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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Earthquake Engineering Society of Korea
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Journal DOI :
Earthquake Engineering Society of Korea
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Volume & Issues
Volume 6, Issue 6 - Dec 2002
Volume 6, Issue 5 - Oct 2002
Volume 6, Issue 4 - Aug 2002
Volume 6, Issue 3 - Jun 2002
Volume 6, Issue 2 - Apr 2002
Volume 6, Issue 1 - Feb 2002
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Analysis on In-Plane Behavior of Unreinforced Masonry Walls
Journal of the Earthquake Engineering Society of Korea, volume 6, issue 3, 2002, Pages 1~10
DOI : 10.5000/EESK.2002.6.3.001
A series of unreinforced masonry(URM) walls were analytically investigated by FEM for a limited version of seismic in-plane performance. For this, URM walls were assumed to be continum and modeled as isotropic plane stress elements, within which the nature of cracking was propogated. Accordingly, behavioral mode of cracking in URM was modeled by smeared-crack approach. Total of 70 cases were considered for various parameters such as axial load ratio, aspect ratio and effective section area ratio due to the existence of opening, etc. The analysis results indicate that these parameters significantly and interactively influence over the ultimate strength of URM walls. Finally, it is suggested that the response modification factor for URM adopted in the current Korean Standard should be validated considering various forms of brittleness and probable failure modes in URM.
Evaluation of Ductility Capacity of Reinforced Concrete Bridge Columns Subject to Cyclic Loading Using Flexibility-Based Fiber Element Method
Journal of the Earthquake Engineering Society of Korea, volume 6, issue 3, 2002, Pages 11~21
DOI : 10.5000/EESK.2002.6.3.011
The evaluation of displacement ductility is performed by direct method through tracking the inelastic hysteretic behavior of RC bridge columns subject to cyclic loading using a flexibility-based fiber element mode. To reasonably track the inelastic behavior until the RC bridge column reaches its ultimate state, the average stress-average strain relations and joint elements, which agree well with experiments, are modified and applied considering the tension stiffening behavior and discontinuous displacement between the column and its base. In addition the evaluation of displacement ductility is performed by a direct method easily applicable to numerical analysis. Locations for the integration points, values for the post-crushing concrete strength and low-cycle fatigue failure of longitudinal reinforcement that affect the calculation of yielding and ultimate displacements are proposed for the application to flexibility-based fiber element model. Since less than 10% of error occurs during the displacement ductility analysis, the yielding and ultimate displacements evaluated by the applied analysis method and model appear to be valid.
Evaluation of an Effective Load Transfer System Applied to a Simple Model of a Wall Frame Structural System
Journal of the Earthquake Engineering Society of Korea, volume 6, issue 3, 2002, Pages 23~29
DOI : 10.5000/EESK.2002.6.3.023
A wall-frame type structural system has been widely used to make full use of a limited land in large cities to satisfy the several functional requirement in one building. However, this type of hybrid structure brought some problems due to the vertical discontinuity of a structural system. The response of a wall-frame type structural system having a deep transfer girder was observed. An arch system was introduced to replace the deep transfer girder. The adequacy of an arch system was observed for the various boundary conditions of a system. The proposed system was compared to a general transfer girder system by applying both gravity load and lateral load. It was observed that an arch system fairly distributes the stress without concentrating stress at a certain location of a system differently from the current transfer girder system. The moment decrement effect of a column can also be obtained by eliminating the large mass of a transfer girder. Also it was investigated that an arch system is more economical and effective than the current transfer girder system.
Evaluation of Seismic Damage for RC Bridge Piers I : Theory and Formulation
Journal of the Earthquake Engineering Society of Korea, volume 6, issue 3, 2002, Pages 31~40
DOI : 10.5000/EESK.2002.6.3.031
The purpose of this study is to investigate the seismic behavior of RC bridge piers and to provide the data for developing improved seismic design criteria. The accuracy and objectivity of the assessment process may be enhanced by the use of sophisticated nonlinear finite element analysis program. A computer program, named RCAHEST(reinforced concrete analysis in higher evaluation system technology), for the analysis of reinforced concrete structures was used. Material nonlinearity is taken into account by comprising tensile, compressive and shear models of cracked concrete and a model of reinforcing steel. The smeared crack approach is incorporated. n boundary plane at which each member with different thickness is connected, local discontinuity in deformation due to the abrupt change in their stiffness can be taken into account by introducing interface element. The effect of number of load reversals with the same displacement amplitude has been also taken into account to model the reinforcing steel and concrete. In the companion paper, the proposed numerical method for seismic damage evaluation of RC bridge piers is verified by comparison with the reliable experimental results.
Evaluation of Seismic Damage for RC Bridge Piers II : Numerical Analysis
Journal of the Earthquake Engineering Society of Korea, volume 6, issue 3, 2002, Pages 41~52
DOI : 10.5000/EESK.2002.6.3.041
In the companion paper, nonlinear finite element analysis procedures are presented for the seismic damage evaluation of RC bridge piers. This paper defines a damage index based on the predicted hysteretic behavior of a RC bridge pier. Damage indices aim to provide a means of quantifying numerically the damage in RC bridge piers sustained under earthquake loading. The proposed numerical method is applied to RC bridge piers tested by other, and compared to existing damage indices. The proposed numerical method gives a realistic prediction of damage throughout the loading cycles for several test specimens investigated.
Elastic Horizontal Response of a Structure to Bedrock Earthquake Considering the Nonlinearity of the Soil Layer
Kim, Yong-Seok ;
Journal of the Earthquake Engineering Society of Korea, volume 6, issue 3, 2002, Pages 53~62
DOI : 10.5000/EESK.2002.6.3.053
Site soil condition affects significantly on the seismic response of a structure and is a critical factor for the performance based seismic design of a structure. In this paper, the effects of nonlinear soil properties on the elastic response spectra of a structure including the nonlinearity of a soil due to the earthquake excitation is investigated using one step finite element approach for the entire soil structure system and approximate linear iterative procedure to simulate the nonlinear soil behavior with the Ramberg-Osgood soil model. Studies were carried out for a linear SDOF system of a variable period with and without a pile group for the 1940 CI Centro earthquake recorded on ground rather than rock. The study results showed clearly that the effect of the nonlinear behavior of soft soil is very important on the elastic seismic response of a structure suggesting the necessity of the performance based seismic design.
Derivation of Estimating Formulas for Seismic Strength of RC Frames Designed to Gravity Loads
Journal of the Earthquake Engineering Society of Korea, volume 6, issue 3, 2002, Pages 63~71
DOI : 10.5000/EESK.2002.6.3.063
The seismic design regulations have not been applied to the low-rised buildings which are less than 6 stories in Korea. For these buildings which are designed only for gravity loads, theoretical formulas which can estimate the seismic strength of building are derived. The column hinge sway and beam hinge sway mechanism are assumed for the formulars. For the comparisons with the formulas, the results of push-over analyses of 3 and 4 storied buildings are used. It can be shown that the estimating formulas correspond well with the push-over analyses. And the seismic strength of building has a little relations with the number of bay and becomes larger as the building becomes lower. Also, as the ratio and strength of reinforcing steel increase, the seismic strength of building is increased.
Computation of Hypothetical Tsunamis on the East Coast in Korea
Journal of the Earthquake Engineering Society of Korea, volume 6, issue 3, 2002, Pages 73~86
DOI : 10.5000/EESK.2002.6.3.073
Prognostic characteristics of hypothetical tsunamis in the East Sea are discussed based on numerical model simulations of linear long wave theory and wave ray for 28 source zones of tsunamigenic earthquake selected by the seismic gap theory. As a result, the propagation patterns of tsunamis due to hypothetical earthquake are presented and analyses also lead to selection of the geographical zones with low risk of tsunamis.
Seismic Retrofit of Asymmetric.Elasto-Plastic Structure Using Viscous Dampers
Journal of the Earthquake Engineering Society of Korea, volume 6, issue 3, 2002, Pages 87~93
DOI : 10.5000/EESK.2002.6.3.087
A procedure for figuring out proper amount of additional viscous damping required to keep the inelastic deformation of a plan-wise asymmetric structure within a given target performance point was developed. To this end the behavior of an asymmetric nonlinear structure after yielding is investigated. Then a formula for the required amount of equivalent damping was derived based on the ductility demand of the structure. The procedure was applied to a five-story asymmetric structure subjected to an earthquake load. According to the comparison with the results from the dynamic time-history analysis, the structure with viscous dampers installed in accordance with the proposed procedure showed satisfactory seismic performance in both the stiff and the flexible edges.