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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Earthquake Engineering Society of Korea
Journal Basic Information
Journal DOI :
Earthquake Engineering Society of Korea
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Volume & Issues
Volume 9, Issue 6 - Dec 2005
Volume 9, Issue 5 - Oct 2005
Volume 9, Issue 4 - Aug 2005
Volume 9, Issue 3 - Jun 2005
Volume 9, Issue 2 - Apr 2005
Volume 9, Issue 1 - Feb 2005
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Parametric Study on Dynamic Stability Behaviors of Beck's Column considering Shear Deformation and Damping Effects
Lee, Jun-Seok ; Kim, Nam-Il ; Kim, Moon-Young ;
Journal of the Earthquake Engineering Society of Korea, volume 9, issue 6, 2005, Pages 1~12
DOI : 10.5000/EESK.2005.9.6.001
For a shear-deformable beam-column element subjected io non-conservative forces, equations of motion and a finite element formulation are presented applying extended Hamilton's principle. The influence of non-conservative force's direction parameter, internal and external damping forces, and shear deformation and rotary inertia effects on divergence and flutter loads of Beck's columns are intensively investigated based on element stiffness, damping and mass matrixes derived for the non-conservative system.
Generation of Floor Response Spectra including Equipment-Structure Interaction in Frequency Domain
Choi, Dong-Ho ; Lee, Sang-Hoon ;
Journal of the Earthquake Engineering Society of Korea, volume 9, issue 6, 2005, Pages 13~19
DOI : 10.5000/EESK.2005.9.6.013
Floor response spectra for dynamic response of subsystem such as equipment, or piping in nuclear power plants are usually generated without considering dynamic interaction between main structure and subsystem. This study describes the analytic method in which equipment response spectra can be obtained through dynamic analysis considering equipment-structure Interaction(ESI). In this method, dynamic response of the equipment by this method is based on a dynamic substructure method in which the equipment-structure system is partitioned into the single-degree-ol-freedom system(SDOF) representing the equipment and the equipment support impedance representing the dynamic charactenstics of the structure ai the equipment support. A family of equipment response spectra is developed by applying this method to calculate the maximum responses of a family of SDOF equipment systems with wide banded equipment frequency, damping ratio, and mass. The method is validated by comparing the floor response spectrum from this method with the floor response spectrum generated from the rigorous analysis including equipments on the containment building of a prototypical nuclear power plant. in order to Investigate ESI effect in the response of equipment, response values from the method and the conventional approach without considering ESI are compared for the equipment having the mass less than 1% of the total structural mass. Response spectra from the method showed lower spectral amplitudes than those of the conventional floor response spectra around controlling frequencies.
Optimal Design of Friction Dampers based on the Story Shear Force Distribution of a Building Structure
Lee, Sang-Hyun ; Min, Kyung-Won ; Park, Ji-Hun ; Lee, Roo-Jee ;
Journal of the Earthquake Engineering Society of Korea, volume 9, issue 6, 2005, Pages 21~30
DOI : 10.5000/EESK.2005.9.6.021
In this study, a seismic design methodology for friction dampers based on the story shear force distribution of an elastic building structure is proposed. First, using two normalization methods for the slip-load of a friction damper, numerical analyses of various single-degree-of-freedom systems are peformed. From those analyses, the effect of the slip-load and the brace stiffness was investigated and the optimal silliness ratio of the brace versus original structure was found. Second, from the numerical analysis for five multi-story building structures with different natural frequency and the number of story, reasonable decision method for the total number of installation floor, location of installation and distribution of the slip-loads are drawn. In addition, an empirical equation on the optimal number of installation floor is proposed. Finally, the superiority of the proposed method compared to the existing design method is verified from the numerical analysis using real earthquake data.
Nonlinear Dynamic Behavior of a Cold-Formed Steel Shear Panel by Shaketable Tests
Kim, Tae-Wan ; Lee, Moon-Sung ;
Journal of the Earthquake Engineering Society of Korea, volume 9, issue 6, 2005, Pages 31~39
DOI : 10.5000/EESK.2005.9.6.031
The purpose of this study was to investigate the nonlinear behavior of a cold-formed steel (CFS) shear panel, which was composed of built-up columns and tension-only diagonal straps for bracing, when excited by earthquake motions. For the purpose, shaketable tests of a full-scale two-story cold-formed steel (CFS) shear panel were conducted. in the shear panel, the diagonal strap is a major lateral force resisting system, which is a very ductile member, and the columns, which are gravity resisting members, are fabricated by wooing studs, which can't develop their full flexural strength because they may buckle locally. The test results showed that the straps dissipate most of energy of the shear panel in a tension-only and pinched way and the columns dissipate it relatively smaller than the straps but they still contribute to overall dissipation. As a result of this study, investigating real nonlinear behavior of a structure in earthquakes is a very important process by shaketable tests even though it is simple.
A Study on the Seismic Damage Estimation in the Model District of Seoul City
Yoon, Eui-Taek ; Ryu, Hyeuk ; Kang, Tae-Seob ; Kim, Jae-Kwan ; Baag, Chang-Eob ;
Journal of the Earthquake Engineering Society of Korea, volume 9, issue 6, 2005, Pages 41~52
DOI : 10.5000/EESK.2005.9.6.041
The seismic damage assessment due io the postulated earthquake was attempted for the buildings in the model district of Seoul City. The model district was selected to represent the typical structural and residential characteristics of Seoul City. The buildings in the model district were classified into 11 structural types. For each structural type, the capacity and fragility curves were constructed with parameters presented in HAZUS. The ground motions due to the postulated earthquakes were artificially generated and ground response analyses were done for three kinds of soil profiles classified with respect to the depth of surface soil layer. The probability of damage state of each structural type was calculated using capacity spectrum method and fragility curve. Finally, the calculated results were translated into GIS database and mapped to evaluate the seismic damage in the model district.
Seismic Behaviors of a Bridge System in the Stochastic Perspectives
Mha, Ho-Seong ;
Journal of the Earthquake Engineering Society of Korea, volume 9, issue 6, 2005, Pages 53~58
DOI : 10.5000/EESK.2005.9.6.053
Semi-analytical methodology to examine the dynamic responses of a bridge is developed via the joint probability density function. The evolution of joint probability density function is evaluated by the semi-analytical procedure developed. The joint probability function of the bridge responses can be obtained by solving the path-integral solution of the Fokker-Planet equation corresponding to the stochastic differential equations of the system. The response characteristics are observed from the joint probability density function and the boundary of the envelope of the probability density function can provide the maxima ol the bridge responses.
Large Crack Model and Its Numerical Algorithm for Damage Analysis of Dynamically Loaded Structures
Lee, Jee-Ho ;
Journal of the Earthquake Engineering Society of Korea, volume 9, issue 6, 2005, Pages 59~65
DOI : 10.5000/EESK.2005.9.6.059
In this paper a constitutive model for large cracks in concrete and other brittle materials subject to dynamic and cyclic leading is presented. The suggested model is based on the plastic-damage model for cyclic leading. A numerical formulation based on the three-step return-mapping algorithm for the proposed large crack model is also present. The numerical examples show that the present algorithm works appropriately under dynamic leading and should be used in large crack problems to prevent excessive tensive plastic strain development causing unrealistic results.
Earthquake Response Analysis considering Irregular Soil Layers
Park, Jang-Ho ; Park, Jae-Gyun ;
Journal of the Earthquake Engineering Society of Korea, volume 9, issue 6, 2005, Pages 67~73
DOI : 10.5000/EESK.2005.9.6.067
Precise analysis of soil-structure interaction requires a proper description of soil profile. However, such approach becomes generally nearly unpractical for soil exhibiting material discontinuity and complex geometry since meshes should match that material discontinuity line. To overcome these difficulties, a different numerical integration method is adopted in this paper, which enables to integrate easily over an element with material discontinuity without regenerating mesh fellowing the discontinuity line. As a result the mesh is highly structured, loading to very regular silliness matrix. The influence of the shape of soil profile on the response is examined and it is seen that the proposed soil-structure analysis method can be easily used on soil-structure interaction problems with complicated soil profile and produce reliable results regardless of material discontinuities.
Fuzzy Control of Semi-Active Magneto-Rheological Dampers for Seismic Response Control of Cable-Stayed Bridge
Ok, Seung-Yong ; Kim, Dong-Seok ; Koh, Hyun-Moo ; Park, Kwan-Soon ;
Journal of the Earthquake Engineering Society of Korea, volume 9, issue 6, 2005, Pages 75~90
DOI : 10.5000/EESK.2005.9.6.075
This paper proposes semi-active fuzzy control technique of magneto-rheological dampers for seismic response control of cable-stayed bridges. Through the fuzzy inference process, the proposed technique performs the semi-active control with the responses of MR dampers only. Moreover, differently from the conventional semi-active control technique, this technique does not require additional active controller for the primary controller, which provides a simple design process. in order to validate the control performance of the proposed technique, the semi-active fuzzy control technique is applied to the benchmark control problem of cable-stayed bridge and its control performance is compared with those of conventional semi-active control techniques. The comparative results show that the proposed fuzzy control technique can be an effective control strategy by efficiently and simultaneously reducing the mutual conflicting responses such as the shear forces and moments at the base of the lowers, longitudinal displacement of the deck, and tensions in the stay cables.