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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 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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Parametric Study on the P-M Interaction Diagram of Hollow Prestressed Concrete Bridge Columns
Kim, Tae-Hoon ;
Journal of the Earthquake Engineering Society of Korea, volume 15, issue 6, 2011, Pages 1~10
DOI : 10.5000/EESK.2011.15.6.001
This study presents the results of parametric studies of the P-M interaction diagram of hollow prestressed concrete bridge columns. Among the numerous parameters, this study concentrates on concrete compressive strength, prestressing steel reinforcement ratio, effective prestress, the Ds/Do ratio, and the Di/Do ratio. The strength and ductility of hollow prestressed concrete bridge columns were evaluated through quasistatic tests. The P-M interaction diagrams from the codes were different from that of the results, which were in good agreement with AASHTO-LRFD. Nondimensionalized P-M interaction diagrams were developed to predict the design resistance of hollow prestressed concrete bridge columns.
Analysis of Experimental Modal Properties of an Electric Cabinet via a Forced Vibration Test Using a Shaker
Cho, Sung-Gook ; So, Gi-Hwan ;
Journal of the Earthquake Engineering Society of Korea, volume 15, issue 6, 2011, Pages 11~18
DOI : 10.5000/EESK.2011.15.6.011
Accurate modal identification analysis is required to reasonably perform a seismic qualification of safety-related electric equipment installed in nuclear power plants (NPPs). This study evaluates a variation of the modal properties of an electric equipment cabinet structure in NPPs according to the excitation levels. For the study, an actual electric equipment cabinet was selected as a specimen and was dynamically tested by using a portable exciter in accordance with the level of input vibration energy. Tests were classified into two sets: with-door cases, and without-door cases. Frequency response functions were computed from the signals of the acceleration responses and input motions measured from the vibration tests. A polynomial curve fitting algorithm was used to extract the modal properties from the frequency response functions. This study reviews the variation of the modal properties according to the variation of the excitation levels. The results of the study show that the modal frequencies and the modal dampings of the object specimen varies nonlinearly according to the excitation level of the test motion. Attaching the door increases the modal damping of the cabinet.
A Study on the Criteria for the Earthquake Safety Evaluation of Fill Dams
Choo, Yun-Wook ; Lee, Sei-Hyun ; Kim, Mu-Kwang ; Kim, Dong-Soo ;
Journal of the Earthquake Engineering Society of Korea, volume 15, issue 6, 2011, Pages 19~31
DOI : 10.5000/EESK.2011.15.6.019
The current Korean criteria for seismic performance evaluated by dynamic analysis regulates that the horizontal displacement and vertical settlement of a dam body, including the static deformation, should be within 1% of the dam height. However, there has been weak theoretical support, so that the current criteria have to be validated. Korea is in a region of low or moderate seismicity located inside the Eurasian plate, and few earthquakes with considerable magnitudes and intensities have been recorded in the area. Therefore, in this study, published data measured in overseas countries were collected in order to construct a database and validate the current criteria. In addition, dynamic centrifuge tests and a parametric study using numerical simulations were performed in order to investigate the effect on the horizontal displacement and settlement of a dam body and to validate the current criteria.
Comparative Evaluation of Formulas of Strength Reduction Factors for the Generation of an Inelastic Demand Spectrum
Cho, Sung-Gook ; Park, Woong-Ki ; Joe, Yang-Hee ;
Journal of the Earthquake Engineering Society of Korea, volume 15, issue 6, 2011, Pages 33~44
DOI : 10.5000/EESK.2011.15.6.033
The shape of an inelastic demand spectrum may have a major impact on the seismic evaluation results of a structure. The inelastic demand spectrum could be obtained by scaling down from the elastic response spectrum by applying the strength reduction factor (SRF). This study has investigated formulas for SRFs that were suggested by numerous previous studies. This paper compares their characteristics, including the shapes of the curves of the SRFs and the inelastic demand spectra that were produced by applying the various formulas for SRFs. The mean curve was computed from the SRF curves generated by the various formulas. This study derives a new formula for the SRF curve through regression analysis. From the comparative study, it is shown that the proposed formula for the SRF can generate the mean curve of the inelastic demand spectra which have been previously suggested by others.
Seismic Retrofit Design Procedure Using a Friction Damper
Moon, Ki-Hoon ; Han, Sang-Whan ; Jo, Han-Chul ; Lee, Kang-Seok ;
Journal of the Earthquake Engineering Society of Korea, volume 15, issue 6, 2011, Pages 45~53
DOI : 10.5000/EESK.2011.15.6.045
The purpose of this study was to propose a design procedure for a damped structure with a friction damper for an existing structure. The target displacement of the damped structure was determined using the maximum displacement of the existing structure. The displacement of the damped structures was predicted using a proposed equation for the inelastic displacement ratio. For this study, we conducted a nonlinear response history analysis using 80 earthquake ground motions to verify the validity of the proposed design procedure by comparing the responses of the damped and undamped structures. Based on the dynamic analysis results, it was concluded that the predicted displacement of the damped structure using the proposed design procedure matched well with the analysis results.
Design and Construction of a 1:5 Scale 10-Story R.C. Apartment Building Model for Earthquake Simulation Tests
Hwang, Seong-Jun ; Lee, Kyung-Bo ; Kang, Chang-Bum ; Lee, Han-Seon ; Lee, Sang-Ho ; Oh, Sang-Hoon ;
Journal of the Earthquake Engineering Society of Korea, volume 15, issue 6, 2011, Pages 55~66
DOI : 10.5000/EESK.2011.15.6.055
The purpose of this study was to develop an efficient process in the design and construction of a 1:5 scale 10-story R.C. apartment building model for an earthquake simulation test. The reduction ratio of the specimen was determined by the size (
) and pay load (600kN) of the available shaking table and the availability of model reinforcements. For efficiency and quality control of the reinforcement work, prefabrication was used. Construction was conducted in two steps, the wall in one step, and another step for the slab, because it was impossible to remove the formwork of a wall if the walls and slabs in a story were constructed in one step. The slip form construction method was used repetitively for walls. The formwork of a wall was made with veneer and acryl plate on each side, so it was possible to check the quality of the concrete placing. To construct this model, it took roughly six months with five full-time research assistants, for a total of 602 man days of labor in construction.
Earthquake Simulation Tests on a 1:5 Scale 10-Story R.C. Residential Building Model
Lee, Han-Seon ; Hwang, Seong-Jun ; Lee, Kyung-Bo ; Kang, Chang-Bum ; Lee, Sang-Ho ; Oh, Sang-Hoon ;
Journal of the Earthquake Engineering Society of Korea, volume 15, issue 6, 2011, Pages 67~80
DOI : 10.5000/EESK.2011.15.6.067
This paper presents the results of shaking table tests on a 1:5 scale 10-story R.C. wall-type residential building model. The following conclusions are drawn based on the test results. (1) The model responded linear elastically under the excitations simulating an earthquake with a return period of 50 years, and showed a nonlinear response under the excitations simulating the design earthquake of Korea. (2) The model showed a significant strength drop under the maximum considered earthquake, with a return period of 2400 years. (3) The major portion of the resistance to lateral inertia forces came from the walls used for the elevator and stair case. (4) Finally, the damage and failure modes appear to be due to the flexural behavior of walls and slabs. A significant deterioration of stiffness and an elongation of the fundamental periods were observed under increased earthquake excitations.
Seismic Performance Assessment of Reinforced Concrete Bridge Columns with Interlocking Circular Hoops
Kim, Tae-Hoon ; Park, Kwang-Soon ; Kang, Hyeong-Taek ;
Journal of the Earthquake Engineering Society of Korea, volume 15, issue 6, 2011, Pages 81~90
DOI : 10.5000/EESK.2011.15.6.081
The purpose of this study was to investigate the seismic performance of reinforced concrete bridge columns with interlocking circular hoops. Three interlocking columns were tested under a constant axial load and a quasistatic, cyclically reversed horizontal load. A computer program, RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology) was used for the analysis of reinforced concrete structures. The used numerical method gives a realistic prediction of performance throughout the loading cycles for several test specimens investigated. Based on the experimental and analytical results, design recommendations are presented to improve the existing practice in the design and construction of reinforced concrete bridge columns with interlocking circular hoops.