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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
Editor in Chief :
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
Selecting the target year
The optimum damping retrofit for cabinet structures of NPP by μ-GA
Lee, Gye-Hee ; Ha, Dong-Ho ;
Journal of the Earthquake Engineering Society of Korea, volume 9, issue 1, 2005, Pages 1~7
DOI : 10.5000/EESK.2005.9.1.001
The optimal seismic retrofitting of NPP(Nuclear Power Plant) cabinet structures that contain seismic category 1 relays was studied in this paper. During earthquake event, the failure modes of relays are not appeared in form of structural failure, but are appeared in form of contact chatter of relay. Therefore, the retrofitting of cabinet has to be aimed at the reducing of the structural response, such as acceleration. In this study, the optimal characteristic values of dampers were searched by
-GA (micro-Genetic Algorithm) scheme for several installation patterns. To keep accuracy and efficiency of analysis, the structural models of cabinet were considered as a frame structure. The responses of structure were obtained inform of acceleration response spectra derived from the results of nonlinear time history analysis including damping nonlinearity. The objective function of the optimum procedure was constructed based on the maximum ratio of maximum spectral value and target GERS (General Equipment Ruggedness Spectra). The results show the good improvements of fitness for adequate retrofitting pattern. Especially, the improvements of fitness were remarkable when the values of damping exponents are low.
ATC-55 Based Friction Damper Design Procedure for Controlling Inelastic Seismic Responses
Kim, Hyoung-Seop ; Min, Kyung-Won ; Lee, Sang-Hyun ; Park, Ji-Hun ;
Journal of the Earthquake Engineering Society of Korea, volume 9, issue 1, 2005, Pages 9~16
DOI : 10.5000/EESK.2005.9.1.009
The purpose of this paper is to present a design procedure of a friction damper for controlling elastic and inelastic responses of building structures under earthquake excitation. The equivalent damping and period increased by the friction damper are estimated using ATC-40 and ATC-55 procedures which provide equivalent linear system for bilinear one, and then a design formula to achieve target performance response level by the friction damper is presented. It is identified that there exists error between the responses obtained by this formula and by performing nonlinear analysis and the features of the error vary according to the hardening ratio, yield strength ratio, and structural period. Equations for compensating the error are proposed based on the least square method, and the results from numerical analysis indicate that the error is significantly reduced. The proposed formula can be used without much error for designing a friction damper for retrofitting a structure showing elastic or inelastic behavior.
Experimental Behavior of Reinforced Concrete Column-Bent Piers under Bidirectional Repeated Loading
Park, Chang-Kyu ; Lee, Beom-Gi ; Song, Hee-Won ; Chung, Young-Soo ;
Journal of the Earthquake Engineering Society of Korea, volume 9, issue 1, 2005, Pages 17~24
DOI : 10.5000/EESK.2005.9.1.017
Response of reinforced concrete (RC) column-bent piers subjected to bidirectional seismic loadings was experimentally investigated. RC column-bent piers represent one of the most popular shapes of piers used in Korea highway bridges. Four column-bent piers were constructed in 400 mm diameter and 2,000 mm height. Each pier has two circular supporting columns. These piers were tested under bidirectional lateral load reversals with an axial load of
. The test parameters included : different transverse reinforcement contents and lap-spliced longitudinal reinforcing steels. Test results indicate that the lap splice of longitudinal reinforcing steels have significantly influenced on hysteretic response of column-bent piers similar to previous test results for single columns with corresponding test parameters. Column capacity was changed with the level of transverse confinement. From the comparison of test result for single column under unidirectional loading, the damage of single column was concentrated on lower plastic hinge region but the damage of column-bent piers was scattered to upper and lower plastic hinge region.
Estimation of the First Modal Participation Factor of a Shear Building under Earthquake Load
Hwang, Jae-Seung ; Kim, Hong-Jin ; Kang, Kyung-Soo ;
Journal of the Earthquake Engineering Society of Korea, volume 9, issue 1, 2005, Pages 25~32
DOI : 10.5000/EESK.2005.9.1.025
Seismic load is distributed to modes of a structure through the modal participation factor(MPF). The modal participation factor is essential to analyze structural response under earthquake load. MPF of a real structure differs from that of analytical mathematical model due to the error induced from analytical assumptions and during the construction. In this study, an identification method is proposed to calculate the 1st MPF of real structure based on
optimal model reduction. The MPF is obtained from the relationship between observability and controllability matrices realized from system identification and those of a prototype 2-degree state space model. The proposed method is verified thorough numerical examples.
Seismic Response Analysis and Performance Evaluation of Wind-Designed Concentrically Braced Steel Highrise Buildings under Moderate Seismicity
Lee, Cheol-Ho ; Kim, Seon-Woong ;
Journal of the Earthquake Engineering Society of Korea, volume 9, issue 1, 2005, Pages 33~42
DOI : 10.5000/EESK.2005.9.1.033
Even in moderate to low seismic regions like Korean peninsular where wind loading usually governs the structural design of a tall builidng, the probable structural impact of the 500-year design basis earthquake (DBE) or the 2400-year maximum credible earthquake (MCE) on the selected structural system should be considered at least in finalizing the design. In this study, seismic performance evaluation was conducted for concentrically braced steel highrise buildings that were only designed for wind by following the assumed domestic design practice. It was found that wind-designed concentrically braced steel highrise buildings possess significantly increased elastic seimsic capacity due to the system overstrength resulting from the wind-serviceability criterion and the width-to-thickness ratio limits on steel members. The strength demand-to-strength capacity study based on the response spectrum analysis revealed that, due to the system overstrength factors mentioned above, wind-designed concentrically braced steel highrise buildings having a slenderness ratio of larger than six can withstand elastically even the maximum credible earthquake at the performance level of immediate occupancy.
Pseudo-Dynamic Test for the Bridges Retrofitted with Laminated Rubber Bearings
Kwak, Im-Jong ; Cho, Chang-Beck ; Han, Kyoung-Bong ; Kim, Young-Jin ; Kwak, Jong-Won ;
Journal of the Earthquake Engineering Society of Korea, volume 9, issue 1, 2005, Pages 43~50
DOI : 10.5000/EESK.2005.9.1.043
Many highway bridges in Korea need seismic retrofit because only one decade has passed since the seismic design criteria was introduced. For the highway bridges of which bearings are worn and dysfunctional, the validity of seismic retrofit method using laminated rubber bearings was discussed in this study. Real scale RC pier specimens without seismic details were constructed. And then, Pot bearing, Rubber bearing (RB), Lead-rubber bearing (LRB) were applied to these specimens. Through pseudo dynamic test method, dynamic behavior of these RC piers under earthquake was simulated and compared. From the test results, proposed seismic retrofit method was found to be valid.
Smart Passive System Based on MR Damper
Cho, Sang-Won ; Jo, Ji-Seong ; Kim, Chun-Ho ; Lee, In-Won ;
Journal of the Earthquake Engineering Society of Korea, volume 9, issue 1, 2005, Pages 51~59
DOI : 10.5000/EESK.2005.9.1.051
Magnetorheological(MR) dampers are one of the most promising semi active control devices, because they have advantages such as small power requirement, reliability, and low price to manufacture. To reduce the responses of structures with MR dampers, a control system including power supply, controller, and sensors is required. However, when a mount of MR dampers are used to a large?scale civil structure such as cable stayed bridges, the control system becomes complex. Therefore, it is not easy to install and maintain the MR damper based control system. To resolve above difficulties, This paper proposes a smart passive system that consists of a MR damper and an electromagnetic induction(EMI) system. According to the Faraday’s law of induction, EMI system that is attached to the MR damper produces electric energy. The produced energy is supplied to the MR damper. Thus, the MR damper with EMI system does not require any power at all. Furthermore, the induced electric energy is proportional to external loads like earthquakes, which means the MR damper with EMI system is adaptable to external loads without any controller and corresponding sensors. Therefore, it is easy to build up and maintain the proposed smart passive system.
Fuzzy control of hybrid base-isolator with magnetorheological damper and friction pendulum system
Kim, Hyun-Su ; Roschke, P.N. ; Lin, P.Y. ;
Journal of the Earthquake Engineering Society of Korea, volume 9, issue 1, 2005, Pages 61~70
DOI : 10.5000/EESK.2005.9.1.061
Shaking table tests are carried out on a single-degree-of-freedom mass that is equipped with a hybrid base isolation system. The isolator consists of a set of four specially-designed friction pendulum systems (FPS) and a magnetorheological (MR) damper. The structure and its hybrid isolation system are subjected to various intensities of near- and far-fault earthquakes on a large shake table. The proposed fuzzy controller uses feedback from displacement or acceleration transducers attached to the structure to modulate resistance of the semi-active damper to motion. Results from several types of passive and semi-active control strategies are summarized and compared. The study shows that a combination of FPS isolators and an adjustable MR damper can effectively provide robust control of vibration for a large full-scale structure undergoing a wide variety of seismic loads.
Parameter Identification Using Static Compliance Dominant Frequencies
Nam, Dong-Ho ; Choi, Sang-Hyun ; Park, Soo-Yong ;
Journal of the Earthquake Engineering Society of Korea, volume 9, issue 1, 2005, Pages 71~78
DOI : 10.5000/EESK.2005.9.1.071
This paper presents an improved system identification methodology for structural systems by applying static compliance dominant (SCD) frequencies. The existing sensitivity-based system identification technique is extended to adopt the static compliance dominant frequencies, and the performance of the additional spectral information, i.e., SCD frequencies, is compared with that of the natural frequencies only via a numerical example of a mechanical system. The results of the numerical study indicate that the additional use of the SCD frequencies improves accuracy in system identification problems.