post-tensioned concrete beams with end-anchored CFRP laminates
|
Flexural strengthening of continuous unbonded post-tensioned concrete beams with end-anchored CFRP laminates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Saeed Ghasemi(Shahid Bahonar University); Ali A. Maghsoudi(University, Kerman); Habib A. Bengar(University of Mazandaran); Hamid R. Ronagh(University of Queensland)"
] |
This paper provides the results of an experimental investigation into the flexural behavior ofcontinuous two-span unbonded post-tensioned high strength concrete (HSC) beams, strengthened by endanchoredCFRP laminates of different configurations in the hogging region. Implementing two differentconfigurations of end-anchorage systems consisting of steel plates and bolts and carefully monitoring thedevelopment of strains throughout the load history using sufficiently large number of strain gauges, theresponse of beams including the observed crack propagations, beam deflection, modes of failure, capacityenhancement at service and ultimate and the amount of moment redistribution are measured, presented anddiscussed. The study is appropriate in the sense that it covers the more commonly occurring two span beamsinstead of the simply supported beams investigated by others. The experiments reconfirmed the finding ofothers that proper installation of composite strengthening system is most important in the quality of the bondwhich is essential for the internal transfer of forces. It was also found that for the tested two span continuousbeams, the capacity enhancement is more pronounced at the serviceability level than the ultimate. This is animportant finding as the design of these beams is mostly governed by the serviceability limit state signifyingthe appropriateness of the suggested strengthening method. The paper provides quantitative data on theamount of this capacity enhancement.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001970331
|
oai_dc
|
Edge wave propagation in an Electro-Magneto-Thermoelastic homogeneous plate subjected to stress
|
Edge wave propagation in an Electro-Magneto-Thermoelastic homogeneous plate subjected to stress
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Rajneesh Kakar(GNA University); Shikha Kakar(SBBS University)"
] |
This paper introduces the combined effect of electric field, magnetic field and thermal field on edge wave propagating in a homogeneous isotropic prestressed plate of finite thickness and infinite length. The dispersion relation of edge wave has been obtained by using classical dynamical theory of thermoelasticity. The phase velocity has been computed and shown graphically for various initial stress parameter, electro-magneto parameter, electric parameter and thermoelastic coupling parameter.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001970323
|
oai_dc
|
Alternative approach for the derivation of an eigenvalue problem for a Bernoulli-Euler beam carrying a single in-span elastic rod with a tip-mounted mass
|
Alternative approach for the derivation of an eigenvalue problem for a Bernoulli-Euler beam carrying a single in-span elastic rod with a tip-mounted mass
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Metin Gürgöze(Technical University of Istanbul); Serkan Zeren(Istanbul Arel University)"
] |
Many vibrating mechanical systems from the real life are modeled as combined dynamicalsystems consisting of beams to which spring-mass secondary systems are attached. In most of thepublications on this topic, masses of the helical springs are neglected. In a paper (Cha et al. 2008) publishedrecently, the eigencharacteristics of an arbitrary supported Bernoulli-Euler beam with multiple in-spanhelical spring-mass systems were determined via the solution of the established eigenvalue problem, wherethe springs were modeled as axially vibrating rods. In the present article, the authors used the assumedmodes method in the usual sense and obtained the equations of motion from Lagrange Equations and arrivedat a generalized eigenvalue problem after applying a Galerkin procedure. The aim of the present paper issimply to show that one can arrive at the corresponding generalized eigenvalue problem by following a quitedifferent way, namely, by using the so-called “characteristic force” method. Further, parametricinvestigations are carried out for two representative types of supporting conditions of the bending beam.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001970324
|
oai_dc
|
Robust design of liquid column vibration absorber in seismic vibration mitigation considering random system parameter
|
Robust design of liquid column vibration absorber in seismic vibration mitigation considering random system parameter
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Rama Debbarma(National Institute of Technology); Subrata Chakraborty(Indian Institute of Engineering Science and Technology)"
] |
The optimum design of liquid column dampers in seismic vibration control considering systemparameter uncertainty is usually performed by minimizing the unconditional response of a structure withoutany consideration to the variation of damper performance due to uncertainty. However, the system sodesigned may be sensitive to the variations of input system parameters due to uncertainty. The present studyis concerned with robust design optimization (RDO) of liquid column vibration absorber (LCVA)considering random system parameters characterizing the primary structure and ground motion model. TheRDO is obtained by minimizing the weighted sum of the mean value of the root mean square displacementof the primary structure as well as its standard deviation. A numerical study elucidates the importance of theRDO procedure for design of LCVA system by comparing the RDO results with the results obtained by theconventional stochastic structural optimization procedure and the unconditional response basedoptimization.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001856109
|
oai_dc
|
Use of vibration characteristics to predict the axial deformation of columns
|
Use of vibration characteristics to predict the axial deformation of columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H.N. Praveen Moragaspitiya(Queensland University of Technology); David P. Thambiratnam(Queensland University of Technology); Nimal J. Perera(Queensland University of Technology); Tommy H.T. Chan(Queensland University of Technology)"
] |
Vibration characteristics of columns are influenced by their axial loads. Numerous methods have been developed to quantify axial load and deformation in individual columns based on their natural frequencies. However, these methods cannot be applied to columns in a structural framing system as the natural frequency is a global parameter of the entire framing system. This paper presents an innovative method to quantify axial deformations of columns in a structural framing system using its vibration characteristics, incorporating the influence of load tributary areas, boundary conditions and load migration among the columns.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001856081
|
oai_dc
|
Determination of cable force based on the corrected numerical solution of cable vibration frequency equations
|
Determination of cable force based on the corrected numerical solution of cable vibration frequency equations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Danhui Dan(Tongji University); Yanyang Chen(Tongji University); Xingfei Yan(Shanghai Urban Construction Design and Research Institute)"
] |
The accurate determination of cable tension is important to the monitoring of the condition of a cable-stayed bridge. When applying a vibration-based formula to identify the tension of a real cable under sag, stiffness and boundary conditions, the resulting error must not be overlooked. In this work, by resolvingthe implicit frequency function of a real cable under the above conditions numerically, indirect methods of determining the cable force and a method to calculate the corresponding cable mode frequency are investigated. The error in the tension is studied by numerical simulation, and an empirical error correction formula is presented by fitting the relationship between the cable force error and cable parameters λ2 and ξ.
A case study on two real cables of the Shanghai Changjiang Bridge shows that employing the method proposed in this paper can increase the accuracy of the determined cable force and reduce the computing time relative to the time required for the finite element model.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001856126
|
oai_dc
|
New metal connectors developed to improve the shear strength of stone masonry walls
|
New metal connectors developed to improve the shear strength of stone masonry walls
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Turan Karabork(Aksaray University); Yilmaz Kocak(Ministry of Defense)"
] |
Stone masonry structures are widely used around the world, but they deteriorate easily, due to low shear strength capacity. Many techniques have been developed to increase the shear strength of stone masonry constructions. The aim of this experimental study was to investigate the performance of stone masonry walls strengthened by metal connectors as an alternative shear reinforcement technique. For this purpose, three new metal connector (clamp) types were developed. The shear strength of the walls was improved by applying these clamps to stone masonry walls. Ten stone masonry walls were structurally tested in diagonal compression. Various parameters regarding the in-plane behavior of strengthening stone masonry walls, including shear strength, failure modes, maximum drift, ductility, and shear modulus, were investigated. Experimentally obtained shear strengths were confirmed by empirical equations. The results of the study suggest that the new clamps developed for the study effectively increased the levels of shear strength and ductility of masonry constructions.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001856116
|
oai_dc
|
Experimental study on the compressive stress dependency of full scale low hardness lead rubber bearing
|
Experimental study on the compressive stress dependency of full scale low hardness lead rubber bearing
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"이홍표(한국수자력연구원 중앙연구원); 조명석(한국수자력연구원 중앙연구원); 김선용(한국수자력연구원); 박진영(유니슨이테크(주)); 장광석(유니슨이테크(주))"
] |
According to experimental studies made so far, design formula of shear characteristics suggested by ISO 22762 and JEAG 4614, representative design code for Lead Rubber Bearing(LRB) shows dependence caused by changes in compressive stress. Especially, in the case of atypical special structure, such as a nuclear power structure, placement of seismic isolation bearing is more limited compared to that of existing structures and design compressive stress is various in sizes. As a result, there is a difference between design factor and real behavior with regards to shear characteristics of base isolation device, depending on compressive stress. In this study, a full-scale low hardness device of LRB, representative base isolation device was manufactured, analyzed, and then evaluated through an experiment on shear characteristics related to various compressive stresses. With design compressive stress of the full-scale LRB (13MPa) being a basis, changes in shear characteristics were analyzed for compressive stress of 5 MPa, 10 MPa, 13 MPa, 15 MPa, and 20 MPa based on characteristics test specified by ISO 22762:2010 and based on the test result, a regression analysis was made to offer an empirical formula. With application of proposed design formula which reflected the existing design formula and empirical formula, trend of horizontal characteristics was analyzed.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001856070
|
oai_dc
|
Response modification factor of the frames braced with reduced yielding segment BRB
|
Response modification factor of the frames braced with reduced yielding segment BRB
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Nader Fanaie(K.N.Toosi University of Technology); Ebrahim Afsar Dizaj(K.N.Toosi University of Technology)"
] |
In this paper, overstrength, ductility and response modification factors are calculated for frames braced with a different type of buckling restrained braces, called reduced yielding segment BRB (Buckling Restrained Brace) in which the length of its yielding part is reduced and placed in one end of the brace element in comparison with conventional BRBs.Forthermore,these factors are calculated for ordinary BRBF and the results are compared. In this regard incremental dynamic analysis (IDA) method is used for studying 17 records of the most known earthquakes happened in the world. To do that, the considered buildings have different stories and two bracing configurations: diagonal and inverted V chevron, the most ordinary configurations of BRBFs. Static pushover analysis, nonlinear incremental dynamic analysis and linear dynamic analysis have been performed using OpenSees software. Considering the results, it can be seen that, overstrength, ductility and response modification factors of this type of BRBF(Buckling Restrained Braced Frame) is greater than those of conventional types and it shows better seismic performance and also eliminates some of conventional BRBF’s disadvantages such as low post-yield stiffness.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001856075
|
oai_dc
|
Krylov subspace-based model order reduction for Campbell diagram analysis of large-scale rotordynamic systems
|
Krylov subspace-based model order reduction for Campbell diagram analysis of large-scale rotordynamic systems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"한정삼(안동대학교)"
] |
This paper focuses on a model order reduction (MOR) for large-scale rotordynamic systems by using finite element discretization. Typical rotor-bearing systems consist of a rotor, built-on parts, and a support system. These systems require careful consideration in their dynamic analysis modeling because they include unsymmetrical stiffness, localized nonproportional damping, and frequency-dependent gyroscopic effects. Because of this complex geometry, the finite element model under consideration may have a very large number of degrees of freedom. Thus, the repeated dynamic analyses used to investigate the critical speeds, stability, and unbalanced response are computationally very expensive to complete within a practical design cycle. In this study, we demonstrate that a Krylov subspace-based MOR via moment matching significantly speeds up the rotordynamic analyses needed to check the whirling frequencies and critical speeds of large rotor systems. This approach is very efficient, because it is possible to repeat thedynamic simulation with the help of a reduced system by changing the operating rotational speed, which canbe preserved as a parameter in the process of model reduction. Two examples of rotordynamic systems show that the suggested MOR provides a significant reduction in computational cost for a Campbell diagram analysis, while maintaining accuracy comparable to that of the original systems.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001856106
|
oai_dc
|
Dynamic behavior of a functionally graded plate resting on Winkler elastic foundation and in contact with fluid
|
Dynamic behavior of a functionally graded plate resting on Winkler elastic foundation and in contact with fluid
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ali A. Shafiee(Shiraz University); Farhang Daneshmand(McGill University); Ehsan Askari(Macquarie University); Mojtaba Mahzoon(Shiraz University)"
] |
A semi-analytical method is developed to consider free vibrations of a functionally graded elastic plate resting on Winkler elastic foundation and in contact with a quiescent fluid. Material properties are assumed to be graded distribution along the thickness direction according to a power-law in terms of the volume fractions of the constituents. The fluid is considered to be incompressible and inviscid. In the analysis, the effect of an in-plane force in the plate due to the weight of the fluid is taken into account. By satisfying the compatibility conditions along the interface of fluid and plate, the fluid-structure interaction is taken into account and natural frequencies and mode shapes of the coupled system are acquired by employing energy methods. The results obtained from the present approach are verified by those from a finite element analysis. Besides, the effects of volume fractions of functionally graded materials, Winkler foundation stiffness and in-plane forces on the dynamic of plate are elucidated.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001856122
|
oai_dc
|
Movement identification model of port container crane based on structural health monitoring system
|
Movement identification model of port container crane based on structural health monitoring system
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mosbeh R. Kaloop(Kunsan National University); Mohamed A. Sayed(Kunsan National University); 김두기(군산대학교); 김은성(한국유지관리(주))"
] |
This study presents a steel container crane movement analysis and assessment based onstructural health monitoring (SHM). The accelerometers are used to monitor the dynamic crane behavior anda 3-D finite element model (FEM) was designed to express the static displacement of the crane under thedifferent load cases. The multi-input single-output nonlinear autoregressive neural network with externalinput (NNARX) model is used to identify the crane dynamic displacements. The FEM analysis and theidentification model are used to investigate the safety and the vibration state of the crane in both time andfrequency domains. Moreover, the SHM system is used based on the FEM analysis to assess the cranebehavior. The analysis results indicate that: (1) the mean relative dynamic displacement can reveal therelative static movement of structures under environmental load; (2) the environmental load conditionsclearly affect the crane deformations in different load cases; (3) the crane deformations are shown within thesafe limits under different loads.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002017795
|
oai_dc
|
Efficient methods for integrating weight function: a comparative analysis
|
Efficient methods for integrating weight function: a comparative analysis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Gaurav Dubey(Institute of Technology); Shailendra Kumar(Guru Ghasidas Vishwavidyalaya)"
] |
This paper introduces Romberg-Richardson’s method as one of the numerical integration tools for computation of stress intensity factor in a pre-cracked specimen subjected to a complex stress field across the crack faces. Also, the computation of stress intensity factor for various stress fields using existing three methods: average stress over interval method, piecewise linear stress method, piecewise quadratic method are modified by using Richardson extrapolation method. The direct integration method is used as reference for constant and linear stress distribution across the crack faces while Gauss-Chebyshev method is used as reference for nonlinear distribution of stress across the crack faces in order to obtain the stress intensity factor. It is found that modified methods (average stress over intervals-Richardson method, piecewise linear stress-Richardson method, piecewise quadratic-Richardson method) yield more accurate results after a few numbers of iterations than those obtained using these methods in their original form.
Romberg-Richardson’s method is proven to be more efficient and accurate than Gauss-Chebyshev method for complex stress field.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002017791
|
oai_dc
|
Equivalent moment of inertia of a truss bridge with steelconcrete composite deck
|
Equivalent moment of inertia of a truss bridge with steelconcrete composite deck
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wojciech Siekierski(Poznań University of Technology)"
] |
Flexural stiffness of bridge spans has become even more important parameter since Eurocode 1 introduced for railway bridges the serviceability limit state of resonance. For simply supported bridge spans it relies, in general, on accurate assessment of span moment of inertia that governs span flexural stiffness.
The paper presents three methods of estimation of the equivalent moment of inertia for such spans: experimental, analytical and numerical. Test loading of the twin truss bridge spans and test results are presented. Recorded displacements and the method of least squares are used to find an “experimental” moment of inertia. Then it is computed according to the analytical method that accounts for joint action of truss girders and composite deck as well as limited span shear stiffness provided by diagonal bracing.
Finally a 3D model of finite element method is created to assess the moment of inertia. Discussion of results is given. The comparative analysis proves efficiency of the analytical method.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002017794
|
oai_dc
|
Effects of rotary inertia shear deformation and non-homogeneity on frequencies of beam
|
Effects of rotary inertia shear deformation and non-homogeneity on frequencies of beam
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mehmet Avcar(Suleyman Demirel University)"
] |
In the present study, separate and combined effects of rotary inertia, shear deformation and material non-homogeneity (MNH) on the values of natural frequencies of the simply supported beam are examined. MNH is characterized considering the parabolic variations of the Young's modulus and density along the thickness direction of the beam, while the value of Poisson’s ratio is assumed to remain constant. At first, the equation of the motion including the effects of the rotary inertia, shear deformation and MNH is provided. Then the solutions including frequencies of the first three modes for various combinations of the parameters of the MNH, depth to length ratios, and shear corrections factors are reported. To show the accuracy of the present results, two comparisons are carried out and good agreements are found.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002017785
|
oai_dc
|
Simultaneous identification of stiffness and damping based on derivatives of eigen-parameters
|
Simultaneous identification of stiffness and damping based on derivatives of eigen-parameters
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H. Li(Sun Yat-sen University); Z. R. Lu(Sun Yat-sen University); J.K. Liu(Sun Yat-sen University)"
] |
A method based on derivatives of eigen-parameters is presented for damage detection in discrete systems with dampers. The damage is simulated by decrease on the stiffness coefficient and increase of the damping coefficient. In the forward analysis, the derivatives of eigen-parameters are derived for the discrete system. In the inverse analysis, a derivative of eigen-parameters based model updating approach is used to identify damages in frequency domain. Two numerical examples are investigated to illustrate efficiency and accuracy of the proposed method. Studies in this paper indicate that the proposed method is efficient and robust for both single and multiple damages and is insensitive to measurement noise. And satisfactory identified results can be obtained from few numbers of iterations.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002017787
|
oai_dc
|
New enhanced higher order free vibration analysis of thick truncated conical sandwich shells with flexible cores
|
New enhanced higher order free vibration analysis of thick truncated conical sandwich shells with flexible cores
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Keramat Malekzadeh Fard(MalekAshtar University of Technology); Mostafa Livani(MalekAshtar University of Technology)"
] |
This paper dealt the free vibration analysis of thick truncated conical composite sandwich shells with transversely flexible cores and simply supported boundary conditions based on a new improved and enhanced higher order sandwich shell theory. Geometries were used in the present work for the consideration of different radii curvatures of the face sheets and the core was unique. The coupled governing partial differential equations were derived by the Hamilton's principle. The in-plane circumferential and axial stresses of the core were considered in the new enhanced model. The first order shear deformation theory was used for the inner and outer composite face sheets and for the core, a polynomial description of the displacement fields was assumed based on the second Frostig’s model. The effects of types of boundary conditions, conical angles, length to radius ratio, core to shell thickness ratio and core radius to shell thickness ratio on the free vibration analysis of truncated conical composite sandwich shells were also studied. Numerical results are presented and compared with the latest results found in literature. Also, the results were validated with those derived by ABAQUS FE code.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002017788
|
oai_dc
|
A new nonlocal hyperbolic shear deformation theory for nanobeams embedded in an elastic medium
|
A new nonlocal hyperbolic shear deformation theory for nanobeams embedded in an elastic medium
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Khadidja Aissani(Université de Sidi Bel Abbes); Abdelouahed Tounsi(Université de Sidi Bel Abbes); Mohamed Bachir Bouiadjra(Université de Sidi Bel Abbes); Mama Ahouel(University of Sidi Bel Abbes)"
] |
This work presents a new nonlocal hyperbolic shear deformation beam theory for the static, buckling and vibration of nanoscale-beams embedded in an elastic medium. The present model is able to capture both the nonlocal parameter and the shear deformation effect without employing shear correction factor. The nonlocal parameter accounts for the small size effects when dealing with nanosize structures such as nanobeams. Based on the nonlocal differential constitutive relations of Eringen, the equations of motion of the nanoscale-beam are obtained using Hamilton’s principle. The effect of the surrounding elastic medium on the deflections, critical buckling loads and frequencies of the nanobeam is investigated. Both Winklertype and Pasternak-type foundation models are used to simulate the interaction of the nanobeam with the surrounding elastic medium. Analytical solutions are presented for a simply supported nanoscale-beam, and the obtained results compare well with those predicted by the other nonlocal theories available in literature.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002017790
|
oai_dc
|
Vibration analysis of free-fixed hyperbolic cooling tower shells
|
Vibration analysis of free-fixed hyperbolic cooling tower shells
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"강재훈(중앙대학교)"
] |
A three-dimensional (3-D) method of analysis is presented for determining the free vibration frequencies of hyperboloidal shells free at the top edge and clamped at the bottom edge like a hyperboloidal cooling tower by the Ritz method based upon the circular cylindrical coordinate system instead of related 3- D shell coordinates which are normal and tangent to the shell midsurface. The Legendre polynomials are used as admissible displacements. Convergence to four-digit exactitude is demonstrated. Natural frequencies from the present 3-D analysis are also compared with those of straight beams with circular cross section, complete (not truncated) conical shells, and circular cylindrical shells as special cases of hyperboloidal shells from the classical beam theory, 2-D thin shell theory, and other 3-D methods.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002017796
|
oai_dc
|
Helical gear multi-contact tooth mesh load analysis with flexible bearings and shafts
|
Helical gear multi-contact tooth mesh load analysis with flexible bearings and shafts
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Chengwu Li(Chongqing University); Yulin He(Chongqing University); Xianxiong Ning(Chongqing University)"
] |
A multi-contact tooth meshing model for helical gear pairs considering bearing and shaft deformations is proposed. First, to easily incorporate into the system model, the complicated Harris’ bearing force-displacement relationship is simplified applying a linear least square curve fit. Then, effects of shaft and bearing flexibilities on the helical gear meshing behavior are implemented through transformation matrices which contain the helical gear orientation and spatial displacement under loads. Finally, true contact lines between conjugated teeth are approximated applying a modified meshing equation that includes the influence of tooth flank displacement on the tooth contact induced by shaft and bearing displacements.
Based on the model, the bearing’s force-displacement relation is examined, and the effects of shaft deformation and external load on the multi-contact tooth mesh load distribution are also analyzed. The advantage of this work is, unlike previous works to search true contact lines through time-consuming iterative strategy, to determine true contact lines between conjugated teeth directly with presentation of deformations of bearings and shafts.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002017789
|
oai_dc
|
Standardization of composite connections for trapezoid web profiled steel sections
|
Standardization of composite connections for trapezoid web profiled steel sections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Saggaff(Sriwijaya University); M.M. Tahir(Universiti Teknologi Malaysia); A. Sulaiman(Universiti Teknologi Malaysia); S.P. Ngian(Universiti Teknologi Malaysia); J. Mirza(Universiti Teknologi Malaysia)"
] |
Connections are usually designed either as pinned usually associated with simple construction or rigid normally is associated with continuous construction. However, the actual behaviour falls in between these two extreme cases. The use of partial strength or semi-rigid connections has been encouraged by Euro-code 3 and studies on semi-continuous construction have shown substantial savings in steel weight of the overall construction. Composite connections are proposed in this paper as partial or full strength connections. Standardized connection tables are developed based on checking on all possible failure modes as suggested by “component method” for beam-to-column composite connection on major axis. Four experimental tests were carried out to validate the proposed standardised connection table. The test results showed good agreement between experimental and theoretical values with the ratio in the range between 1.06 to 1.50. All tested specimens of the composite connections showed ductile type of failure with the formation of cracks occurred on concrete slab at maximum load. No failure occurred on the Trapezoidal Web Profiled Steel Section as beam and on the British Section as column.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002017786
|
oai_dc
|
Analyse of the behavior of functionally graded beams based on neutral surface position
|
Analyse of the behavior of functionally graded beams based on neutral surface position
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lazreg Hadji(Université Ibn Khaldoun); El Abbes Adda Bedia(Université de Sidi Bel Abbes)"
] |
In this paper, a simple n-order refined theory based on neutral surface position is developed for bending and frees vibration analyses of functionally graded beams. The present theory is variationally consistent, uses the n-order polynomial term to represent the displacement field, does not require shear correction factor, and gives rise to transverse shear stress variation such that the transverse shear stresses vary parabolically across the thickness satisfying shear stress free surface conditions. The governing equations are derived by employing the Hamilton’s principle and the physical neutral surface concept. The accuracy of the present solutions is verified by comparing the obtained results with available published ones.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002017792
|
oai_dc
|
A family of dissipative structure-dependent integration methods
|
A family of dissipative structure-dependent integration methods
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shuenn-Yih Chang(National Taipei University of Technology); Tsui-Huang Wu(National Taipei University of Technology); Ngoc-Cuong Tran(Ngoc-Cuong Tran)"
] |
A new family of structure-dependent integration methods is developed to enhance with desired numerical damping. This family method preserves the most important advantage of the structure-dependent integration method, which can integrate unconditional stability and explicit formulation together, and thus it is very computationally efficient. In addition, its numerical damping can be continuously controlled with a parameter. Consequently, it is best suited to solving an inertia-type problem, where the unimportant high frequency responses can be suppressed or even eliminated by the favorable numerical damping while the low frequency modes can be very accurately integrated.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002017793
|
oai_dc
|
Study of dynamic mechanical behavior of aluminum 7075-T6 with respect to diameters and L/D ratios using Split Hopkinson Pressure Bar (SHPB)
|
Study of dynamic mechanical behavior of aluminum 7075-T6 with respect to diameters and L/D ratios using Split Hopkinson Pressure Bar (SHPB)
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Eunhye Kim(Colorado School of Mines); Hossein Changani(University of Utah)"
] |
The aluminum 7075-T6 is known as an alloy widely used in aircraft structural applications, which does not exhibit strain rate sensitivity during dynamic compressive tests. Despite mechanical importance of the material, there is not enough attention to determine appropriate sample dimensions such as a sample diameter relative to the device bar diameter and sample length to diameter (L/D) ratio for dynamic tests and how these two parameters can change mechanical behaviors of the sample under dynamic loading condition. In this study, various samples which have different diameters of 31.8, 25.4, 15.9, and 9.5 mm and sample L/D ratios of 2.0, 1.5, 1.0, 0.5, and 0.25 were tested using Split Hopkinson Pressure Bar (SHPB), as this testing device is proper to characterize mechanical behaviors of solid materials at high strain rates. The mechanical behavior of this alloy was examined under ~200–5,500 s-1 dynamic strain rate. Aluminum samples of 2.0, 1.5 and 1.0 of L/D ratios were well fitted into the stress-strain curve, Madison and Green’s diagram, regardless of the sample diameters. Also, the 0.5 and 0.25 L/D ratio samples having the diameter of 31.8 and 25.4 mm followed the stress-strain curve. As results, larger samples (31.8 and 25.4 mm) in diameters followed the stress-strain curve regardless of the L/D ratios, whereas the 0.5 and 0.25 L/D ratios of small diameter sample (15.9 and 9.5 mm) did not follow the stress-strain diagram but significantly deviate from the diagram. Our results indicate that the L/D ratio is important determinant in stress-strain responses under the SHPB test when the sample diameter is small relative to the test bar diameter (31.8 mm), but when sample diameter is close to the bar diameter, L/D ratio does not significantly affect the stress-strain responses. This suggests that the areal mismatch (non-contact area of the testing bar) between the sample and the bar can misrepresent mechanical behaviors of the aluminum 7075-T6 at the dynamic loading condition.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002079551
|
oai_dc
|
Examination of non-homogeneity and lamination scheme effects on deflections and stresses of laminated composite plates
|
Examination of non-homogeneity and lamination scheme effects on deflections and stresses of laminated composite plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ferruh Turan(Ondokuz Mayıs University); Zihni Zerin(Ondokuz Mayis University); Muhammed Fatih Başoğlu(Ondokuz Mayıs University)"
] |
In this study, a convenient formulation for the bending of laminated composite plates that hold non-homogeneous properties is examined. The constitutive equations of first order shear deformation plate theory are obtained using Hamilton Principle. The effect of non-homogeneity, lamination schemes and aspect ratio on the deflections and stresses is analysed. It is understood from the study that economical and optimum designs for laminated composite plates can be achieved by changing lamination scheme and by considering non-homogeneity response of composite plate.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002079555
|
oai_dc
|
Seismic behavior of T-shaped steel reinforced high strength concrete short-limb shear walls under low cyclic reversed loading
|
Seismic behavior of T-shaped steel reinforced high strength concrete short-limb shear walls under low cyclic reversed loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zongping Chen(Guangxi University); Jinjun Xu(Guangxi University); Yuliang Chen(Guangxi University); Yisheng Su1(Guangxi University)"
] |
This paper presents an experimental study of six steel reinforced high strength concrete T-shaped short-limb shear walls configured with T-shaped steel truss under low cyclic reversed loading. Considering different categories of ratios of wall limb height to thickness, shear/span ratios, axial compression ratios and stirrup reinforcement ratios were selected to investigate the seismic behavior (strength, stiffness, energy dissipation capacity, ductility and deformation characteristics) of all the specimens. Two different failure modes were observed during the tests, including the flexural-shear failure for specimens with large shear/span ratio and the shear-diagonal compressive failure for specimens with small shear/span ratio. On the basis of requirement of Chinese seismic code, the deformation performance for all the specimens could not meet the level of ‘three’ fortification goals. Recommendations for improving the structural deformation capacity of T-shaped steel reinforced high strength concrete short-limb shear wall were proposed. Based on the experimental observations, the mechanical analysis models for concrete cracking strength and shear strength were derived using the equivalence principle and superposition theory, respectively. As a result, the proposed method in this paper was verified by the test results, and the experimental results agreed well with the proposed model.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002079559
|
oai_dc
|
Teaching learning-based optimization for design of cantilever retaining walls
|
Teaching learning-based optimization for design of cantilever retaining walls
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Rasim Temür(Istanbul University); Gebrail Bekdaş(Istanbul University)"
] |
A methodology based on Teaching Learning-Based Optimization (TLBO) algorithm is proposed for optimum design of reinforced concrete retaining walls. The objective function is to minimize total material cost including concrete and steel per unit length of the retaining walls. The requirements of the American Concrete Institute (ACI 318-05-Building code requirements for structural concrete) are considered for reinforced concrete (RC) design. During the optimization process, totally twenty-nine design constraints composed from stability, flexural moment capacity, shear strength capacity and RC design requirements such as minimum and maximum reinforcement ratio, development length of reinforcement are checked. Comparing to other nature-inspired algorithm, TLBO is a simple algorithm without parameters entered by users and self-adjusting ranges without intervention of users. In numerical examples, a retaining wall taken from the documented researches is optimized and the several effects (backfill slope angle, internal friction angle of retaining soil and surcharge load) on the optimum results are also investigated in the study. As a conclusion, TLBO based methods are feasible.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002079553
|
oai_dc
|
Experimental study of masonry infill reinforced concrete frames with and without corner openings
|
Experimental study of masonry infill reinforced concrete frames with and without corner openings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hamid Reza Khoshnoud(Islamic Azad University); Kadir Marsono(University of Technology of Malaysia)"
] |
Reinforced concrete frame buildings with masonry infill walls are one of the most popular structural systems in the world. In most cases, the effects of masonry infill walls are not considered in structural models. The results of earthquakes show that infill walls have a significant effect on the seismic response of buildings. In some cases, the buildings collapsed as a result of the formation of a soft story. This study developed a simple method, called corner opening, by replacing the corner of infill walls with a very flexible material to enhance the structural behavior of walls. To evaluate the proposed method a series of experiments were conducted on masonry infill wall and reinforced concrete frames with and without corner openings. Two 1:4 scale masonry infill walls with and without corner openings were tested under diagonal tension or shear strength and two RC frames with full infill walls and with corner opening infill walls were tested under monotonic horizontal loading up to a drift level of 2.5%. The experimental results revealed that the proposed method reduced the strength of infill wall specimens but considerably enhanced the ductility of infill wall specimens in the diagonal tension test. Moreover, the corner opening in infill walls prevented the slid shear failure of the infill wall in RC frames with infill walls.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002079552
|
oai_dc
|
Thermo-mechanical postbuckling of symmetric S-FGM plates resting on Pasternak elastic foundations using hyperbolic shear deformation theory
|
Thermo-mechanical postbuckling of symmetric S-FGM plates resting on Pasternak elastic foundations using hyperbolic shear deformation theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Abdelouahed Tounsi(University of Sidi Bel Abbes); Abdelbaki Chikh(University of Sidi Bel Abbes); Houari Heireche(University of Sidi Bel Abbes); Mohammed Sid Ahmed Houari(University of Sidi Bel Abbes); E.A. Adda Bedia(University of Sidi Bel Abbes); Ahmed Bakora(University of Sidi Bel Abbes)"
] |
In this work, an analytical formulation based on both hyperbolic shear deformation theory and stress function, is presented to study the nonlinear post-buckling response of symmetric functionally graded plates supported by elastic foundations and subjected to in-plane compressive, thermal and thermo-mechanical loads. Elastic properties of material are based on sigmoid power law and varying across the thickness of the plate (S-FGM). In the present formulation, Von Karman nonlinearity and initial geometrical imperfection of plate are also taken into account. By utilizing Galerkin procedure, closed-form expressions of buckling loads and post-buckling equilibrium paths for simply supported plates are obtained. The effects of different parameters such as material and geometrical characteristics, temperature, boundary conditions, foundation stiffness and imperfection on the mechanical and thermal buckling and post-buckling loading capacity of the S-FGM plates are investigated.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002079554
|
oai_dc
|
Shear strength estimation of RC deep beams using the ANN and strut-and-tie approaches
|
Shear strength estimation of RC deep beams using the ANN and strut-and-tie approaches
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Gunnur Yavuz(Selcuk University)"
] |
Reinforced concrete (RC) deep beams are structural members that predominantly fail in shear. Therefore, determining the shear strength of these types of beams is very important. The strut-and-tie method is commonly used to design deep beams, and this method has been adopted in many building codes (ACI318-14, Eurocode 2-2004, CSA A23.3-2004). In this study, the efficiency of artificial neural networks (ANNs) in predicting the shear strength of RC deep beams is investigated as a different approach to the strut-and-tie method. An ANN model was developed using experimental data for 214 normal and high-strength concrete deep beams from an existing literature database. Seven different input parameters affecting the shear strength of the RC deep beams were selected to create the ANN structure. Each parameter was arranged as an input vector and a corresponding output vector that includes the shear strength of the RC deep beam. The ANN model was trained and tested using a multi-layered back-propagation method. The most convenient ANN algorithm was determined as trainGDX. Additionally, the results in the existing literature and the accuracy of the strut-and-tie model in ACI318-14 in predicting the shear strength of the RC deep beams were investigated using the same test data. The study shows that the ANN model provides acceptable predictions of the ultimate shear strength of RC deep beams (maximum R2≈0.97). Additionally, the ANN model is shown to provide more accurate predictions of the shear capacity than all the other computed methods in this study. The ACI318-14-STM method was very conservative, as expected. Moreover, the study shows that the proposed ANN model predicts the shear strengths of RC deep beams better than does the strut-and-tie model approaches.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002079556
|
oai_dc
|
Influence of microstructure, heterogeneity and internal friction on SH waves propagation in a viscoelastic layer overlying a couple stress substrate
|
Influence of microstructure, heterogeneity and internal friction on SH waves propagation in a viscoelastic layer overlying a couple stress substrate
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Vikas Sharma(Lovely Professional University); Satish Kumar(Thapar University)"
] |
In this paper, we have investigated shear horizontal wave propagation in a layered structure, consisting of granular macromorphic rock (Dionysos Marble) substrate underlying a viscoelastic layer of finite thickness. SH waves characteristics are affected by the material properties of both substrate and the coating. The effects of microstructural parameter “characteristic length” of the substrate, along with heterogeneity, internal friction and thickness of viscoelastic layer are studied on the dispersion curves. Dispersion equation for SH wave is derived. Real and damping phase velocities of SH waves are studied against dimensionless wave number, for different combinations of various parameters involved in the problem.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002079558
|
oai_dc
|
Edge stresses analysis in thick composite panels subjected to axial loading using layerwise formulation
|
Edge stresses analysis in thick composite panels subjected to axial loading using layerwise formulation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Isa Ahmadi(University of Zanjan)"
] |
Based on a reduced displacement field, a layer-wise (LW) formulation is developed for analysis of thick shell panels which is subjected to axial tension. Employing the principle of minimum total potential energy, the local governing equations of thick panel which is subjected to axial extension are obtained. An analytical method is developed for solution of the governing equations for various edge conditions. The governing equations are solved for free and simply supported edge conditions. The interlaminar stresses in the panel are investigated by means of Hooke's law and also by means of integration of the equilibrium equations of elasticity. Dependency of the result upon the number of numerical layers in the layerwise theory (LWT) is studied. The accuracy of the numerical results is validated by comparison with the results of the finite element method and with other available results in the open literature and good agreement is seen between the results. Numerical results are then presented for the distribution of interlaminar normal and shear stresses within the symmetric and un-symmetric cross-ply thick panels with free and simply supported boundaries. The effects of the geometrical parameters such as radius to thickness and width to thickness ratio are investigated on the distribution of the interlaminar stresses in thick panels.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002079557
|
oai_dc
|
Numerical modeless of the damage, around inclusion in the orthopedic cement PMMA
|
Numerical modeless of the damage, around inclusion in the orthopedic cement PMMA
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Cherfi Mohamed(University of Sidi Bel Abbes); Benbarek Smail(University of Sidi Bel Abbes); Bachir Bouiadjra(University of Sidi Bel Abbes); B. Serier(University of Sidi Bel Abbes)"
] |
In orthopedic surgery and more especially in total arthroplastie of hip, the fixing of the implants generally takes place essentially by means of constituted surgical polymer cement. The damage of this materiel led to the fatal rupture and thus loosening of the prosthesis in total hip, the effect of over loading as the case of tripping of the patient during walking is one of the parameters that led to the damage of this binder. From this phenomenon we supposed that a remain of bone is included in the cement implantation. The object of this work is to study the effect of this bony inclusion in the zones where the outside conditions (loads and geometric shapes) can provoke the fracture of the cement and therefore the aseptic lousing of the prosthesis. In this study it was assumed the presence of two bones –type inclusions in this material, one after we analyzed the effect of interaction between these two inclusions damage of damage to this material. One have modeled the damage in the cement around this bone inclusion and estimate the crack length from the damaged cement zone in the acetabulum using the finite element method, for every position of the implant under the extreme effort undergone by the prosthesis. We noted that the most intense stress position is around the sharp corner of the bone fragment and the higher level of damage leads directly the fracture of the total prosthesis of the hip.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002079550
|
oai_dc
|
A response surface method based on sub-region of interest for structural reliability analysis
|
A response surface method based on sub-region of interest for structural reliability analysis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Weitao Zhao(Shenyang Aerospace University); Xueyan Shi (Shenyang Aerospace University); Kai Tang(Shenyang Aerospace University)"
] |
In structural reliability analysis, the response surface method is widely adopted because of its numerical efficiency. It should be understood that the response function must approximate the actual limit state function accurately in the main region influencing failure probability where it is evaluated. However, the size of main region influencing failure probability was not defined clearly in current response surface methods. In this study, the concept of sub-region of interest is constructed, and an improved response surface method is proposed based on the sub-region of interest. The sub-region of interest can clearly define the size of main region influencing failure probability, so that the accuracy of the evaluation of failure probability is increased. Some examples are introduced to demonstrate the efficiency and the accuracy of the proposed method for both numerical and implicit limit state functions.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002051285
|
oai_dc
|
Parametric modeling and shape optimization of four typical Schwedler spherical reticulated shells
|
Parametric modeling and shape optimization of four typical Schwedler spherical reticulated shells
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J. Wu(Shandong University); X.Y. Lu(Shandong Jianzhu University); S.C. Li(Shandong University); Z.H. Xu(Shandong University); L.P. Li(Shandong University); D.L. Zhang(Shandong Agriculture and Engineering University); Y.G. Xue(Shandong University)"
] |
Spherical reticulated shells are widely applied in structural engineering due to their good bearing capability and attractive appearance. Parametric modeling of spherical reticulated shells is the basis of internal analysis and optimization design. In the present study, generation methods of nodes and the corresponding connection methods of rod elements are proposed. Modeling programs are compiled by adopting the ANSYS Parametric Design Language (APDL). A shape optimization method based on the two-stage algorithm is presented, and the corresponding optimization program is compiled in FORTRAN environment. Shape optimization is carried out based on the objective function of the minimum total steel consumption and the restriction condition of strength, stiffness, slenderness ratio, stability. The shape optimization of four typical Schwedler spherical reticulated shells is calculated with the span of 30 m~80 m and rise to span ratio of 1/7~1/2. Compared with the shape optimization results, the variation rules of total steel consumption along with the span and rise to span ratio are discussed. The results show that: (1) The left and right rod-Schwedler spherical reticulated shell is the most optimized and should be preferentially adopted in structural engineering. (2) The left diagonal rod-Schwedler spherical reticulated shell is second only to left and right rod regarding the mechanical behavior and optimized results. It can be applied to medium and small-span structures. (3) Double slash rod-Schwedler spherical reticulated shell is advantageous in mechanical behavior but with the largest total weight. Thus, this type can be used in large-span structures as far as possible. (4) The mechanical performance of no latitudinal rod-Schwedler spherical reticulated shell is the worst and with the second largest weight. Thus, this spherical reticulated shell should not be adopted generally in engineering.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002051244
|
oai_dc
|
Robust optimization of reinforced concrete folded plate and shell roof structure incorporating parameter uncertainty
|
Robust optimization of reinforced concrete folded plate and shell roof structure incorporating parameter uncertainty
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Soumya Bhattacharjya(Indian Institute of Engineering Science and Technology); Subhasis Chakraborti(Indian Institute of Engineering Science and Technology); Subhashis Das(Indian Institute of Engineering Science and Technology)"
] |
There is a growing trend of considering uncertainty in optimization process since last few decades. In this regard, Robust Design Optimization (RDO) scheme has gained increasing momentum because of its virtue of improving performance of structure by minimizing the variation of performance and ensuring necessary safety and feasibility of constraint under uncertainty. In the present study, RDO of reinforced concrete folded plate and shell structure has been carried out incorporating uncertainty in the relevant parameters by Monte Carlo Simulation. Folded plate and shell structures are among the new generation popular structures often used in aesthetically appealing constructions. However, RDO study of such important structures is observed to be scarce. The optimization problem is formulated as cost minimization problem subjected to the force and displacements constraints considering dead, live and wind load. Then, the RDO is framed by simultaneously optimizing the expected value and the variation of the performance function using weighted sum approach. The robustness in constraint is ensured by adding suitable penalty term and through a target reliability index. The RDO problem is solved by Sequential Quadratic Programming. Subsequently, the results of the RDO are compared with conventional deterministic design approach. The parametric study implies that robust designs can be achieved by sacrificing only small increment in initial cost, but at the same time, considerable quality and guarantee of the structural behaviour can be ensured by the RDO solutions.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002051310
|
oai_dc
|
Simultaneous identification of moving loads and structural damage by adjoint variable
|
Simultaneous identification of moving loads and structural damage by adjoint variable
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Reza Abbasnia(Iran University of Science and Technology); Akbar Mirzaee(Iran University of Science and Technology); Mohsenali Shayanfar(Iran University of Science and Technology)"
] |
This paper presents a novel method based on sensitivity of structural response for identifying both the system parameters and input excitation force of a bridge. This method, referred to as “Adjoint Variable Method”, is a sensitivity-based finite element model updating method. The computational cost of sensitivity analyses is the main concern associated with damage detection by these methods. The main advantage of proposed method is inclusion of an analytical method to augment the accuracy and speed of the solution. The reliable performance of the method to precisely indentify the location and intensity of all types of predetermined single, multiple and random damages over the whole domain of moving vehicle speed is shown. A comparison study is also carried out to demonstrate the relative effectiveness and upgraded performance of the proposed method in comparison to the similar ordinary sensitivity analysis methods. Moreover, various sources of error including the effects of noise and primary errors on the numerical stability of the proposed method are discussed.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002051278
|
oai_dc
|
Neuro-fuzzy and artificial neural networks modeling of uniform temperature effects of symmetric parabolic haunched beams
|
Neuro-fuzzy and artificial neural networks modeling of uniform temperature effects of symmetric parabolic haunched beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Bahadır Yüksel(Selcuk University); Alpaslan Yarar(Selcuk University)"
] |
When the temperature of a structure varies, there is a tendency to produce changes in the shape of the structure. The resulting actions may be of considerable importance in the analysis of the structures having non-prismatic members. The computation of design forces for the non-prismatic beams having symmetrical parabolic haunches (NBSPH) is fairly difficult because of the parabolic change of the cross section. Due to their non-prismatic geometrical configuration, their assessment, particularly the computation of fixed-end horizontal forces and fixed-end moments becomes a complex problem. In this study, the efficiency of the Artificial Neural Networks (ANN) and Adaptive Neuro Fuzzy Inference Systems (ANFIS) in predicting the design forces and the design moments of the NBSPH due to temperature changes was investigated. Previously obtained finite element analyses results in the literature were used to train and test the ANN and ANFIS models. The performances of the different models were evaluated by comparing the corresponding values of mean squared errors (MSE) and decisive coefficients (R2). In addition to this, the comparison of ANN and ANFIS with traditional methods was made by setting up Linear-regression (LR) model.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002051282
|
oai_dc
|
Comparative study on cracked beam with different types of cracks carrying moving mass
|
Comparative study on cracked beam with different types of cracks carrying moving mass
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shakti P. Jena(NIT); Dayal R. Parhi(NIT); Devasis Mishra(NIT)"
] |
An analytical-computational method along with finite element analysis (FEA) has been employed to analyse the dynamic behaviour of deteriorated structures excited by time- varying mass. The present analysis is focused on the comparative study of a double cracked beam with inclined edge cracks and transverse open cracks subjected to traversing mass. The assumed computational method applied is the fourth order Runge-Kutta method. The analysis of the structure has been carried out at constant transit mass and speed. The response of the structure is determined at different crack depth and crack inclination angles. The influence of the parameters like crack depth and crack inclination angles are investigated on the dynamic behaviour of the structure. The results obtained from the assumed computational method are compared with those of the FEA for validation and found good agreements with FEA.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002051286
|
oai_dc
|
Exact mathematical solution for free vibration of thick laminated plates
|
Exact mathematical solution for free vibration of thick laminated plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Asadi Dalir(Bu-Ali Sina University); Alireza Shooshtari(Bu-Ali Sina University)"
] |
In this paper, the modified form of shear deformation plate theories is proposed. First, the displacement field geometry of classical and the first order shear deformation theories are compared with each other. Using this comparison shows that there is a kinematic relation among independent variables of the first order shear deformation theory. So, the modified forms of rotation functions in shear deformation theories are proposed. Governing equations for rectangular and circular thick laminated plates, having been analyzed numerically so far, are solved by method of separation of variables. Natural frequencies and mode shapes of the plate are determined. The results of the present method are compared with those of previously published papers with good agreement obtained. Efficiency, simplicity and excellent results of this method are extensible to a wide range of similar problems. Accurate solution for governing equations of thick composite plates has been made possible for the first time.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002051250
|
oai_dc
|
Stochastic elastic wave analysis of angled beams
|
Stochastic elastic wave analysis of angled beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Changqing Bai(Xi’an Jiaotong University); Hualin Ma(Group limited Company); Victor P.W. Shim(National University of Singapore)"
] |
The stochastic finite element method is employed to obtain a stochastic dynamic model of angled beams subjected to impact loads when uncertain material properties are described by random fields.
Using the perturbation technique in conjunction with a precise time integration method, a random analysis approach is developed for efficient analysis of random elastic waves. Formulas for the mean, variance and covariance of displacement, strain and stress are introduced. Statistics of displacement and stress waves is analyzed and effects of bend angle and material stochasticity on wave propagation are studied. It is found that the elastic wave correlation in the angled section is the most significant. The mean, variance and covariance of the stress wave amplitude decrease with an increase in bend angle. The standard deviation of the beam material density plays an important role in longitudinal displacement wave covariance.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002051307
|
oai_dc
|
Effects of near-fault records characteristics on seismic performance of eccentrically braced frames
|
Effects of near-fault records characteristics on seismic performance of eccentrically braced frames
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Reyhaneh Eskandari(Chabahar Maritime University); Davoud Vafaei(Chabahar Maritime University)"
] |
In this paper the effects of fling-step and forward-directivity on the seismic performance of steel eccentrically braced frames (EBFs) are addressed. Four EBFs with various numbers of stories (4-, 8-, 12- and 15-story) were designed for an area with high seismic hazard. Fourteen near-fault ground motions including seven with forward-directivity and seven with fling-step effects are selected to carry out nonlinear time history (NTH) analyses of the frames. Furthermore, seven more far-field records were selected for comparison. Findings from the study reveal that the median maximum links rotation of the frames subjected to three set of ground motions are in acceptable range and the links completely satisfy the requirement stated in FEMA 356 for LS performance level. The arrival of the velocity pulse in a near-fault record causes few significant plastic deformations, while many reversed inelastic cycles result in low-cycle fatigue damage in far-fault records. Near-fault records in some cases are more destructive and the results of these records are so dispersed, especially the records having fling-step effects.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002051246
|
oai_dc
|
A study on nonlinear analysis and confinement effect of reinforced concrete filled steel tubular column
|
A study on nonlinear analysis and confinement effect of reinforced concrete filled steel tubular column
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Alifujiang Xiamuxi(Xinjiang University); Akira Hasegawa(Hachinohe Institute of Technology); Jiang Yu(Xinjiang University)"
] |
According to former studies, the mechanical properties of reinforced concrete filled tubular steel (RCFT) columns differed greatly from that of concrete filled steel tubular (CFT) columns because of interaction of inserted reinforcement in RCFT. Employing an experiment-based verification policy, a general FE nonlinear analysis model was developed to analyze the mechanical behavior and failure mechanism of RCFT columns under uniaxial compression. The reasonable stress-strain relationships were suggested for confined concrete, reinforcements and steel tube in the model. The mechanism for shear failure of concrete core was found out in the numerical simulation, and a none-conventional method and equation for evaluating the confinement effect of RCFT were proposed.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002051249
|
oai_dc
|
Design of boundary combined footings of trapezoidal form using a new model
|
Design of boundary combined footings of trapezoidal form using a new model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Arnulfo Luévanos Rojas(Juárez University of Durango State)"
] |
This paper presents the design of reinforced concrete combined footings of trapezoidal form subjected to axial load and moments in two directions to each column using a new model to consider soil real pressure acting on the contact surface of the footing; such pressure is presented in terms of an axial load, moment around the axis “X” and moment around the axis “Y” to each column. The classical model considers an axial load and moment around the axis “X” (transverse axis) applied to each column, and when the moments in two directions are taken into account, the maximum pressure throughout the contact surface of the footing is considered the same. The main part of this research is that the proposed model considers soil real pressure and the classical model takes into account the maximum pressure, and also is considered uniform. We conclude that the proposed model is more suited to the real conditions and is more economical.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001932053
|
oai_dc
|
An efficient method to structural static reanalysis with deleting support constraints
|
An efficient method to structural static reanalysis with deleting support constraints
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Haifeng Liu(Xi’an Jiaotong University); Shigang Yue(University of Lincoln)"
] |
Structural design is usually an optimization process. Numerous parameters such as the member shapes and sizes, the elasticity modulus of material, the locations of nodes and the support constraints can be selected as design variables. These variables are progressively revised in order to obtain a satisfactory structure. Each modification requires a fresh analysis for the displacements and stresses, and reanalysis can be employed to reduce the computational cost. This paper is focused on static reanalysis problem withmodification of deleting some supports. An efficient reanalysis method is proposed. The method makes full use of the initial information and preserves the ease of implementation. Numerical examples show that thecalculated results of the proposed method are the identical as those of the direct analysis, while thecomputational time is remarkably reduced.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001932066
|
oai_dc
|
Experimental study on cyclic behavior of reinforced concrete parallel redundancy walls
|
Experimental study on cyclic behavior of reinforced concrete parallel redundancy walls
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yiqiu Lu(Hunan University,); Liang Huang(Hunan University,)"
] |
Reinforced concrete (RC) shear walls are one of the most commonly used lateral-load resisting systems in high-rise buildings. RC Parallel redundancy walls studied herein consist of two parts nested to each other. These two parts have different mechanical behaviors and energy dissipation mechanisms. In this paper, experimental studies of four 1/2-scale specimens representing this concept, which are subjected to inplane cyclic loading, are presented and test results are discussed. Two specimens consist of a wall frame with barbell-shaped walls embedded in it, and the other two consist of a wall frame and braced walls nested each other. The research mainly focuses on the failure mechanism, strength, hysteresis loop, energy dissipationcapacity and stiffness of these walls. Results show that the RC parallel redundancy wall is an efficient lateral load resisting component that acts as a “dual” system with good ductility and energy dissipation capacity. One main part absorbs a greater degree of the energy exerted by an earthquake and fails first, whereas the other part can still behave as an independent role in bearing loads after earthquakes.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001932076
|
oai_dc
|
Behavior of double lining due to long-term hydraulic deterioration of drainage system
|
Behavior of double lining due to long-term hydraulic deterioration of drainage system
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"신종호(건국대학교); 이인근(LH Cooperation); 주은정(건국대학교)"
] |
The hydraulic deterioration of the drainage system in tunnel linings is one of the main factors governing long-term lining-ground interactions during the lifetime of tunnels. Thus, in the design procedure of a tunnel below the groundwater table, the possible detrimental effects associated with the hydraulic deterioration should be addressed. Hydraulic deterioration in double-lined tunnels can occur because of reasons such as clogging of the drainage layer and drain-pipe blockings. In this study, the coupledmechanical and hydraulic interactions between linings due to drain-pipe blockings are investigated using the finite-element method. A double-lined structural model incorporating hydraulic behavior is developed to represent the coupled structural and hydraulic behavior between the linings and drainage system. It is found that hydraulic deterioration hinders flow into the tunnel, causing asymmetric development of pore-water pressure and consequent detrimental effects to the secondary lining.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001932079
|
oai_dc
|
Analysis and prediction of ultimate strength of high-strength SFRC plates under in-plane and transverse loads
|
Analysis and prediction of ultimate strength of high-strength SFRC plates under in-plane and transverse loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ramadoss Perumal(Pondicherry Engineering College); S. Palanivel(Pondicherry Engineering College)"
] |
Plates are most widely used in the hulls of floating concrete structures, bridge decks, walls of offshore structures and liquid storage tanks. A method of analysis is presented for the determination of loaddeflection response and ultimate strength of high-strength steel fiber reinforced concrete (HSSFRC) plates simply supported on all four edges and subjected to combined action of external compressive in-plane and transverse loads. The behavior of HSSFRC plate specimens subjected to combined uniaxial in-plane and transverse loads was investigated. The proposed analytical method is compared to the physical test results, and shows good agreement. To predict the constitutive behavior of HSSFRC in compression, a nondimensional characteristic equation was proposed and found to give reasonable accuracy.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001932038
|
oai_dc
|
Plastic mechanism analysis of vehicle roof frames consisting of spot-welded steel hat sections
|
Plastic mechanism analysis of vehicle roof frames consisting of spot-welded steel hat sections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.R. Bambach(University of New South Wales)"
] |
Plastic mechanism analysis of structures subjected to large deformation has long been used in order to determine collapse mechanisms of steel structures, and the energy absorbed in plastic deformation during such collapses. In this paper the technique is applied to vehicle roof structures that undergo large plastic deformation as a result of rollover crashes. The components of such roof structures are typically steel spot-welded hat-type sections. Ten different deformation mechanisms are defined from investigations of real-world rollover crashes, and an analytical technique to determine the plastic collapse load and energy absorption of such mechanisms is determined. The procedure is presented in a generic manner, such that it may be applied to any vehicle structure undergoing a rollover induced collapse. The procedure is applied to an exemplar vehicle, in order to demonstrate its application in determining the energy absorbed in the deformation of the identified collapse mechanisms. The procedure will be useful to forensic crashreconstructionists, in order to accurately determine the initial travel velocity of a vehicle that has undergone a rollover and for which the post-crash vehicle deformation is known. It may also be used to perform analytical studies of the collapse resistance of vehicle roof structures for optimisation purposes, which is also demonstrated with an analysis of the effect of varying the geometric and material properties of the roof structure components of the exemplar vehicle.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001932031
|
oai_dc
|
Bending of a rectangular plate resting on a fractionalized Zener foundation
|
Bending of a rectangular plate resting on a fractionalized Zener foundation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Cheng-Cheng Zhang(Nanjing University); Hong-Hu Zhu(Nanjing University); Bin Shi(Nanjing University); Guo-Xiong Mei(Guangxi University)"
] |
The long-term performance of plates resting on viscoelastic foundations is a major concern in the analysis of soil-structure interaction. As a powerful mathematical tool, fractional calculus may address these plate-on-foundation problems. In this paper, a fractionalized Zener model is proposed to study the time-dependent behavior of a uniformly loaded rectangular thin foundation plate. By use of the viscoelasticelastic correspondence principle and the Laplace transforms, the analytical solutions were obtained in termsof the Mittag-Leffler function. Through the analysis of a numerical example, the calculated plate deflection, bending moment and foundation reaction were compared to those from ideal elastic and standard viscoelastic models. It is found that the upper and lower bound solutions of the plate response estimated by the proposed model can be determined using the elastic model. Based on a parametric study, the impacts of model parameters on the long-term performance of a foundation plate were systematically investigated. The results show that the two spring stiffnesses govern the upper and lower bound solutions of the plate response. By varying the values of the fractional differential order and the coefficient of viscosity, the timedependent behavior of a foundation plate can be accurately captured. The fractional differential order seems to be dependent on the mechanical properties of the ground soil. A sandy foundation will have a small fractional differential order while in order to simulate the creeping of clay foundation, a larger fractional differential order value is needed. The fractionalized Zener model is capable of accounting for the primary and secondary consolidation processes of the foundation soil and can be used to predict the plateperformance over many decades of time.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001932058
|
oai_dc
|
Bending ratcheting behavior of pressurized straight Z2CND18.12N stainless steel pipe
|
Bending ratcheting behavior of pressurized straight Z2CND18.12N stainless steel pipe
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lei Wang(Tianjin University); Gang Chen(Tianjin University); Jianbei Zhu(Tianjin University); Xiuhu Sun(Tianjin University); Yunhui Mei(Tianjin University); Xiang Ling(NanJing University of Technology); Xu Chen(Tianjin University)"
] |
The ratcheting effect greatly challenges the design of piping components. With the assistance of the quasi-three point bending apparatus, ratcheting and the ratcheting boundary of pressurized straight Z2CND18.12N stainless steel pipe under bending loading and vertical displacement control were studiedexperimentally. The characteristics of progressive inelastic deformation in axial and hoop directions of the Z2CND18.12N stainless steel pipes were investigated. The experiment results show that the ratcheting strainoccurs mainly in the hoop direction while there is less ratcheting strain in the axial direction. Thecharacteristics of the bending ratcheting behavior of the pressure pipes were derived and compared under load control and displacement control, respectively. The results show that the cyclic bending loading and the internal pressure affect the ratcheting behavior of the pressurized straight pipe significantly under loadcontrol. In the meantime, the ratcheting characteristics are also highly associated with the cyclicdisplacement and the internal pressure under displacement control. All these factors affect not only the saturation of the ratcheting strain but the ratcheting strain rate. A series of multi-step bending ratcheting experiments were conducted under both control modes. It was found that the hardening effect of Z2CND18.12N stainless steel pipe under previous cyclic loadings no matter with high or low displacement amplitudes is significant, and the prior loading histories greatly retard the ratcheting strain and its rate under subsequent loadings. Finally, the ratcheting boundaries of the pressurized straight Z2CND18.12N stainless steel pipe were determined and compared based on KTA/ASME, RCC-MR and the experimental results.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001932063
|
oai_dc
|
Energy-based damage-control design of steel frames with steel slit walls
|
Energy-based damage-control design of steel frames with steel slit walls
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ke Ke(Tongji University); Yiyi Chen(Tongji University)"
] |
The objective of this research is to develop a practical design and assessment approach of steel frames with steel slit walls (SSWs) that focuses on the damage-control behavior to enhance the structural resilience. The yielding sequence of SSWs and frame components is found to be a critical issue for thedamage-control behavior and the design of systems. The design concept is validated by the full-scale experiments presented in this paper. Based on a modified energy-balance model, a procedure for designing and assessing the system motivated by the framework regarding the equilibrium of the energy demand and the energy capacity is proposed. The damage-control spectra constructed by strength reduction factors calculated from single-degree-of-freedom systems considering the post stiffness are addressed. A quantitative damage-control index to evaluate the system is also derived. The applicability of the proposedapproach is validated by the evaluation of example structures with nonlinear dynamic analyses. The observations regarding the structural response and the prediction during selected ground motions demonstrate that the proposed approach can be applied to damage-control design and assessment of systemswith satisfactory accuracy.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001932071
|
oai_dc
|
A modified multi-objective elitist-artificial bee colony algorithm for optimization of smart FML panels
|
A modified multi-objective elitist-artificial bee colony algorithm for optimization of smart FML panels
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H. Ghashochi-Bargh(Amirkabir University of Technology); M.H. Sadr(Amirkabir University of Technology)"
] |
In Current paper, the voltages of patches optimization are carried out for minimizing the powerconsumption of piezoelectric patches and maximum vertical displacement of symmetrically FML panelsusing the modified multi-objective Elitist-Artificial Bee Colony (E-ABC) algorithm. The voltages ofpatches, panel length/width ratios, ply angles, thickness of metal sheets and edge conditions are chosen asdesign variables. The classical laminated plate theory (CLPT) is considered to model the transient responseof the panel, and numerical results are obtained by the finite element method. The performance of the EABCis also compared with the PSO algorithm and shows the good efficiency of the E-ABC algorithm. Tocheck the validity, the transient responses of isotropic and orthotropic panels are compared with thoseavailable in the literature and show a good agreement.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001932068
|
oai_dc
|
Non-linear incidental dynamics of frame structures
|
Non-linear incidental dynamics of frame structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Goran N. Radoičić(University of Niš,); Miomir LJ. Jovanović(University of Niš,); Dragan Z. Marinković(Berlin Institute of Technology)"
] |
A simulation of failures on responsible elements is only one form of the extreme structural behavior analysis. By understanding the dynamic behavior in incidental situations, it is possible to make a special structural design from the point of the largest axial force, stress and redundancy. The numerical realization of one such simulation analysis was performed using FEM in this paper. The boundary parameters of transient analysis, such as overall structural damping coefficient, load accelerations, time of load fall and internal forces in the responsible structural elements, were determined on the basis of the dynamic experimental parameters. The structure eigenfrequencies were determined in modal analysis. In the study, the basic incidental models were set. The models were identified by many years of monitoring incidental situations and the most frequent human errors in work with heavy structures. The combined load models of structure are defined in the paper since the incidents simply arise as consequences of cumulative errors and failures. A feature of a combined model is that the single incident causes the next incident (consecutive timing) as well as that other simple dynamic actions are simultaneous. The structure was observed in three typical load positions taken from the crane passport (range-load). The obtained dynamic responses indicate the degree of structural sensitivity depending on the character of incident. The dynamic coefficient KD was adopted as a parameter for the evaluation of structural sensitivity.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001932074
|
oai_dc
|
Design charts for yield acceleration and seismic displacement of retaining walls with surcharge through limit analysis
|
Design charts for yield acceleration and seismic displacement of retaining walls with surcharge through limit analysis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohamad Mahdi Aminpoor(Kharazmi University); Ali Ghanbari(Kharazmi University)"
] |
Calculating the seismic displacement of retaining walls has an important role in the optimum design of these structures. Also, studying the effect of surcharge is important for the calculation of active pressure as well as permanent displacements of the wall. In this regard, some researchers have investigated active pressure; but, unfortunately, there are few investigations on the seismic displacement of retaining walls with surcharge. In this research, using limit analysis and upper bound theorem, permanent seismic displacement of retaining walls with surcharge was analyzed for sliding and overturning failure mechanisms. Thus, a new formulation was presented for calculating yield acceleration, critical angle of failure wedge, and permanent displacement of retaining walls with surcharge. Also, effects of surcharge, its location and other factors such as height of the wall and internal friction angle of soil on the amount of seismic displacements were investigated. Finally, designing charts were presented for calculating yield acceleration coefficient and angle of failure wedge.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART001932047
|
oai_dc
|
Reliability-based design optimization of structural systems using a hybrid genetic algorithm
|
Reliability-based design optimization of structural systems using a hybrid genetic algorithm
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Reza Abbasnia(Iran University of Science and Technology); Mohsenali Shayanfar(Iran University of Science and Technology); Ali Khodam(Iran University of Science and Technology)"
] |
In this paper, reliability-based design optimization (RBDO) of structures is addressed. For this purpose, the global search and optimization capabilities of genetic algorithm (GA) are combined with the efficiency and reasonable accuracy of an advanced moment-based finite element reliability method. For performing RBDO, three variants of GA including a real-coded, a binary-coded and an improved binarycoded GA are developed. In these methods, GA performs (finite element) reliability analyses to evaluate reliability constraints. For truss structures which include finite element modeling, reliability constraints are evaluated using finite element reliability analysis. Response sensitivity required for finite element reliability analysis is obtained by direct differentiation method (DDM) rather than finite difference method (FDM). The proposed methods are examined within four standard test examples and real-world design problems. The results illustrate the superiority and efficiency of the improved binary-coded GA. Results also illustrate that DDM significantly reduces the computational cost and improves the efficiency of the optimization procedure.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002075517
|
oai_dc
|
Dynamic analysis of helicoidal bars with non-circular cross-sections via mixed FEM
|
Dynamic analysis of helicoidal bars with non-circular cross-sections via mixed FEM
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Nihal Eratlı(Istanbul Technical University); Murat Yılmaz(Istanbul Technical University); Kutlu Darılmaz(Istanbul Technical University); Mehmet H. Omurtag(Istanbul Technical University)"
] |
One of the objectives of this study is to implement the direct calculation of the torsional moment of inertia for non-circular cross-sections, which is based on the St. Venant torsion formulation and the finite element method. Recently the proposed method provides a unique calculation of the torsional rigidity of simply and multiply connected cross-sections. Next, free vibration analyses of cylindrical and non-cylindrical helices with non-circular cross-sections are solved by a curved two-nodded mixed finite element based on the Timoshenko beam theory. Some thin-thick closed or open sections are handled and the natural frequencies of cylindrical and non-cylindrical helices are compared with the literature and the commercial finite element program SAP2000.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002075519
|
oai_dc
|
Prediction of residual mechanical behavior of heat-exposed LWAC short column: a NLFE model
|
Prediction of residual mechanical behavior of heat-exposed LWAC short column: a NLFE model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yasmeen T. Obaidat(Yarmouk University); Rami H. Haddad(Jordan University of Science and Technology)"
] |
A NLFE model was proposed to investigate the mechanical behavior of short columns, cast using plain or fibrous lightweight aggregate concrete (LWAC), and subjected to elevated temperatures of up to 700°C. The model was validated, before its predictions were extended to study the effect of other variables, not studied experimentally. The three-dimensional NLFE model was developed using ANSYS software and involved rational simulation of thermal mechanical behavior of plain and fibrous LWAC as well as longitudinal and lateral steel reinforcement. The prediction from the NLFE model of columns' mechanical behavior, as represented by the stress-strain diagram and its characteristics, compared well with the experimental results. The predictions of the proposed models, considering wide range of lateral reinforcement ratios, confirmed the behaviors observed experimentally and stipulated the importance of steel confinement in preserving post-heating mechanical properties of plain and fibrous LWAC columns, being subjected to high temperature.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002075523
|
oai_dc
|
Elastic solutions due to a time-harmonic point load in isotropic multi-layered media
|
Elastic solutions due to a time-harmonic point load in isotropic multi-layered media
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Gao Lin(Dalian University of Technology); Pengchong Zhang(Dalian University of Technology); Jun Liu(Dalian University of Technology); Wenyuan Wang(Dalian University of Technology)"
] |
A new analytical derivation of the elastodynamic point load solutions for an isotropic multilayered half-space is presented by means of the precise integration method (PIM) and the approach of dual vector. The time-harmonic external load is prescribed either on the external boundary or in the interior of the solid medium. Starting with the axisymmetric governing motion equations in a cylindrical coordinate system, a second order ordinary differential matrix equation can be gained by making use of the Hankel integral transform. Employing the technique of dual vector, the second order ordinary differential matrix equation can be simplified into a first-order one. The approach of PIM is implemented to obtain the solutions of the ordinary differential matrix equation in the Hankel integral transform domain. The PIM is a highly accurate algorithm to solve sets of first-order ordinary differential equations and any desired accuracy of the dynamic point load solutions can be achieved. The numerical simulation is based on algebraic matrix operation. As a result, the computational effort is reduced to a great extent and the computation is unconditionally stable. Selected numerical trials are given to validate the accuracy and applicability of the proposed approach. More examples are discussed to portray the dependence of the load-displacement response on the isotropic parameters of the multi-layered media, the depth of external load and the frequency of excitation.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002075522
|
oai_dc
|
Analysis of functionally graded beam using a new first-order shear deformation theory
|
Analysis of functionally graded beam using a new first-order shear deformation theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lazreg Hadji(Université Ibn Khaldoun); T. Hassaine Daouadji(Université Ibn Khaldoun); M. Ait Amar Meziane(Université Ibn Khaldoun); Y. Tlidji(Université Ibn Khaldoun); E.A. Adda Bedia(Université de Sidi Bel Abbes)"
] |
A new first-order shear deformation theory is developed for dynamic behavior of functionally graded beams. The equations governing the axial and transverse deformations of functionally graded plates are derived based on the present first-order shear deformation plate theory. The governing equations and boundary conditions of functionally graded beams have the simple forms as those of isotropic plates. The influences of the volume fraction index and thickness-to-length ratio on the fundamental frequencies are discussed.The accuracy of the present solutions is verified by comparing the obtained results with the existing solutions.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002075518
|
oai_dc
|
Natural vibration of the three-layered solid sphere with middle layer made of FGM: three-dimensional approach
|
Natural vibration of the three-layered solid sphere with middle layer made of FGM: three-dimensional approach
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Surkay D. Akbarov(Yildiz Technical University); Hatam H. Guliyev(Institute of Geology and Geophysics of the National Academy of Sciences of Azerbaijan); Nazmiye Yahnioglu(Yildiz Technical University)"
] |
The paper studies the natural oscillation of the three-layered solid sphere with a middle layer made of Functionally Graded Material (FGM). It is assumed that the materials of the core and outer layer of the sphere are homogeneous and isotropic elastic. The three-dimensional exact equations and relations of linear elastodynamics are employed for the investigations. The discrete-analytical method proposed by the first author in his earlier works is applied for solution of the corresponding eigenvalue problem. It is assumed that the modulus of elasticity, Poisson’s ratio and density of the middle-layer material vary continuously through the inward radial direction according to power law distribution. Numerical results on the natural frequencies related to the torsional and spheroidal oscillation modes are presented and discussed.
In particular, it is established that the increase of the modulus of elasticity (mass density) in the inward radial direction causes an increase (a decrease) in the values of the natural frequencies.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002075521
|
oai_dc
|
Effect of stacking sequence of the bonded composite patch on repair performance
|
Effect of stacking sequence of the bonded composite patch on repair performance
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hadja Imane Beloufa(University Abdelhamid Ibn Badis of Mostaganem); Djamel Ouinas(University Abdelhamid Ibn Badis of Mostaganem); Mostapha Tarfaoui(Laboratoire Brestois de Mécanique et des Systèmes); Noureddine Benderdouche(University Abdelhamid Ibn Badis of Mostaganem)"
] |
In this study, the three-dimensional finite element method is used to determine the stress intensity factor in Mode I and Mixed mode of a centered crack in an aluminum specimen repaired by a composite patch using contour integral. Various mesh densities were used to achieve convergence of the results. The effect of adhesive joint thickness, patch thickness, patch-specimen interface and layer sequence on the SIF was highlighted. The results obtained show that the patch-specimen contact surface is the best indicator of the deceleration of crack propagation, and hence of SIF reduction. Thus, the reduction in rigidity of the patch especially at adhesive layer-patch interface, allows the lowering of shear and normal stresses in the adhesive joint. The choice of the orientation of the adhesive layer-patch contact is important in the evolution of the shear and peel stresses. The patch will be more beneficial and effective while using the cross-layer on the contact surface.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002075516
|
oai_dc
|
Wave propagation in a two-temperature fiber-reinforced magneto-thermoelastic medium with three-phase-lag model
|
Wave propagation in a two-temperature fiber-reinforced magneto-thermoelastic medium with three-phase-lag model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Samia M. Said(Zagazig University); Mohamed I.A. Othman(Taif University)"
] |
A general model of equations of the two-temperature theory of generalized thermoelasticity is applied to study the wave propagation in a fiber-reinforced magneto-thermoelastic medium in the context of the three-phase-lag model and Green-Naghdi theory without energy dissipation. The material is a homogeneous isotropic elastic half-space. The exact expression of the displacement components, force stresses, thermodynamic temperature and conductive temperature is obtained by using normal mode analysis. The variations of the considered variables with the horizontal distance are illustrated graphically.
Comparisons are made with the results of the two theories in the absence and presence of a magnetic field as well as a two-temperature parameter. A comparison is also made between the results of the two theories in the absence and presence of reinforcement.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002075520
|
oai_dc
|
A mesh-free analysis method of structural elements of engineering structures based on B-spline wavelet basis function
|
A mesh-free analysis method of structural elements of engineering structures based on B-spline wavelet basis function
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jianping Chen(Guangzhou Maritime Institute); Wenyong Tang(Shanghai Jiao Tong University); Pengju Huang(Guangzhou Maritime Institute); Li Xu(Fujian Chuanzheng Communications College)"
] |
The paper is devoted to study a mesh-free analysis method of structural elements of engineering structures based on B-spline Wavelet Basis Function. First, by employing the moving-least square method and the weighted residual method to solve the structural displacement field, the control equations and the stiffness equations are obtained. And then constructs the displacement field of the structure by using the m-order B-spline wavelet basis function as a weight function. In the end, the paper selects the plane beam structure and the structure with opening hole to carry out numerical analysis of deformation and stress. The Finite Element Method calculation results are compared with the results of the method proposed, and the calculation results of the relative error norm is compared with Gauss weight function as weight function. Therefore, the clarification verified the validity and accuracy of the proposed method.
|
토목공학
| null |
kci_detailed_000069.xml
|
|||
ART002075525
|
oai_dc
|
Homogenized thermal properties of 3D composites with full uncertainty in the microstructure
|
Homogenized thermal properties of 3D composites with full uncertainty in the microstructure
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Juan Ma(Xidian University); Peter Wriggers(Leibniz Universität Hannover); Liangjie Li(Xidian University)"
] |
In this work, random homogenization analysis for the effective thermal properties of a three-dimensional composite material with unidirectional fibers is presented by combining the equivalent inclusion method with Random Factor Method (RFM). The randomness of the micro-structural morphology and constituent material properties as well as the correlation among these random parameters are completely accounted for, and stochastic effective thermal properties as thermal expansion coefficients as well as their correlation are then sought. Results from the RFM and the Monte-Carlo Method (MCM) are compared. The impact of randomness and correlation of the micro-structural parameters on the random homogenized results is revealed by two methods simultaneously, and some important conclusions are obtained.
|
토목공학
| null |
kci_detailed_000069.xml
|
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.