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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 17, Issue 6 - Nov 2013
Volume 17, Issue 5 - Sep 2013
Volume 17, Issue 4 - Jul 2013
Volume 17, Issue 3 - May 2013
Volume 17, Issue 2 - Mar 2013
Volume 17, Issue 1 - Jan 2013
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Seismic Performance Evaluation of Existing Low-rise RC Frames with Non-seismic Detail
Kim, Kyung Min ; Lee, Sang Ho ; Oh, Sang Hoon ;
Journal of the Earthquake Engineering Society of Korea, volume 17, issue 3, 2013, Pages 97~105
DOI : 10.5000/EESK.2013.17.3.97
In this paper, the a static experiment of on two reinforced concrete (RC) frame sub-assemblages was conducted to evaluate the seismic behaviors of existing RC frames that were not designed to support a seismic load. The specimens were a one span and actual-sized. One of them had two columns with the same stiffness, but the other had two columns with different stiffness values. As Regarding the test results, lots of many cracks occurred on the surfaces of the columns and beam-column joints for the two specimens, but the cover concrete splitting hardly occurred was minimal until the test ends. In the case of the specimen with the same stiffness offor the two columns, the flexural collapse of the left-side column occurred. However, in the case of the specimen with different stiffness values for of the two columns, the beam-column joint finally collapsed, even though the shear strength of the joint was designed to be strong enough to support the lateral collapse load. The nonlinear Nonlinear static analysis of the two specimens was also conducted using the uniaxial spring model, and the analytical results successfully simulated the nonlinear behaviour of the specimens in accordance with the test results.
Development of Hollow Reinforced Concrete Bridge Column Sections with Reinforcement Details for Material Quantity Reduction
Kim, Tae-Hoon ; Lee, Jae-Hoon ; Shin, Hyun-Mock ;
Journal of the Earthquake Engineering Society of Korea, volume 17, issue 3, 2013, Pages 107~115
DOI : 10.5000/EESK.2013.17.3.107
The purpose of this study was to investigate the performance of hollow reinforced concrete bridge column sections with reinforcement details for material quantity reduction. The proposed reinforcement details has have economic feasibility and rationality and makes construction periods shorter. A model of column sections with reinforcement details for material quantity reduction was tested under quasistatic monotonic loading. As a result, the proposed reinforcement details for material quantity reduction was were equal to existing reinforcement details in terms of the required performance. In the a subsequent paper, the an experimental and analytical study will be performed for the performance assessment of hollow reinforced concrete bridge column sections with reinforcement details for material quantity reduction will be performed.
Prediction of Long Term Performance and Creep of Laminated Natural Rubber Bearings(NRB)
Hwang, Kee Tae ; Seo, Dae Won ; Cho, Sung Gook ;
Journal of the Earthquake Engineering Society of Korea, volume 17, issue 3, 2013, Pages 117~125
DOI : 10.5000/EESK.2013.17.3.117
Seismic isolation has been considered and utilized in various industries as a way to prevent huge damage on to structures by large earthquakes in various industries. The laminated Laminated rubber bearings is are most frequently used in seismic isolation systems. The structural Structural safety could not be assured unless the performance of the rubber bearing is not guaranteed for the life time of the structure under the consideration that the bearing is a critical structural member to sustain vertical loads in the seismically isolated structure. However, there are few studies on the deterioration problems of rubber bearings during their service life. The long term performance of the rubber bearings was not considered in past designs of seismically isolated structures. This study evaluates the long term performance and creep characteristics of laminated natural rubber bearings that are used in seismically isolated buildings. For the this study, a set of accelerated thermal aging tests and creep tests are were performed on real specimens. The experimental results show that the natural rubber bearings would have a stable change rate of change for durability under severe environmental conditions for a long time.
Seismic Capacity of Reinforced Concrete Frames Retrofitted with H-beam Frame
Kim, Min Sook ; Choi, Hosoon ; Song, Seung Eon ; Lee, Young Hak ;
Journal of the Earthquake Engineering Society of Korea, volume 17, issue 3, 2013, Pages 127~132
DOI : 10.5000/EESK.2013.17.3.127
This study proposed proposes a retrofitting method using an H-beam frame to improve the seismic performance of non-seismic designed reinforced concrete frames. To evaluate the seismic performance with the H-beam frames, a cyclic lateral load test was performed and the experimental result was compared with the bared frame, and a masonry infilled RC frame. The results was were analyzed regarding aspects of the load-displacement hysteresis behavior, effective stiffness, displacement ductility, and cumulative energy dissipation. AlsoIn addition, it was possible to prove both an increase of in the maximum load capacity, effective stiffness, and energy dissipation capacity using the H-beam frame.
Fragility Assessment of Damaged Piloti-Type RC Building With/Without BRB Under Successive Earthquakes
Shin, Jiuk ; Kim, JunHee ; Lee, Kihak ;
Journal of the Earthquake Engineering Society of Korea, volume 17, issue 3, 2013, Pages 133~141
DOI : 10.5000/EESK.2013.17.3.133
This paper presents the seismic evaluation and prediction of a damaged piloti-type Reinforced Concrete (RC) building before and after post-retrofitting under successive earthquakes. For considering realistic successive earthquakes, the past records measured at the same station were combined. In this study, the damaged RC building due to the first earthquake was retrofitted with a buckling-restrained brace (BRB) before the second earthquake occurred. Nonlinear Time History Analysis (NTHA) was performed under the scaled intensity of the successive ground motions. Based on the extensive structural response data obtained form from the NTHA, the fragility relationships between the ground shaking intensity and the probability of reaching a pre-determined limit state was were derived. In addition, The the fragility curves of the pre-damaged building without and with the BRBs were employed to evaluate the effect of the successive earthquakes and the post-retrofit effect. Through the seismic assessment subjected to the successive records, it was observed that the seismic performance of the pre-damaged building was significantly affected by the severity of the damage from the first earthquake damages and the hysteresis behavior of the retrofit element.
Seismic Performance Assessment of a Nonlinear Structure Controlled by Magneto-Rheological Damper Using Multi-Platform Analysis
Kim, Sung Jig ;
Journal of the Earthquake Engineering Society of Korea, volume 17, issue 3, 2013, Pages 143~150
DOI : 10.5000/EESK.2013.17.3.143
The paper introduces Multi-Platform Analysis (MPA) for the seismic performance of a structure controlled by Magneto-Rheological (MR) dampers and presents analytical assessment of the effect of MR damper when taking into account nonlinear behavior of the structure. This paper introduces the MR Damper Plugin that can facilitate communication between MATLAB/Simulink and a finite element analysis tool in order to account for more complex inelastic behavior of the structure with MR dampers. The MPA method using the developed MR Damper Plugin is validated with experimental results from the real-time hybrid simulation. By utilizing the proposed MPA method, the three-story RC structure controlled by MR dampers is more realistically modeled and its performance under seismic loads is investigated. It is concluded that MR damper designed for a linear structure is not effective in a nonlinear structure and can overestimate the effect of MR damper. This work is expected to overcome difficulties in the analytical assessment of structural control strategies for complex and nonlinear structures by obtaining more reliable results.