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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 14, Issue 6 - Dec 2010
Volume 14, Issue 5 - Oct 2010
Volume 14, Issue 4 - Aug 2010
Volume 14, Issue 3 - Jun 2010
Volume 14, Issue 2 - Apr 2010
Volume 14, Issue 1 - Feb 2010
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Seismic Responses Control of Coupled Shear Wall Structures Using LRBs
Park, Yong-Koo ; Kim, Hyun-Su ; Ko, Hyun ; Kim, Min-Gyun ; Lee, Dong-Guen ;
Journal of the Earthquake Engineering Society of Korea, volume 14, issue 6, 2010, Pages 1~9
DOI : 10.5000/EESK.2010.14.6.001
Most of shear wall structures require openings in shear walls and thus shear walls are linked by floor slabs or coupling beams resulting in the coupled shear wall structures. When these structures are subjected to seismic excitations, excessive shear forces are induced in coupling beams. Accordingly, brittle failure of coupling beams may occur or shear walls may yield first. To avoid this problem, damping devices can be installed in coupling beams. It can increase the vibration control effect and improve the seismic resistance performance of the coupled shear wall structure by avoiding stress concentration and the brittle failure of coupling beams. Based on this background research, an LRB (lead rubber bearing) was introduced in the middle of the coupling beam in this study and the authors investigated the seismic response control effect and stress distribution of the proposed system. To this end, a modeling technique that can effectively predict the structural behavior of coupled shear wall structures has been proposed. With this proposed technique, time history analyses of the example coupled shear wall structure subjected to seismic excitation were performed and the vibration control effects of the seismic responses were investigated.
Seismic Behavior of a Five-story RC Structure Retrofitted with Buckling-Restrained Braces Using Time-dependent Elements
Shin, Ji-Uk ; Lee, Ki-Hak ; Lee, Do-Hyung ; Jeong, Seong-Hoon ;
Journal of the Earthquake Engineering Society of Korea, volume 14, issue 6, 2010, Pages 11~21
DOI : 10.5000/EESK.2010.14.6.011
This study presents seismic responses of 5-story reinforced concrete structures retrofitted with the buckling-restrained braces using a time-dependent element. The time-dependent element having birth and death times can freely be activated within the user defined time intervals during the time history analysis. The buckling-restrained brace that showed the largest energy dissipation capacity among the test specimens in previous research was used for retrofitting the RC buildings in this study. It was assumed that the first story of the damaged building under the first earthquake was retrofitted with the buckling-restrained braces considered as the time-dependent element before the second of the successive earthquakes occurs. Under this assumption, this paper compares seismic responses of the RC structures with the time-dependent element subjected to the successive earthquake. Subjected to the second earthquake, it was observed that activation of the BRB systems largely decreases deformation of the moment frame where the damage was concentrated under the first earthquake. However, damages to the shear wall systems were increased after activation of the BRB systems. Since the cumulative damages of the shear wall systems were infinitesimal compared with the retrofit effect of the moment frame, the BRB system was effective under the successive earthquake.
Analytical Simulation of Reversed Cyclic Lateral Behaviors of R.C. Shear Wall Subassemblages Using PERFORM 3D
Lee, Han-Seon ; Jeong, Da-Hun ; Hwang, Kyung-Ran ; Park, Hong-Gun ;
Journal of the Earthquake Engineering Society of Korea, volume 14, issue 6, 2010, Pages 23~31
DOI : 10.5000/EESK.2010.14.6.023
It is necessary to develop reliable but simple analytical models to predict the nonlinear response of reinforced concrete wall structures. In this study, experimental results on the cyclic reversed lateral behaviors of reinforced concrete shear wall assemblages are simulated analytically by using the wall, beam, and column models available in the PERFORM 3D program. Through the comparison of experimental and analytical results, the reliability and limitations of the analysis are evaluated. In addition, the information, which could not be obtained experimentally, such as the internal flow of force, the contribution of the flange walls, and the resisting mechanism of the walls with the contribution of the coupling beam, is provided.
Verification of Hybrid Structural Test Technique by Shaking Table Test of a Linear 2-Dimensional Frame Model
Cho, Sung-Min ; Choi, In-Gyu ; Jung, Dae-Sung ; Kim, Chul-Young ;
Journal of the Earthquake Engineering Society of Korea, volume 14, issue 6, 2010, Pages 33~43
DOI : 10.5000/EESK.2010.14.6.033
This paper deals with the hybrid structural test technique which has been introduced and studied currently in Korea. In this study, a Mini-MOST system which was developed as a part of NEES research was modified and improved to reduce the total simulation time to half of the original system. Using the proposed system together with the 2 dimensional small steel frame specimen, the validity and efficiency of the hybrid test technique is investigated. Even though the hybrid test has been developed as an alternative to the shaking table test and has been studied and applied for a long time in several countries, no attempt has been made to compare it directly with the shaking table test. Therefore, in this study, the hybrid test results are compared with those of the shaking table test as well as with a numerical simulation for the verification of hybrid test. From the comparison and analysis of the test results, it is concluded that the hybrid test can simulate the actual seismic behavior of structural systems very accurately and it can be a good alternative to the shaking table test.
Seismic Performance of the Anchor System of Bearing-protection Devices Preventing the Unseating Failure of Bridges
Jeong, Hyeok-Chang ; Kim, Min-Su ; Park, Kwang-Soon ; Ju, Hyeong-Seok ; Kim, Ick-Hyun ;
Journal of the Earthquake Engineering Society of Korea, volume 14, issue 6, 2010, Pages 45~53
DOI : 10.5000/EESK.2010.14.6.043
The unseating failure of bridges, which is one of the most severe types of damage leading to the loss of transportation function, should be avoided in earthquakes. As a measure of prevention of unseating failure resulting from the failure of bearings, bearing-protection devices are frequently used. They are installed beside the bearings and protect the bearings by resisting a seismic load transmitted from the superstructure. In order to show appropriate seismic performance, the strength of anchors as well as of device bodies should be confirmed. In Korea, they have been installed only according to the design provided by device agents, because a proper design method for the anchors has not been established. In this study the performance of bearing-protection devices with various heights of concrete bed blocks has been investigated experimentally, and a proper design method has been proposed to secure seismic performance.
Static Experiment for the Seismic Performance of a 2 Story RC Shear Wall System
Lee, Sang-Ho ; Oh, Sang-Hoon ; Hwang, Won-Tae ; Lee, Kyung-Bo ; Lee, Han-Seon ;
Journal of the Earthquake Engineering Society of Korea, volume 14, issue 6, 2010, Pages 55~65
DOI : 10.5000/EESK.2010.14.6.055
The purpose of this experimental study is to evaluate the seismic performance of a 2 story RC shear wall system by the static reversal loading test. The lower 2 stories of the prototype structure were selected, and the specimens of this study were comprised of a T-type wall with an opening. The specimens were reduced to about 60% of the full scale size and were constructed to measure the result of the experimental variable regarding the existence of a lintel beam. To perform this study, the static repeated loading test was performed. According to the existence or absence of a lintel beam, the structural capacities and behavioral differences of the shear wall system were compared. The test results of this study showed that the specimen with a lintel beam underwent the seismic performance with an ultimate strength and ductility capacity better than the specimen without a lintel beam.
Verification of the Torsional Amplification Factor for the Seismic Design of Torsionally Imbalanced Buildings
Lee, Kwang-Ho ; Jeong, Seoung-Hoon ;
Journal of the Earthquake Engineering Society of Korea, volume 14, issue 6, 2010, Pages 67~74
DOI : 10.5000/EESK.2010.14.6.067
Because of the difference between the actual and computed eccentricity of buildings, symmetrical buildings will be affected by torsion. In provisions, accidental eccentricity is intended to cover the effect of several factors, such as unfavorable distributions of dead- and live-load masses and the rotational component of ground motion about a vertical axis. The torsional amplification factor is introduced to reduce the vulnerability of torsionally imbalanced buildings. The effect of the torsional amplification factor is observed for a symmetric rectangular building with various aspect ratios, where the seismic-force-resisting elements are positioned at a variable distance from the geometrical center in each direction. For verifying the torsional amplification factor in provisions, nonlinear reinforced concrete models with various eccentricities and aspect ratios are used in rock. The difference between the maximum displacements of the flexible edge obtained between using nonlinear static and time-history analysis is very small but the difference between the maximum torsional angles is large.
Seismic Performance Evaluation of Steel Moment Resisting Frame Systems According to an Improved Design Method of RBS-B Connections
Han, Sang-Whan ; Kang, Ki-Byung ; Moon, Ki-Hoon ; Hwang, Seong-Hoon ;
Journal of the Earthquake Engineering Society of Korea, volume 14, issue 6, 2010, Pages 75~84
DOI : 10.5000/EESK.2010.14.6.075
In current seismic design provisions, a reduced beam section with bolted web (RBS-B) connections is only permitted for intermediate moment frames (IMF). This study evaluated the seismic performance of steel moment resisting frame systems having RBS-B connections designed according to current seismic design provisions. For this purpose, 12 archetypal IMF systems having two different span lengths (9m, 6m) were designed considering two design load levels (SDC
). A nonlinear analytical model that can simulate hysteretic behavior of an RBS-B connection was also developed in this study. The procedures specified in ATC 63 are used to conduct a seismic performance evaluation. Moreover, this study conducts the seismic performance evaluation of IMF systems designed according to a new design method proposed by the authors in the previous study. It was observed that several model frames designed according to current seismic design provisions did not provide satisfactory collapse margin ratios (ACMR). This study also showed that the model frames designed according to the new design procedures had a sufficient ACMR.