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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 15, Issue 6 - Dec 2011
Volume 15, Issue 5 - Oct 2011
Volume 15, Issue 4 - Aug 2011
Volume 15, Issue 3 - Jun 2011
Volume 15, Issue 2 - Apr 2011
Volume 15, Issue 1 - Feb 2011
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Dynamic Interaction Analysis of Low, Medium and Super-high Speed Maglev and Guideways
Min, Dong-Ju ; Jung, Myung-Rag ; Lee, Jun-Seok ; Kim, Lee-Hyeon ; Kim, Moon-Young ;
Journal of the Earthquake Engineering Society of Korea, volume 15, issue 3, 2011, Pages 1~9
DOI : 10.5000/EESK.2011.15.3.001
The purpose of this study is to examine the dynamic characteristics of low, medium and high speed Maglev trains and guideways through dynamic interaction analysis. The coupled dynamic equations of motion for a vehicle of 10-dof and the associated guideway girders are developed by superposing vibration modes of the girder itself. The controller used in the UTM-01 Maglev vehicle is adopted to control the air gap between the bogie and guideway in this study. The effect of roughness, the guideway deflection-ratio and vehicle speed on the dynamic response of the maglev vehicle and guideway are then investigated using the 4th Runge-Kutta method. From the numerical simulation, it is found that the air gap increases with an increase of vehicle speed and the roughness condition. In particular, the dynamic magnification factor of the guideway girder is small at low and medium speeds, but the factor is noticeable at super-high speeds.
Evaluation of Inelastic Displacement Ratios for Smooth Hysteretic Behavior Systems
Song, Jong-Keol ;
Journal of the Earthquake Engineering Society of Korea, volume 15, issue 3, 2011, Pages 11~26
DOI : 10.5000/EESK.2011.15.3.011
The inelastic displacement ratio is defined as the ratio of the peak inelastic displacement to the peak linear elastic displacement. The inelastic displacement ratio allows simple evaluation of the peak inelastic displacement directly from the peak elastic displacement without computation of the inelastic response. Existing research of the inelastic displacement ratio is limited to piece-wise linear systems such as bilinear or stiffness degrading systems. In this paper, the inelastic displacement ratio is investigated for smooth hysteretic behavior systems subjected to near- and far-fault earthquakes. A simple formula of the inelastic displacement ratio is proposed by using a two step procedure of regression analysis.
3-D Dynamic Response of Buried Pipelines
Jeong, Jin-Ho ; Kim, Chun-Jin ;
Journal of the Earthquake Engineering Society of Korea, volume 15, issue 3, 2011, Pages 27~35
DOI : 10.5000/EESK.2011.15.3.027
Larbi (1995) and Jeong et al. (2005) analyzed the various boundary end conditions of buried pipelines using the mode superposition method as one of the dynamic analysis methods of buried pipelines. However, it is very complicated to derive calculation equations for the solutions to be obtained by this method, and even the derived calculation equations need separate computer programming for the numerical analysis in order to obtain the solutions. For this reason, this method is extremely difficult for engineers to apply in their field works. In consideration of the shortcoming of the mode superposition method, this study`s purpose is to propose a 3D dynamic finite difference method, which is more easily applicable in the field. For this purpose, we tested the accuracy of the 3D dynamic analysis and compared the results with those of the mode superposition method and certified that the 3D dynamic analysis could be an alternative method to obtain the seismic responses of the pipelines.
Seismic Performance and Damage Prediction of Existing Fire-protection Pipe Systems Installed in RC Frame Structures
Jung, Woo-Young ; Ju, Bu-Seog ;
Journal of the Earthquake Engineering Society of Korea, volume 15, issue 3, 2011, Pages 37~43
DOI : 10.5000/EESK.2011.15.3.037
Reliability of piping systems is essential to the safety of any important industrial facilities. During an earthquake, damage to the piping system can occur. It can also cause considerable economic losses and the loss of life following earthquakes. Traditionally, the study of the secondary system was less important than primary structure system, however it has recently been emerging as a key issue for the effective maintenance of the structural system and to help reduce nonstructural earthquake damage. The primary objectives of this study are to evaluate seismic design requirements and the seismic performance of gas and fire protection piping systems installed in reinforced concrete (RC) buildings. In order to characterize the seismic behavior of the existing piping system in an official building, 10 simulated earthquakes and 9 recorded real earthquakes were applied to ground level and the building system by the newmark average acceleration time history method. The results developed by this research can be used for the improvement of new seismic code/regulatory guidelines of secondary systems as well as the improvement of seismic retrofitting or the strengthening of the current piping system.
A Preliminary Study of the Seismic Damage Estimation for Harbor Sites
Choi, Seung-Ho ; Kim, Han-Saem ; Yoo, Seung-Hoon ; Chung, Chung-Ki ; Jang, In-Sung ;
Journal of the Earthquake Engineering Society of Korea, volume 15, issue 3, 2011, Pages 45~55
DOI : 10.5000/EESK.2011.15.3.045
In this study, the state of the art and characteristics of major Korean port structures were investigated and analyzed. Damage of port structures during earthquakes, evaluation systems of seismic damage and seismic designs have also been investigated. Based on the research, a methodology of seismic damage estimation was proposed considering geotechnical information and the characteristics of the fragility of port structures.
Seismic Performance Evaluation of Unreinforced Masonry Buildings By Using a Three-Step Procedure
Kim, Tae-Wan ; Min, Chan-Gi ; Lee, Hui-Man ;
Journal of the Earthquake Engineering Society of Korea, volume 15, issue 3, 2011, Pages 57~64
DOI : 10.5000/EESK.2011.15.3.057
In this study, a seismic performance evaluation of unreinforced masonry buildings was conducted based on a revised draft of the outline of the seismic performance evaluation of existing buildings. The procedure of the performance evaluation is composed of three-steps, which are a preliminary evaluation, a first-level detailed evaluation, and a second-level detailed evaluation, where evaluation is conservatively conducted in the beginning and then more detailed evaluations are gradually conducted. For the study, ten two-story unreinforced masonry buildings were selected and evaluated using the three-step evaluation. The result showed that the performance levels between the preliminary and the first-level detailed evaluations were reversed, which is different from the intent of the procedure. Therefore, in the near future, the problems in each evaluation step that are presented in the results of this study need to be refined.
Fragility Contour Method for the Seismic Performance Assessment of Generic Structures
Jeong, Seong-Hoon ; Lee, Ki-Hak ; Lee, Do-Hyung ;
Journal of the Earthquake Engineering Society of Korea, volume 15, issue 3, 2011, Pages 65~72
DOI : 10.5000/EESK.2011.15.3.065
Extensive computer simulations to account for the randomness in the process of seismic demand estimation have been a serious obstacle to the adoption of probabilistic performance assessments for the decision of applying seismic intervention schemes. In this study, a method for rapid fragility assessments based on a response database and the fragility contour method are presented. By the comparison of response contours in different formats, it is shown that representing maximum responses in ductility demand is better for the investigation of the effect of structural parameter changes on seismic demands than representations in absolute values. The presented fragility contour enables designers to practically investigate the probabilistic performance level of every possible retrofit option in a convenient manner using visualized data sets. This example demonstrates the extreme efficiency of the proposed approach in performing fragility assessments and successful application to the seismic retrofit strategies based on limit state probabilities.