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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Earthquake Engineering Society of Korea
Journal Basic Information
Journal DOI :
Earthquake Engineering Society of Korea
Editor in Chief :
Volume & Issues
Volume 5, Issue 6 - Dec 2001
Volume 5, Issue 5 - Oct 2001
Volume 5, Issue 4 - Aug 2001
Volume 5, Issue 3 - Jun 2001
Volume 5, Issue 2 - Apr 2001
Volume 5, Issue 1 - Feb 2001
Selecting the target year
A Study on the Applicability of Hybrid Mass Damper for the Vibration Control of the Structure under Base Excitation
Journal of the Earthquake Engineering Society of Korea, volume 5, issue 4, 2001, Pages 1~8
In this paper, a hybrid mass damper using AC-servomotor was designed and developed in order to reduce vibration levels of a 5-story test structure under base excitation. Control performances of the HMD under random and earthquakes excitations are compared with those of TMD through experimental test. It is confirmed that the HMD is more effective to reduce the vibration levels of the test structure especially for the earthquake excitation which excites more than 2 vibration modes of the structure simultaneously.
Seismic Behavior Evaluation of Unreinforced Masonry Structure Considering Soil-Structure Interaction
Journal of the Earthquake Engineering Society of Korea, volume 5, issue 4, 2001, Pages 9~16
The purpose of this study is to evaluate a seismic behavior of unreinforced masonry(URM) structure. For more efficient evaluation, quasi-dynamic analysis method is used in this study. The influence of soil-structure interaction on the seismic response of low rise structures is discussed through comparison of the computed seismic response for the structure on rigid or dense soil and that on soft soil. The results of analytical study show that the story shear forces and the base shear forces could increase on soft soil. Furthermore, it was observed that an approximate expressions prescribed in current seismic codes may underestimate the value of the base shear force of low rise buildings on soft soil.
Stochastic Prediction of Strong Ground Motions in Southern Korea
Journal of the Earthquake Engineering Society of Korea, volume 5, issue 4, 2001, Pages 17~26
In order to estimate peak ground motions and frequency characteristics of strong ground motions in southern korea, we employed the stochastic simulation method with the moment magnitude(M
) and the hypocentral distance(R). We estimated same input parameters that account for specific properties of source and propagation processes, and applied them to the stochastic simulation method. The stress drop(
) of 100-bar was estimated considering results of research in ENA, China, and southern korea. The attenuation parameter x was calculated by analyzing 57 seismograms recorded from September 1996 to October 1997 and the estimation result of the attenuation parameter x is 0.00112+0.000224 R where R is hypocenter distance. We estimated strong ground motion relations using the stochastic simulation method with suitable input parameters(e.g.
, x, and so on). At last, we derived relations between hypocentral distances and ground motions(seismic attenuation equation) using results of the stochastic prediction.esults of the stochastic prediction.n.
Lumped Parameter Model of Transmitting Boundary for the Time Domain Analysis of Dam-Reservoir System
Journal of the Earthquake Engineering Society of Korea, volume 5, issue 4, 2001, Pages 27~38
A mechanical lumped parameter model is proposed for the dynamic modeling of a semi-infinite reservoir. A semi-analytic transmitting boundary is derived for a semi-infinite 2-D reservoir of constant depth. The characteristics of the solution are examined in both frequency and time domains. Mass, damping and spring coefficients of the mechanical model are obtained to preserve the major features of the solution such as eigenfrequencies and the shapes of Bessel functions that appear as kernels in the convolution integrals. The lumped parameter model in its final form consists of two masses, a spring and two dampers for each eigenfrequency. Application examples demonstrated that the new lumped parameter model could be used for the time domain analysis of dam-reservoir systems.
Evaluation of Damage Indices for RC Bridge Piers with Premature Termination of Main Reinforcement Using Inelastic FE Analysis
Journal of the Earthquake Engineering Society of Korea, volume 5, issue 4, 2001, Pages 39~49
In this paper, inelastic analysis procedures are presented for the seismic performance evaluation of RC bridge piers with premature termination of main reinforcement. The mechanical characteristic of cracked concrete and reinforcing bar in concrete has been modeled, considering the bond effect between reinforcing bars and concrete, the effect of aggregate interlocking at crack surface and the stiffness degradation after the crack. The smeared crack approach is incorporated. In boundary plane at which each member with different thickness is connected, local discontinuous deformation due to the abrupt change in their stiffness can be taken into account by introducing interface element. The increase of concrete strength due to the lateral confining reinforcement has been also taken into account to model the confined concrete. The proposed numerical method for seismic performance evaluation of RC bridge piers with premature termination of main reinforcement will be verified by comparison with reliable experimental results.
Dynamic Test of a Full Scale Model of Five-Story Stone Pagoda of Sang-Gye-Sa
Journal of the Earthquake Engineering Society of Korea, volume 5, issue 4, 2001, Pages 51~66
There occurred a moderate size earthquake of Magnitude 5 in Whagae-Myun, Hadong-GUn, Kyongsangnam-Do on July 4, 1936. It caused severe damage to the buildings and other structures in Sang-Gye-Sa, a Buddhist Temple. The top component of a five-story stone pagoda was tipped over and fell down to the ground during the earthquake. In order to have accurate and quantitative estimate of the peak acceleration level of that earthquake, a full-scale model was constructed through rigorous verification process. The complete model was mounted on a shaking table and subjected to the dynamic tests. Two kinds of tests were performed: exploratory test and fragility test. The exploratory test was done with low acceleration level. In the fragility test, the behavior of the model was carefully monitored while increasing the acceleration level. The construction details of the model are provided and test procedures are reported. Finally important test results are presented and their implications are discussed.
Dynamic Characteristics and Isolation Performance of Isolation Table System
Journal of the Earthquake Engineering Society of Korea, volume 5, issue 4, 2001, Pages 67~74
Structural engineers lately have an interest in the safety for equipments and facility in buildings subjected to earthquake. The stability of cultural assets was not considered for the earthquake induced vibration, while the integrity of structure has been considered through the resistant earthquake design. The purpose of this study aimed to analyze the behavior of isolation device named as \"Isolation table system\" and to evaluate its isolation performance through the experiment study. Isolation table is one of isolation systems to reduce the vibration which was transferred from slab to exhibition table. Experimental result shows that isolation table can reduce the vibration by 80-90% and its behavior is very stable within its maximal stroke.al stroke.
Active Control of Earthquake Responses Using Fuzzy Supervisory Control Technique
Journal of the Earthquake Engineering Society of Korea, volume 5, issue 4, 2001, Pages 75~81
Fuzzy supervisory control method is studied for the active control of earthquake excited structures. The proposed algorithm supervises and tunes previously designed control gains by evaluating the state of a structure through the fuzzy inference mechanism, which uses the information of relative displacements and velocities. Example designs and numerical simulations of earthquake exited three degrees of freedom structures are performed to prove the validity of the proposed control algorithm. Comparative results with conventional LQR method show that the proposed method is effective for the vibration suppression of earthquake excited structures.
Behavior of Solid Circular RC Piers without Seismic Detailing Subjected to Cyclic Lateral Load
Journal of the Earthquake Engineering Society of Korea, volume 5, issue 4, 2001, Pages 83~95
Scale model tests were performed to investigate the seismic behavior and capacity of reinforced concrete piers that were not detailed for seismic load. The prototype pier is of solid circular section. Additional lateral reinforcing bars were not provided that might be required for the confinement. Two kinds of reinforcement details are considered for the vertical longitudinal reinforcing bars: lap spliced and continuous. In the case of lap spliced model all the longitudinal bars were lap spliced at the same height in the bottom plastic hinge zone. Three specimens were constructed and subjected to quasi-static cyclic lateral loading while the vertical load held constant. Non-ductile failure modes were observed in the test of lap spliced models but limited ductile behavior was observed in the test of a continuous longitudinal reinforcement model.
Analytical Modeling of Seismic Isolators at Cold Temperature Considering Strain Rate Effects
Journal of the Earthquake Engineering Society of Korea, volume 5, issue 4, 2001, Pages 97~105
Rubber bearings may exhibit a significant cold temperature effect and some velocity dependency(strain rate effect). Both of these attributes which affect non-linear behavior must be accounted for when accurately modeling the bearings behavior, therefore, an analytical models is proposed to consider the effects of the cold temperature and strain rate on both rubber and lead. From the results of an experimental investigation where the frozen bearings were tested under lateral cyclic loading with constant axial load, a non-linear system identification with least squares procedure was applied to determine the material properties of rubber and lead. It is demonstrated that the proposed analytical model is able to simulate the reversed cyclic loading behavior of elastometric and lead-rubber bearings.