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ART001359141
|
oai_dc
|
Vibration analysis of a uniform beam traversed by a moving vehicle with random mass and random velocity
|
Vibration analysis of a uniform beam traversed by a moving vehicle with random mass and random velocity
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"T-P. Chang(National Kaohsiung First University of Science and Technology); M-F. Liu(I-Shou University); H-W. O(National Kaohsiung First University of Science and Technology)"
] |
The problem of estimating the dynamic response of a distributed parameter system excited by a moving vehicle with random initial velocity and random vehicle body mass is investigated. By adopting the Galerkin’s method and modal analysis, a set of approximate governing equations of motion possessing time-dependent uncertain coefficients and forcing function is obtained, and then the dynamic response of the coupled system can be calculated in deterministic sense. The statistical characteristics of the responses of the system are computed by using improved perturbation approach with respect to mean value. This method is simple and useful to gather the stochastic structural response due to the vehiclepassenger-bridge interaction. Furthermore, some of the statistical numerical results calculated from the perturbation technique are checked by Monte Carlo simulation.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001470918
|
oai_dc
|
Earthquake response of isolated cable-stayed bridges under spatially varying ground motions
|
Earthquake response of isolated cable-stayed bridges under spatially varying ground motions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sevket Ates(Karadeniz Technical University); Kurtulus Soyluk(Gazi University); A. Aydin Dumanoglu(Karadeniz Technical University); Alemdar Bayraktar(Karadeniz Technical University)"
] |
A comprehensive investigation of the stochastic response of an isolated cable-stayed bridge subjected to spatially varying earthquake ground motion is performed. In this study, the Jindo Bridge built in South Korea is chosen as a numerical example. The bridge deck is assumed to be continuous from one
end to the other end. The vertical movement of the stiffening girder is restrained and freedom of rotational movement on the transverse axis is provided for all piers and abutments. The longitudinal restraint is provided at the mainland pier. The A-frame towers are fixed at the base. To implement the
base isolation procedure, the double concave friction pendulum bearings are placed at each of the four support points of the deck. Thus, the deck of the cable-stayed bridge is isolated from the towers using the double concave friction pendulum bearings which are sliding devices that utilize two spherical concave surfaces. The spatially varying earthquake ground motion is characterized by the incoherence and wavepassage effects. Mean of maximum response values obtained from the spatially varying earthquake ground motion case are compared for the isolated and non-isolated bridge models. It is pointed out that the base isolation of the considered cable-stayed bridge model subjected to the spatially varying earthquake ground
motion significantly underestimates the deck and the tower responses.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395623
|
oai_dc
|
New eight node serendipity quadrilateral plate bending element for thin and moderately thick plates using Integrated Force Method
|
New eight node serendipity quadrilateral plate bending element for thin and moderately thick plates using Integrated Force Method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H.R. Dhananjaya(Manipal Institute of Technology); P.C. Pandey(Indian Institute of Science); J. Nagabhushanam(Indian Institute of Science)"
] |
A new 8-node serendipity quadrilateral plate bending element (MQP8) based on the Mindlin-Reissner theory for the analysis of thin and moderately thick plate bending problems using Integrated Force Method is presented in this paper. The performance of this new element (MQP8) is studied for accuracy and convergence by analyzing many standard benchmark plate bending problems. This new element MQP8 performs excellent in both thin and moderately thick plate bending situations. And also this element is free from spurious/zero energy modes and free from shear locking problem.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395628
|
oai_dc
|
Dynamic eigenvalue analysis of structures with interval parameters based on affine arithmetic
|
Dynamic eigenvalue analysis of structures with interval parameters based on affine arithmetic
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zhu Zeng-qing( Xidian University); Chen Jian-jun( Xidian University)"
] |
토목공학
| null |
kci_detailed_000079.xml
|
||||
ART001395618
|
oai_dc
|
Comparison of uniform and spatially varying ground motion effects on the stochastic response of fluid-structure interaction systems
|
Comparison of uniform and spatially varying ground motion effects on the stochastic response of fluid-structure interaction systems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yasemin Bilici(Karadeniz Technical University); Alemdar Bayraktar(Karadeniz Technical University); Suleyman Adanur(Karadeniz Technical University)"
] |
The effects of the uniform and spatially varying ground motions on the stochastic response of fluid-structure interaction system during an earthquake are investigated by using the displacement based fluid finite elements in this paper. For this purpose, variable-number-nodes two-dimensional fluid finite elements based on the Lagrangian approach is programmed in FORTRAN language and incorporated into a general-purpose computer program SVEM, which is used for stochastic dynamic analysis of solid systems under spatially varying earthquake ground motion. The spatially varying earthquake ground motion model includes wave-passage, incoherence and site-response effects. The effect of the wavepassage is considered by using various wave velocities. The incoherence effect is examined by
considering the Harichandran-Vanmarcke and Luco-Wong coherency models. Homogeneous medium and firm soil types are selected for considering the site-response effect where the foundation supports are constructed. A concrete gravity dam is selected for numerical example. The S16E component recorded at Pacoima dam during the San Fernando Earthquake in 1971 is used as a ground motion. Three different analysis cases are considered for spatially varying ground motion. Displacements, stresses and hydrodynamic pressures occurring on the upstream face of the dam are calculated for each case and compare with those of uniform ground motion. It is concluded that spatially varying earthquake ground motions have important effects on the stochastic response of fluid-structure interaction systems.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395627
|
oai_dc
|
Performance functions for laterally loaded single concrete piles in homogeneous clays
|
Performance functions for laterally loaded single concrete piles in homogeneous clays
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Gokhan mancli(Dokuz Eylul University); M. Rifat Kahyaoglu(Dokuz Eylul University); Gurkan Ozden(Dokuz Eylul University); Arif S. Kayalar(Dokuz Eylul University)"
] |
A key parameter in the design of a laterally loaded pile is the determination of its performance level. Performance level of a pile is usually expressed as the maximum head deflection and bending moment. In general, uncertainties in the performance of a pile originates from many factors such as inherent variability of soil properties, inadequate soil exploration programs, errors taking place in the determination of soil parameters, limited calculation models as well as uncertainties in loads. This makes it difficult for practicing engineers to decide for the reliability of laterally loaded piles both in cohesive and cohesionless soils. In this paper, limit state functions and consequent performance functions are obtained for single concrete piles to predict the maximum bending moment, a widely accepted design criterion along with the permissible pile head displacement. Analyses were made utilizing three dimensional finite element method and soil-structure-interaction (SSI) effects were accounted for.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395616
|
oai_dc
|
Dynamics of multilayered viscoelastic beams
|
Dynamics of multilayered viscoelastic beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H. Roy(National Institute of Technology); J.K. Dutt(Indian Institute of Technology); P.K. Datta(Indian Institute of Technology)"
] |
Viscoelastic materials store as well as dissipate energy to the thermal domain under deformation. Two efficient modelling techniques reported in literature use coupled (thermo-mechanical) ATF (Augmenting Thermodynamic Fields) displacements and ADF (Anelastic Displacement Fields) displacements, to represent the constitutive relationship in time domain by using certain viscoelastic parameters. Viscoelastic parameters are first extracted from the storage modulus and loss factor normally reported in hand books with the help of Genetic Algorithm and then constitutive relationships are used to obtain the equations of motion of the continuum after discretizing it with finite beam elements. The equations of motion are solved to get the frequency response function and modal damping ratio. The process may be applied to study the dynamic behaviour of composite beams and rotors comprising of several viscoelastic layers. Dynamic behaviour of a composite beam, formed by concentric layers of steel and aluminium is studied as an example.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395620
|
oai_dc
|
Evaluation of homogenized thermal conductivities of imperfect carbon-carbon textile composites using the Mori-Tanaka method
|
Evaluation of homogenized thermal conductivities of imperfect carbon-carbon textile composites using the Mori-Tanaka method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jan Vorel(Czech Technical University in Prague); Michal Šejnoha(Czech Technical University in Prague)"
] |
Three-scale homogenization procedure is proposed in this paper to provide estimates of the effective thermal conductivities of porous carbon-carbon textile composites. On each scale - the level of fiber tow (micro-scale), the level of yarns (meso-scale) and the level of laminate (macro-scale) - a two step homogenization procedure based on the Mori-Tanaka averaging scheme is adopted. This involves evaluation of the effective properties first in the absence of pores. In the next step, an ellipsoidal pore is introduced into a new, generally orthotropic, matrix to make provision for the presence of crimp voids and transverse and delamination cracks resulting from the thermal transformation of a polymeric precursor into the carbon matrix. Other sources of imperfections also attributed to the manufacturing processes,
including non-uniform texture of the reinforcements, are taken into consideration through the histograms of inclination angles measured along the fiber tow path together with a particular shape of the equivalent
ellipsoidal inclusion proposed already in Sko ek (1998). The analysis shows that a reasonable agreement of the numerical predictions with experimental measurements can be achieved.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395621
|
oai_dc
|
Series solutions for spatially coupled buckling anlaysis of thin-walled Timoshenko curved beam on elastic foundation
|
Series solutions for spatially coupled buckling anlaysis of thin-walled Timoshenko curved beam on elastic foundation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김남일(명지대학교)"
] |
The spatially coupled buckling, in-plane, and lateral bucking analyses of thin-walled Timoshenko curved beam with non-symmetric, double-, and mono-symmetric cross-sections resting on elastic foundation are performed based on series solutions. The stiffness matrices are derived rigorously using the homogeneous form of the simultaneous ordinary differential equations. The present beam formulation includes the mechanical characteristics such as the non-symmetric cross-section, the thicknesscurvature effect, the shear effects due to bending and restrained warping, the second-order terms of semitangential rotation, the Wagner effect, and the foundation effects. The equilibrium equations and forcedeformation relationships are derived from the energy principle and expressions for displacement parameters are derived based on power series expansions of displacement components. Finally the element stiffness matrix is determined using force-deformation relationships. In order to verify the accuracy and validity of this study, the numerical solutions by the proposed method are presented and compared with the finite element solutions using the classical isoparametric curved beam elements and other researchers’ analytical solutions.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395625
|
oai_dc
|
Investigation on the flexural behaviour of ferrocement pipes and roof panels subjected to bending moment
|
Investigation on the flexural behaviour of ferrocement pipes and roof panels subjected to bending moment
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Alnuaimi A.S.(Sultan Qaboos University); Hago A.W.(Sultan Qaboos University); Al-Jabri K.S.(Sultan Qaboos University); Al-Saidy A.H.(Sultan Qaboos University)"
] |
This paper presents experimental results on the behaviour and ultimate load of fifteen pipes and six roof panels made of ferrocement. Additional results from three roof panels, carried out by others, are also compared with this research results. OPC cement, natural sand and galvanised iron wire mesh were used for the construction of 20 mm thick specimens. The pipe length was 2 m and roof panel length was 2.1 m. The main variables studied were the number of wire mesh layers which were 1, 2, 3, 4 and 6 layers, the inner pipe diameter which were 105, 210 and 315 mm, cross sectional shape of the panel which were channel and box sections and the depth of the edge beam which were 95 mm and 50 mm. All specimens were simply supported and tested for pure bending with test span of 600 mm at mid-span. Tests revealed that increasing the number of wire mesh layers increases the flexural strength and stiffness. Increasing the pipe diameter or depth of edge beam of the panel increases the cracking and ultimate moments. The change in the pipe diameter led to larger effect on ultimate moment than the effect of change in the number of wire mesh layers. The box section showed behaviour and strength similar to that of the channel with same depth and number of wire mesh layers.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395756
|
oai_dc
|
Comparison of several displacement-based theories by predicting thermal response of laminated beam
|
Comparison of several displacement-based theories by predicting thermal response of laminated beam
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ren Xiaohui(Dalian University of Technology); Chen Wanji(Dalian University of Technology)"
] |
토목공학
| null |
kci_detailed_000079.xml
|
||||
ART001395757
|
oai_dc
|
Contact analysis and optimization design of blade and disc assembly based on mesh deformation
|
Contact analysis and optimization design of blade and disc assembly based on mesh deformation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Baizhi Wang(Northwestern Polytechnical University); Qingmin Yu(Northwestern Polytechnical University); Naixian Hou(Northwestern Polytechnical University); Zhufeng Yue(Northwestern Polytechnical University)"
] |
토목공학
| null |
kci_detailed_000079.xml
|
||||
ART001395751
|
oai_dc
|
Effects of damping on the linear stability of a free-free beam subjected to follower and transversal forces
|
Effects of damping on the linear stability of a free-free beam subjected to follower and transversal forces
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"O. Kavianipour(K. N. T. University of Technology); S.H. Sadati(K. N. T. University of Technology)"
] |
In this paper a free-free uniform beam with damping effects subjected to follower and transversal forces at its end is considered as a model for a space structure. The effect of damping on the stability of the system is first investigated and the effects of the follower and transversal forces on the vibration of the beam are shown next. Proportional damping model is used in this work, hence, the effects of both internal (material) and external (viscous fluid) damping on the system are noted. In order to derive the frequency of the system, the Ritz method has been used. The mode shapes of the system must
therefore be extracted. The Newmark method is utilized in the study of the system vibration. The results show that an increase in the follower and transversal forces leads to an increase of the vibrational motion
of the beam which is not desirable.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395750
|
oai_dc
|
Dynamic stress intensity factors for two parallel cracks in an infinite orthotropic plate subject to an impact load
|
Dynamic stress intensity factors for two parallel cracks in an infinite orthotropic plate subject to an impact load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shouetsu Itou(Kanagawa University)"
] |
Stresses are solved for two parallel cracks in an infinite orthotropic plate during passage of incoming shock stress waves normal to their surfaces. Fourier transformations were used to reduce the boundary conditions with respect to the cracks to two pairs of dual integral equations in the Laplace domain. To solve these equations, the differences in the crack surface displacements were expanded to a series of functions that are zero outside the cracks. The unknown coefficients in the series were solved using the Schmidt method so as to satisfy the conditions inside the cracks. The stress intensity factors were defined in the Laplace domain and were inverted numerically to physical space. Dynamic stress intensity factors were calculated numerically for selected crack configurations.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395748
|
oai_dc
|
Failure analysis of laminates by implementation of continuum damage mechanics in layer-wise finite element theory
|
Failure analysis of laminates by implementation of continuum damage mechanics in layer-wise finite element theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"B. Mohammadi(Iran University of Science and Technology); H. Hosseini-Toudeshky(Amirkabir University of Technology); M.H. Sadr-Lahidjani(Amirkabir University of Technology)"
] |
In this paper a 3-D continuum damage mechanics formulation for composite laminates and its implementation into a finite element model that is based on the layer-wise laminate plate theory are described. In the damage formulation, each composite ply is treated as a homogeneous orthotropic material exhibiting orthotropic damage in the form of distributed microscopic cracks that are normal to the three principal material directions. The progressive damage of different angle ply composite laminates under quasi-static loading that exhibit the free edge effects are investigated. The effects of various
numerical modeling parameters on the progressive damage response are investigated. It will be shown that the dominant damage mechanism in the lay-ups of [+30/-30]s and [+45/-45]s is matrix cracking. However, the lay-up of [+15/-15] may be delaminated in the vicinity of the edges and at +θ/-θ layers interfaces.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395752
|
oai_dc
|
Probabilistic seismic performance evaluation of non-seismic RC frame buildings
|
Probabilistic seismic performance evaluation of non-seismic RC frame buildings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.M. Maniyar(S.P.C.E.); R.K. Khare(S.G.S. Institute of Technology & Science)"
] |
In this paper, probabilistic seismic performance assessment of a typical non-seismic RC frame building representative of a large inventory of existing buildings in developing countries is conducted. Nonlinear time-history analyses of the sample building are performed with 20 large-magnitude medium distance ground motions scaled to different levels of intensity represented by peak ground acceleration and 5% damped elastic spectral acceleration at the first mode period of the building. The hysteretic model used in the analyses accommodates stiffness degradation, ductility-based strength decay, hysteretic energy-based strength decay and pinching due to gap opening and closing. The maximum inter story drift ratios obtained from the time-history analyses are plotted against the ground motion intensities.
A method is defined for obtaining the yielding and collapse capacity of the analyzed structure using these curves. The fragility curves for yielding and collapse damage levels are developed by statistically interpreting the results of the time-history analyses. Hazard-survival curves are generated by changing the horizontal axis of the fragility curves from ground motion intensities to their annual probability of exceedance using the log-log linear ground motion hazard model. The results express at a glance the probabilities of yielding and collapse against various levels of ground motion intensities.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395755
|
oai_dc
|
Damage assessment of reinforced concrete beams including the load environment
|
Damage assessment of reinforced concrete beams including the load environment
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"X.Q. Zhu(The University of Western Sydney); S.S. Law(The Hong Kong Polytechnic University); H. Hao(The University of Western Australia)"
] |
Quantitative condition assessment of structures has been traditionally using proof load test leading to an indication of the load-carrying capacity. Alternative approaches using ultrasonic, dynamics etc. are based on the unloaded state of the structure and anomalies may not be fully mobilized in the load resisting path and thus their effects are not fully included in the measured responses. This paper studies the effect of the load carried by a reinforced concrete beam on the assessment result of the crack damage. This assessment can only be performed with an approach based on static measurement. The crack damage is modelled as a crack zone over an area of high tensile stress of the member, and it is represented by a damage function for the simulation study. An existing nonlinear optimization algorithm is adopted. The identified damage extent from a selected high level load and a low load level are compared, and it is concluded that accurate assessment can only be obtained at a load level close to the one that creates the
damage.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395749
|
oai_dc
|
Solution method for the classical beam theory using differential quadrature
|
Solution method for the classical beam theory using differential quadrature
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Rajasekaran(PSG College of Technology); L. Gimena(Public University of Navarre); P. Gonzaga(Public University of Navarre); F.N. Gimena(Public University of Navarre)"
] |
In this paper, a unified solution method is presented for the classical beam theory. In Strength of Materials approach, the geometry, material properties and load system are known and related with the unknowns of forces, moments, slopes and deformations by applying a classical differential analysis in addition to equilibrium, constitutive, and kinematic laws. All these relations are expressed in a unified formulation for the classical beam theory. In the special case of simple beams, a system of four linear ordinary differential equations of first order represents the general mechanical behaviour of a straight beam. These equations are solved using the numerical differential quadrature method (DQM). The application of DQM has the advantages of mathematical consistency and conceptual simplicity. The
numerical procedure is simple and gives clear understanding. This systematic way of obtaining influence line, bending moment, shear force diagrams and deformed shape for the beams with geometric and load discontinuities has been discussed in this paper. Buckling loads and natural frequencies of any beam prismatic or non-prismatic with any type of support conditions can be evaluated with ease.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395753
|
oai_dc
|
Vibration of mitred and smooth pipe bends and their components
|
Vibration of mitred and smooth pipe bends and their components
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"D. Redekop(University of Ottawa); D. Chang(University of Ottawa)"
] |
In this work, the linear vibration characteristics of 90o pipe bends and their cylindrical and toroidal shell components are studied. The finite element method, based on shear-deformation shell elements, is used to carry out a vibration analysis of metallic multiple 90o mitred pipe bends. Single, double, and triple mitred bends are considered, as well as a smooth bend. Sample natural frequencies and mode shapes are given. To validate the procedure, comparison of the natural frequencies is made with existing results for cylindrical and toroidal shells. The influence of the multiplicity of the bend, the
boundary conditions, and the various geometric parameters on the natural frequency is described. The differential quadrature method, based on classical shell theory, is used to study the vibration of components of these bends. Regression formulas are derived for cylindrical shells (straight pipes) with one or two oblique edges, and for sectorial toroidal shells (curved pipes, pipe elbows). Two types of support are considered for each case. The results given provide information about the vibration characteristics of pipe bends over a wide range of the geometric parameters.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395629
|
oai_dc
|
Crack identification in short shafts using wavelet-based element and neural networks
|
Crack identification in short shafts using wavelet-based element and neural networks
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jiawei Xiang(Guilin University of Electronic Technology); Xuefeng Chen(Xi’an Jiaotong University); Lianfa Yang(Guilin University of Electronic Technology)"
] |
The rotating Rayleigh-Timoshenko beam element based on B-spline wavelet on the interval (BSWI) is constructed to discrete short shaft and stiffness disc. The crack is represented by nondimensional linear spring using linear fracture mechanics theory. The wavelet-based finite element model of rotor system is constructed to solve the first three natural frequencies functions of normalized crack location and depth. The normalized crack location, normalized crack depth and the first three natural frequencies are then employed as the training samples to achieve the neural networks for crack diagnosis. Measured natural frequencies are served as inputs of the trained neural networks and the normalized crack location and depth can be identified. The experimental results of fatigue crack in short shaft is also given.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395635
|
oai_dc
|
Fast analytical estimation of the influence zone depth,its numerical verification and FEM accuracy testing
|
Fast analytical estimation of the influence zone depth,its numerical verification and FEM accuracy testing
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Pavel Kuklik(Czech Technical University in Prague); Miroslav Broucek(Czech Technical University in Prague); Marie Kopácková(Czech Technical University in Prague)"
] |
For the calculation of foundation settlement it is recommended to take into account so called influence zone inside the subsoil bellow the foundation structure. Influence zone inside the subsoil is the region where the load has a substantial influence on the deformation of the soil skeleton. The soil skeleton is pre-consolidated or over consolidated due to the original geostatic stress state. An excavation changes the original geostatic stress state and it creates the space for the load transferred from upper structure. The theory of elastic layer in Westergard manner is selected for the vertical stress calculation. The depth of influence zone is calculated from the equality of the original geostatic stress and the new geostatic stress due to excavation combined with the vertical stress from the upper structure. Two close formulas are presented for the influence zone calculation. Using ADINA code we carried out several numerical examples to verify the proposed analytical formulas and to enhance their use in civil engineering practice. Otherwise, the FEM code accuracy can be control.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395636
|
oai_dc
|
Experimental investigation of performance in L-shaped wall to wall corner connections of 3D Panels subjected to lateral cyclic loading
|
Experimental investigation of performance in L-shaped wall to wall corner connections of 3D Panels subjected to lateral cyclic loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.Z. Kabir(Amirkabir University of Technology); R. Vasheghani-Farahani(Amirkabir University of Technology)"
] |
토목공학
| null |
kci_detailed_000079.xml
|
||||
ART001395637
|
oai_dc
|
Experimental study on seismic behavior of high strength reinforced concrete frame columns with high axial compression ratios
|
Experimental study on seismic behavior of high strength reinforced concrete frame columns with high axial compression ratios
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Guojun Zhang(Shanghai Normal University); Jianxin Liu(Shanghai Normal University); Guoliang Bai(Xi'an University of Architecture and Technology); Boquan Liu(Chang'an University)"
] |
토목공학
| null |
kci_detailed_000079.xml
|
||||
ART001395630
|
oai_dc
|
On the steel cost of circular flat-bottomed silos designed using the Eurocodes
|
On the steel cost of circular flat-bottomed silos designed using the Eurocodes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Carlos Gonzalez-Montellano(Universidad Politecnica de Madrid); Alvaro Ramirez(Universidad Politecnica de Madrid); Eutiquio Gallego(Universidad Politecnica de Madrid); Francisco Ayuga(Universidad Politecnica de Madrid)"
] |
Nowadays, Eurocodes have become the reference standards for silo design within the European Union. They include new procedures for load assessment and structural verifications aiming to design safer silos. However, many silo manufacturers are still reluctant to use them (or at least all their prescriptions) because of the loss of competitiveness they are experiencing in comparison with former standards. This paper shows how steel cost of flat-bottomed circular silos varies when different silo geometries and stored materials are considered. The influence of critical structural verifications on steel costs, such as buckling of the silo wall, were also analyzed and some conclusions and practical recommendations for silo designers were proposed.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395631
|
oai_dc
|
An assumed-stress hybrid element for modeling of plates with shear deformations on elastic foundation
|
An assumed-stress hybrid element for modeling of plates with shear deformations on elastic foundation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kutlu Darilmaz(Istanbul Technical University)"
] |
In this paper a four-node hybrid stress element is proposed for analysing arbitrarily shaped plates on a two parameter elastic foundation. The element is developed by combining a hybrid plate stress element and a soil element. The formulation is based on Hellinger-Reissner variational principle in which both inter element compatible boundary displacement and equilibrated stress fields for the plate as well as the foundation are chosen separately. This formulation also allows a low order polynomial interpolation functions. Numerical examples are presented to show that the validity and efficiency of the present element for the plate analysis resting on an elastic foundation. In these examples the effect of soil depth,interaction between closed plates on soil parameters, comparison with Winkler hypothesis is investigated.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395632
|
oai_dc
|
Load spectra growth modelling and extrapolation with REBMIX
|
Load spectra growth modelling and extrapolation with REBMIX
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Matej Volk(University of Ljubljana); Matija Fajdiga(University of Ljubljana); Marko Nagode(University of Ljubljana)"
] |
In the field of predicting structural safety and reliability the operating conditions play an essential role. Since the time and cost limitations are a significant factors in engineering it is important to predict the future operating conditions as close to the actual state as possible from small amount of available data. Because of the randomness of the environment the shape of measured load spectra can vary considerably and therefore simple distribution functions are frequently not sufficient for their modelling. Thus mixed distribution functions have to be used. In general their major weakness is the complicated calculation of unknown parameters. The scope of the paper is to investigate the load spectra growth for actual operating conditions and to investigate the modelling and extrapolation of load spectra
with algorithm for mixed distribution estimation, REBMIX. The data obtained from the measurements of wheel forces and the braking moment on proving ground is used to generate load spectra.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395633
|
oai_dc
|
Numerical simulation of an external prestressing technique for prestressed concrete end block
|
Numerical simulation of an external prestressing technique for prestressed concrete end block
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Rama Chandra Murthy(Structural Engineering Research Centre); S. Chitra Ganapathi(Structural Engineering Research Centre); S. Saibabu(Structural Engineering Research Centre); N. Lakshmanan(Structural Engineering Research Centre); R. Jayaraman(Structural Engineering Research Centre); R. Senthil(Anna University)"
] |
This paper presents the details of finite element (FE) modeling and analysis of an external prestressing technique to strengthen a prestressed concrete (PSC) end block. Various methods of external prestressing techniques have been discussed. In the proposed technique, transfer of external force is in shear mode on the end block creating a complex stress distribution. The proposed technique is useful when the ends of the PSC girders are not accessible. Finite element modeling issues have been outlined. Brief description about material nonlinearity including key aspects in modeling inelastic behaviour has been provided. Finite element (FE) modeling including material, loading has been explained in depth. FE analysis for linear and nonlinear static analysis has been conducted for varying external loadings. Various responses such as out-of-plane deformation and slip have been computed and compared with the corresponding experimental observations. From the study, it has been observed that the computed slope and slip of the steel bracket under external loading is in good agreement with the corresponding experimental observations.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001395634
|
oai_dc
|
Numerical comparison of the beam model and 2D linearized elasticity
|
Numerical comparison of the beam model and 2D linearized elasticity
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Eva Fabijanic(Pliva d.d.); Josip Tambaca(University of Zagreb)"
] |
In this paper we compare the solution of the one-dimensional beam model and the numerical solution of the two-dimensional linearized elasticity problem for rectangular domain of the beam-like form. We first derive the beam model starting from the two-dimensional linearized elasticity, the same way it is derived from the three-dimensional linearized elasticity. Then we present the numerical solution of the two-dimensional problem by finite element method. As expected the difference of two approximations becomes smaller as the thickness of the beam tends to zero. We then analyze the
applicability of the one-dimensional model and verify the main properties of the beam modeling for thin beams.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001419991
|
oai_dc
|
Free transverse vibrations of an elastically connected simply supported twin pipe system
|
Free transverse vibrations of an elastically connected simply supported twin pipe system
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Müge Balkaya(Istanbul Technical University); Metin O. Kaya(Istanbul Technical University); Ahmet Sa lamer(Istanbul Technical University)"
] |
In this paper, free vibration analyses of a parallel placed twin pipe system simulated by simply supported-simply supported and fixed-fixed Euler-Bernoulli beams resting on Winkler elastic soil are presented. The motion of the system is described by a homogenous set of two partial differential equations, which is solved by a simulation method called the Differential Transform Method (DTM). Free vibrations of an elastically connected twin pipe system are realized by synchronous and asynchronous deflections. The results of the presented theoretical analyses for simply supported Euler-Bernoulli beams are compared with existing ones in open literature and very good agreement is demonstrated.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001419997
|
oai_dc
|
Cable vibration control with a semiactive MR damper-numerical simulation and experimental verification
|
Cable vibration control with a semiactive MR damper-numerical simulation and experimental verification
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"W.J. Wu(Louisiana State University); C.S. Cai(Louisiana State University)"
] |
Excessive stay cable vibrations can cause severe problems for cable-stayed bridges. In this paper a semiactive Magnetorheological (MR) damper is investigated to reduce cable vibrations. The control-oriented cable-damper model is first established; a computer simulation for the cable-damper system is carried out; and finally a MR damper is experimentally used to reduce the cable vibration in a laboratory environment using a semiactive control algorithm. Both the simulation and experimental results show that the semiactive MR damper achieves better control results than the corresponding passive damper.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001420001
|
oai_dc
|
Further seismic displacement PSDF results
|
Further seismic displacement PSDF results
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"C.A. Morales(Universidad Simón Bolívar)"
] |
The spectral content of ground displacement of the 10 largest last California earthquakes is studied. Specifically, the power spectral density function of the critical horizontal-component record of the closest-to-epicenter station is analyzed in each case. The results permit to state that horizontal ground displacement is a narrow-band process. This fact was previously noticed while trying to solve the largebase-displacement problem in isolated structures and it was fundamental in the solution of this issue; however, these preliminary results were limited in number to enable a statement like the foregoing one. Thus, the broader results presented herein were necessary.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001419992
|
oai_dc
|
Behavior of strengthened reinforced concrete coupling beams by bolted steel plates, Part 2: Evaluation of theoretical strength
|
Behavior of strengthened reinforced concrete coupling beams by bolted steel plates, Part 2: Evaluation of theoretical strength
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Y. Zhu(The University of Guang Zhou); R.K.L. Su(The University of Hong Kong)"
] |
Composite beams using bolts to attach steel plates to the side faces of existing reinforced concrete (RC) coupling beams can enhance both their strength and deformability. The behavior of those composite beams differs substantially from the behavior of typical composite beams made up of steel beams and concrete slabs. The former are subjected to longitudinal, vertical and rotational slips, while the latter only involve longitudinal slip. In this study, a mixed analysis method was adopted to develop the fundamental equations for accurate prediction of the load-carrying capacity of steel plate strengthened RC coupling beams. Then, a rigid plastic analysis technique was used to cope with the full composite effect of the bolt group connections. Two theoretical models for the determination of the strength of mediumlength plate strengthened coupling beams based on mixed analysis and rigid plastic methods are presented. The strength of the strengthened coupling beams is derived. The vertical and longitudinal slips of the steel plates and the shear strength of the anchor-bolt connection group is considered. The theoretical models are validated by the available experimental results presented in a companion paper. The strength of the specimens predicted from the mixed analysis model is found to be in good agreement with that from the experimental results.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001420000
|
oai_dc
|
Effect of superstructure-abutment continuity on live load distribution in integral abutment bridge girders
|
Effect of superstructure-abutment continuity on live load distribution in integral abutment bridge girders
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Murat Dicleli(Middle East Technical University); Semih Erhan(Middle East Technical University)"
] |
In this study, the effect of superstructure-abutment continuity on the distribution of live load effects among the girders of integral abutment bridges (IABs) is investigated. For this purpose, two and three dimensional finite element models of several single-span, symmetrical integral abutment and simply supported (jointed) bridges (SSBs) are built and analyzed. In the analyses, the effect of various superstructure properties such as span length, number of design lanes, girder size and spacing as well as slab thickness are considered. The results from the analyses of two and three dimensional finite element models are then used to calculate the live load distribution factors (LLDFs) for the girders of IABs and SSBs as a function of the above mentioned parameters. LLDFs for the girders are also calculated using the AASHTO formulae developed for SSBs. Comparison of the analyses results revealed that the superstructure-abutment continuity in IABs produces a better distribution of live load effects among the girders compared to SSBs. The continuity effects become more predominant for short span IABs.
Furthermore, AASHTO live load distribution formulae developed for SSBs lead to conservative estimates of live load girder moments and shears for short-span IABs.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001419995
|
oai_dc
|
Optimal laminate sequence of thin-walled composite beams of generic section using evolution strategies
|
Optimal laminate sequence of thin-walled composite beams of generic section using evolution strategies
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Rajasekaran(PSG College of Technology)"
] |
A problem formulation and solution methodology for design optimization of laminated thinwalled composite beams of generic section is presented. Objective functions and constraint equations are given in the form of beam stiffness. For two different problems one for open section and the other for closed section, the objective function considered is bending stiffness about x-axis. Depending upon the case, one can consider bending, torsional and axial stiffnesses. The different search and optimization algorithm, known as Evolution Strategies (ES) has been applied to find the optimal fibre orientation of composite laminates. A multi-level optimization approach is also implemented by narrowing down the size of search space for individual design variables in each successive level of optimization process. The numerical results presented demonstrate the computational advantage of the proposed method "Evolution strategies" which become pronounced to solve optimization of thin-walled composite beams of generic section.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001419993
|
oai_dc
|
Evolutionary topology optimization of geometrically and materially nonlinear structures under prescribed design load
|
Evolutionary topology optimization of geometrically and materially nonlinear structures under prescribed design load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"X. Huang(RMIT University); Y.M. Xie(RMIT University)"
] |
This paper presents topology optimization of geometrically and materially nonlinear structures using a bi-directional evolutionary optimization (BESO) method. To maximum the stiffness of nonlinear structures under prescribed design load, the complementary work is selected as the objective function of the optimization. An optimal design can be obtained by gradually removing inefficient material and adding efficient ones. The proposed method can be applied to a series of geometrically and/or materially nonlinear structures. The results show considerable differences in topologies and stiffness of the optimal designs for linear and nonlinear structures. It is found that the optimal designs for nonlinear structures are much stiffer than those for linear structures when large design loads (which result in significantly nonlinear deformations) are applied.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001419999
|
oai_dc
|
New accuracy indicator to quantify the true and false modes for eigensystem realization algorithm
|
New accuracy indicator to quantify the true and false modes for eigensystem realization algorithm
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shuqing Wang(Ocean University of China); Fushun Liu(Ocean University of China)"
] |
The objective of this paper is to apply a new proposed accuracy indicator to quantify the true and false modes for Eigensystem Realization Algorithm using output-based responses. First, a discrete mass-spring system and a simply supported continuous beam were modelled using finite element method.
Then responses are simulated under random excitation. Natural Excitation Technique using only response measurements is applied to compute the impulse responses. Eigensystem Realization Algorithm is employed to identify the modal parameters on the simulated responses. A new accuracy indicator,Normalized Occurrence Number-NON, is developed to quantitatively partition the realized modes into true and false modes so that the false portions can be disregarded. Numerical simulation demonstrates that the new accuracy indicator can determine the true system modes accurately.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001418009
|
oai_dc
|
New formulation for vibration analysis of Timoshenko beam with double-sided cracks
|
New formulation for vibration analysis of Timoshenko beam with double-sided cracks
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.R. Ayatollahi(Iran University of Science and Technology); R. Hashemi(Iran University of Science and Technology); H. Rokhi(Iran University of Science and Technology)"
] |
It is the intention of this study to synthesize the effects of double-edge cracks on the dynamic characteristics of a beam. The stiffness matrix is first determined for a Timoshenko beam containing two same-line edge cracks. The presented model is then developed for elements with two parallel double-sided cracks, considering the interaction between the stress fields of adjacent cracks. Finally, a finite element code is implemented, to examine the influence of depth and location of double cracks, on the natural frequencies of the damaged system.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001418020
|
oai_dc
|
Static configurations of cables in cable stayed bridges
|
Static configurations of cables in cable stayed bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.Y. Ren(Tongji University); M. Gu(Tongji University)"
] |
토목공학
| null |
kci_detailed_000079.xml
|
||||
ART001418018
|
oai_dc
|
Profiled sheets - the optimum vs the oft used
|
Profiled sheets - the optimum vs the oft used
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K.S. Babu Narayan(National Institute of Technology Karnataka Surathkal)"
] |
토목공학
| null |
kci_detailed_000079.xml
|
||||
ART001418015
|
oai_dc
|
Non-linear vibration and stability analysis of an axially moving rotor in sub-critical transporting speed range
|
Non-linear vibration and stability analysis of an axially moving rotor in sub-critical transporting speed range
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mergen H. Ghayesh(McGill University); Mohammad R. Ghazavi(Tarbiat Modarres University); Siamak E. Khadem(Tarbiat Modarres University)"
] |
Parametric and forced non-linear vibrations of an axially moving rotor both in non-resonance and near-resonance cases have been investigated analytically in this paper. The axial speed is assumed to involve a mean value along with small harmonic fluctuations. Hamilton’s principle is employed for this gyroscopic system to derive three coupled non-linear equations of motion. Longitudinal inertia is neglected under the quasi-static stretch assumption and two integro-partial-differential equations are obtained. With introducing a complex variable, the equations of motion is presented in the form of a single, complex equation. The method of multiple scales is applied directly to the resulting equation and the approximate closed-form solution is obtained. Stability boundaries for the steady-state response are formulated and the frequency-response curves are drawn. A number of case studies are considered and the numerical simulations are presented to highlight the effects of system parameters on the linear and nonlinear natural frequencies, mode shapes, limit cycles and the frequency-response curves of the system.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001418017
|
oai_dc
|
Time-dependent and inelastic behaviors of fiber- and particle hybrid composites
|
Time-dependent and inelastic behaviors of fiber- and particle hybrid composites
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jeongsik Kim(Texas A&M University); Anastasia Muliana(Texas A&M University)"
] |
Polymer matrix composites are widely used in many engineering applications as they can be customized to meet a desired performance while not only maintaining low cost but also reducing weight. Polymers can experience viscoelastic-viscoplastic response when subjected to external loadings. Various reinforcements and fillers are added to polymers which bring out more complexity in analyzing the timedependent response. This study formulates an integrated micromechanical model and finite element (FE) analysis for predicting effective viscoelastic-viscoplastic response of polymer based hybrid composites. The studied hybrid system consists of unidirectional short-fiber reinforcements and a matrix system which is composed of solid spherical particle fillers dispersed in a homogeneous polymer constituent. The goal is to predict effective performance of hybrid systems having different compositions and properties of the fiber, particle, and matrix constituents. A combined Schapery’s viscoelastic integral model and Valanis’s endochronic viscoplastic model is used for the polymer constituent. The particle and fiber constituents are assumed linear elastic. A previously developed micromechanical model of particle reinforced composite is first used to obtain effective mechanical properties of the matrix systems. The effective properties of the matrix are then integrated to a unit-cell model of short-fiber reinforced composites, which is generated using the FE. The effective properties of the matrix are implemented using a user material subroutine in the FE framework. Limited experimental data and analytical solutions available in the literatures are used for comparisons.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001418007
|
oai_dc
|
Steady-state response and free vibration of an embedded imperfect smart functionally graded hollow cylinder filled with compressible fluid
|
Steady-state response and free vibration of an embedded imperfect smart functionally graded hollow cylinder filled with compressible fluid
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Z.G. Bian(Zhejiang University); W.Q. Chen(Zhejiang University,); J. Zhao(Quzhou Highway Management Department)"
] |
A smart hollow cylinder consisting of a host functionally graded elastic core layer and two surface homogeneous piezoelectric layers is presented in this paper. The bonding between the layers can be perfect or imperfect, depending on the parameters taken in the general linear spring-layer interface model. The effect of such weak interfaces on free vibration and steady-state response is then investigated. Piezoelectric layers at inner and outer surfaces are polarized axially or radially and act as a sensor and an actuator respectively. For a simply supported condition, the state equations with non-constant coefficients are obtained directly from the formulations of elasticity/piezoelasticity. An approximate laminated model is then introduced for the sake of solving the state equations conveniently. It is further assumed that the hollow cylinder is embedded in an elastic medium and is simultaneously filled with compressible fluid. The interaction between the structure and its surrounding media is taken into account. Numerical examples are finally given with discussions on the effect of some related parameters.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001418002
|
oai_dc
|
An exact solution for free vibrations of a non-uniform beam carrying multiple elastic-supported rigid bars
|
An exact solution for free vibrations of a non-uniform beam carrying multiple elastic-supported rigid bars
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hsien-Yuan Lin(Cheng Shiu University)"
] |
The purpose of this paper is to utilize the numerical assembly method (NAM) to determine the exact natural frequencies and mode shapes of a multi-step beam carrying multiple rigid bars, with each of the rigid bars possessing its own mass and rotary inertia, fixed to the beam at one point and supported by a translational spring and/or a rotational spring at another point. Where the fixed point of each rigid bar with the beam does not coincide with the center of gravity the rigid bar or the supporting point of the springs. The effects of the distance between the "fixed point" of each rigid bar and its center of gravity (i.e., eccentricity), and the distance between the "fixed point" and each linear spring (i.e., offset) are studied. For a beam carrying multiple various concentrated elements, the magnitude of each lumped mass and stiffness of each linear spring are the well-known key parameters affecting the free vibration characteristics of the (loaded) beam in the existing literature, however, the numerical results of this paper reveal that the eccentricity of each rigid bar and the offset of each linear spring are also the predominant parameters.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001418012
|
oai_dc
|
Nonlinear free vibration of heated corrugated annular plates with a centric rigid mass
|
Nonlinear free vibration of heated corrugated annular plates with a centric rigid mass
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yong-Gang Wang(China Agricultural University); Dan Li(China Agricultural University); Ze-Jun Feng(China Agricultural University)"
] |
A computational analysis of the nonlinear free vibration of corrugated annular plates with shallow sinusoidal corrugations under uniformly static ambient temperature is examined. The governing equations based on Hamilton’s principle and nonlinear bending theory of thin shallow shell are established for a corrugated plate with a concentric rigid mass at the center and rotational springs at the outer edges. A simple harmonic function in time is assumed and the time variable is eliminated from partial differential governing equations using the Kantorovich averaging procedure. The resulting ordinary equations, which form a nonlinear two-point boundary value problem in spatial variable, are then solved numerically by shooting method, and the temperature-dependent characteristic relations of frequency vs. amplitude for nonlinear vibration of heated corrugated annular plates are obtained. Several numerical results are presented in both tabular and graphical forms, which demonstrate the accuracy of present method and illustrate the amplitude frequency dependence for the plate under such parameters as ambient temperature, plate geometry, rigid mass and elastic constrain.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001418003
|
oai_dc
|
Homogenized limit analysis of masonry structures with random input properties: polynomial Response Surface approximation and Monte Carlo simulations
|
Homogenized limit analysis of masonry structures with random input properties: polynomial Response Surface approximation and Monte Carlo simulations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"G. Milani(Politecnico di Milano); D. Benasciutti(University of Udine)"
] |
The uncertainty often observed in experimental strengths of masonry constituents makes critical the selection of the appropriate inputs in finite element analysis of complex masonry buildings, as well as requires modelling the building ultimate load as a random variable. On the other hand, the utilization of expensive Monte Carlo simulations to estimate collapse load probability distributions may become computationally impractical when a single analysis of a complex building requires hours of computer calculations. To reduce the computational cost of Monte Carlo simulations, direct computer calculations can be replaced with inexpensive Response Surface (RS) models. This work investigates the use of RS models in Monte Carlo analysis of complex masonry buildings with random input parameters. The accuracy of the estimated RS models, as well as the good estimations of the collapse load cumulative distributions obtained via polynomial RS models, show how the proposed approach could be a useful tool in problems of technical interest.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001351755
|
oai_dc
|
An efficient FE model for dynamic instability analysis of imperfect composite laminates
|
An efficient FE model for dynamic instability analysis of imperfect composite laminates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Anupam Chakrabarti(Indian Institute of Technology Roorkee)"
] |
토목공학
| null |
kci_detailed_000079.xml
|
||||
ART001470950
|
oai_dc
|
Resisting capacity of Korean traditional wooden structural systems subjected to static loading
|
Resisting capacity of Korean traditional wooden structural systems subjected to static loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"황종국(한국전통문화대학교); Samuel Kwak(Korean Minjok Leadership Academy); Ji-Hyun Kwak(KAIST)"
] |
This paper investigates the structural behavior of Korean traditional wooden structures on the basis of the structural analysis using the commercialized program, SAP 2000. All the structural systems were analyzed, and the rotational stiffness at each joint was inferred from the experimental result for a half scale model of Bongjeong-sa (a temple in South Korea). In addition, the artificial control of analysis parameters was prevented because the structural analysis was focused on the realization of the most exact structural behavior of real structures. The analysis was carried out for the horizontal and vertical static loads, and all the secondary members were excluded in the structural analysis. The obtained results show that the resisting capacity of the primary structural system is greater than that of the expanding structural system.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001351694
|
oai_dc
|
Static displacement and elastic buckling characteristics of structural pipe-in-pipe cross-sections
|
Static displacement and elastic buckling characteristics of structural pipe-in-pipe cross-sections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Sato(Hokkaido University); M. H. Patel(Cranfield University); F. Trarieux(Cranfield University)"
] |
Structural pipe-in-pipe cross-sections have significant potential for application in offshore oil and gas production systems because of their property that combines insulation performance with structural strength in an integrated way. Such cross-sections comprise inner and outer thin walled pipes with the annulus between them fully filled by a selectable thick filler material to impart an appropriate combination of properties. Structural pipe-in-pipe cross-sections can exhibit several different collapse mechanisms and the basis of the preferential occurrence of one over others is of interest. This paper presents an elastic analyses of a structural pipe-in-pipe cross-section when subjected to external hydrostatic pressure. It formulates and solves the static and elastic buckling problem using the variational principle of minimum potential energy. The paper also investigates a simplified formulation of the
problem where the outer pipe and its contact with the filler material is considered as a ‘pipe on an elastic foundation’. Results are presented to show the variation of elastic buckling pressure with the relative elastic modulus of the filler and pipe materials, the filler thickness and the thicknesses of the inner and outer pipes. The range of applicability of the simplified ‘pipe on an elastic foundation’ analysis is also presented. A brief review of the types of materials that could be used as the filler is combined with the results of the analysis to draw conclusions about elastic buckling behaviour of structural pipe-in-pipe cross-sections.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001351747
|
oai_dc
|
Dynamics of an elastic beam and a jumping oscillator moving in the longitudinal direction of the beam
|
Dynamics of an elastic beam and a jumping oscillator moving in the longitudinal direction of the beam
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Luis Baeza(Universidad Politécnica de Valencia); Huajiang Ouyang(University of Liverpool)"
] |
An oscillator of two lumped masses linked through a vertical spring moves forward in the horizontal direction, initially at a certain height, over a horizontal Euler beam and descends on it due to its own weight. Vibration of the beam and the oscillator is excited at the onset of the ensuing impact. The
impact produced by the descending oscillator is assumed to be either perfectly elastic or perfectly plastic.
If the impact is perfectly elastic, the oscillator bounces off and hits the beam a number of times as it moves forward in the longitudinal direction of the beam, exchanging its dynamics with that of the beam.
If the impact is perfectly plastic, the oscillator (initially) sticks to the beam after its first impact and then may separate and reattach to the beam as it moves along the beam. Further events of separation and reattachment may follow. This interesting and seemingly simple dynamic problem actually displays rather
complicated dynamic behaviour and has never been studied in the past. It is found through simulated numerical examples that multiple events of separation and impact can take place for both perfectly elastic impact and perfectly plastic impact (though more of these in the case of perfectly elastic impact) and the dynamic response of the oscillator and the beam looks noisy when there is an event of impact because impact excites higher-frequency components. For the perfectly plastic impact, the oscillator can experience
multiple events of consecutive separation from the beam and subsequent reattachment to it.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001351702
|
oai_dc
|
Exact integration for the hypersingular boundary integral equation of two-dimensional elastostatics
|
Exact integration for the hypersingular boundary integral equation of two-dimensional elastostatics
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xiaosong Zhang(Shijiazhuang Railway Institute,); Xiaoxian Zhang(The University of Liverpool)"
] |
This paper presents an exact integration for the hypersingular boundary integral equation of two-dimensional elastostatics. The boundary is discretized by straight segments and the physical variables are approximated by discontinuous quadratic elements. The integral for the hypersingular boundary integral equation analysis is given in a closed form. It is proven that using the exact integration for discontinuous boundary element, the singular integral in the Cauchy Principal Value and the hypersingular integral in the Hadamard Finite Part can be obtained straightforward without special treatment. Two numerical examples are implemented to verify the correctness of the derived exact integration.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001351720
|
oai_dc
|
Variations of the stress intensity factors for a planar crack parallel to a bimaterial interface
|
Variations of the stress intensity factors for a planar crack parallel to a bimaterial interface
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Chunhui Xu(China Agricultural University); Taiyan Qin(China Agricultural University); Li Yuan(China Agricultural University); Nao-Aki Noda(Kyushu Institute of Technology)"
] |
Stress intensity factors for a planar crack parallel to a bimaterial interface are considered. The formulation leads to a system of hypersingular integral equations whose unknowns are three modes of crack opening displacements. In the numerical analysis, the unknown displacement discontinuities are approximated by the products of the fundamental density functions and polynomials. The numerical results show that the present method yields smooth variations of stress intensity factors along the crack
front accurately. The mixed mode stress intensity factors are indicated in tables and figures with varying the shape of crack, distance from the interface, and elastic constants. It is found that the maximum stress
intensity factors normalized by root area are always insensitive to the crack aspect ratio. They are given in a form of formula useful for engineering applications.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001351733
|
oai_dc
|
Bound of aspect ratio of base-isolated buildings considering nonlinear tensile behavior of rubber bearing
|
Bound of aspect ratio of base-isolated buildings considering nonlinear tensile behavior of rubber bearing
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J. Hino(Kyoto University); S. Yoshitomi(Kyoto University); M. Tsuji(Kyoto University); I. Takewaki(Kyoto University)"
] |
The purpose of this paper is to propose a simple analysis method of axial deformation of base-isolation rubber bearings in a building subjected to earthquake loading and present its applicability to the analysis of the bound of the aspect ratio of base-isolated buildings. The base shear coefficient is
introduced as a key parameter for the bound analysis. The bound of the aspect ratio of base-isolated buildings is analyzed based on the relationship of the following four quantities; (i) ultimate state of the tensile stress of rubber bearings based on a proposed simple recursive analysis for seismic loading, (ii) ultimate state of drift of the base-isolation story for seismic loading, (iii) ultimate state of the axial compressive stress of rubber bearings under dead loads, (iv) prediction of the overturning moment at the base for seismic loading. In particular, a new recursive analysis method of axial deformation of rubber bearings is presented taking into account the nonlinear tensile behavior of rubber bearings and it is shown that the relaxation of the constraint on the ultimate state of the tensile stress of rubber bearings increases the limiting aspect ratio.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001470956
|
oai_dc
|
A framework for distributed analytical and hybrid simulations
|
A framework for distributed analytical and hybrid simulations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Oh-Sung Kwon(Missouri University of Science and Technology); Amr S. Elnashai(University of Illinois at Urbana-Champaign); Billie F. Spencer(University of Illinois at Urbana-Champaign)"
] |
A framework for multi-platform analytical and multi-component hybrid (testing-analysis) simulations is described in this paper and illustrated with several application examples. The framework allows the integration of various analytical platforms and geographically distributed experimental facilities
into a comprehensive pseudo-dynamic hybrid simulation. The object-oriented architecture of the framework enables easy inclusion of new analysis platforms or experimental models, and the addition of a multitude of auxiliary components, such as data acquisition and camera control. Four application examples are given, namely; (i) multi-platform analysis of a bridge with soil and structural models, (ii) multiplatform, multi-resolution analysis of a high-rise building, (iii) three-site small scale frame hybrid simulation, and (iv) three-site large scale bridge hybrid simulation. These simulations serve as illustrative examples of collaborative research among geographically distributed researchers employing different analysis platforms and testing equipment. The versatility of the framework, ease of including additional
modules and the wide application potential demonstrated in the paper provide a rich research environment for structural and geotechnical engineering.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001350326
|
oai_dc
|
Numerical simulation of relation between interface topography and residual stress in thermal barrier coatings
|
Numerical simulation of relation between interface topography and residual stress in thermal barrier coatings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Guo-Feng Yao(Jilin University); Hong-Mei Ma(Jilin University); Lin-wen Zhang(Jilin College of Traffic Profession Technique)"
] |
With respect to thermal barrier coating, the analysis of interface cohesion and residual stress is important to the life of TBC from mechanical view point. Up to now, there is not a model of describing interface cohesion. In the paper, we give a simple model of computing residual stress and study the residual stress of TBC with ANSYS. The distribution of the residual stress in different interface topography and the relationship between the residual stress and the interface topography dimension are presented.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001350331
|
oai_dc
|
The vertical spanning strip wall as a coupled rocking rigid body assembly
|
The vertical spanning strip wall as a coupled rocking rigid body assembly
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Luigi Sorrentino(Sapienza University); Renato Masiani(Sapienza University); Michael C. Griffith(The University of Adelaide)"
] |
The equation of motion of a one way (vertical) spanning strip wall, as an assembly of two rigid bodies, is presented. Only one degree of freedom is needed to completely describe the wall response as the bodies are assumed to be perfectly rectangular and are allowed to rock but not to slide horizontally.
Furthermore, no arching action occurs since vertical motion of the upper body is not restrained.
Consequently, the equation of motion is nonlinear, with non constant coefficients and a Coriolis acceleration term. Phenomena associated with overburden to self weight ratio, motion triggering, impulsive energy dissipation, amplitude dependency of damping and period of vibration, and scale effect are discussed, contributing to a more complete understanding of experimental observations and to an estimation of system parameters based on the wall characteristics, such as intermediate hinge height and
energy damping, necessary to perform nonlinear time history analyses. A comparison to a simple standing, or parapet, wall is developed in order to better highlight the characteristics of this assembly.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001350307
|
oai_dc
|
Frequency analysis of moderately thick uniform isotropic annular plates by discrete singular convolution method
|
Frequency analysis of moderately thick uniform isotropic annular plates by discrete singular convolution method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ömer Civalek(Akdeniz University); Hakan Ersoy(Akdeniz University)"
] |
In the present study, free vibration analysis of thick annular plates is analyzed by discrete singular convolution method. The Mindlin plate theory is employed. The material is isotropic, homogeneous and obeys Hook’s law. In this paper, discrete singular convolution method is used for discretization of equations of motion. Axisymmetric frequency values are presented illustrating the effect of radius ratio and thickness to radius ratio of the annular plate. The influence of boundary conditions on the frequency characteristics is also discussed. Comparing results with those in the literature validates the
present analysis. It is shown that the obtained results are very accurate by this approach.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001350273
|
oai_dc
|
Dynamic analysis of guideway structures by considering ultra high-speed Maglev train-guideway interaction
|
Dynamic analysis of guideway structures by considering ultra high-speed Maglev train-guideway interaction
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Myung-Kwan Song(Doosan Heavy Industries & Construction); Yozo Fujino(The University of Tokyo)"
] |
In this study, the new three-dimensional finite element analysis model of guideway structures considering ultra high-speed magnetic levitation train-bridge interaction, in which the various improved finite elements are used to model structural members, is proposed. The box-type bridge deck of guideway
structures is modeled by Nonconforming Flat Shell finite elements with six DOF (degrees of freedom). The sidewalls on a bridge deck are idealized by using beam finite elements and spring connecting elements. The vehicle model devised for an ultra high-speed Maglev train is employed, which is
composed of rigid bodies with concentrated mass. The characteristics of levitation and guidance force, which exist between the super-conducting magnet and guideway, are modeled with the equivalent spring model. By Lagrange’s equations of motion, the equations of motion of Maglev train are formulated. Finally, by deriving the equations of the force acting on the guideway considering Maglev train-bridge interaction, the complete system matrices of Maglev train-guideway structure system are composed.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001350338
|
oai_dc
|
Postbuckling response and failure of symmetric laminated plates with rectangular cutouts under uniaxial compression
|
Postbuckling response and failure of symmetric laminated plates with rectangular cutouts under uniaxial compression
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. B. Singh(Birla Institute of Technology and Science Pilani); Dinesh Kumar(Birla Institute of Technology and Science Pilani)"
] |
This paper deals with the buckling and postbuckling responses and the progressive failure of square symmetric laminates with rectangular cutouts under uniaxial compression. A detailed investigation is made to show the effects of cutout size and cutout aspect ratio on prebuckling and postbuckling
responses, failure loads and failure characteristics of (+45/−45/0/90)2s, (+45/−45)4s and (0/90)4s laminates.
The 3-D Tsai-Hill criterion is used to predict the failure of a lamina while the onset of delamination is predicted by the interlaminar failure criterion. In addition, the effects of boundary conditions on buckling load, failure loads, failure modes and maximum transverse deflection for a (+45/−45/0/90)2s laminate with and without cutout have also been presented. It is concluded that square laminates with small square cutouts have more postbuckling strength than without cutout, irrespective of boundary conditions.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001350289
|
oai_dc
|
Conceptual design of light bascule bridge
|
Conceptual design of light bascule bridge
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Weiwei Xu(Southeast University); Hanshan Ding(Southeast University); Zhitao Lu(Southeast University)"
] |
This paper proposed a conceptual design of bascule bridge, which is a new kind of movable bridge with an aim of reducing the weight of superstructure. Compared with the traditional bascule bridge, the light bascule bridge chooses cable-stayed bridge with inclined pylon as its superstructure; therefore,
the functions of balance-weight and structure will fuse into one. Otherwise, it adopts moving counterweight to adjust its center of gravity (CG) to open or close the bridge. In order to lighten the superstructure, it uses contact springs to auxiliary retract, and intelligent prestressing system (IPS) to
control the main girder's deformation. Simultaneously the vibration control scheme of structure is discussed. Starting from establishing the mechanical model of bridge, this article tries to analyze the conditions that the design parameters of structure and attachments should satisfy to. After the design
procedure was presented, an example was also adopted to explain the primary design process of this kind bridge.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001350299
|
oai_dc
|
Harmony search algorithm for optimum design of steel frame structures: A comparative study with other optimization methods
|
Harmony search algorithm for optimum design of steel frame structures: A comparative study with other optimization methods
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. O. Degertekin(Dicle University)"
] |
In this article, a harmony search algorithm is presented for optimum design of steel frame structures. Harmony search is a meta-heuristic search method which has been developed recently. It is based on the analogy between the performance process of natural music and searching for solutions of
optimization problems. The design algorithms obtain minimum weight frames by selecting suitable sections from a standard set of steel sections such as American Institute of Steel Construction (AISC) wide-flange (W) shapes. Stress constraints of AISC Load and Resistance Factor Design (LRFD) and
AISC Allowable Stress Design (ASD) specifications, maximum (lateral displacement) and interstorey drift constraints, and also size constraint for columns were imposed on frames. The results of harmony search
algorithm were compared to those of the other optimization algorithms such as genetic algorithm, optimality criterion and simulated annealing for two planar and two space frame structures taken from the literature. The comparisons showed that the harmony search algorithm yielded lighter designs for the
design examples presented.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001358154
|
oai_dc
|
A two dimensional mixed boundary-value problem in a viscoelastic medium
|
A two dimensional mixed boundary-value problem in a viscoelastic medium
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Ataoglu(Istanbul Technical University)"
] |
A fundamental solution for the transient, quasi-static, plane problems of linear viscoelasticity is introduced for a specific material. An integral equation has been found for any problem as a result of dynamic reciprocal identity which is written between this fundamental solution and the problem to be solved. The formulation is valid for the first, second and mixed boundary-value problems. This integral equation has been solved by BEM and algorithm of the BEM solution is explained on a sample, mixed boundary-value problem. The forms of time-displacement curves coincide with literature while timesurface
traction curves being quite different in the results. The formulation does not have any singularity. Generalized functions and the integrals of them are used in a different form.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001358151
|
oai_dc
|
On the assessment of modal nonlinear pushover analysis for steel frames with semi-rigid connections
|
On the assessment of modal nonlinear pushover analysis for steel frames with semi-rigid connections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Panam Zarfam(Sharif University of Technology); Massood Mofid(Sharif University of Technology)"
] |
Applying nonlinear statistical analysis methods in estimating the performance of structures in earthquakes is strongly considered these days. This is due to the methods’ simplicity, timely lower cost and reliable estimation in seismic responses in comparison with time-history nonlinear dynamic analysis. Among nonlinear methods, simplified to be incorporated in the future guidelines, Modal Pushover Analysis, known by the abbreviated name of MPA, simply models nonlinear behavior of structures; and presents a very proper estimation of nonlinear dynamic analysis using lateral load pattern appropriate to the mass. Mostly, two kinds of connecting joints, ‘hinge’ and ‘rigid’, are carried out in different type of steel structures. However, it should be highly considered that nominal hinge joints usually experience
some percentages of fixity and nominal rigid connections do not employ totally rigid. Therefore, concerning the importance of these structures and the significant flexibility effect of connections on force distribution and elements deformation, these connections can be considered as semi-rigid with various percentages of fixity. Since it seems, the application and implementation of MPA method has not been studied on moment-resistant steel frames with semi rigid connections, this research focuses on this topic and issue. In this regard several rigid and semi-rigid steel bending frames with different percentages of fixity are selected. The structural design is performed based on weak beam and strong column. Followed by that, the MPA method is used as an approximated method and Nonlinear Response History Analysis
(NL-RHA) as the exact one. Studying the performance of semi-rigid frames in height shows that MPA technique offers reasonably reliable results in these frames. The methods accuracy seems to decrease, when the number of stories increases and does decrease in correlation with the semi-rigidity percentages. This generally implies that the method can be used as a proper device in seismic estimation of different types of low and mid-rise buildings with semi-rigid connections.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001358156
|
oai_dc
|
Evaluation of thermal stability of quasi-isotropic composite/polymeric cylindrical structures under extreme climatic conditions
|
Evaluation of thermal stability of quasi-isotropic composite/polymeric cylindrical structures under extreme climatic conditions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohamed Gadalla(American University of Sharjah); Hany El Kadi(American University of Sharjah)"
] |
Thermal stability of quasi-isotropic composite and polymeric structures is considered one of the most important criteria in predicting life span of building structures. The outdoor applications of these structures have raised some legitimate concerns about their durability including moisture resistance and thermal stability. Exposure of such quasi-isotropic composite/polymeric structures to various and severe climatic conditions such as heat flux and frigid climate would change the material behavior and thermal viability and may lead to the degradation of material properties and building durability. This paper presents an analytical model for the generalized problem. This model accommodates the non-linearity and the non-homogeneity of the internal heat generated within the structure and the changes, modification to the material constants, and the structural size. The paper also investigates the effect of the incorporation of the temperature and/or material constant sensitive internal heat generation with four encountered climatic conditions on thermal stability of infinite cylindrical quasi-isotropic composite/polymeric structures. This can eventually result in the failure of such structures. Detailed critical analyses for four case studies which consider the population of the internal heat generation, cylindrical size, material constants, and four different climatic conditions are carried out. For each case of the proposed boundary
conditions, the critical thermal stability parameter is determined. The results of this paper indicate that the thermal stability parameter is critically dependent on the cylinder size, material constants/selection, the convective heat transfer coefficient, subjected heat flux and other constants accrued from the structure environment.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001358158
|
oai_dc
|
Analytical modeling of thin-walled box T-joints
|
Analytical modeling of thin-walled box T-joints
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Prabhakar R. Marur(General Motors R&D)"
] |
A general analytical method for computing the joint stiffness from the sectional properties of the members that form the joint is derived using Vlasov’s thin-walled beam theory. The analytical model of box T-joint under out-of-plane loading is investigated and validated using shell finite element results and experimental data. The analytical model of the T-joint is implemented in a beam finite element model using a revolute joint element. The out-of-plane displacement computed using the beam-joint model is compared with the corresponding shell element model. The results show close correlation between the beam revolute joint model and shell element model.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001358148
|
oai_dc
|
A study on the optimal configuration of harbor structure under the combined loads
|
A study on the optimal configuration of harbor structure under the combined loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"조규남(홍익대학교)"
] |
Response of harbor structure to environmental loads such as wave load, impact load, ship’s contacting load, is a fundamental factor in designing of the structure’s optimal configuration. In this paper, typical environmental loads against coastal structures are investigated for designing of the optimal harbor structure. Loads to be considered here are wave load, impact load and contacting load due to ship mooring. Statistical analysis for several harbor structure types under the corresponding loads is carried out, followed by investigation of effect of individual environmental load. Based on these, the optimal configuration for the harbor structure is obtained after considerable engineering process. Estimation of contacting load of the ship is suggested using effective energy concepts for the load, and analysis of structural behavior is done for the optimal designing of the structure in the particular load. A guideline for the design process of the harbor structure is established, and safety of the structure is examined by proposed scheme. For verification of the analytical approach, various steel-piled coastal structures and caissons are chosen and relevant structural analyses are carried out using the Finite Element Methods combined with MIDAS/GTS and ANSYS code. It is found using the Morison equation that impact load cannot be a major load in the typical harbor structure compared with the original wave load, and that configuration shape of the structure may play an important role in consideration of the response criteria.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001358152
|
oai_dc
|
Static and dynamic analytical and experimental analysis of 3D reinforced concrete panels
|
Static and dynamic analytical and experimental analysis of 3D reinforced concrete panels
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K. Numayr(Jordan University of Science and Technology); R. Haddad(Jordan University of Science and Technology)"
] |
A three-dimensional panel system, which was offered as a new method for construction in Jordan using relatively high strength modular panels for walls and ceilings, is investigated in this paper. The panel consists of two steel meshes on both sides of an expanded polystyrene core and connected together with a truss wire to provide a 3D system. The top face of the ceiling panel was pored with regular concrete mix, while the bottom face and both faces of the wall panels were cast by shotcreting (dry process). To investigate the structural performance of this system, an extensive experimental testing program for ceiling and wall panels subjected to static and dynamic loadings was conducted. The loaddeflection curves were obtained for beam and shear wall elements and wall elements under transverse and axial loads, respectively. Static and dynamic analyses were conducted, and the performance of the proposed structural system was evaluated and compared with a typical three dimensional reinforced
concrete frame system for buildings of the same floor areas and number of floors. Compressive strength capacity of a ceiling panel is determined for gravity loads, while flexural capacity is determined under the effect of wind and seismic loading. It was found that, the strength and serviceability requirements could be easily satisfied for buildings constructed using the three-dimensional panel system. The 3D panel system is superior to that of conventional frame system in its dynamic performance, due to its high stiffness to mass ratio.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001358161
|
oai_dc
|
Remaining life prediction of concrete structural components accounting for tension softening and size effects under fatigue loading
|
Remaining life prediction of concrete structural components accounting for tension softening and size effects under fatigue loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Rama Chandra Murthy(CSIR); G.S. Palani(CSIR); Nagesh R. Iyer(CSIR)"
] |
This paper presents analytical methodologies for remaining life prediction of plain concrete structural components considering tension softening and size effects. Non-linear fracture mechanics principles (NLFM) have been used for crack growth analysis and remaining life prediction. Various tension softening models such as linear, bi-linear, tri-linear, exponential and power curve have been presented with appropriate expressions. Size effect has been accounted for by modifying the Paris law, leading to a size adjusted Paris law, which gives crack length increment per cycle as a power function of
the amplitude of a size adjusted stress intensity factor (SIF). Details of tension softening effects and size effect in the computation of SIF and remaining life prediction have been presented. Numerical studies
have been conducted on three point bending concrete beams under constant amplitude loading. The predicted remaining life values with the combination of tension softening & size effects are in close agreement with the corresponding experimental values available in the literature for all the tension softening models.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001377741
|
oai_dc
|
Topology optimization of the structure using multimaterial inclusions
|
Topology optimization of the structure using multimaterial inclusions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ryszard KutyIowski(Wroc aw University of Technology)"
] |
In the literature the problem of the topology optimization of the structure is usually solved for one, clearly described from the mechanical point of view material. Generally the topology optimization answers the question of the distribution of this mentioned above material within the design domain. Finally,
material-voids distribution it is obtained. In this paper, for the structure mainly strengthened or sometimes weakened by the inclusions, the variation approach of the topology optimization problem is formulated. This multi material approach may be useful for the design process of various mechanical or civil engineering structures which need to be more ”refined” and more “optimal” than they can be using previous topology optimization procedures of optimization one material structures.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001377726
|
oai_dc
|
Measuring material length parameter with a new solution of microbend beam in couple stress elasto-plasticity
|
Measuring material length parameter with a new solution of microbend beam in couple stress elasto-plasticity
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Bin Ji(Dalian University of Technology); Wanji Chen(Dalian University of Technology)"
] |
토목공학
| null |
kci_detailed_000079.xml
|
||||
ART001377748
|
oai_dc
|
Structural matrices of a curved-beam element
|
Structural matrices of a curved-beam element
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"F.N. Gimena(University Public of Navarre); P. Gonzaga(University Public of Navarre); L. Gimena(University Public of Navarre)"
] |
This article presents the differential system that governs the mechanical behaviour of a curved-beam element, with varying cross-section area, subjected to generalized load. This system is solved by an exact procedure or by the application of a new numerical recurrence scheme relating the internal forces and displacements at the two end-points of an increase in its centroid-line. This solution has a transfer matrix structure. Both the stiffness matrix and the equivalent load vector are obtained arranging the transfer matrix. New structural matrices have been defined, which permit to determine directly the unknown values of internal forces and displacements at the two supported ends of the curved-beam element. Examples are included for verification.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001377708
|
oai_dc
|
Bending, buckling and vibration analyses of nonhomogeneous nanotubes using GDQ and nonlocal elasticity theory
|
Bending, buckling and vibration analyses of nonhomogeneous nanotubes using GDQ and nonlocal elasticity theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.C. Pradhan(Indian Institute of Technology); J.K. Phadikar(Indian Institute of Technology)"
] |
In this paper structural analysis of nonhomogeneous nanotubes has been carried out using nonlocal elasticity theory. Governing differential equations of nonhomogeneous nanotubes are derived. Nanotubes include both single wall nanotube (SWNT) and double wall nanotube (DWNT). Nonlocal theory of elasticity has been employed to include the scale effect of the nanotubes. Nonlocal parameter, elastic modulus, density and diameter of the cross section are assumed to be functions of spatial coordinates. General Differential Quadrature (GDQ) method has been employed to solve the governing differential equations of the nanotubes. Various boundary conditions have been applied to the nanotubes. Present results considering nonlocal theory are in good agreement with the results available in the
literature. Effect of variation of various geometrical and material parameters on the structural response of the nonhomogeneous nanotubes has been investigated. Present results of the nonhomogeneous nanotubes
are useful in the design of the nanotubes.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001377755
|
oai_dc
|
Damage detection in jacket type offshore platforms using modal strain energy
|
Damage detection in jacket type offshore platforms using modal strain energy
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"B. Asgarian(K.N. Toosi University of Technology); M. Amiri(K.N. Toosi University of Technology); A. Ghafooripour(Islamic Azad University)"
] |
Structural damage detection, damage localization and severity estimation of jacket platforms, based on calculating modal strain energy is presented in this paper. In the structure, damage often causes a loss of stiffness in some elements, so modal parameters; mode shapes and natural frequencies, in the
damaged structure are different from the undamaged state. Geometrical location of damage is detected by computing modal strain energy change ratio (MSECR) for each structural element, which elements with higher MSECR are suspected to be damaged. For each suspected damaged element, by computing crossmodal strain energy (CMSE), damage severity as the stiffness reduction factor -that represented the ratios between the element stiffness changes to the undamaged element stiffness- is estimated. Numerical studies are demonstrated for a three dimensional, single bay, four stories frame of the existing jacket platform, based on the synthetic data that generated from finite element model. It is observed that this method can
be used for damage detection of this kind of structures.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001377691
|
oai_dc
|
Influence of exterior joint effect on the inter-story pounding interaction of structures
|
Influence of exterior joint effect on the inter-story pounding interaction of structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Maria J. Favvata(Democritus University of Thrace); Chris G. Karayannis(Democritus University of Thrace); Asterios A. Liolios(Democritus University of Thrace)"
] |
The seismic induced interaction between multistory structures with unequal story heights (inter-story pounding) is studied taking into account the local response of the exterior beam-column joints. Although several parameters that influence the structural pounding have been studied sofar, the role of the joints local inelastic behaviour has not been yet investigated in the literature as key parameter for the pounding problem. Moreover, the influence of the infill panels as an additional parameter for the local damage effect of the joints on the inter-story pounding phenomenon is examined. Thirty six interaction
cases between a multistory frame structure and an adjacent shorter and stiffer structure are studied for two different seismic excitations. The results are focused: (a) on the local response of the critical external column of the multistory structure that suffers the hit from the slab of the adjacent shorter structure, and (b) on the local response of the exterior beam-column joints of the multistory structure. Results of this investigation demonstrate that the possible local inelastic response of the exterior joints may be in some cases beneficial for the seismic behaviour of the critical column that suffers the impact. However, in all the examined cases the developing demands for deformation of the exterior joints are substantially increased and severe damages can be observed due to the pounding effect. The presence of the masonry infill panels has also been proved as an important parameter for the response of the exterior beam-column joints and thus for the safety of the building. Nevertheless, in all the examined inter-story pounding cases
the presence of the infills was not enough for the total amelioration of the excessive demands for shear and ductility of the column that suffers the impact.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001377695
|
oai_dc
|
Effect of spiral reinforcement on flexural-shear-torsional seismic behavior of reinforced concrete circular bridge columns
|
Effect of spiral reinforcement on flexural-shear-torsional seismic behavior of reinforced concrete circular bridge columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Abdeldjelil Belarbi(Missouri University of Science and Technology); Suriya Prakash(Missouri University of Science and Technology); Young-Min You(Missouri University of Science and Technology)"
] |
This paper investigates the behavior of reinforced concrete (RC) circular columns under combined loading including torsion. The main variables considered in this study are the ratio of torsional moment to bending moment (T/M) and the level of detailing for moderate and high seismicity (low and high transverse reinforcement/spiral ratio). This paper presents the results of tests on seven columns subjected to cyclic bending and shear, cyclic torsion, and various levels of combined cyclic bending, shear, and torsion. Columns under combined loading were tested at T/M ratios of 0.2 and 0.4. These columns were reinforced with two spiral reinforcement ratios of 0.73% and 1.32%. Similarly, the columns subjected to pure torsion were tested with two spiral reinforcement ratios of 0.73% and 1.32%. This study examined the significance of proper detailing, and spiral reinforcement ratio and its effect on the torsional resistance under combined loading. The test results demonstrate that both the flexural and torsional capacities are decreased due to the effect of combined loading. Furthermore, they show a significant change in the failure mode and deformation characteristics depending on the spiral reinforcement ratio. The increase in spiral reinforcement ratio also led to significant improvement in strength and ductility.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001377714
|
oai_dc
|
An improved pushover analysis procedure for multi-mode seismic performance evaluation of bridges : (1) Introduction to numerical model
|
An improved pushover analysis procedure for multi-mode seismic performance evaluation of bridges : (1) Introduction to numerical model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"곽효경(한국과학기술원); 신동규(한국과학기술원)"
] |
This paper introduces an improved modal pushover analysis (IMPA) which can effectively evaluate the seismic response of multi-span continuous bridge structures on the basis of modal pushover analysis (MPA). Differently from previous modal pushover analyses which cause the numerical unstability because of the occurrence of reversed relation between the pushover load and displacement, the proposed method eliminates this numerical instability and, in advance the coupling effects induced from the direct application of modal decomposition by introducing an identical stiffness ratio for each dynamic mode at the post-yielding stage together with an approximate elastic deformation. In addition to these two introductions, the use of an effective seismic load, calculated from the modal spatial force and applied as
the distributed load, makes it possible to predict the dynamic responses of all bridge structures through a simpler analysis procedure than those in conventional modal pushover analyses. Finally, in order to establish validity and applicability of the proposed method, correlation studies between a rigorous nonlinear time history analysis and the proposed method were conducted for multi-span continuous bridges.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001377700
|
oai_dc
|
An application of large displacement limit analysis to frame structures
|
An application of large displacement limit analysis to frame structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Noel Challamel(Universite Europeenne de Bretagne 20)"
] |
The aim of this paper is to give a rigorous framework for the interpretation of limit analysis results including large displacements. The presentation is oriented towards unidimensional media (beams) but two-dimensional (plates) or three-dimensional media are also concerned. A single-degree-of-freedom
system is first considered: it shows the basic phenomena of large displacement limit analysis or secondorder limit analysis. The results are compared to those of a continuous system and the differences between both systems are discussed. Theoretical results are obtained using the kinematical approach of limit analysis. An admissible load-displacement plane is then defined, according to the yield design theory. The methodology used is applied to frame structures. The presented results are nevertheless
different from those already published in the literature, as the virtual displacement field can be distinguished from the displacement field at collapse. The simplicity of large displacement limit analysis makes it attractive for practical engineering applications. The load-displacement upper bound can be used for instance in the optimal design of steel frames in seismic areas.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001377705
|
oai_dc
|
Simulation of earthquake records using combination of wavelet analysis and non-stationary Kanai-Tajimi model
|
Simulation of earthquake records using combination of wavelet analysis and non-stationary Kanai-Tajimi model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"G. Ghodrati Amiri(Iran University of Science & Technology); A. Bagheri(Iran University of Science & Technology)"
] |
This paper is aimed at combining wavelet multiresolution analysis and nonstationary Kanai-Tajimi model for the simulation of earthquake accelerograms. The proposed approach decomposes earthquake accelerograms using wavelet multiresolution analysis for the simulation of earthquake accelerograms. This study is on the basis of some Iranian earthquake records, namely Naghan 1977, Tabas 1978, Manjil 1990 and Bam 2003. The obtained results indicate that the simulated records preserve the
significant properties of the actual accelerograms. In order to investigate the efficiency of the model, the spectral response curves obtained from the simulated accelerograms have been compared with those from
the actual records. The results revealed that there is a good agreement between the response spectra of simulated and actual records.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001377721
|
oai_dc
|
An improved pushover analysis procedure for multi-mode seismic performance evaluation of bridges: (2) Correlation study for verification
|
An improved pushover analysis procedure for multi-mode seismic performance evaluation of bridges: (2) Correlation study for verification
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"곽효경(한국과학기술원); 신동규(한국과학기술원)"
] |
In the companion paper, a simple but effective analysis procedure termed an Improved Modal Pushover Analysis (IMPA) is proposed to estimate the seismic capacities of multi-span continuous bridge structures on the basis of the modal pushover analysis, which considers all the dynamic modes of a structure. In contrast to previous studies, the IMPA maintains the simplicity of the capacity-demand curve method and gives a better estimation of the maximum dynamic response in a bridge structure. Nevertheless, to verify its applicability, additional parametric studies for multi-span continuous bridges
with large differences in the length of adjacent piers are required. This paper, accordingly, concentrates on a parametric study to review the efficiency and limitation in the application of IMPA to bridge structures through a correlation study between various analytical models including the equivalent single-degree-offreedom method (ESDOF) and modal pushover analysis (MPA) that are usually used in the seismic design of bridge structures. Based on the obtained numerical results, this paper offers practical guidance and/or limitations when using IMPA to predict the seismic response of a bridge effectively.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001377762
|
oai_dc
|
Passive vibration control of plan-asymmetric buildings using tuned liquid column gas dampers
|
Passive vibration control of plan-asymmetric buildings using tuned liquid column gas dampers
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Chuan Fu(Vienna University of Technology)"
] |
The sealed, tuned liquid column gas damper (TLCGD) with gas-spring effect extends the frequency range of application up to about 5 Hz and efficiently increases the modal structural damping. In this paper the influence of several TLCGDs to reduce coupled translational and rotational vibrations of
plan-asymmetric buildings under wind or seismic loads is investigated. The locations of the modal centers of velocity of rigidly assumed floors are crucial to select the design and the optimal position of the liquid absorbers. TLCGD’s dynamics can be derived in detail using the extended non-stationary Bernoulli’s equation for moving reference systems. Modal tuning of the TLCGD renders the optimal parameters by means of a geometrical transformation and in analogy to the classical tuned mass damper (TMD). Subsequently, fine-tuning is conveniently performed in the state space domain. Numerical simulations illustrate a significant reduction of the vibrations of plan-asymmetric buildings by the proposed TLCGDs.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001377735
|
oai_dc
|
Seismic behavior factors of buckling-restrained braced frames
|
Seismic behavior factors of buckling-restrained braced frames
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김진구(성균관대학교); 박준희(한국원자력연구원); 김상대(고려대학교)"
] |
The seismic behavior of a framed structure with chevron-type buckling restrained braces was investigated and their behavior factors, such as overstrength, ductility, and response modification factors, were evaluated. Two types of structures, building frame systems and dual systems, with 4, 8, 12, and 16 stories were designed per the IBC 2003, the AISC LRFD and the AISC Seismic Provisions. Nonlinear static pushover analyses using two different loading patterns and incremental dynamic analysis using 20 earthquake records were carried out to compute behavior factors. Time history analyses were also conducted with another 20 earthquakes to obtain dynamic responses. According to the analysis results, the response modification factors turned out to be larger than what is proposed in the provision in low-rise structures, and a little smaller than the code-values in the medium-rise structures. The dual systems, even though designed with smaller seismic load, showed superior static and dynamic performances.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001377767
|
oai_dc
|
Behavior of reinforced concrete corbels
|
Behavior of reinforced concrete corbels
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wen-Yao Lu(China University of Technology); Ing-Jaung Lin(National Taiwan University of Science and Technology)"
] |
Test results of thirteen reinforced concrete corbels with shear span-to-depth ratio greater than unity are reported. The main variables studied were compressive strength of concrete, shear span-todepth ratio and parameter of vertical stirrups. The test results indicate that the shear strengths of corbels
increase with an increase in compressive strength of concrete and parameter of vertical stirrups. The shear strengths of corbels also increase with a decrease in shear span-to-depth ratio. The smaller the shear span-to-depth ratio of corbel, the larger the stiffness and the shear strength of corbel are. The higher the concrete strength of corbel, the higher the stiffness and the shear strength of corbel are. The larger the parameter of vertical stirrups, the larger the stiffness and the shear strength of corbel are. The softened strut-and-tie model for determining the shear strengths of reinforced concrete corbels is modified appropriately in this paper. The shear strengths predicted by the proposed model and the approach of ACI Code are compared with available test results. The comparison shows that the proposed model can predict more accurately the shear strengths of reinforced concrete corbels than the approach of ACI Code.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001349165
|
oai_dc
|
On the nonlinear structural analysis of wind turbine blades using reduced degree-of-freedom models
|
On the nonlinear structural analysis of wind turbine blades using reduced degree-of-freedom models
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K. Holm-Jørgensen(Aalborg University); J.W. Stærdahl(Aalborg University); S.R.K. Nielsen(Aalborg University)"
] |
Wind turbine blades are increasing in magnitude without a proportional increase of stiffness for which reason geometrical and inertial nonlinearities become increasingly important. Often these effects are analysed using a nonlinear truncated expansion in undamped fixed base mode shapes of a blade, modelling geometrical and inertial nonlinear couplings in the fundamental flap and edge direction. The purpose of this article is to examine the applicability of such a reduced-degree-of-freedom model in
predicting the nonlinear response and stability of a blade by comparison to a full model based on a nonlinear co-rotating FE formulation. By use of the reduced-degree-of-freedom model it is shown that under strong resonance excitation of the fundamental flap or edge modes, significant energy is transferred to higher modes due to parametric or nonlinear coupling terms, which influence the response and stability conditions. It is demonstrated that the response predicted by such models in some cases becomes instable
or chaotic. However, as a consequence of the energy flow the stability is increased and the tendency of chaotic vibrations is reduced as the number of modes are increased. The FE model representing the case of infinitely many included modes, is shown to predict stable and ordered response for all considered parameters. Further, the analysis shows that the reduced-degree-of-freedom model of relatively low order overestimates the response near resonance peaks, which is a consequence of the small number of included
modes. The qualitative erratic response and stability prediction of the reduced order models take place at frequencies slightly above normal operation. However, for normal operation of the wind turbine without resonance excitation 4 modes in the reduced-degree-of-freedom model perform acceptable.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001349156
|
oai_dc
|
Free vibrations of anisotropic rectangular plates with holes and attached masses
|
Free vibrations of anisotropic rectangular plates with holes and attached masses
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"C. A. Rossit(Instituto de Mecanica Aplicada); P. M. Ciancio(Universidad Nacional del Centro de la Provincia de Buenos Aires)"
] |
Anisotropic materials are increasingly required in modern technological applications. Certainly, civil, mechanical and naval engineers frequently deal with the situation of analyzing the dynamical behaviour of structural elements being composed of such materials. For example, panels of anisotropic materials must sometimes support electromechanical engines, and besides, holes are performed in them for operational reasons e.g., conduits, ducts or electrical connections. This study is concerned with the natural frequencies and normal modes of vibration of rectangular anisotropic plates supported by different combinations of the classical boundary conditions: clamped, simply . supported and free, and with additional complexities such holes of free boundaries and attached concentrated masses. A variational approach (the well known Ritz method) is used, where the displacement amplitude is approximated by a set of beam functions in each coordinate direction corresponding to the sides of the rectangular plate.
Consequently each coordinate function satisfies the essential boundary conditions at the outer edge of the plate. The influence of the position and magnitude of both hole and mass, on the natural frequencies and modal shapes of vibration are studied for a generic anisotropic material. The classical Ritz method with beam functions as spatial approximation proved to be a suitable procedure to solve a problem of such analytical complexity.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001349163
|
oai_dc
|
Soil interaction effects on the performance of compliant liquid column damper for seismic vibration control of short period structures
|
Soil interaction effects on the performance of compliant liquid column damper for seismic vibration control of short period structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ratan Kumar Ghosh(Bengal Engineering & Science University); Aparna (Dey) Ghosh(Bengal Engineering & Science University)"
] |
The paper presents a study on the effects of soil-structure-interaction (SSI) on the performance of the compliant liquid column damper (CLCD) for the seismic vibration control of short period structures. The frequency-domain formulation for the input-output relation of a flexible-base structure with CLCD has been derived. The superstructure has been modeled as a linear, single degreeof-freedom (SDOF) system. The foundation has been considered to be attached to the underlying soil medium through linear springs and viscous dashpots, the properties of which have been represented by complex valued impedance functions. By using a standard equivalent linearization technique, the nonlinear orifice damping of the CLCD has been replaced by equivalent linear viscous damping. A numerical stochastic study has been carried out to study the functioning of the CLCD for varying degrees of SSI. Comparison of the damper performance when it is tuned to the fixed-base structural frequency and when tuned to the flexible-base structural frequency has been made. The effects of SSI on the optimal value of the orifice damping coefficient of the damper has also been studied. A more convenient approach for designing the damper while considering SSI, by using an established model of a replacement oscillator for the structure-soil system has also been presented. Finally, a simulation study, using a recorded accelerogram, has been carried out on the CLCD performance for the flexible-base structure.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001349158
|
oai_dc
|
The effects of construction practices on the seismic performance of RC frames with masonry infills
|
The effects of construction practices on the seismic performance of RC frames with masonry infills
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Nikos D. Lagaros(National Technical University of Athens); Martha A. Geraki(University of Thessaly)"
] |
A number of construction practices, implemented during the design process of a reinforced concrete (RC) structural system, may have significant consequences on the behaviour of the structural system in the case of earthquake loading. Although a number of provisions are imposed by the contemporary Greek national design codes for the seismic design of RC structures, in order to reduce the consequences, the influence of the construction practices on the seismic behaviour of the structural system remains significant. The objective of this work is to perform a comparative study in order to examine the influence of three, often encountered, construction practices namely weak ground storey, short and floating columns and two combinations on the seismic performance of the structural system with respect to the structural capacity and the maximum interstorey drifts in three earthquake hazard levels.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001349154
|
oai_dc
|
Dynamical behavior of generalized thermoelastic diffusion with two relaxation times in frequency domain
|
Dynamical behavior of generalized thermoelastic diffusion with two relaxation times in frequency domain
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Nidhi Sharma(N I T); Rajneesh Kumar(Kurukshetra University); Paras Ram(Department of Mathematics, N I T)"
] |
A general solution to the field equations of homogeneous isotropic generalized thermoelastic diffusion with two relaxation times (Green and Lindsay theory) has been obtained using the Fourier transform. Assuming the disturbances to be harmonically time.dependent, the transformed solution is obtained in the frequency domain. The application of a time harmonic concentrated and distributed loads have been considered to show the utility of the solution obtained. The transformed components of displacement, stress, temperature distribution and chemical potential distribution are inverted numerically, using a numerical inversion technique. Effect of diffusion on the resulting expressions have been depicted graphically for Green and Lindsay (G-L) and coupled (C-T) theories of thermoelasticity.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001349155
|
oai_dc
|
Shear deformation model for reinforced concrete columns
|
Shear deformation model for reinforced concrete columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Halil Sezen(The Ohio State University)"
] |
Column shear failures observed during recent earthquakes and experimental data indicate that shear deformations are typically associated with the amount of transverse reinforcement, column aspect ratio, axial load, and a few other parameters. It was shown that in some columns shear displacements can be significantly large, especially after flexural yielding. In this paper, a piecewise linear model is developed to predict an envelope of the cyclic shear response including the shear displacement and corresponding strength predictions at the first shear cracking, peak strength, onset of lateral strength degradation, and loss of axial-load-carrying capacity. Part of the proposed model is developed using the analysis results from the Modified Compression Field Theory (MCFT). The results from the proposed model, which uses simplified equations, are compared with the column test data.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001349151
|
oai_dc
|
Reliability considerations in bridge pier scouring
|
Reliability considerations in bridge pier scouring
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Muzzammil(Aligarh Muslim University); N. A. Siddiqui(Aligarh Muslim University); A.F. Siddiqui(Aligarh Muslim University)"
] |
The conventional design of bridge piers against scour uses scour equations which involve number of uncertain flow, sediments and structural parameters. The inherent high uncertainties in these parameters suggest that the reliability of piers must be assessed to ensure desirable safety of bridges against scour. In the present study, a procedure for the reliability assessment of bridge piers, installed in main and flood channels, against scour has been presented. To study the influence of various random variables on piers? reliability sensitivity analysis has been carried out. To incorporate the reliability in the evaluation of safety factor, a simplified relationship between safety factor and reliability index has been proposed. Effects of clear water (flood channel) and live bed scour (main channel) are highlighted on pier reliability. In addition to these, an attempt has also been made to explain the failure of Black mount bridge of New Zealand based on its pier?s reliability analysis. Some parametric studies have also been included to obtain the results of practical interest.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001416052
|
oai_dc
|
Preliminary static analysis of self-anchored suspension bridges
|
Preliminary static analysis of self-anchored suspension bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tan Yong-Gang(Dalian University of Technology); Zhang Zhe(Dalian University of Technology); Yu Yang(Dalian University of Technology); Zhao Xu(Dalian University of Technology)"
] |
토목공학
| null |
kci_detailed_000079.xml
|
||||
ART001416037
|
oai_dc
|
Investigating the negative tension stiffening effect of reinforced concrete
|
Investigating the negative tension stiffening effect of reinforced concrete
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Carlos Zanuy(Universidad Politecnica de Madrid)"
] |
The behaviour of a reinforced concrete tension member is governed by the contribution of concrete between cracks, tension stiffening effect. Under highly repeated loading, this contribution is progressively reduced and the member response approximates that given by the fully cracked member. When focusing on the unloaded state, experiments show deformations larger than those of the naked reinforcement. This has been referred to as negative tension stiffening and is due to the fact that concrete carries compressive stresses along the crack spacing, even thought the tie is subjected to an external tensile force. In this paper a cycle-dependent approach is presented to reproduce the behaviour of the axially loaded tension member, paying attention to the negative tension stiffening contribution. The interaction of cyclic bond degradation and time-dependent effects of concrete is investigated. Finally, some practical diagrams are given to account for the negative tension stiffening effect in reinforced concrete elements.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001416044
|
oai_dc
|
Vibration analysis of rotating Timoshenko beams by means of the differential quadrature method
|
Vibration analysis of rotating Timoshenko beams by means of the differential quadrature method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"D.V. Bambill(Universidad Nacional del Sur); D.H. Felix(Universidad Nacional del Sur); R.E. Rossi(Universidad Nacional del Sur)"
] |
Vibration analysis of rotating beams is a topic of constant interest in mechanical engineering. The differential quadrature method (DQM) is used to obtain the natural frequencies of free transverse vibration of rotating beams. As it is known the DQM offers an accurate and useful method for solution of differential equations. And it is an effective technique for solving this kind of problems as it is shown comparing the obtained results with those available in the open literature and with those obtained by an independent solution using the finite element method. The beam model is based on the Timoshenko beam theory.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001416049
|
oai_dc
|
Evaluation on structural behaviors of prestressed composite beams using external prestressing member
|
Evaluation on structural behaviors of prestressed composite beams using external prestressing member
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김상효(연세대학교); 안진희(연세대학교 ); 정치영(연세대학교)"
] |
In this study, experimental, numerical, and analytical approaches were carried out to evaluate the behavior and prestressing effect of prestressed composite beam by external tendon and cover plate. Behavior of prestressed composite beam, load-carrying capacity, effects of prestressing, and ultimate strength were estimated. The contribution of the section increase of the prestressing method using tendon was less than the prestressing method using cover plate. In accordance with numerical and analytical approaches, the ultimate strength of the prestressed composite beam is shown to be the same value because strength is determined according to the plastic resistance moment and the plastic neutral axis; however, both plastic resistance moment and neutral axis are not affected by prestressing force but affected by sectional stiffness of the prestressing member. Based on these approaches, we concluded that the prestressing method using tendon can be useful in applications without an increase in self-weight, and the prestressing method using high-strength cover plate can be applied to reduce the deflection of the composite beam. The prestressing method using high-strength cover plate can also be used to induce prestress of the composite beam in the case of a large deflection due to a smaller sectional stiffness of the composite beam.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001416051
|
oai_dc
|
Experimental and numerical studies of trench friction pendulum system
|
Experimental and numerical studies of trench friction pendulum system
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"C.S. Tsai(Feng Chia University); Wen-Shin Chen(Feng Chia University); Tsu-Cheng Chiang(Earthquake Proof Systems)"
] |
토목공학
| null |
kci_detailed_000079.xml
|
||||
ART001416040
|
oai_dc
|
Evaluation of static response in stress-ribbon concrete pedestrian bridges
|
Evaluation of static response in stress-ribbon concrete pedestrian bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Leonidas T. Stavridis(National Technical University of Athens)"
] |
An analytical method is proposed for the evaluation of the static response of a prestressedribbon concrete pedestrian bridge, which may also be applied for the roofing of large areas. On the basis of an established analogy with a suspension bridge system, a procedure is presented for the prestressedribbon direct analysis, leading to the introduction of two dimensionless parameters as governing factors of the design, namely the thinness and the prestressing steel ratio. The exposed procedure, applied by a simple computer program, allows a quick evaluation of the response and permits the investigation of the influence of the aforementioned parameters on it, by means of comprehensive diagrams. The presented diagrams may be directly used for the preliminary design of a pedestrian bridge of this type, for the whole practical range of span lengths. A design example is also included, showing the applicability of the proposed procedure.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001416027
|
oai_dc
|
Stress concentrations around a circular hole in an infinite plate of arbitrary thickness
|
Stress concentrations around a circular hole in an infinite plate of arbitrary thickness
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Longchao Dai(Nanjing University of Aeronautics and Astronautics); Xinwei Wang(Nanjing University of Aeronautics and Astronautics); Feng Liu(Civil Aviation Flight University of China)"
] |
This paper presents theoretical solutions for the three-dimensional (3D) stress field in an infinite isotropic elastic plate containing a through-the-thickness circular hole subjected to far-field inplane loads by using Kane and Mindlin’s assumption. The dangerous position, where the premature fracture or failure of the plate will take place, the expressions of the tangential stress at the surface of the hole and the out-of-plane stress constraint factor are found in a concise, explicit form. Based on the present theoretical solutions, a comprehensive analysis is performed on the deviated degree of the in-plane stresses from the related plane stress solutions, stress concentration and out-of-plane constraint, and the emphasis has been placed on the effects of the plate thickness, Poisson’s ratio and the far-field in-plane loads on the stress field. The analytical solution shows that the effects of the plate thickness and Poisson’s ratio on the deviation of the 3D in-plane stress components is obvious and could not be ignored, although their effects on distributions of the in-plane stress components are slight, and that the effect of the farfield in-plane loads is just on the contrary of that of the above two. When only the shear stress is loaded at far field, the stress concentration factor reach its peak value about 8.9% higher than that of the plane stress solutions, and the out-of-plane stress constraint factor can reach 1 at the surface of the hole and is the biggest among all cases considered.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001416034
|
oai_dc
|
Postbuckling response and failure of symmetric laminated plates with rectangular cutouts under in-plane shear
|
Postbuckling response and failure of symmetric laminated plates with rectangular cutouts under in-plane shear
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.B. Singh(Birla Institute of Technology and Science); Dinesh Kumar(Birla Institute of Technology and Science)"
] |
This paper deals with the buckling and postbuckling responses, and the progressive failure of square laminates of symmetric lay-up with a central rectangular cutout under in-plane shear load. A detailed investigation is made to show the effects of cutout size and cutout aspect ratio on the buckling and postbuckling responses, failure loads and failure characteristics of (+45/-45/0/90)2s, (+45/-45)4s and (0/90)4s laminates. The 3-D Tsai-Hill criterion is used to predict the failure of a lamina while the onset of delamination is predicted by the interlaminar failure criterion. In addition, the effects of boundary conditions on buckling loads, failure loads, failure modes, and maximum transverse deflection for a (+45/-45/0/90)2s laminate with and without a square cutout have been presented. It is concluded that because of early onset of delamination at the net section of cutouts before first-ply failure, total strength of the laminate with very small cutouts can not be utilized.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001416030
|
oai_dc
|
Using FEM and artificial networks to predict on elastic buckling load of perforated rectangular plates under linearly varying in-plane normal load
|
Using FEM and artificial networks to predict on elastic buckling load of perforated rectangular plates under linearly varying in-plane normal load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Aydin Komur(Aksaray University); Mustafa Sonmez(Aksaray University)"
] |
Elastic buckling load of perforated steel plates is typically predicted using the finite element or conjugate load/displacement methods. In this paper an artificial neural network (ANN)-based formula is presented for the prediction of the elastic buckling load of rectangular plates having a circular cutout. By using this formula, the elastic buckling load of perforated plates can be calculated easily without setting up an ANN platform. In this study, the center of a circular cutout was chosen at different locations along the longitudinal x-axis of plates subjected to linearly varying loading. The results of the finite element method (FEM) produced by the commercial software package ANSYS are used to train and test the network. The accuracy of the proposed formula based on the trained ANN model is evaluated by comparing with the results of different researchers. The results show that the presented ANN-based formula is practical in predicting the elastic buckling load of perforated plates without the need of an ANN platform.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001416024
|
oai_dc
|
Exact solution for in-plane displacement of redundant curved beam
|
Exact solution for in-plane displacement of redundant curved beam
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lili Zhu(Dalian Jiaotong University); Yinghua Zhao(Dalian Maritime University); Guangxin Wang(Dalian Jiaotong University)"
] |
토목공학
| null |
kci_detailed_000079.xml
|
||||
ART001414476
|
oai_dc
|
Intelligent fuzzy weighted input estimation method for the input force on the plate structure
|
Intelligent fuzzy weighted input estimation method for the input force on the plate structure
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ming-Hui Lee(Republic of China Military Academy); Tsung-Chien Chen(National Defense University)"
] |
The innovative intelligent fuzzy weighted input estimation method which efficiently and robustly estimates the unknown time-varying input force in on-line is presented in this paper. The algorithm includes the Kalman Filter (KF) and the recursive least square estimator (RLSE), which is weighted by the fuzzy weighting factor proposed based on the fuzzy logic inference system. To directly synthesize the Kalman filter with the estimator, this work presents an efficient robust forgetting zone, which is capable of providing a reasonable compromise between the tracking capability and the flexibility against noises. The capability of this inverse method are demonstrated in the input force estimation cases of the plate structure system. The proposed algorithm is further compared by alternating bwtween the constant and adaptive weighting factors. The results show that this method has the properties of faster convergence in the initial response, better target tracking capability, and more effective noise and measurement bias reduction.
|
토목공학
| null |
kci_detailed_000079.xml
|
|||
ART001416022
|
oai_dc
|
Buckling mosaic of a circular plate on a partial elastic foundation
|
Buckling mosaic of a circular plate on a partial elastic foundation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"C.Y. Wang(Michigan State University); L.H. Yu(National Chung Cheng University)"
] |
토목공학
| null |
kci_detailed_000080.xml
|
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