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ART001792689
|
oai_dc
|
Online estimation of noise parameters for Kalman filter
|
Online estimation of noise parameters for Kalman filter
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ka-Veng Yuen(University of Macau); Peng-Fei Liang(University of Macau); Sin-Chi Kuok(University of Macau)"
] |
A Bayesian probabilistic method is proposed for online estimation of the process noise and measurement noise parameters for Kalman filter. Kalman filter is a well-known recursive algorithm for state estimation of dynamical systems. In this algorithm, it is required to prescribe the covariance matrices of the process noise and measurement noise. However, inappropriate choice of these covariance matrices substantially deteriorates the performance of the Kalman filter. In this paper, a probabilistic method is proposed for online estimation of the noise parameters which govern the noise covariance matrices. The proposed Bayesian method not only estimates the optimal noise parameters but also quantifies the associated estimation uncertainty in an online manner. By utilizing the estimated noise parameters, reliable state estimation can be accomplished. Moreover, the proposed method does not assume any stationarity condition of the process noise and/or measurement noise. By removing the stationarity constraint, the proposed method enhances the applicability of the state estimation algorithm for nonstationary circumstances generally encountered in practice. To illustrate the efficacy and efficiency of the proposed method, examples using a fifty-story building with different stationarity scenarios of the process noise and measurement noise are presented.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001792692
|
oai_dc
|
Asymmetric transient thermal stress of a functionally graded hollow cylinder with piecewise power law
|
Asymmetric transient thermal stress of a functionally graded hollow cylinder with piecewise power law
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yoshihiro Ootao(Osaka Prefecture University); Masayuki Ishihara(Osaka Prefecture University)"
] |
This paper is concerned with the theoretical treatment of transient thermoelastic problems involving a functionally graded hollow cylinder with piecewise power law due to asymmetrical heating from its surfaces. The thermal and thermoelastic constants of each layer are expressed as power functions of the radial coordinate, and their values continue on the interfaces. The exact solution for the two-dimensional temperature change in a transient state, and thermoelastic response of a hollow cylinder under the state of plane strain is obtained herein. Some numerical results for the temperature change and the stress distributions are shown in figures. Furthermore, the influence of the functional grading on the thermal stresses is investigated.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001792691
|
oai_dc
|
Effects of infill walls on RC buildings under time history loading using genetic programming and neuro-fuzzy
|
Effects of infill walls on RC buildings under time history loading using genetic programming and neuro-fuzzy
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Metin Kose(K. Sutcu Imam University); Cafer Kayadelen(K. Sutcu Imam University)"
] |
In this study, the efficiency of adaptive neuro-fuzzy inference system (ANFIS) and genetic expression programming (GEP) in predicting the effects of infill walls on base reactions and roof drift of reinforced concrete frames were investigated. Current standards generally consider weight and fundamental period of structures in predicting base reactions and roof drift of structures by neglecting numbers of floors, bays, shear walls and infilled bays. Number of stories, number of bays in x and y directions, ratio of shear wall areas to the floor area, ratio of bays with infilled walls to total number bays and existence of open story were selected as parameters in GEP and ANFIS modeling. GEP and ANFIS have been widely used as alternative approaches to model complex systems. The effects of these parameters on base reactions and roof drift of RC frames were studied using 3D finite element method on 216 building models. Results obtained from 3D FEM models were used to in training and testing ANFIS and GEP models. In ANFIS and GEP models, number of floors, number of bays, ratio of shear walls and ratio of infilled bays were selected as input parameters, and base reactions and roof drifts were selected as output parameters. Results showed that the ANFIS and GEP models are capable of accurately predicting the base reactions and roof drifts of RC frames used in the training and testing phase of the study. The GEP model results better prediction compared to ANFIS model.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001792690
|
oai_dc
|
Tensile behavior of new 2,200 MPa and 2,400 MPa strands according to various types of mono anchorage
|
Tensile behavior of new 2,200 MPa and 2,400 MPa strands according to various types of mono anchorage
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jin Kook Kim(POSCO Global R&D Center); Taek Ryong Seong(POSCO Global R&D Center); Kyung Pil Jang(Myongji University); 권승희(Myongji University)"
] |
High-strength strands are widely used as a key structural element in cable-stayed bridges and prestressed concrete structures. Conventional strands for stay cable and tendons in prestressed concrete structures are ϕ15.7mm coated seven-wire strands and ϕ15.2mm uncoated seven-wire strands, respectively, but the ultimate strengths of both strands are 1860MPa. The objective of this paper is to investigate the tensile behavior of a newly developed ϕ15.7mm 2,200 MPa coated strand and a ϕ15.2mm 2,400 MPa uncoated strand according to various types of mono anchorages and to propose appropriate anchorages for both strands. Finite element analyses were initially performed to find how the geometry of the anchor head affects the interaction among the anchor head, the wedge and the strand and to find how it affects the stress distributions in both parts. Tensile tests for the new strands were carried out with seven different types of mono anchorages. The test results were compared to each other and to the results obtained from the tensile tests with a grip condition. From the analysis and the test results, desirable mono anchorages for the new strands are suggested.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001792688
|
oai_dc
|
Exact solution for free vibration of curved beams with variable curvature and torsion
|
Exact solution for free vibration of curved beams with variable curvature and torsion
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Li-li Zhu(Dalian Jiaotong University); Ying-hua Zhao(Dalian Maritime University); Guang-xin Wang(Dalian Maritime University)"
] |
For the purpose of investigating the free vibration response of the spatial curved beams, the governing equations are derived in matrix formats, considering the variable curvature and torsion. The theory includes all the effects of rotary inertia, shear and axial deformations. Frobenius’ scheme and the dynamic stiffness method are then applied to solve these equations. A computer program is coded in Mathematica according to the proposed method. As a special case, the dynamic stiffness and further the natural frequencies of a cylindrical helical spring under fixed-fixed boundary condition are carried out. Comparison of the present results with the FEM results using body elements in I-DEAS shows good accuracy in computation and validity of the model. Further, the present model is used for reciprocal spiral rods with different boundary conditions, and the comparison with FEM results shows that only a limited number of terms in the resultant provide a relatively accurate solution.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001792687
|
oai_dc
|
Sloshing characteristics of an annular cylindrical tuned liquid damper for spar-type floating offshore wind turbine
|
Sloshing characteristics of an annular cylindrical tuned liquid damper for spar-type floating offshore wind turbine
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"전수홍(부산대학교); M.W. Seo(Pusan National University); Y.U. Cho(Pusan National University); 박원규(부산대학교); 정의봉(부산대학교)"
] |
The natural sloshing frequencies of annular cylindrical TLD are parametrically investigated by experiment, aiming at the exploration of its successful use for suppressing the structural vibration of spar-type floating wind turbine subject to multidirectional wind, wave and current excitations. Five prototypes of annular cylindrical TLD are defined according to the inner and outer radii of acryl container, and eight different liquid fill heights are experimented for each TLD prototype. The apparent masses near the first and second natural sloshing frequencies are parametrically investigated by measuring the apparent mass of interior liquid sloshing to the acceleration excitation. It is observed from the parametric experiments that the first natural sloshing frequency shows the remarkable change with respect to the liquid fill height for each TLD model with different container dimensions. On the other hand, the second natural sloshing frequency is not sensitive to the liquid fill height but to the gap size, for all the TLD models, convincing that the annular cylindrical sloshing damper can effectively suppress the wave- and wind-induced tilting motion of the spar-type floating wind turbine.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001792686
|
oai_dc
|
Exact stochastic solution of beams subjected to delta-correlated loads
|
Exact stochastic solution of beams subjected to delta-correlated loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"G. Falsone(Università di Messina); D. Settineri(Università di Messina)"
] |
The bending problem of Euler-Bernoulli discontinuous beams is dealt with, in which the discontinuities are due to the loads and eventually to essential constrains applied along the beam axis. In particular, the loads are modelled as random delta-correlated processes acting along the beam axis, while the ulterior eventual discontinuities are produced by the presence of external rollers applied along the beam axis. This kind of structural model can be considered in the static study of bridge beams. In the present work the exact expression of the response quantities are given in terms of means and variances, thanks to the use of the stochastic analysis rules and to the use of the generalized functions. The knowledge of the means and the variances of the internal forces implies the possibility of applying the reliability β-method for verifying the beam.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001819167
|
oai_dc
|
Physical insight into Timoshenko beam theory and its modification with extension
|
Physical insight into Timoshenko beam theory and its modification with extension
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ivo Senjanović(University of Zagreb); Nikola Vladimir(University of Zagreb)"
] |
An outline of the Timoshenko beam theory is presented. Two differential equations of motion in terms of deflection and rotation are comprised into single equation with deflection and analytical solutions of natural vibrations for different boundary conditions are given. Double frequency phenomenon for simply supported beam is investigated. The Timoshenko beam theory is modified by decomposition of total deflection into pure bending deflection and shear deflection, and total rotation into bending rotation and axial shear angle. The governing equations are condensed into two independent equations of motion, one for flexural and another for axial shear vibrations. Flexural vibrations of a simply supported, clamped and free beam are analysed by both theories and the same natural frequencies are obtained. That fact is proved in an analytical way. Axial shear vibrations are analogous to stretching vibrations on an axial elastic support, resulting in an additional response spectrum, as a novelty. Relationship between parameters in beam response functions of all type of vibrations is analysed.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001819166
|
oai_dc
|
Exploring and calibrating local curvature effect of cortical bone for quantitative ultrasound (QUS)
|
Exploring and calibrating local curvature effect of cortical bone for quantitative ultrasound (QUS)
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jiangang Chen(The Hong Kong Polytechnic University); Zhongqing Su(The Hong Kong Polytechnic University); Li Cheng(The Hong Kong Polytechnic University); De-an Ta(Fudan University)"
] |
Apart from thinning of cortical layers, the local bone curvature, varying along bone periphery,modulates ultrasound waves as well, which is however often underestimated or overlooked in clinical quantitative ultrasound (QUS). A dedicated three-dimensional finite element modelling technique for cortical bones was established, for quantitatively exploring and calibrating the effect of local curvature of cortical bone on ultrasound. Using a correlation-based mode extraction technique, high-velocity group (HVG) and low-velocity group (LVG) wave modes in a human radius were examined. Experimental verification using acrylic cylinders and in vitro testing using a porcine femur were accomplished. Results coherently unravelled the cortical curvature exerts evident influence on bone-guided ultrasound when RoC/λ<1 for HVG mode and RoC/λ<2 for LVG mode (RoC/λ: the ratio of local bone curvature radius to wavelength); the sensitivity of LVG mode to bone curvature is higher than HVG mode. It has also been demonstrated the local group velocity of an HVG or LVG mode at a particular skeletal site is equivalent to the velocity when propagating in a uniform cylinder having an outer radius identical to the radius of curvature at that site. This study provides a rule of thumb to compensate for the effect of bone curvature in QUS.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001819164
|
oai_dc
|
Comparison between reinforced concrete designs based on the ACI 318 and BS 8110 codes
|
Comparison between reinforced concrete designs based on the ACI 318 and BS 8110 codes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sami W. Tabsh(American University of Sharjah)"
] |
Municipalities in the United Arab Emirates approve reinforced concrete design of building structures to follow either the ACI 318 or the BS 8110 code. Since the requirements of these codes are different from each, there is a need to compare the structural demand in the two codes. The main objective of this study is to compare the design requirements of the ACI 318 code with the BS 8110 code for the flexural, shear and axial compression limit states. The load factors and load combinations in the two codes are also compared. To do so, a large number of cross-sections with different geometries, material properties, and reinforcement ratios are analyzed following the procedures in the two codes. The relevant factored load combinations in the two codes are also investigated for a wide range of live-to-dead load ratios and for various wind-to-dead load ratios. The study showed that the differences between the design capacities in the ACI 318 and BS 8110 codes are minor for flexure, moderate for axial compression, and major for shear. Furthermore, the factored load combinations for dead load, live load and wind in the two codes yield minorto-moderate differences, depending on the live-to-dead load ratio and intensity of wind
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001819162
|
oai_dc
|
Wind-rain-induced vibration test and analytical method of high-voltage transmission tower
|
Wind-rain-induced vibration test and analytical method of high-voltage transmission tower
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hong-Nan Li(Dalian University of Technology); Shun-Yong Tang(Dalian University of Technology); Ting-Hua Yi(Dalian University of Technology)"
] |
A new computational approach for the rain load on the transmission tower is presented to obtain the responses of system subjected to the wind and rain combined excitations. First of all, according to the similarity theory, the aeroelastic modeling of high-voltage transmission tower is introduced and two kinds of typical aeroelastic models of transmission towers are manufactured for the wind tunnel tests, which are the antelope horn tower and pole tower. And then, a formula for the pressure time history of rain loads on the tower structure is put forward. The dynamic response analyses and experiments for the two kinds of models are carried out under the wind-induced and wind-rain-induced actions with the uniform and turbulent flow.
It has been shown that the results of wind-rain-induced responses are bigger than those of only wind-induced responses and the rain load influence on the transmission tower can‟t be neglected during the strong rainstorm. The results calculated by the proposed method have a good agreement with those by the wind tunnel test. In addition, the wind-rain-induced responses along and across the wind direction are in the same order of response magnitude of towers.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001819165
|
oai_dc
|
Lateral deformation capacity and stability of layer-bonded scrap tire rubber pad isolators under combined compressive and shear loading
|
Lateral deformation capacity and stability of layer-bonded scrap tire rubber pad isolators under combined compressive and shear loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Huma Kanta Mishra(Kyoto University); Akira Igarashi(Kyoto University)"
] |
This paper presents the experimental as well as analytical study conducted on layer-bonded scrap tire rubber pad (STRP) isolators to develop low-cost seismic isolators applicable to structures in developing countries. The STRP specimen samples were produced by stacking the STRP layers one on top of another with the application of adhesive. In unbonded application, the STRP bearings were placed between the substructure and superstructure without fastening between the contact surfaces which allows roll-off of the contact supports. The vertical compression and horizontal shear tests were conducted with varying axial loads. These results were used to compute the different mechanical properties of the STRP isolators including vertical stiffness, horizontal effective stiffness, average horizontal stiffness and effective damping ratios. The load-displacement relationships of STRP isolators obtained by experimental and finite element analysis results were found to be in close agreement. The tested STRP samples show energy dissipation capacity considerably greater than the natural rubber bearings. The layer-bonded STRP isolators serve positive incremental force resisting capacity up to the shear strain level of 150%.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001819168
|
oai_dc
|
Nonlinear thermal buckling behavior of functionally graded plates using an efficient sinusoidal shear deformation theory
|
Nonlinear thermal buckling behavior of functionally graded plates using an efficient sinusoidal shear deformation theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Rabbab Bachir Bouiadjra(Université Sciences et de la Technologie d’Oran); E.A. Adda Bedia(Université de Sidi Bel Abbes); Abdelouahed Tounsi(Université de Sidi Bel Abbes)"
] |
Nonlinear behavior of functionally graded material (FGM) plates under thermal loads is investigated here using an efficient sinusoidal shear deformation theory. The displacement field is chosen based on assumptions that the in-plane and transverse displacements consist of bending and shear components, and the shear components of in-plane displacements give rise to the sinusoidal distribution of transverse shear stress through the thickness in such a way that shear stresses vanish on the plate surfaces. Therefore, there is no need to use shear correction factor. Unlike the conventional sinusoidal shear deformation theory, the proposed efficient sinusoidal shear deformation theory contains only four unknowns. The material is graded in the thickness direction and a simple power law based on the rule of mixture is used to estimate the effective material properties. The neutral surface position for such FGM plates is determined and the sinusoidal shear deformation theory based on exact neutral surface position is employed here. 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. The non-linear strain–displacement relations are also taken into consideration. The thermal loads are assumed as uniform, linear and non-linear temperature rises across the thickness direction. Closed-form solutions are presented to calculate the critical buckling temperature, which are useful for engineers in design. Numerical results are presented for the present efficient sinusoidal shear deformation theory, demonstrating its importance and accuracy in comparison to other theories.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001819169
|
oai_dc
|
Impact of a shock wave on a structure strengthened by rigid polyurethane foam
|
Impact of a shock wave on a structure strengthened by rigid polyurethane foam
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sherif A. Mazek(Military Technical College); Ashraf A. Mostafa(Egyptian Engineering Department)"
] |
The use of the rigid polyurethane foam (RPF) to strengthen sandwich structures against blast terror has great interests from engineering experts in structural retrofitting. The aim of this study is to use the RPF to strengthen sandwich steel structure under blast load. The sandwich steel structure is assembled to study the RPF as structural retrofitting. The filed blast test is conducted. The finite element analysis (FEA) is also used to model the sandwich steel structure under shock wave.
The sandwich steel structure performance is studied based on detonating different TNT explosive charges. There is a good agreement between the results obtained by both the field blast test and the numerical model. The RPF improves the sandwich steel structure performance under the blast wave propagation
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001819163
|
oai_dc
|
Continous rail absorber design using decay rate calculation in FEM
|
Continous rail absorber design using decay rate calculation in FEM
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Habibollah Molatefi(Iran University of Science and Technology); Soroush Izadbakhsh(Iran University of Science and Technology)"
] |
In recent years, many countries have added railway noise to the issues covered by noise regulations. It is known that the rail is the dominant source of rolling noise at frequency range of 500Hz -2000Hz for the conventional speeds (<160km/h). One of the effective ways to reduce noise from railway track is using a rail vibration absorber. To study the acoustic performance of rail absorber, the decay rates of vibration have long been used by researcher. In this paper, A FE model of a periodic supported rail with infinite element in ABAQUS is developed to study the acoustic performance of the rail absorber. To compute the decay rates, acceleration responses along the rail transferred to MATLAB to obtain response levels in frequency domain and then by processing the response levels, the decay rates obtained for each1/3octav band. Continous rail absorber is represented by a steel layer and an elastomer layer. The decay rates for conventional rail and rail with one-side absorber and also, the rail with two side absorber are obtained and compared. Then, to improve the system of rail absorber, a steel plate with elastomer layer is added to bottom of the rail foot. The vertical decay rate results show that the decay rate of rail vibration along the track is significantly increased around the tuned frequency of the absorber and thus the rail vibration energy is substantially reduced in the corresponding frequency region and also effective in rail noise reduction.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001758913
|
oai_dc
|
Vibration analysis of high nonlinear oscillators using accurate approximate methods
|
Vibration analysis of high nonlinear oscillators using accurate approximate methods
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"I. Pakar(Islamic Azad University); M. Bayat(Islamic Azad University)"
] |
In this paper, two new methods called Improved Amplitude-Frequency Formulation (IAFF) and Energy Balance Method (EBM) are applied to solve high nonlinear oscillators. Two cases are given to illustrate the effectiveness and the convenience of these methods. The results of Improved Amplitude-Frequency Formulation are compared with those of EBM. The comparison of the results obtained using these methods reveal that IAFF and EBM are very accurate and can therefore be found widely applicable in engineering and other science. Finally, to demonstrate the validity of the proposed methods, the response of the oscillators, which were obtained from analytical solutions, have been shown graphically and compared with each other.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001758909
|
oai_dc
|
Automated nonlinear design of reinforced concrete D regions
|
Automated nonlinear design of reinforced concrete D regions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hamidreza Amini Najafian(Imperial College London); Robert L. Vollum(Imperial College London)"
] |
This paper proposes a novel iterative procedure for the design of planar reinforced concrete structures in which the reinforcement is designed for stresses calculated in a nonlinear finite element analysis. The procedure is intended as an alternative to strut and tie modeling for the design of complex structures like deep beams with openings. Practical reinforcement arrangements are achieved by grouping the reinforcement into user defined horizontal and vertical bands. Two alternative strategies are proposed for designing the reinforcement which are designated A and B. Design constraints are specified in terms of permissible stresses and strains in the reinforcement and strains in the concrete. A case study of a deep beam with an opening is presented to illustrate the method. Comparisons are made between design strategies A and B of which B is shown to be most efficient. The resulting reinforcement weights are also shown to compare favorably with those previously reported in the literature.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001758893
|
oai_dc
|
Free vibration analysis of asymmetric shear wall-frame buildings using modified finite element-transfer matrix method
|
Free vibration analysis of asymmetric shear wall-frame buildings using modified finite element-transfer matrix method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kanat B. Bozdogan(Kirklareli University)"
] |
In this study, the modified finite element- transfer matrix methods are proposed for free vibration analysis of asymmetric structures, the bearing system of which consists of shear wall-frames. In the study, a multi-storey structure is divided into as many elements as the number of storeys and storey masses are influenced as separated at alignments of storeys. The shear walls and frames are assumed to be flexural and shear cantilever beam structures. The storey stiffness matrix is obtained by formulating the governing equation at the center of mass for the shear walls and the frames in the i.th floor. The system transfer matrix is constructed in the dimension of 6×6 by transforming the obtained stiffness matrix. Thus, the dimension, which is 12n×12n in classical finite elements, is reduced to the dimension of 6×6. To study the suitability of the method, the results are assessed by solving two examples taken from the literature.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001758901
|
oai_dc
|
Integral Abutment Bridge behavior under uncertain thermal and time-dependent load
|
Integral Abutment Bridge behavior under uncertain thermal and time-dependent load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김우석(충남대학교); Jeffrey A. Laman(Pennsylvania State University)"
] |
Prediction of prestressed concrete girder integral abutment bridge (IAB) load effect requires understanding of the inherent uncertainties as it relates to thermal loading, time-dependent effects, bridge material properties and soil properties. In addition, complex inelastic and hysteretic behavior must be considered over an extended, 75-year bridge life. The present study establishes IAB displacement and internal force statistics based on available material property and soil property statistical models and Monte Carlo simulations. Numerical models within the simulation were developed to evaluate the 75-year bridge displacements and internal forces based on 2D numerical models that were calibrated against four field monitored IABs. The considered input uncertainties include both resistance and load variables. Material variables are: (1) concrete elastic modulus; (2) backfill stiffness; and (3) lateral pile soil stiffness. Thermal, time dependent, and soil loading variables are: (1) superstructure temperature fluctuation; (2) superstructure concrete thermal expansion coefficient; (3) superstructure temperature gradient; (4) concrete creep and shrinkage; (5) bridge construction timeline; and (6) backfill pressure on backwall and abutment. IAB displacement and internal force statistics were established for: (1) bridge axial force; (2) bridge bending moment; (3) pile lateral force; (4) pile moment; (5) pile head/abutment displacement; (6) compressive stress at the top fiber at the mid-span of the exterior span; and (7) tensile stress at the bottom fiber at the mid-span of the exterior span. These established IAB displacement and internal force statistics provide a basis for future reliability-based design criteria development.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001758897
|
oai_dc
|
An extremum method for bending-wrinkling predictions of inflated conical cantilever beam
|
An extremum method for bending-wrinkling predictions of inflated conical cantilever beam
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Changguo Wang(Harbin Institute of Technology); Zhenyong Du(Harbin Institute of Technology); Huifeng Tan(Harbin Institute of Technology)"
] |
An extremum method is presented to predict the wrinkling characteristics of the inflated cone in bending. The wrinkling factor is firstly defined so as to obtain the wrinkling condition. The initial wrinkling location is then determined by searching the maximum of the wrinkling factor. The critical wrinkling load is finally obtained by determining the ratio of the wrinkling moment versus the initial wrinkling location. The extremum method is proposed based on the assumption of membrane material of beam wall, and it is extended to consider beam wall with thin-shell material in the end. The nondimensional analyses show that the initial wrinkling location is closely related to the taper ratio. When the taper ratio is higher than the critical value, the initial wrinkles will be initiated at a different location. The nondimensional critical wrinkling load nonlinearly increases as the taper ratio increases firstly, and then linearly increases after the critical taper ratio. The critical taper ratio reflects the highest load-carrying efficiency of the inflated cone in bending, and it can be regarded as a measure to optimize the geometry of the inflated cone. The comparative analysis shows fairly good agreement between analytical and numerical results. Over the whole range of the comparison, the mean differences are lower than 3%. This gives confidence to use extremum method for bending-wrinkling analysis of inflated conical cantilever beam.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001758905
|
oai_dc
|
Bridge-vehicle coupled vibration response and static test data based damage identification of highway bridges
|
Bridge-vehicle coupled vibration response and static test data based damage identification of highway bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jinsong Zhu(Tianjin University); Qiang Yi(Tianjin University)"
] |
In order to identify damage of highway bridges rapidly, a method for damage identification using dynamic response of bridge induced by moving vehicle and static test data is proposed. To locate damage of the structure, displacement energy damage index defined from the energy of the displacement response time history is adopted as the indicator. The displacement response time histories of bridge structure are obtained from simulation of vehicle-bridge coupled vibration analysis. The vehicle model is considered as a four-degree-of-freedom system, and the vibration equations of the vehicle model are deduced based on the D’Alembert principle. Finite element method is used to discretize bridge and finite element model is set up. According to the condition of displacement and force compatibility between vehicle and bridge, the vibration equations of the vehicle and bridge models are coupled. A Newmark-β algorithm based professional procedure VBAP is developed in MATLAB, and used to analyze the vehicle-bridge system coupled vibration. After damage is located by employing the displacement energy damage index, the damage extent is estimated through the least-square-method based model updating using static test data. At last, taking one simply supported bridge as an illustrative example, some damage scenarios are identified using the proposed damage identification methodology. The results indicate that the proposed method is efficient for damage localization and damage extent estimation.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001758894
|
oai_dc
|
Optimal design of Base Isolation System considering uncertain bounded system parameters
|
Optimal design of Base Isolation System considering uncertain bounded system parameters
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Bijan Kumar Roy(Bengal Engineering and Science University); Subrata Chakraborty(Bengal Engineering and Science University)"
] |
The optimum design of base isolation system considering model parameter uncertainty is usually performed by using the unconditional response of structure obtained by the total probability theory, as the performance index. Though, the probabilistic approach is powerful, it cannot be applied when the maximum possible ranges of variations are known and can be only modelled as uncertain but bounded type. In such cases, the interval analysis method is a viable alternative. The present study focuses on the bounded optimization of base isolation system to mitigate the seismic vibration effect of structures characterized by bounded type system parameters. With this intention in view, the conditional stochastic response quantities are obtained in random vibration framework using the state space formulation. Subsequently, with the aid of matrix perturbation theory using first order Taylor series expansion of dynamic response function and its interval extension, the vibration control problem is transformed to appropriate deterministic optimization problems correspond to a lower bound and upper bound optimum solutions. A lead rubber bearing isolating a multi-storeyed building frame is considered for numerical study to elucidate the proposed bounded optimization procedure and the optimum performance of the isolation system.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001758911
|
oai_dc
|
Strength model for square concrete columns confined by external CFRP sheets
|
Strength model for square concrete columns confined by external CFRP sheets
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Riad Benzaid(Jijel University); Habib Abdelhak Mesbah(University of Rennes 1)"
] |
An experimental study has been carried out on square plain concrete (PC) and reinforced concrete (RC) columns strengthened with carbon fiber-reinforced polymer (CFRP) sheets. A total of 78 specimens were loaded to failure in axial compression and investigated in both axial and transverse directions. Slenderness of the columns, number of wrap layers and concrete strength were the test parameters. Compressive stress, axial and hoop strains were recorded to evaluate the stress-strain relationship, ultimate strength and ductility of the specimens. Results clearly demonstrate that composite wrapping can enhance the structural performance of square columns in terms of both maximum strength and ductility. On the basis of the effective lateral confining pressure of composite jacket and the effective FRP strain coefficient, new peak stress equations were proposed to predict the axial strength and corresponding strain of FRP-confined square concrete columns. This model incorporates the effect of the effective circumferential FRP failure strain and the effect of the effective lateral confining pressure. The results show that the predictions of the model agree well with the test data.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001812612
|
oai_dc
|
Progressive collapse analysis of two existing steel buildings using a linear static procedure
|
Progressive collapse analysis of two existing steel buildings using a linear static procedure
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Reza JalaliLarijani(Eastern Mediterranean University); Murude Celikag(Eastern Mediterranean University); Iman Aghayan(Shahrood University of Technology); Mahdi Kazemi(Eastern Mediterranean University)"
] |
In this study, the vulnerability of two existing asymmetric steel building frames to Progressive Collapse (PC) is assessed. The buildings have different frame systems, steel sections and number of stories (nine and six). An alternate path method (APM) with a linear static analysis (LS) is carried out according to General Services Administration (GSA) 2003 guidelines. The Demand Capacity Ratio (DCR) of each primary element (beams and columns) is given with its specific details for all frames. The results show that the nine-story building with a dual frame system (moment frame with bracing system) has a lower susceptibility and greater resistance to PC than the six-story building with a simple building frame system (gravity system with bracing system). Implementing built-up box-shaped sections for columns is a better choice than using built-up I-shaped sections because there is no weak axis for the box section.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001812617
|
oai_dc
|
The receding contact problem of two elastic layers supported by two elastic quarter planes
|
The receding contact problem of two elastic layers supported by two elastic quarter planes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Murat Yaylacı(Karadeniz Technical University); Ahmet Birinci(Karadeniz Technical University)"
] |
The receding contact problem for two elastic layers whose elastic constants and heights are different supported by two elastic quarter planes is considered. The lower layer is supported by two elastic quarter planes and the upper elastic layer is subjected to symmetrical distributed load whose heights are 2a on its top surface. It is assumed that the contact between all surfaces is frictionless and the effect of gravity force is neglected. The problem is formulated and solved by using Theory of Elasticity and Integral Transform Technique. The problem is reduced to a system of singular integral equations in which contact pressures are the unknown functions by using integral transform technique and boundary conditions of the problem. Stresses and displacements are expressed depending on the contact pressures using Fourier and Mellin formula technique. The singular integral equation is solved numerically by using Gauss-Jacobi integration formulation. Numerical results are obtained for various dimensionless quantities for the contact pressures and the contact areas are presented in graphics and tables.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001812607
|
oai_dc
|
Buckling analysis of linearly tapered micro-columns based on strain gradient elasticity
|
Buckling analysis of linearly tapered micro-columns based on strain gradient elasticity
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Bekir Akgöz(Akdeniz University); Ö mer Civalek(Akdeniz University)"
] |
The buckling problem of linearly tapered micro-columns is investigated on the basis of modified strain gradient elasticity theory. Bernoulli-Euler beam theory is used to model the non-uniform micro column. Rayleigh-Ritz solution method is utilized to obtain the critical buckling loads of the tapered cantilever micro-columns for different taper ratios. Some comparative results for the cases of rectangular and circular cross-sections are presented in graphical and tabular form to show the differences between the results obtained by modified strain gradient elasticity theory and those achieved by modified couple stress and classical theories. From the results, it is observed that the differences between critical buckling loads achieved by classical and those predicted by non-classical theories are considerable for smaller values of the ratio of the micro-column thickness (or diameter) at its bottom end to the additional material length scale parameters and the differences also increase due to increasing of the taper ratio.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001812616
|
oai_dc
|
Development of strut-and-tie model and design guidelines for improved joint in decked bulb-tee bridge
|
Development of strut-and-tie model and design guidelines for improved joint in decked bulb-tee bridge
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lungui Li(Southwest Jiaotong University); Zhiqi He(Southeast University); Zhongguo John Ma(University of Tennessee Knoxville); Lingkan Yao(Southwest Jiaotong University)"
] |
This paper focuses on a development of strut-and-tie model (STM) to predict the capacity of an improved longitudinal joint for decked bulb-tee bridge systems. Nine reinforced concrete beam/slab specimens anchored by spliced headed bars with different details were tested. Test results were evaluated and compared with an anticipation of the validated STM. The proposed STM provides a lower bound of the ultimate capacity of the joint zone. It shows that the lap length of headed bars has a significant effect on structural behaviors of the improved joint. To develop a full strength joint, the range of the lap length can be determined by the strength and compatibility requirement. Design recommendations to spliced headed bars, concrete strength, as well as lacer bars in the joint zone are proposed for developing a full strength joint.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001812619
|
oai_dc
|
Inelastic lateral-torsional buckling strengths of stepped I-beams subjected to general loading condition
|
Inelastic lateral-torsional buckling strengths of stepped I-beams subjected to general loading condition
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"박종섭(상명대학교); Yi Seul Park(Sangmyung University)"
] |
The cross sections of multi-span beams are sometimes suddenly increased at the interior support of continuous beams to resist high negative moment. An earlier study on elastic lateral torsional buckling of stepped beams was conducted to propose new design equations. This research aims to continue the earlier study by considering the effect of inelastic buckling of stepped beams subjected to pure bending and general loading condition. A three-dimensional finite element-program ABAQUS and a statistical program MINITAB were used in the development of new design equations. The inelastic lateral torsional buckling strengths of 36 and 27 models for singly and doubly stepped beams, respectively, were investigated. The general loading condition consists of 15 loading cases based on the number of inflection point within the unbraced length of the stepped beams. The combined effects of residual stresses and geometrical imperfection were also considered to evaluate the inelastic buckling strengths. The proposed equations in this study will definitely improve current design methods for the inelastic lateral-torsional buckling of stepped beams and will increase efficiency in building and bridge design.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001812600
|
oai_dc
|
Numerical simulation of shaking table tests on 3D reinforced concrete structures
|
Numerical simulation of shaking table tests on 3D reinforced concrete structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Beyhan Bayhan(Bursa Technical University)"
] |
The current paper presents the numerical blind prediction of nonlinear seismic response of two full-scale, three dimensional, one-story reinforced concrete structures subjected to bidirectional earthquake simulations on shaking table. Simulations were carried out at the laboratories of LNEC (Laboratorio Nacional de Engenharia Civil) in Lisbon, Portugal. The study was motivated by participation in the blind prediction contest of shaking table tests, organized by the challenge committee of the 15th World Conference on Earthquake Engineering. The test specimens, geometrically identical, designed for low and high ductility levels, were subjected to subsequent earthquake motions of increasing intensity. Three dimensional nonlinear analytical models were implemented and subjected to the input base motions. Reasonably accurate reproduction of the measured displacement response was obtained through appropriate modeling. The goodness of fit between analytical and measured results depended on the details of the analytical models.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001812618
|
oai_dc
|
Rapid seismic performance assessment method for one story hinged precast buildings
|
Rapid seismic performance assessment method for one story hinged precast buildings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mehmet Palanci(Pamukkale University); Sevket Murat Senel(Pamukkale University)"
] |
In this study, seismic performance of one story hinged precast buildings, which represents the majority of existing lightweight industrial building stock of Turkey, was assessed. A lot of precast buildings, constructed in one of the important seismic zones of western Turkey, were investigated and building inventories were prepared. By this method, structural properties of inventory buildings and damaged precast buildings in recent earthquakes were compared. Damage estimations based on nonlinear analysis methods have shown that estimated damage levels of inventory buildings and observed damage levels in recent earthquakes are similar. Accuracy of damage estimation study and the simplicity of the one story precast building models implied that rapid seismic performance assessment method for these buildings can be developed. In this assessment method, capacity curves and vibration periods of precast buildings were calculated by using structural properties of precast buildings. The proposed assessment method was applied to inventory buildings by using two different seismic demand scenarios which reflect moderate and soft soil conditions. Comparison of detailed analysis and rapid assessment methods have indicated that reliable seismic performance estimations can be performed by using proposed method. It is also observed that distribution of damage estimations is compatible in both scenarios.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001812605
|
oai_dc
|
Effective number of mega-bracing, in order to minimize shear lag
|
Effective number of mega-bracing, in order to minimize shear lag
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Rouzbeh Zahiri-Hashemi(Semnan University); Ali Kheyroddin(Semnan University); Basir Farhadi(Islamic Azad University)"
] |
In this paper, influence of geometric configurations of multi-story bracing on shear lag behaviour of braced tube structures is investigated. The shear lag of 24-, 36- and 72-story braced tube structures are assessed considering all possible configurations of overall X and Chevron bracing types. Based on the analytical results, empirical equations, useful for the preliminary design phase, are proposed to provide the optimum number of stories that braced, in order to exert minimum shear lag on structures. Studying the interaction behaviour of a tube and different bracing types along with paying attention to the shear lag behaviour, a better explanation about the reasons behind the efficiency of a specific bracing module in decreasing the shear lag is developed. The analytical results show that there are distinct differences between the anatomy of braced tube structures with X and Chevron bracing regarding the shear lag behaviour.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001811978
|
oai_dc
|
Buckling of thin-walled members analyzed by Mindlin-Reissner finite strip
|
Buckling of thin-walled members analyzed by Mindlin-Reissner finite strip
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Bui H. Cuong(National University of Civil Engineering)"
] |
The paper presents the formulation of 3-nodal line semi-analytical Mindlin-Reissner finite strip in the buckling analysis of thin-walled members, which are subjected to arbitrary loads. The finite strip is simply supported in two opposite edges. The general loading and in-plane rotation techniques are used to develop this finite strip. The linear stiffness matrix and the geometric stiffness matrix of the finite strip are given in explicit forms. To validate the proposed model and study its performance, numerical examples of some thin-walled sections have been performed and the results obtained have been compared with finite element models and the published ones.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001811979
|
oai_dc
|
Optimization of a sandwich beam design: analytical and numerical solutions
|
Optimization of a sandwich beam design: analytical and numerical solutions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ziad K. Awad(University of Mosul)"
] |
An optimization work was developed in this work to provide design information for sandwich beam in civil engineering applications. This research is motivated by the wide-range applications of sandwich structures such as; slab, beam, girder, and railway sleeper. The design of a sandwich beam was conducted by using analytical and numerical optimization. Both analytical and numerical procedures consider the optimum design with structure mass objective minimization. Allowable deflection was considered as design constraints. It was found that the optimized core to the skins mass ratio is affected by the skin to core density and elastic modulus ratios. Finally, the optimum core to skin mass ratio cannot be constant for different skin and core materials.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001811977
|
oai_dc
|
A numerical investigation of seismic performance of large span single-layer latticed domes with semi-rigid joints
|
A numerical investigation of seismic performance of large span single-layer latticed domes with semi-rigid joints
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Huidong Zhang(Tianjin Chengjian University); Qinghua Han(Tianjin University)"
] |
It is still inadequate for investigating the highly nonlinear and complex mechanical behaviors of single-layer latticed domes by only performing a force-based demand-capacity analysis. The energy-based balance method has been largely accepted for assessing the seismic performance of a structure in recent years. The various factors, such as span-to-rise ratio, joint rigidity and damping model, have a remarkable effect on the load-carrying capacity of a single-layer latticed dome. Therefore, it is necessary to determine the maximum load-carrying capacity of a dome under extreme loading conditions. In this paper, a mechanical model for members of the semi-rigidly jointed single-layer latticed domes, which combines fiber section model with semi-rigid connections, is proposed. The static load-carrying capacity and seismic performance on the single-layer latticed domes are evaluated by means of the mechanical model. In these analyses, different geometric parameters, joint rigidities and roof loads are discussed. The buckling behaviors of members and damage distribution of the structure are presented in detail. The sensitivity of dynamic demand parameters of the structures subjected to strong earthquakes to the damping is analyzed. The results are helpful to have a better understanding of the seismic performance of the single-layer latticed domes.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001811972
|
oai_dc
|
Prediction of through the width delamination growth in post-buckled laminates under fatigue loading using de-cohesive law
|
Prediction of through the width delamination growth in post-buckled laminates under fatigue loading using de-cohesive law
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hossein Hosseini-Toudeshky(Amirkabir University of Technology); M. Saeed Goodarzi(Amirkabir University of Technology); Bijan Mohammadi(Iran University of Science and Technology)"
] |
Initiation and growth of delamination is a great concern of designers of composite structures. Interface elements with de-cohesive constitutive law in the content of continuum damage mechanics can be used to predict initiation and growth of delamination in single and mixed mode conditions. In this paper, an interface element based on the cohesive zone method has been developed to simulate delaminatoin growth of post-buckled laminate under fatigue loading. The model was programmed as the user element and user material by the “User Programmable Features” in ANSYS finite element software. The interface element is a three-dimensional 20 node brick with small thickness. Because of mixed-mode condition of stress field at the delamination-front of post-buckled laminates, a mixed-mode bilinear constitutive law has been used as user material in this model. The constitutive law of interface element has been verified by modelling of a single element. A composite laminate with initial delamination under quasi-static compressive Loading available from literature has been remodeled with the present approach. Moreover, it will be shown that, the closer the delamination to the free surface of laminate, the slower the delamination growth under compressive fatigue loading. The effects of laminate configuration on delamination growth are also investigated.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001811997
|
oai_dc
|
Combination of isogeometric analysis and extended finite element in linear crack analysis
|
Combination of isogeometric analysis and extended finite element in linear crack analysis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Shojaee(Shahid Bahonar University); M. Ghelichi(Graduate University Of Technology); E. Izadpanah(Shahid Bahonar University)"
] |
This paper intends to present an application of isogeometric analysis in crack problems. An isogeometric formula is developed based on NURBS basis functions - enriched and adopted via X-FEM enrichment functions. The proposed method which is represented by the combination of the two abovementioned methods, first by using NURBS functions models the geometry exactly and then by defining level set function on domain, identifies available discontinuity in elements. Additional DOFs are allocated to elements containing the crack and X-FEM enrichment functions enrich approximate solution. Moreover, a subelement refinement technique is used to improve the accuracy of integration by the Gauss quadrature rule. Finally, several numerical examples are illustrated to demonstrate the effectiveness, robustness and accuracy of the proposed method during calculation of crack parameters.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001811980
|
oai_dc
|
Hygrothermal effects on dynamic instability of a laminated plate under an arbitrary pulsating load
|
Hygrothermal effects on dynamic instability of a laminated plate under an arbitrary pulsating load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hai Wang(Ming Chi University of Technology); Chun-Sheng Chen(Lunghwa University of Science and Technology); Chin-Ping Fung(Oriental Institute of Technology)"
] |
This paper studies the static and dynamic characteristics of composite plates subjected to an arbitrary periodic load in hygrothermal environments. The material properties of composite plates are depended on the temperature and moisture. The governing equations of motion of Mathieu-type are established by using the Galerkin method with reduced eigenfunction transforms. A periodic load is taken to be a combination of axial pulsating load and bending stress in the example problem. The regions of dynamic instability of laminated composite plates are determined by solving the eigenvalue problems based on Bolotin’s method. The effects of temperature rise and moisture concentration on the dynamic instability of laminated composite plates are investigated and discussed. The influences of various parameters on the instability region and dynamic instability index are also investigated. The numerical results reveal that the influences of hygrothermal effect on the dynamic instability of laminated plates are significant.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001811971
|
oai_dc
|
A smeared crack model for seismic failure analysis of concrete gravity dams considering fracture energy effects
|
A smeared crack model for seismic failure analysis of concrete gravity dams considering fracture energy effects
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Amin Hariri-Ardebili(University of Colorado at Boulder); Seyed Mahdi Seyed-Kolbadi(K. N. Toosi University of Technology); Hasan Mirzabozorg(K. N. Toosi University of Technology)"
] |
In the present paper, a coaxial rotating smeared crack model is proposed for mass concrete in three-dimensional space. The model is capable of applying both the constant and variable shear transfer coefficients in the cracking process. The model considers an advanced yield function for concrete failure under both static and dynamic loadings and calculates cracking or crushing of concrete taking into account the fracture energy effects. The model was utilized on Koyna Dam using finite element technique. Damwater and dam-foundation interactions were considered in dynamic analysis. The behavior of dam was studied for different shear transfer coefficients considering/neglecting fracture energy effects. The results were extracted at crest displacement and crack profile within the dam body. The results show the importance of both shear transfer coefficient and the fracture energy in seismic analysis of concrete dams under high hydrostatic pressure.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001811969
|
oai_dc
|
Seismic response analysis of reinforced concrete frames including soil flexibility
|
Seismic response analysis of reinforced concrete frames including soil flexibility
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"B.R. Jayalekshmi(National Institute of Technology Karnataka); V.G. Deepthi Poojary(National Institute of Technology Karnataka); Katta Venkataramana(National Institute of Technology Karnataka); R. Shivashankar(National Institute of Technology Karnataka)"
] |
The seismic response of RC space frame structures with isolated footing resting on a shallow soil stratum on rock is presented in this paper. Homogeneous soil stratum of different stiffness in the very soft to stiff range is considered. Soil, footing and super structure are considered to be the parts of an integral system. A finite element model of the integrated system is developed and subjected to scaled acceleration time histories recorded during two different real earthquakes. Dynamic analysis is performed using mode superposition method of transient analysis. A parametric study is conducted to investigate the effect of flexibility of soil in the dynamic behaviour of low- rise building frames. The time histories and Fourier spectra of roof displacement, base shear and structural response quantities of the space frame on compliant base are presented and compared with the fixed base condition. Results indicate that the incorporation of soil flexibility is required for the realistic estimate of structural seismic response especially for single storey structures resting on very soft soil.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001739463
|
oai_dc
|
Analysis of structural dynamic reliability based on the probability density evolution method
|
Analysis of structural dynamic reliability based on the probability density evolution method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yongfeng Fang(Xidian University); Jianjun Chen(Xidian University); Kong Fah Tee(University of Greenwich)"
] |
A new dynamic reliability analysis of structure under repeated random loads is proposed in this paper. The proposed method is developed based on the idea that the probability density of several times random loads can be derived from the probability density of single-time random load. The reliability prediction models of structure based on time responses under several times random loads with and without strength degradation are obtained by using the stress-strength interference theory and probability density evolution method. The resulting differential equations in the prediction models can be solved by using the forward finite difference method. Then, the probability density functions of strength redundancy of the structures can be obtained. Finally, the structural dynamic reliability can be calculated using integral method.
The efficiency of the proposed method is demonstrated numerically through a speed reducer. The results have shown that the proposed method is practicable, feasible and gives reasonably accurate prediction.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001739466
|
oai_dc
|
Seismic design of steel frames using multi-objective optimization
|
Seismic design of steel frames using multi-objective optimization
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Kaveh(Iran University of Science and Technology); I. Shojaei(University of Tehran); Y. Gholipour(University of Tehran); H. Rahami(University of Tehran)"
] |
In this study a multi-objective optimization problem is solved. The objectives used here include simultaneous minimum construction cost in term of sections weight, minimum structural damage using a damage index, and minimum non-structural damage in term of inter-story drift under the applied ground motions. A high-speed and low-error neural network is trained and employed in the process of optimization to estimate the results of non-linear time history analysis. This approach can be utilized for all steel or concrete frame structures. In this study, the optimal design of a planar eccentric braced steel frame is performed with great detail, using the presented multi-objective algorithm with a discrete population and then a moment resisting frame is solved as a supplementary example.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001739450
|
oai_dc
|
Static and free vibration analysis of shallow sagging inclined cables
|
Static and free vibration analysis of shallow sagging inclined cables
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zhi-Jiang Li(Central South University); Peng Li(China ship development and design center); Zeng He(Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment); Ping Cao(Central South University)"
] |
Based on link-model, we conducted a static analysis and computation of a three-span suspended cable structure in the present paper, and obtained the static configuration and tension distribution of the cable. Using the link and beam model based on finite element method, we analyzed the vibration modal of three-span suspended cable structure, and compared with the results obtained from ANSYS using link and beam element. The vibration modals of shallow sagging inclined cables calculated from proposed method agrees well with ANSYS results, which validates the proposed method. As a result, the influence of bend stiffness on in-plane natural frequencies is much greater than that on out-of-plane natural frequencies of inclined cables.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001739458
|
oai_dc
|
Analysis of elastic foundation plates with internal and perimetric stiffening beams on elastic foundations by using Finite Differences Method
|
Analysis of elastic foundation plates with internal and perimetric stiffening beams on elastic foundations by using Finite Differences Method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"C.J. Orbanich(Universidad Nacional del Sur); N.F. Ortega(Universidad Nacional del Sur)"
] |
The mechanical behavior of rectangular foundation plates with perimetric beams and internal stiffening beams of the plate is herein analyzed, taking the foundation design into account. A series of dimensionless parameters related to the geometry of the studied elements were defined. In order to generalize the problem statement, an initial settlements was considered. A numeric procedure was developed for the resolution by means of the Finite Differences Method that takes into account the stiffness of the plate, the perimetric and internal plate beams and the soil reaction module. Iterative algorithms were employed which, for each of the analyzed cases, made it possible to find displacements and reaction percentages taken by the plate and those that discharge directly into the perimetric beams, practically without affecting the plate. To enhance its mechanical behavior the internal stiffening beams were prestressed and the results obtained with and without prestressing were compared. This analysis was made considering the load conditions and the soil reaction module constant.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001739460
|
oai_dc
|
Analysis of trusses by total potential optimization method coupled with harmony search
|
Analysis of trusses by total potential optimization method coupled with harmony search
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yusuf Cengiz Toklu(Bayburt University); Gebrail Bekdaşa(Istanbul University); Rasim Temur(Istanbul University)"
] |
Current methods of analysis of trusses depend on matrix formulations based on equilibrium equations which are in fact derived from energy principles, and compatibility conditions. Recently it has been shown that the minimum energy principle, by itself, in its pure and unmodified form, can well be exploited to analyze structures when coupled with an optimization algorithm, specifically with a meta-heuristic algorithm. The resulting technique that can be called Total Potential Optimization using Meta-heuristic Algorithms (TPO/MA) has already been applied to analyses of linear and nonlinear plane trusses successfully as coupled with simulated annealing and local search algorithms. In this study the technique is applied to both 2-dimensional and 3-dimensional trusses emphasizing robustness, reliability and accuracy. The trials have shown that the technique is robust in two senses: all runs result in answers, and all answers are acceptable as to the reliability and accuracy within the prescribed limits. It has also been shown that Harmony Search presents itself as an appropriate algorithm for the purpose.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001739471
|
oai_dc
|
Free vibration of symmetric angle-ply layered conical shell frusta of variable thickness under shear deformation theory
|
Free vibration of symmetric angle-ply layered conical shell frusta of variable thickness under shear deformation theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K.K.Viswanathan(Universiti Teknologi Malaysia); Saira Javed(Universiti Teknologi Malaysia); Zainal Abdul Aziz(Universiti Teknologi Malaysia)"
] |
Free vibration of symmetric angle-ply layered conical shell frusta of variable thickness is analyzed under shear deformation theory with different boundary conditions by applying collocation with spline approximation. Linear and exponential variation in thickness of layers are assumed in axial direction.
Displacements and rotational functions are approximated by Bickley-type splines of order three and obtained a generalized eigenvalue problem. This problem is solved numerically for an eigenfrequency parameter and an associated eigenvector of spline coefficients. The vibration of three and five–layered conical shells, made up of two different type of materials are considered. Parametric studies are made for analysing the frequencies of the shell with respect to the coefficients of thickness variations, length-to-radius ratio, length-to-thickness ratio and ply angles with different combination of the materials. The results are compared with the available data and new results are presented in terms of tables and graphs.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001739468
|
oai_dc
|
Yield displacement profiles of asymmetric structures for optimum torsional response
|
Yield displacement profiles of asymmetric structures for optimum torsional response
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"George K. Georgoussis(School of Pedagogical and Technological Education)"
] |
Given the yield shear of a single-story inelastic structure with simple eccentricity, the problem of strength distribution among the resisting elements is investigated, with respect to minimize its torsional response during a ground motion. Making the hypothesis that the peak accelerations, of both modes of vibration, are determined from the inelastic acceleration spectrum, and assuming further that a peak response quantity is obtained by an appropriate combination rule (square root of sum of squares-SRSS or complete quadratic combination-CQC), the first aim of this study is to present an interaction relationship between the yield shear and the maximum torque that may be developed in such systems. It is shown that this torque may be developed, with equal probability, in both directions (clockwise and anticlockwise), but as it is not concurrent with the yield shear, a rational design should be based on a combination of the yield shear with a fraction of the peak torque. The second aim is to examine the response of such model structures under characteristic ground motions. These models provide a rather small peak rotation and code provisions that are based on such principles (NBCC-1995, UBC-1994, EAK-2000, NZS-1992) are superiors to EC8 (1993) and to systems with a stiffness proportional strength distribution.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001739456
|
oai_dc
|
A review on recent development of vibration-based structural robust damage detection
|
A review on recent development of vibration-based structural robust damage detection
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Y.Y. Li(The Chinese University of Hong Kong); Y. Chen(University of Electronic Science and Technology of China)"
] |
The effect of structural uncertainties or measurement errors on damage detection results makes the robustness become one of the most important features during identification. Due to the wide use of vibration signatures on damage detection, the development of vibration-based techniques has attracted a great interest. In this work, a review on vibration-based robust detection techniques is presented, in which the robustness is considerably improved through modeling error compensation, environmental variation reduction, denoising, or proper sensing system design. It is hoped that this study can give help on structural health monitoring or damage mitigation control.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001660739
|
oai_dc
|
Behavior of high-strength fiber reinforced concrete plates under in-plane and transverse loads
|
Behavior of high-strength fiber reinforced concrete plates under in-plane and transverse loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ramadoss, P.(Pondicheery Engineering College); Nagamani, K.(Anna University)"
] |
The concrete plates are most widely used structural elements in the hulls of floating concrete structures such as concrete barges and pontoons, bridge decks, basement floors and liquid storage tanks. The study on the behavior of high-strength fiber reinforced concrete (HSFRC) plates was carried out to
evaluate the performance of plates under in-plane and transverse loads. The plates were tested in simply supported along all the four edges and subjected to in-plane and traverse loads. In this experimental program, twenty four 150 mm diameter cylinders and twelve plate elements of size 600 × 600 × 30 mm were prepared and tested. Water-to-cementitious materials ratios of 0.3 and 0.4 with 10% and 15% silica fume replacements were used in the concrete mixes. The fiber volume fractions, Vf = 0%, 1% and 1.5% with an aspect ratio of 80 were used in this study. The HSFRC mixes had the concrete ompressive
strengths in the range of 52.5 to 70 MPa, flexural strengths ranging from 6.21 to 11.08 MPa and static modulus of elasticity ranging from 29.68 to 36.79 GPa. In this study, the behavior of HSFRC plate elements subjected to combined uniaxial in-plane and transverse loads was investigated.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000073.xml
|
||
ART001660745
|
oai_dc
|
Optimal design of composite laminates for minimizing delamination stresses by particle swarm optimization combined with FEM
|
Optimal design of composite laminates for minimizing delamination stresses by particle swarm optimization combined with FEM
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jianqiao Chen(Huazhong University of Science and Technology); Wenjie Peng(Huazhong University of Science and Technology); Junhong Wei(Huazhong Univ. of Sci. and Tech.); Rui Ge(Huazhong University of Science and Technology)"
] |
The present paper addresses the optimal design of composite laminates with the aim of minimizing free-edge delamination stresses. A technique involving the application of particle swarm optimization (PSO) integrated with FEM was developed for the optimization. Optimization was also conducted with the zero-order method (ZOM) included in ANSYS. The semi-analytical method, which provides an approximation of the interlaminar normal stress of laminates under in-plane load, was used to partially validate the optimization results. It was found that optimal results based on ZOM are sensitive to the starting design points, and an unsuitable initial design set will lead to a result far from global solution. By contrast, the proposed method can find the global optimal solution regardless of initial designs, and the solutions were better than those obtained by ZOM in all the cases investigated.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000073.xml
|
||
ART001660751
|
oai_dc
|
Free vibration of axially loaded Reddy-Bickford beam on elastic soil using the differential transform method
|
Free vibration of axially loaded Reddy-Bickford beam on elastic soil using the differential transform method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yusuf Yesilce(Dokuz Eylul University); Seval Catal(Dokuz Eylul University)"
] |
The literature regarding the free vibration analysis of Bernoulli-Euler and Timoshenko beams on elastic soil is plenty, but the free vibration analysis of Reddy-Bickford beams on elastic soil with/ without axial force effect using the Differential Transform Method (DTM) has not been investigated by any of the studies in open literature so far. In this study, the free vibration analysis of axially loaded Reddy-Bickford beam on elastic soil is carried out by using DTM. The model has six degrees of freedom at the two ends, one transverse displacement and two rotations, and the end forces are a shear force and
two end moments in this study. The governing differential equations of motion of the rectangular beam in free vibration are derived using Hamilton’s principle and considering rotatory inertia. Parameters for the relative stiffness, stiffness ratio and nondimensionalized multiplication factor for the axial compressive
force are incorporated into the equations of motion in order to investigate their effects on the natural frequencies. At first, the terms are found directly from the analytical solutions of the differential equations that describe the deformations of the cross-section according to the high-order theory. After the analytical
solution, an efficient and easy mathematical technique called DTM is used to solve the governing differential equations of the motion. The calculated natural frequencies of one end fixed and the other end simply supported Reddy-Bickford beam on elastic soil using DTM are tabulated in several tables and
figures and are compared with the results of the analytical solution where a very good agreement is observed and the mode shapes are presented in graphs.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000073.xml
|
||
ART001660753
|
oai_dc
|
Dynamic response of a beam supported with damper under moving load
|
Dynamic response of a beam supported with damper under moving load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Murat Reis(Uludag University); Ya ar Pala(Uludag University)"
] |
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000073.xml
|
|||
ART001660747
|
oai_dc
|
Analytical modeling of masonry infills with openings
|
Analytical modeling of masonry infills with openings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"D. Kakaletsis(Technological Educational Institution of Serres)"
] |
In order to perform a step-by-step force-displacement response analysis or dynamic timehistory analysis of large buildings with masonry infilled R/C frames, a continuous force-deformation model based on an equivalent strut approach is proposed for masonry infill panels containing openings.
The model, which is applicable for degrading elements, can be implemented to replicate a wide range of monotonic force-displacement behaviour, resulting from different design and geometry, by varying the control parameters of the model. The control parameters of the proposed continuous model are determined using experimental data. The experimental program includes fifteen 1/3-scale, single-story, single-bay reinforced concrete frame specimens subjected to lateral cyclic loading. The parameters investigated include the shape, the size, the location of the opening and the infill compressive strength. The actual properties of the infill and henceforth the characteristics needed for the diagonal strut model are based on the assessment of its lateral resistance by the subtraction of the response of the bare frame from the
response of the infilled frame.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000073.xml
|
||
ART001660742
|
oai_dc
|
Convergence studies on static and dynamic analysis of beams by using the U-transformation method and finite difference method
|
Convergence studies on static and dynamic analysis of beams by using the U-transformation method and finite difference method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Y. Yang(South China University of Technology); M. Cai(Zhongshan University); J. K. Liu(Zhongshan University)"
] |
The static and dynamic analyses of simply supported beams are studied by using the Utransformation method and the finite difference method. When the beam is divided into the mesh of equal elements, the mesh may be treated as a periodic structure. After an equivalent cyclic periodic system is established, the difference governing equation for such an equivalent system can be uncoupled by applying the U-transformation. Therefore, a set of single-degree-of-freedom equations is formed. These equations can be used to obtain exact analytical solutions of the deflections, bending moments, buckling
loads, natural frequencies and dynamic responses of the beam subjected to particular loads or excitations. When the number of elements approaches to infinity, the exact error expression and the exact convergence rates of the difference solutions are obtained. These exact results cannot be easily derived if other methods are used instead.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000073.xml
|
||
ART001660743
|
oai_dc
|
Optimization of a telescope movable support structure by means of Volumetric Displacements
|
Optimization of a telescope movable support structure by means of Volumetric Displacements
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Néstor F. Ortega(Universidad Nacional del Sur-Av); Sandra I. Robles(Universidad Nacional del Sur-Av)"
] |
The Purpose of this paper is to show the applicability of a methodology, developed by the authors, with which to perform the mechanical optimization of space truss structures strongly restricted. This methodology use a parameter call “Volumetric Displacement”, as the Objective Function of the
optimization process. This parameter considers altogether the structure weight and deformation whose effects are opposed. The Finite Element Method is employed to calculate the stress/strain state and the
natural frequency of the structure through a structural linear static and natural frequency analysis. In order to show the potentially of this simple methodology, its application on a large diameter telescope structure
(10 m) considering the strongly restriction that became of its use, is presented. This methodology, applied in previous works on continuous structures, such as shell roof and fluid storage vessels, is applied in this
case to a space truss structure, with the purpose of generalize its applicability to different structural topology. This technique could be useful in the morphology design of deployable and retractable roof
structures, whose use has extensively spread in the last years.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000073.xml
|
||
ART001660749
|
oai_dc
|
Hybrid displacement FE formulations including a hole
|
Hybrid displacement FE formulations including a hole
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Nicolas Leconte(The French Aerospace Lab (ONERA)); Bertrand Langrand(The French Aerospace Lab (ONERA)); Eric Markiewicz(University of Valenciennes)"
] |
The paper deals with the problem related to the modelling of riveted assemblies for crashworthiness analysis of full-scale complete aircraft structures. Comparisons between experiments and standard FE computations on high-energy accidental situations onto aluminium riveted panels show that
macroscopic plastic strains are not sufficiently localised in the FE shells connected to rivet elements. The main reason is related to the structural embrittlement caused by holes, which are currently not modelled. Consequently, standard displacement FE models do not succeed in initialising and propagating the rupture in sheet metal plates and along rivet rows as observed in the experiments. However, the literature survey
show that it is possible to formulate super-elements featuring defects that both give accurate singular strain fields and are compatible with standard displacement finite elements. These super-elements can be related to the displacement model of the hybrid-Trefftz principle of the finite element method, which is a kind of domain decomposition method. A feature of hybrid-Trefftz finite elements is that they are mainly used for elastic computations. It is thus proposed to investigate the possibility of formulating a hybrid displacement finite element, including the effects of a hole, dedicated to crashworthiness analysis of fullscale aeronautic structures.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000073.xml
|
||
ART001820247
|
oai_dc
|
Finite element analysis of helmeted oblique impacts and head injury evaluation with a commercial road helmet
|
Finite element analysis of helmeted oblique impacts and head injury evaluation with a commercial road helmet
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Fábio A.O. Fernandes(University of Aveiro); R.J. Alves de Sousa(University of Aveiro)"
] |
In this work, the safety performance of a commercial motorcycle helmet already placed on the market is assessed. The assessed motorcycle helmet is currently homologated by several relevant motorcycle standards. Impacts including translational and rotational motions are accurately simulated through a finite element numerical framework. The developed model was validated against experimental results: firstly, a validation concerning the constitutive model for the expanded polystyrene, the material responsible for energy absorption during impact; secondly, a validation regarding the acceleration measured at the headform's centre of gravity during the linear impacts defined in the ECE R22.05 standard. Both were successfully validated. After model validation, an oblique impact was simulated and the results were compared against head injury thresholds in order to predict the resultant head injuries. From this comparison, it was concluded that brain injuries such as concussion and diffuse axonal injury may occur even with a helmet certified by the majority of the motorcycle helmet standards. Unfortunately, these standards currently do not contemplate rotational components of acceleration. Conclusion points out to a strong recommendation on the necessity of including rotational motion in forthcoming motorcycle helmet standards and improving the current test procedures and head injury criteria used by the standards, to improve the safety between the motorcyclists.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001820252
|
oai_dc
|
New implicit higher order time integration for dynamic analysis
|
New implicit higher order time integration for dynamic analysis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Javad Alamatian(Islamic Azad University)"
] |
In this paper new implicit time integration called N-IHOA is presented for dynamic analysis of high damping systems. Here, current displacement and velocity are assumed to be functions of the velocities and accelerations of several previous time steps, respectively. This definition causes that only one set of weighted factors is calculated from the Taylor series expansion which leads to a simple approach and reduce the computational efforts. Moreover a comprehensive study on stability of the proposed method i.e., NIHOA compared with IHOA integration which is performed based on amplification matrices proves the ability of the N-IHOA in high damping vibrations such as control systems. Also, wide range of numerical examples which contains single/multi degrees of freedom, damped/un-damped, free/forced vibrations from finite element/finite difference demonstrate that the accuracy and efficiency of the proposed time integration is more than the common approaches such as the IHOA, the Wilson-ζ and the Newmark-β.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001820244
|
oai_dc
|
Conceptual design of prestressed slab bridges through one-way flexural load balancing
|
Conceptual design of prestressed slab bridges through one-way flexural load balancing
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Marcello Arici(Università di Palermo); Michele Fabio Granata(Università di Palermo)"
] |
In this paper a study on prestressed concrete slab bridges is presented. A design philosophy based on the concept of load balancing through prestressing is proposed in order to minimize the effects of delayed deformations due to creep. Aspects related to the stress redistribution inside these bridges for timedependent phenomena are analyzed and discussed, by applying the principles of aging linear visco-elasticity.
Prestressing is seen as an equivalent external load which counterbalances the permanent loads applied to the bridge, nullifying the elastic deflections due to sustained loads, and thus avoiding the related delayed deformations. An optimization of the structural behavior through the use of one-way prestressing is achieved. The determination of a convenient variable depth of slab bridges and the correspondent layout of tendons is considered as a useful means for applying the load balancing concept in actual cases of structures like long cantilevers or bridge decks. A case-study related to the slab bridges built 30 years ago at Jeddah in Saudi Arabia is presented and discussed, in order to show the effectiveness of the proposed approach to the conceptual design of prestressed concrete bridges.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001820242
|
oai_dc
|
A 3D co-rotational beam element for steel and RC framed structures
|
A 3D co-rotational beam element for steel and RC framed structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xu Long(Nanyang Technological University); Kang Hai Tan(Nanyang Technological University); Chi King Lee(Nanyang Technological University)"
] |
A 3-node 3D co-rotational beam element using vectorial rotational variables is employed to consider the geometric nonlinearity in 3D space. To account for shape versatility and reinforced concrete cross-sections, fibre model has been derived and conducted. Numerical integration over the cross-section is performed, considering both normal and shear stresses. In addition, the derivations associated with material nonlinearity are given in terms of elasto-plastic incremental stress-strain relationship for both steel and concrete. Steel reinforcement is treated as elasto-plastic material with Von Mises yield criterion. Compressive concrete behaviour is described by Modified Kent and Park model, while tensile stiffening effect is taken into account as well. Through several numerical examples, it is shown that the proposed 3D co-rotational beam element with fibre model can be used to simulate steel and reinforced concrete framed structures with satisfactory accuracy and efficiency.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001820248
|
oai_dc
|
Energy based procedure to obtain target displacement of reinforced concrete structures
|
Energy based procedure to obtain target displacement of reinforced concrete structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Massumi(Kharazmi University); B. Monavari(Kharazmi University)"
] |
Performance-based seismic design allows a structure to develop inelastic response during earthquakes. This modern seismic design requires more clearly defined levels of inelastic response. The ultimate deformation of a structure without total collapse (target displacement) is used to obtain the inelastic deformation capacity (inelastic performance). The inelastic performance of a structure indicates its performance under excitation. In this study, a new energy-based method to obtain the target displacement for reinforced concrete frames under cyclic loading is proposed. Concrete structures were analyzed using nonlinear static (pushover) analysis and cyclic loading. Failure of structures under cyclic loading was controlled and the new method was tested to obtain target displacement. In this method, the capacity energy absorption of the structures for both pushover and cyclic analyses were considered to be equal. The results were compared with FEMA-356, which confirmed the accuracy of the proposed method.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001820250
|
oai_dc
|
Study on modified differential transform method for free vibration analysis of uniform Euler-Bernoulli beam
|
Study on modified differential transform method for free vibration analysis of uniform Euler-Bernoulli beam
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zhifeng Liu(Beijing University of Technology); Yunyao Yin(Beijing University of Technology); Feng Wang(Beijing University of Technology); Yongsheng Zhao(Beijing University of Technology); Ligang Cai(Beijing University of Technology)"
] |
A simulation method called modified differential transform is studied to solve the free vibration problems of uniform Euler-Bernoulli beam. First of all, the modified differential transform method is derived. Secondly, the modified differential transformation is applied to uniform Euler-Bernoulli beam freefree vibration. And then a set of differential equations are established. Through algebraic operations on these equations, we can get any natural frequency and normalized mode shape. Thirdly, the FEM is applied to obtain the numerical solutions. Finally, mode experimental method (MEM) is conducted to obtain experimental data for analysis by signal processing with LMS Test.lab Vibration testing and analysis system. Experimental data and simulation results are illustrated to be in comparison with the analytical solutions. The results show that the modified differential transform method can achieve good results in predicting the solution of such problems.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001820253
|
oai_dc
|
Computational material modeling of masonry walls strengthened with fiber reinforced polymers
|
Computational material modeling of masonry walls strengthened with fiber reinforced polymers
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H. Orhun Köksal(Çanakkale 18 Mart University); Oktay Jafarov(Khazar University); Bilge Doran(Yıldız Technical University); Selen Aktan(Çanakkale 18 Mart University); Cengiz Karakoç(Boğaziçi University)"
] |
This paper aims to develop a practical approach to modeling of fiber reinforced polymers (FRP) strengthened masonry panels. The main objective is to provide suitable relations for the material characterization of the masonry constituents so that the finite element applications of elasto-plastic theory achieves a close fit to the experimental load-displacement diagrams of the walls subjected to in-plane shear and compression. Two relations proposed for masonry columns confined with FRP are adjusted for the cohesion and the internal friction angle of both units and mortar. Relating the mechanical parameters to the uniaxial compression strength and the hydrostatic pressure acting over the wall surface, the effects of major and intermediate principal stresses σ1 and σ2 on the yielding and the shape of the deviatoric section are then reflected into the analyses. Performing nonlinear finite element analyses (NLFEA) for the three walls tested in two different studies, their stress-strain response and failure modes are eventually evaluated through the comparisons with the experimental behavior.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001820245
|
oai_dc
|
Predicting the bond between concrete and reinforcing steel at elevated temperatures
|
Predicting the bond between concrete and reinforcing steel at elevated temperatures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Farhad Aslani(University of Technology Sydney); Bijan Samali(University of Technology Sydney)"
] |
Reinforced concrete structures are vulnerable to high temperature conditions such as those during a fire. At elevated temperatures, the mechanical properties of concrete and reinforcing steel as well as the bond between steel rebar and concrete may significantly deteriorate. The changes in the bonding behavior may influence the flexibility or the moment capacity of the reinforced concrete structures. The bond strength degradation is required for structural design of fire safety and structural repair after fire. However, the investigation of bonding between rebar and concrete at elevated temperatures is quite difficult in practice. In this study, bond constitutive relationships are developed for normal and high-strength concrete (NSC and HSC) subjected to fire, with the intention of providing efficient modeling and to specify the fireperformance criteria for concrete structures exposed to fire. They are developed for the following purposes at high temperatures: normal and high compressive strength with different type of aggregates, bond strength with different types of embedment length and cooling regimes, bond strength versus to compressive strength with different types of embedment length, and bond stress-slip curve. The proposed relationships at elevated temperature are compared with experimental results.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001632021
|
oai_dc
|
Determination of inclination of strut and shear strength using variable angle truss model for shear-critical RC beams
|
Determination of inclination of strut and shear strength using variable angle truss model for shear-critical RC beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Bing Li(Nanyang Technological University); Cao Thanh Ngoc Tran(Vietnam National University)"
] |
This paper attempts to determine the inclination of the compression strut within variable angle truss models for RC beams loaded in shear-flexure through a proposed semi-analytical approach. A truss unit is used to analyze a reinforced concrete beam, by the principle of virtual work under the truss analogy. The inclination of the compression strut is then theoretically derived. The concrete contribution is addressed by utilizing the compatibility condition within each truss unit. Comparisons are made between the predicted and published experimental results of the seventy one RC beams with respect to the shear strength and the inclined angle of the compression strut at this state to investigate the adequacy of the proposed semi-analytical approach.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001632024
|
oai_dc
|
Multi-axial strength criterion of lightweight aggregate (LWA) concrete under the Unified Twin-shear strength theory
|
Multi-axial strength criterion of lightweight aggregate (LWA) concrete under the Unified Twin-shear strength theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Li-cheng Wang(Dalian University of Technology)"
] |
The strength theory of concrete is significant to structure design and nonlinear finite element analysis of concrete structures because concrete utilized in engineering is usually subject to the action of multi-axial stress. Experimental results have revealed that lightweight aggregate (LWA) concrete exhibits plastic flow plateau under high compressive stress and most of the lightweight aggregates are crushed at this stage. For the purpose of safety, therefore, in the practical application the strength of LWA concrete at the plastic flow plateau stage should be regarded as the ultimate strength under multi-axial compressive stress state. With consideration of the strength criterion, the ultimate strength surface of LWA concrete under multi-axial stress intersects with the hydrostatic stress axis at two different points, which is completely different from that of the normal weight concrete as that the ultimate strength surface is openended. As a result, the strength criteria aimed at normal weight concrete do not fit LWA concrete. In the present paper, a multi-axial strength criterion for LWA concrete is proposed based on the Unified Twin-Shear Strength (UTSS) theory developed by Prof Yu (Yu et al. 1992), which takes into account the above strength characteristics of LWA under high compressive stress level. In this strength criterion model, the tensile and compressive meridians as well as the ultimate strength envelopes in deviatoric plane under different hydrostatic stress are established just in terms of a few characteristic stress states, i.e., the uniaxial tensile strength ft, the uniaxial compressive strength fc, and the equibiaxial compressive fbc. The developed model was confirmed to agree well with experimental data under different stress ratios of LWA concrete.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001632030
|
oai_dc
|
Sensitivity analysis of mechanical behaviors for bridge damage assessment
|
Sensitivity analysis of mechanical behaviors for bridge damage assessment
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ayaho Miyamoto(Yamaguchi University); Satoshi Isoda(Yamaguchi University)"
] |
The diagnosis of bridge serviceability is carried out by a combination of in-situ visual inspection, static and dynamic loading tests and analyses. Structural health monitoring (SHM) using information technology and sensors is increasingly being used for providing a better estimate of structural performance characteristics rather than above traditional methods. Because the mechanical behavior of bridges with various kinds of damage can not be made clear, it is very difficult to estimate both the damage mode and degree of damage of existing bridges. In this paper, the sensitivity of both static and dynamic behaviors of bridges are studied as a measure of damage assessment through experiments on model bridges induced with some specified artificial damages. And, a method of damage assessment of bridges based on those behaviors is discussed in detail. Finally, based on the results, a possible application for structural health monitoring systems for existing bridges is also discussed.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001632022
|
oai_dc
|
Seismic spectral acceleration assessment of masonry in-filled reinforced concrete buildings by a coefficient-based method
|
Seismic spectral acceleration assessment of masonry in-filled reinforced concrete buildings by a coefficient-based method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"R.K.L. Su(The University of Hong Kong); C.L. Lee(The University of Hong Kong); Y.P. Wang(National Chiao-Tung University)"
] |
This study explores a coefficient-based seismic capacity assessment method with a special emphasis on low-rise masonry in-filled (MI) reinforced concrete (RC) buildings subjected to earthquake motion. The coefficient-based method without requiring any complicated finite element analysis is a simplified procedure to assess the maximum spectral acceleration capacity of buildings. This paper first compares the fundamental periods of MI RC structures obtained, respectively, from experimental period data and empirical period-height formulas. The coefficient-based method for low-rise masonry buildings is then calibrated by the published experimental results obtained from shaking table tests. The comparison of the experimental and estimated results indicates that the simplified coefficient-based method can provide good approximations of the maximum spectral accelerations at peak loads of the low-rise masonry reinforced concrete buildings if a proper set of drift factors and initial fundamental vibration periods of structures are used.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001632025
|
oai_dc
|
Strain distribution between CFRP strip and concrete at strengthened RC beam against shear
|
Strain distribution between CFRP strip and concrete at strengthened RC beam against shear
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Özgür Anil(Gazi University); Nalan Bulut(Gazi University); Murat Ayhan(Gazi University)"
] |
In recent years, CFRP material usage in strengthening applications gradually became widespread. Especially, the studies on the strengthening of shear deficient reinforced concrete beams with CFRP strips are chosen as a subject to numerous experimental studies and research on this subject are increased rapidly. The most important variable, that is affected on the failure mode of CFRP strips and that is needed for determining the shear capacity of the strengthened reinforced concrete beams, is the strain distribution between CFRP strips and concrete. Numerous experimental studies are encountered in the literature about the determination of strain distribution between CFRP strips and concrete. However, these studies mainly focused on the CFRP strips under axial tension. There are very limited numbers of experimental and analytic studies examining the strain distribution between concrete and CFRP strips, which are under combined stresses due to the effects of shear force and bending moment. For this reason, existing experimental study in the literature is used as model for ANSYS finite element software. Nonlinear finite element analysis of RC beams strengthened against shear with CFRP strips under reverse cyclic loading is performed. The strain distributions between CFRP strips and concrete that is obtained from finite element analysis are compared with the results of experimental measurements. It is seen that the experimental results are consisted with the results derived from the finite element analysis and important findings on the strain distribution profile are reached by obtaining strain values of many points using finite element method.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001632033
|
oai_dc
|
Adaptive fluid-structure interaction simulation of large-scale complex liquid containment with two-phase flow
|
Adaptive fluid-structure interaction simulation of large-scale complex liquid containment with two-phase flow
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sung-Woo Park(Pusan National University); Jin-Rae Cho(Research and Development Institute of Midas IT)"
] |
An adaptive modeling and simulation technique is introduced for the effective and reliable fluid-structure interaction analysis using MSC/Dytran for large-scale complex pressurized liquid containment. The proposed method is composed of a series of the global rigid sloshing analysis and the locally detailed fluid-structure analysis. The critical time at which the system exhibits the severe liquid sloshing response is sought through the former analysis, while the fluid-structure interaction in the local region of interest at the critical time is analyzed by the latter analysis. Differing from the global coarse model, the local fine model considers not only the complex geometry and flexibility of structure but the effect of internal pressure. The locally detailed FSI problem is solved in terms of multi-material volume fractions and the flow and pressure fields obtained by the global analysis at the critical time are specified as the initial conditions. An in-house program for mapping the global analysis results onto the fine-scale local FSI model is developed. The validity and effectiveness of the proposed method are verified through an illustrative numerical experiment.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001632034
|
oai_dc
|
Nonlinear shear strength of pre-stressed concrete beams
|
Nonlinear shear strength of pre-stressed concrete beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Alireza Rahai(Amir Kabir University of Technology); A. Shokoohfar(Amir Kabir University of Technology)"
] |
The shear strength is an important factor in the design of prestressed concrete beams. Therefore, researchers have utilized various methods to determine the shear strength of these elements for the design purposes. To evaluate some of the proposed theoretical methods, numerous models of posttensioned beams with or without vertical prestressing are selected and analyzed using the finite element method and assuming nonlinear behavior for the materials. In this regard the validity of modeling is evaluated based on some tests results. In the second part of the study two beam specimens are built and tested and their load-deformation curve and cracking pattern are studied. The analytical results consist of compressive strut slope and mid span load deflection are compared with some experimental results, and the results of some codes’ formulas. Finally comparing the results of nonlinear analysis with the experimental values, a new formula is proposed for determining strut slopes in prestressed concrete beams.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001632028
|
oai_dc
|
Evaluation of accidental eccentricity for buildings by artificial neural networks
|
Evaluation of accidental eccentricity for buildings by artificial neural networks
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Badaoui(University of Djelfa); A. Chateauneuf(Université Blaise Pascal); E. Fournely(Université Blaise Pascal); N. Bourahla(University of Blida); M. Bensaïbi(University of Blida)"
] |
In seismic analyses of structures, additional eccentricity is introduced to take account for oscillations of random and unknown origins. In many codes of practice, the torsion about the vertical axis is considered through empirical accidental eccentricity formulation. Due to the random nature of structural systems, it is very difficult to evaluate the accidental eccentricity in a deterministic way and to specify its effect on the overall seismic response of structures. The aim of this study is to develop a procedure for the evaluation of the accidental eccentricity induced by uncertainties in stiffness and mass of structural members, using the neural network techniques coupled with Monte Carlo simulations. This method gives very interesting results for single story structures. For real structures, this method can be used as a tool to determine the accidental eccentricity in the seismic vulnerability studies of buildings.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001718012
|
oai_dc
|
Experimental work on seismic behavior of various types of masonry infilled RC frames
|
Experimental work on seismic behavior of various types of masonry infilled RC frames
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"I. Serkan Misir(Dokuz Eylul University); Ozgur Ozcelik(Dokuz Eylul University); Sadik Can Girgin(Dokuz Eylul University); Serap Kahraman(Dokuz Eylul University)"
] |
Reinforced concrete frame structures with masonry infill walls constitute the significant portion of the building stock in Turkey. Therefore it is very important to understand the behavior of masonry infill frame structures under earthquake loads. This study presents an experimental work performed on reinforced concrete (RC) frames with different types of masonry infills, namely standard and locked bricks. Earthquake effects are induced on the RC frames by quasi-static tests. Results obtained from different frames are compared with each other through various stiffness, strength, and energy related parameters. It is shown that locked bricks may prove useful in decreasing the problems related to horizontal and vertical irregularities defined in building codes. Moreover tests show that locked brick infills maintain their integrity up to very high drift levels, showing that they may have a potential in reducing injuries and fatalities related to falling hazards during severe ground shakings.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001718019
|
oai_dc
|
Strain-rate effects on interaction between Mode I matrix crack and inclined elliptic inclusion under dynamic loadings
|
Strain-rate effects on interaction between Mode I matrix crack and inclined elliptic inclusion under dynamic loadings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ying Li(Beijing Institute of Technology); Wan-Chao Qiu(Beijing Institute of Technology); Zhuo-Cheng Ou(Beijing Institute of Technology); Zhuo-Ping Duan(Beijing Institute of Technology); Feng-Lei Huang(Beijing Institute of Technology)"
] |
The strain rate effects on the interaction between a Mode I matrix crack and an inclined elliptic matrix-inclusion interface under dynamic tensile loadings were investigated numerically, and the results are in agreement with previous experimental data. It is found, for a given material system, that there are the first and the second critical strain rates, by which three kinds of the subsequent crack growth patterns can be classified in turn with the increasing strain rate, namely, the crack deflection, the double crack mode and the perpendicular crack penetration. Moreover, such a crack deflection/penetration behavior is found to be dependent on the relative interfacial strength, the inclined angle and the inclusion size. In addition, it is shown that the so-called strain rate effect on the dynamic strength of granule composites can be induced directly from the structural dynamic response of materials, not be entirely an intrinsic material property.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001718011
|
oai_dc
|
Experimental and numerical investigations on the ratcheting characteristics of cylindrical shell under cyclic axial loading
|
Experimental and numerical investigations on the ratcheting characteristics of cylindrical shell under cyclic axial loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Shariati(Shahrood University of Technology); H. Hatami(Shahrood University of Technology); H. Torabi(Islamic Azad University); H.R. Epakchi(Shahrood University of Technology)"
] |
The ratcheting characteristics of cylindrical shell under cyclic axial loading are investigated. The specimens are subjected to stress-controlled cycling with non-zero mean stress, which causes the accumulation of plastic strain or ratcheting behavior in continuous cycles. Also, cylindrical shell shows softening behavior under symmetric axial strain-controlled loading and due to the localized buckling, which occurs in the compressive stress-strain curve of the shell; it has more residual plastic strain in comparison to the tensile stress-strain hysteresis curve. The numerical analysis was carried out by ABAQUS software using hardening models. The nonlinear isotropic/kinematic hardening model accurately simulates the ratcheting behavior of shell. Although hardening models are incapable of simulating the softening behavior of the shell, this model analyzes the softening behavior well. Moreover, the model calculates the residual plastic strain close to the experimental data. Experimental tests were performed using an INSTRON 8802 servo-hydraulic machine. Simulations show good agreement between numerical and experimental results. The results reveal that the rate of plastic strain accumulation increases for the first few cycles and then reduces in the subsequent cycles. This reduction is more rapid for numerical results in comparison to experiments.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001718026
|
oai_dc
|
Development of a retrofit anchor system for remodeling of building exteriors
|
Development of a retrofit anchor system for remodeling of building exteriors
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kyu Won Yeun(Institute of Construction Technology); Ki Nam Hong(Chungbuk National University); Jong Kim(Institute of Construction Technology)"
] |
To enable remodeling of the exterior of buildings more convenient, such finishing materials as curtain walls, metal panels, concrete panels or dry stones need to be easily detached. In this respect, this study proposed a new design of the slab for the purposes. In the new design, the sides of the slab were properly modified, and the capabilities of anchors fixed in the modified slab were experimentally tested. In details, a number of concrete specimens with different sizes and compressive strengths were prepared, and the effect of anchors with different diameters and embedment depths applied in the concrete specimens were tested. The test results of the maximum capacities of the anchors were compared with the number of current design codes and the stress distribution was identified. This study found that the embedment depth specified in the current design code (ACI318-08) should be revised to be more than 1.5 times the edge distance. However, with the steel sheet reinforcement, the experiment acquired higher tensile strength than the design code proposed. In addition, for two types of specimens in the tensile strength experiment, the current design code (ACI 318-08) is overestimated for the anchor depth of 75 mm. This study demonstrated that the ideal breakout failure was attainable for the side slot details of a slab with more than 180 mm of a slab thickness and less than 75 mm of an anchor embedment depth. It is expected that these details of the modified slab can be specified in the upgraded construction design codes.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001718014
|
oai_dc
|
The structural performance of arches made of few vossoirs with dry-joints
|
The structural performance of arches made of few vossoirs with dry-joints
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ernest Bernat-Maso(Universitat Politècnica de Catalunya); Lluís Gil(Universitat Politècnica de Catalunya); Jordi Marcé-Nogué(Universitat Politècnica de Catalunya)"
] |
This work approaches the structural performance of masonry arches that have a small ratio between number of vossoirs and span length. The aim of this research is to compare and validate three different methods of analysis (funicular limit analysis F.L.A., kinematic limit analysis K.L.A. and plane stress Finite Element Analysis F.E.A.) with an experimental campaign. 18 failure tests with arches of different shapes and boundary conditions have been performed. The basic failure mechanism was the formation of enough hinges in the geometry. Nevertheless, in few cases, sliding between vossoirs also played a relevant influence. Moreover, few arches didn’t reach the collapse. The FLA and KLA didn't find a solution close to the experimental values for some of the tests. The low number of vossoirs and joints become a drawback for an agreement between kinematic mechanism, equilibrium of forces and geometry constraints. FLA finds a lower bound whereas KLA finds an upper bound of the ultimate load of the arch. FEA is the most reliable and robust method and it can reproduce most of the mechanism and ultimate loads. However, special care is required in the definition of boundary conditions for FEA analysis. Scientific justification of the more suitability of numerical methods in front of classic methods at calculating arches with a few vossoirs is the main original contribution of the paper.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001718010
|
oai_dc
|
Strengthening of reinforced concrete beams with epoxy-bonded perforated steel plates
|
Strengthening of reinforced concrete beams with epoxy-bonded perforated steel plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sabahattin Aykac(Gazi University); Ilker Kalkan(Kirikkale University); Ali Uysal(Civil Engineering Group)"
] |
Although being one of the most popular strengthening techniques in reinforced concrete beams, the use of steel plates bonded to the soffit raises problems of ductility. This study aims at investigating the influence of the use of perforated steel plates instead of solid steel plates on the ductility of reinforced concrete beams. A total of nine reinforced concrete beams were tested. In addition to an unplated beam, eight beams with perforated steel plates of two different thicknesses (3 mm and 6 mm) were subjected to monotonic loading. Effect of bonding the plates to the beams with anchor bolts and with additional side plates bonded to the sides of the beam with and without anchors is also investigated. The use of bolts in addition to epoxy was found to greatly contribute to the ductility and energy absorption capacity of the beams, particularly in specimens with thick plates (6 mm) and the use side plates in addition to the bottom plate was found to be ineffective in increasing the ductility of a concrete beam unless the side plates are attached to the beam with anchors bolts. The thickness of the plate was found to have little effect on the bending rigidity of the beam.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001718009
|
oai_dc
|
Interfacial stress assessment at the cracked zones in CFRP retrofitted RC beams
|
Interfacial stress assessment at the cracked zones in CFRP retrofitted RC beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ata Hojatkashani(University of Applied Science and Technology); Mohammad Zaman Kabir(Amirkabir University of Technology)"
] |
In this work, an experimental examination was carried out to study interfacial stresses developed at the junction zones between carbon fiber reinforced plastic (CFRP) fabrics (~1 mm thickness) and tensile concrete portion in CFRP retrofitted RC beams. In this respect, initially six similar RC beams of 150 × 150 × 1000 mm dimensions were prepared. Three of which were strengthened with CFRP fabrics at the tensile side of the beams. Furthermore, a notch was cut at the center of the bottom surface for all of the studied beams. The notch was 15 mm deep and ran across the full width of tension side of the beams. The mentioned interfacial stresses could be calculated from strains measured using strain gauges mounted on the interface zone of the tensile concrete and the CFRP sheet. Based on the results obtained,it is shown that interfacial stresses developed between CFRP fabrics and RC beam had a noticeable effect on debonding failure mode of the latter. The load carrying capacity of CFRP strengthened RC specimens increased ~75% compared to that of the control RC beams. This was attributed to the enhancement of flexural mode of the former. Finally, finite element analysis was also utilized to verify the measured experimental results.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001718020
|
oai_dc
|
Improved interfacial stress analysis of a plated beam
|
Improved interfacial stress analysis of a plated beam
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sheng-Wang Hao(Yanshan University); Yan Liu(Yanshan University); Xiao-Dan Liu(Yanshan University)"
] |
A plated beam is strengthened by bonding a thin plate to the tension face; it often fails because of premature debonding of the thin plate from the original beam in a brittle manner. A sound understanding of the mechanism of such debonding failure is very important for the effective use of this strengthening technique. This paper presents an improved analytical solution for interfacial stresses that incorporates multiple loading conditions simultaneously, including prestress, mechanical and thermal loads, and the effects of adherend shear deformations and curvature mismatches between the beam and the plate. Simply supported beams bonded with a thin prestressing plate and subjected to both mechanical and thermal loading were considered in the present work. The effects of the curvature mismatch and adherend shear deformations of the beam and plate were investigated and compared. The main mechanisms affecting the distribution of interfacial stresses were analyzed. Both the normal and shear stresses were found to be significantly influenced by the coupled effects of the elastic moduli with the ratios Ea/Eb and Ea/Ep.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001769219
|
oai_dc
|
The effect of short columns on the performance of existing buildings
|
The effect of short columns on the performance of existing buildings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ali Koçak(Yıldız Technical University)"
] |
In this study, the seismic performance of a residential building which was damaged in the 1992Erzincan (Turkey) Earthquake (Ms = 6.8) is performed. Damages on columns due to short columns are estimated analytically implementing the shear hinges and results are compared with the observed damages on the building after the earthquake. In seismic performance evaluation, a deformation based approach is adopted, whereby the structural behavior under external and seismic loads is evaluated. Furthermore, the effects of short columns formed by band windows in basement floors are investigated analytically. The sizes of band windows are parametrically changed in order to understand the effects of short columns on overall building behavior.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001769221
|
oai_dc
|
Collapse behaviour in reciprocal frame structures
|
Collapse behaviour in reciprocal frame structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Elsa Garavaglia(Politecnico di Milano); Attilio Pizzigoni(Università degli Studi di Bergamo); Luca Sgambi(Politecnico di Milano); Noemi Basso(Politecnico di Milano)"
] |
“Reciprocal Frame” refers to a self-supporting grid structure used both for floor and roof. Using Finite Element Methods for non-linear solid mechanics and frictional-contact, this paper intends to analytically and numerically investigate the collapse behaviour of a reciprocal frame structure made of fibrereinforced concrete. Considering a simple 3-beam structure, it has been investigated using a solid finite element model. Once defined the collapse behaviour of the simple structure, the analysis has been generalized using a concentrated plasticity finite element method. Results provided will be useful for studying generic reciprocal frame structures with several beams.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001769220
|
oai_dc
|
Experimental study on ultimate torsional strength of PC composite box-girder with corrugated steel webs under pure torsion
|
Experimental study on ultimate torsional strength of PC composite box-girder with corrugated steel webs under pure torsion
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yong Ding(PLA University of Science and Technology); Kebin Jiang(PLA University of Science and Technology); Fei Shao(PLA University of Science and Technology); Anzhong Deng(Institute of Logistics Engineering of PLA)"
] |
To have a better understanding of the torsional mechanism and influencing factors of PC composite box-girder with corrugated steel webs, ultimate torsional strength of four specimens under pure torsion were analyzed with Model Test Method. Monotonic pure torsion acts on specimens by eccentric concentrated loading. The experimental results show that cracks form at an angle of 45° to the member’s longitudinal axis in the top and bottom concrete slabs. Longitudinal reinforcement located in the center of cross section contributes little to torsional capacity of the specimens. Torsional rigidity is proportional to shape parameter η of corrugation and there is an increase in yielding torque and ultimate torque of specimens as the thickness of corrugated steel webs increases.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001769223
|
oai_dc
|
An improved algorithm in railway truss bridge optimization under stress, displacement and buckling constraints imposed on moving load
|
An improved algorithm in railway truss bridge optimization under stress, displacement and buckling constraints imposed on moving load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Saeed Mohammadzadeh(Iran University of Science and Technology); Mehrdad Nouri(Iran University of Science and Technology)"
] |
Railway truss bridges are amongst the essential structures in railway transportation. Minimization of the construction and maintenance costs of these trusses can effectively reduce investments in railway industries. In case of railway bridges, due to high ratio of the live load to the dead load, the moving load has considerable influence on the bridge dynamics. In this paper, optimization of the railway truss bridges under moving load is taken into consideration. The appropriate algorithm namely Hyper-sphere algorithm is used for this multifaceted problem. Through optimization the efficiency of the method successfully raised about 5 percent, compared with similar algorithms. T proposed optimization carried out on several typical railway trusses. The influences of buckling, deformation constraints, and the optimum height of each type of truss, assessed using a simple approximation method.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001769222
|
oai_dc
|
Analytical and experimental study on aerodynamic control of flutter and buffeting of bridge deck by using mechanically driven flaps
|
Analytical and experimental study on aerodynamic control of flutter and buffeting of bridge deck by using mechanically driven flaps
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Duc - Huynh Phan(the University of Education and Technology); Hiroshi Kobayshi(the University of Education and Technology)"
] |
A passive control using flaps will be an alternative solution for flutter stability and buffeting response of a long suspension bridge. This method not only enables a lightweight economic stiffening girder without an additional stiffness for aerodynamic stability but also avoid the problems from the malfunctions of control systems and energy supply system of an active control by winglets and flaps. A time domain approach for predicting the coupled flutter and buffeting response of bridge deck with flaps is investigated. First, the flutter derivatives of bridge deck and flaps are found by experiment. Next, the derivation of time domain model of self-excited forces and control forces of sectional model is reported by using the rational function approximation. Finally, the effectiveness of passive flap control is investigated by the numerical simulation. The results show that the passive control by using flaps can increase the flutter speed and decrease the buffeting response. The experiment results are matched with numerical ones.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001769218
|
oai_dc
|
Experimental investigation of a new steel friction device with link element for seismic strengthening of structures
|
Experimental investigation of a new steel friction device with link element for seismic strengthening of structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Panikos K. Papadopoulos(Aristotle University of Thessaloniki); Thomas N. Salonikios(Agiou Georgiou 5); Stergios A. Dimitrakis(Aristotle University of Thessaloniki); Alkis P. Papadopoulos(Aristotle University of Thessaloniki)"
] |
In the present work a new friction device, with a set of single or double rotational friction flanges and a link element, is described and tested. The mechanism may be applied for the strengthening of existing r/c or steel buildings as well as in new constructed buildings. The device has selectable variable behavior in different levels of displacement and an interlock meαchanism that is provided by the link element. The link element may be designed to lock at preselected level of displacement, offering in this way an extra safety reserve against strong earthquakes. A summary of the existing literature about other similar mechanisms is initially presented in this paper. The proposed mechanism is presented and described in details. Laboratory experiments are presented in detail and the resulted response that proves the efficiency of the mechanism at selectable levels of strength capacity is discussed. Drawings of the mechanism attached to a r/c frame with connection details are also included. Finally a dynamic analysis of two r/c frames, with and without the proposed mechanism attached, is performed and the resulted response is given. The main conclusion is that the proposed mechanism is a cheap and efficient devise for the improvement of the performance of new or existing framed buildings to seismic loads.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001769217
|
oai_dc
|
Statistical damage classification method based on wavelet packet analysis
|
Statistical damage classification method based on wavelet packet analysis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.S. Law(Hong Kong Polytechnic University); X.Q. Zhu(University of Western Sydney); Y.J. Tian(Beijing Jiaotong University); X.Y. Li(Jinan University); S.Q. Wu(Southeast University)"
] |
A novel damage classification method based on wavelet packet transform and statistical analysis is developed in this study for structural health monitoring. The response signal of a structure under an impact load is normalized and then decomposed into wavelet packet components. Energies of these wavelet packet components are then calculated to obtain the energy distribution. Statistical similarity comparison based on an F-test is used to classify the structure from changes in the wavelet packet energy distribution. A statistical indicator is developed to describe the damage extent of the structure. This approach is applied to the test results from simply supported reinforced concrete beams in the laboratory. Cases with single and two damages are created from static loading, and accelerations of the structure from under impact loads are analyzed. Results show that the method can be used with no reference baseline measurement and model for the damage monitoring and assessment of the structure with alarms at a specified significance level.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001769216
|
oai_dc
|
Use of uncertain numbers for appraising tensile strength of concrete
|
Use of uncertain numbers for appraising tensile strength of concrete
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Bulent Tutmez(Inonu University); A. Kemal Cengiz(Hacettepe University); Didem Eren Sarici(Inonu University)"
] |
Splitting tensile strength (STS) is a respectable mechanical property reflecting ability of the concrete. The STS of concrete is mainly related to compressive strength (CS), water/binder (W/B) ratio and concrete age. In this study, the assessment of STS is made by a novel uncertainty-oriented method which uses least square optimization and then predicts STS of concrete by uncertain (fuzzy) numbers. The approximation method addresses a novel integration of fuzzy set theory and multivariate statistics. The numerical examples showed that the method is applicable with relatively limited data. In addition, the prediction of uncertainty at various levels of possibility can be described. In conclusion, the uncertaintyoriented interval analysis can be suggested an effective tool for appraising the uncertainties in concrete technology.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001652717
|
oai_dc
|
Exact and complete fundamental solutions for penny-shaped crack in an infinite transversely isotropic thermoporoelastic medium: mode I problem
|
Exact and complete fundamental solutions for penny-shaped crack in an infinite transversely isotropic thermoporoelastic medium: mode I problem
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xiang-Yu LI(Southwest Jiaotong University); J. Wu(Université de Poitiers); W.Q. Chen(Zhejiang University); Hui-Ying Wang(University of Poitiers); Z.Q. Zhou(University of Miami)"
] |
This paper examines the problem of a penny-shaped crack in a thermoporoelastic body. On the basis of the recently developed general solutions for thermoporoelasticity, appropriate potentials are suggested and the governing equations are solved in view of the similarity to those for pure elasticity. Exact and closed form fundamental solutions are expressed in terms of elementary functions. The singularity behavior is then discussed. The present solutions are compared with those in literature and an excellent agreement is achieved. Numerical calculations are performed to show the influence of the material parameters upon the distribution of the thermoporoelastic field. Due to its ideal property, the present solution is a natural benchmark to various numerical codes and simplified analyses.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000073.xml
|
||
ART001652722
|
oai_dc
|
Free vibration analysis of tapered FRP transmission poles with flexible joint by finite element method
|
Free vibration analysis of tapered FRP transmission poles with flexible joint by finite element method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Behnam Saboori(K.N. Toosi University of Technology); Seyed Mohammad Reza Khalili(K.N. Toosi University of Technology)"
] |
Since relatively low elasticity modulus of the FRP materials results in lower natural frequencies, it is necessary to study the free vibration of FRP transmission poles. In this paper, the free vibration of tapered FRP transmission poles with thin-walled circular cross-section is investigated by a tapered beam element. To model the flexible joints of the modular poles, a rotational spring model is used. Modal analysis is performed for typical FRP poles with/without joint and they are also modeled by ANSYS commercial finite element software. There is a good correlation between the results of the tapered beam finite element model and those obtained from ANSYS as well as the existing experimental results. The effects of different geometries, material lay-ups, concentrated masses at the pole tip, and joint flexibilities are evaluated. Moreover, it is concluded that using tougher fibres at the inner and outer layers of the cross-section, results in higher natural frequencies, significantly.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000073.xml
|
||
ART001652721
|
oai_dc
|
A numerical approach for simulating the behaviour of timber shear walls
|
A numerical approach for simulating the behaviour of timber shear walls
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wei Yuen Loo(University of Auckland); Pierre Quenneville(University of Auckland); Nawawi Chouw(University of Auckland)"
] |
A numerical approach to simulate the behaviour of timber shear walls under both static and dynamic loading is proposed. Because the behaviour of timber shear walls hinges on the behaviour of the nail connections, the force-displacement behaviour of sheathing-to-framing nail connections are first determined and then used to define the hysteretic properties of finite elements representing these connections. The model nails are subsequently implemented into model walls. The model walls are verified using experimental results for both monotonic and cyclic loading. It is demonstrated that the complex hysteretic behaviour of timber shear walls can be reasonably represented using model shear walls in which nonlinear material failure is concentrated only at the sheathing-to-framing nail connections.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000073.xml
|
||
ART001652723
|
oai_dc
|
Detection and quantification of structural damage under ambient vibration environment
|
Detection and quantification of structural damage under ambient vibration environment
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Gun Jin Yun(The University of Akron)"
] |
In this paper, a new damage detection and quantification method has been presented to perform detection and quantification of structural damage under ambient vibration loadings. To extract modal properties of the structural system under ambient excitation, natural excitation technique (NExT)and eigensystem realization algorithm (ERA) are employed. Sensitivity matrices of the dynamic residual force vector have been derived and used in the parameter subset selection method to identify multiple damaged locations. In the sequel, the steady state genetic algorithm (SSGA) is used to determine quantified levels of the identified damage by minimizing errors in the modal flexibility matrix. In this study, performance of the proposed damage detection and quantification methodology is evaluated using a finite element model of a truss structure with considerations of possible experimental errors and noises. A series of numerical examples with five different damage scenarios including a challengingly small damage level demonstrates that the proposed methodology can efficaciously detect and quantify damage under noisy ambient vibrations.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000073.xml
|
||
ART001652718
|
oai_dc
|
A modified particle swarm approach for multi-objective optimization of laminated composite structures
|
A modified particle swarm approach for multi-objective optimization of laminated composite structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Sepehri(Shiraz University); F. Daneshmand(Shiraz University); K. Jafarpur(Shiraz University)"
] |
Particle Swarm Optimization (PSO) is a stochastic population based optimization algorithm which has attracted attentions of many researchers. This method has great potentials to be applied to many optimization problems. Despite its robustness the standard version of PSO has some drawbacks that may reduce its performance in optimization of complex structures such as laminated composites. In this paper by suggesting a new variation scheme for acceleration parameters and inertial weight factors of PSO a novel optimization algorithm is developed to enhance the basic version’s performance in optimization of laminated composite structures. To verify the performance of the new proposed method, it is applied in two multi-objective design optimization problems of laminated cylindrical. The numerical results from the proposed method are compared with those from two other conventional versions of PSObased algorithms. The convergancy of the new algorithms is also compared with the other two versions. The results reveal that the new modifications inthe basic forms of particle swarm optimization method can increase its convergence speed and evade it from local optima traps. It is shown that the parameter variation scheme as presented in this paper is successful and can evenfind more preferable optimum results in design of laminated composite structures.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000073.xml
|
||
ART001652720
|
oai_dc
|
The influence of load pulse shape on pressure-impulse diagrams of one-way RC slabs
|
The influence of load pulse shape on pressure-impulse diagrams of one-way RC slabs
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wei Wang(National University of Defense Technology); Duo Zhang(National University of Defense Technology); Fangyun Lu(National University of Defense Technology)"
] |
This study is aimed at providing an efficient analytical model to obtain pressure- impulse diagram of one-way reinforced concrete slabs subjected to different shapes of air blast loading using single degree of freedom method (SDOF). A tri-linear elastic perfectly plastic SDOF model has been used to obtain the pressure-impulse diagram to correlate the blast pressure and the corresponding concrete flexural damage. In order to capture the response history for the slab, a new approximately SDOF method based on the conventional SDOF method is proposed and validated using published test data. The influences of pulse loading shape on the pressure-impulse diagram are studied. Based on the results, a pressure-impulse diagram generation method using SDOF and an analytical equation for the pressureimpulse diagram is proposed to different damage levels and different blast loading shapes.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000073.xml
|
||
ART001652716
|
oai_dc
|
The characteristics of the multi-span suspension bridge with double main cables in the vertical plane
|
The characteristics of the multi-span suspension bridge with double main cables in the vertical plane
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Li-wen Zhang(Tongji University); Ru-cheng Xiao(Tongji University); Yang Jiang(Tongji University); Sheng-bo Chai(Tongji University)"
] |
The multi-span suspension bridge having double main cables in the vertical plane is investigated regarding endurance of live load distribution in the case of non-displaced pylon and pylon displacement. The coefficient formula of live load distribution described as the ratio of live load on the bottom cable to the top cable is obtained. Based on this formula, some function in respect of this bridge are derived and used to analyze its characteristics. This analysis targets the cable force, the cable sag and the horizontal displacement at the pylon top under live load etc. The results clarified that the performance of the live load distribution and the horizontal force of cables in the case of non-deformed pylon has a similar tendency to those in the case of deformed pylon, and the increase of pylon rigidity can increase live load distributed to the bottom cable and slightly raise the cable horizontal force under live load.
However, effect on the vertical rigidity of bridge and the horizontal force increment of cables caused by live load is different in the case of non-deformed pylon and deformed pylon.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000073.xml
|
||
ART001652719
|
oai_dc
|
Elastodynamic infinite elements based on modified Bessel shape functions, applicable in the finite element method
|
Elastodynamic infinite elements based on modified Bessel shape functions, applicable in the finite element method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K.S. Kazakov(VSU)"
] |
In this paper decay and mapped elastodynamic infinite elements, based on modified Bessel shape functions and appropriate for Soil-Structure Interaction problems are described and discussed. These elements can be treated as a new form of the recently proposed Elastodynamic Infinite Elements with United Shape Functions (EIEUSF) infinite elements. The formulation of 2D horizontal type infinite elements (HIE) is demonstrated, but by similar techniques 2D vertical (VIE) and 2D corner (CIE) infinite elements can also be formulated. It is demonstrated that the application of the elastodynamical infinite elements is the easier and appropriate way to achieve an adequate simulation including basic aspects of Soil-Structure Interaction. Continuity along the artificial boundary (the line between finite and infinite elements) is discussed as well and the application of the proposed elastodynamical infinite elements in the Finite Element Method is explained in brief. Finally, a numerical example shows the computational efficiency of the proposed infinite elements.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000073.xml
|
||
ART001642094
|
oai_dc
|
Reduction of seismic pounding effects of base-isolated RC highway bridges using MR damper
|
Reduction of seismic pounding effects of base-isolated RC highway bridges using MR damper
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.N. Sheikh(University of Wollongong); J. Xiong(University of Wollongong); W.H. Li(University of Wollongong)"
] |
Significant structural damages due to pounding between adjacent superstructures of multispan reinforced concrete (RC) highway bridges have been observed in past earthquakes. Different methods have been proposed in the literature to mitigate the adverse seismic pounding effects. This paper presents an analytical investigation on the use of magnetorheological (MR) dampers in reducing seismic pounding effects of base-isolated multi-span RC highway bridges. It has been observed that MR damper can effectively reduce the seismic pounding effect. Three control strategies (passive off, passive on, and bang bang control) of MR damper have been investigated. Although all the control strategies are found to be effective, bang bang control has been observed to be the most effective.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001642092
|
oai_dc
|
A study on determination of target displacement of RC frames using PSV spectrum and energy-balance concept
|
A study on determination of target displacement of RC frames using PSV spectrum and energy-balance concept
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Taner Ucar(Dokuz Eylul University); Onur Merter(Dokuz Eylul University); Mustafa Duzgun(Dokuz Eylul University)"
] |
The objective of this paper is to present an energy-based method for calculating target displacement of RC structures. The method, which uses the Newmark-Hall pseudo-velocity spectrum, is called the “Pseudo-velocity Spectrum (PSVS) Method”. The method is based on the energy balance concept that uses the equality of energy demand and energy capacity of the structure. First, nonlinear static analyses are performed for five, eight and ten-story RC frame structures and pushover curves are obtained. Then the pushover curves are converted to energy capacity diagrams. Seven strong ground motions that were recorded at different soil sites in Turkey are used to obtain the pseudo-acceleration and the pseudo-velocity response spectra. Later, the response spectra are idealised with the Newmark-Hall approximation. Afterwards, energy demands for the RC structures are calculated using the idealised pseudo-velocity spectrum. The displacements, obtained from the energy capacity diagrams that fit to the energy demand values of the RC structures, are accepted as the energy-based performance point of the structures. Consequently, the target displacement values determined from the PSVS Method are checked using the displacement-based successive approach in the Turkish Seismic Design Code. The results show that the target displacements of RC frame structures obtained from the PSVS Method are very close to the values calculated by the approach given in the Turkish Seismic Design Code.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001642088
|
oai_dc
|
Nonlinear interaction behaviour of plane frame-layered soil system subjected to seismic loading
|
Nonlinear interaction behaviour of plane frame-layered soil system subjected to seismic loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ramakant Agrawal(TRUBA Institute of Engineering and Information Technology); M.S. Hora(Maulana Azad National Institute of Technology)"
] |
The foundation of a tall building frame resting on settable soil mass undergoes differential settlements which alter the forces in the structural members significantly. For tall buildings it is essential to consider seismic forces in analysis. The building frame, foundation and soil mass are considered to act as single integral compatible structural unit. The stress-strain characteristics of the supporting soil play a vital role in the interaction analysis. The resulting differential settlements of the soil mass are responsible for the redistribution of forces in the superstructure. In the present work, the nonlinear interaction analysis of a two-bay ten-storey plane building frame- layered soil system under seismic loading has been carried out using the coupled finite-infinite elements. The frame has been considered to act in linear elastic manner while the soil mass to act as nonlinear elastic manner. The subsoil in reality exists in layered formation and consists of various soil layers having different properties. Each individual soil layer in reality can be considered to behave in nonlinear manner. The nonlinear layered system as a whole will undergo differential settlements. Thus, it becomes essential to study the structural behaviour of a structure resting on such nonlinear composite layered soil system. The nonlinear constitutive hyperbolic soil model available in the literature is adopted to model the nonlinear behaviour of the soil mass. The structural behaviour of the interaction system is investigated as the shear forces and bending moments in superstructure get significantly altered due to differential settlements of the soil mass.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001642090
|
oai_dc
|
Locating a weakened interface in a laminated elastic plate
|
Locating a weakened interface in a laminated elastic plate
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J. Zhu(Zhejiang University); J.S. Yang(University of Nebraska); W.Q. Chen(Zhejiang University)"
] |
We study thickness-shear (TSh) free vibrations of an unbounded, laminated elastic plate with three layers of different materials. One of the two interfaces is slightly weakened as described by the shear-lag model that allows the displacement to be discontinuous across the interface. A frequency equation is obtained from the linear theory of elasticity. A perturbation solution of the frequency equation is obtained from which the frequency shifts of TSh modes due to the weakened interface can be calculated. It is shown that the frequency shifts of TSh modes of different orders are different, and they satisfy different conditions when different interfaces are weakened. These conditions are obtained which can potentially be used as criteria for determining specifically which interface is weakened.
|
토목공학
| null |
kci_detailed_000073.xml
|
|||
ART001642089
|
oai_dc
|
Comparison between two geometrical nonlinear methods for truss analyses
|
Comparison between two geometrical nonlinear methods for truss analyses
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Greco(Federal University of Minas Gerais); R.C.G. Menin(University of Brasília); I.P. Ferreira(Federal University of Minas Gerais); F.B. Barros(Federal University of Minas Gerais)"
] |
This paper presents a comparison between two different procedures to deal with the geometric nonlinear analysis of space trusses, considering its structural stability aspects. The first nonlinear formulation, called positional, uses nodal positions rather than nodal displacements to describe the finite elements kinematics. The strains are computed directly from the proposed position concept, using a Cartesian coordinate system fixed in space. The second formulation, called corotational, is based on the explicit separation between rigid body motion and deformed motion. The numerical examples demonstrate the performances and the convergence of the responses for both analyzed formulations. Two numerical examples were compared, including a lattice beam with postcritical behavior. Despite the two completely different approaches to deal with the geometrical nonlinear problem, the results present good agreement.
|
토목공학
| null |
kci_detailed_000073.xml
|
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