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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 10, Issue 6 - Dec 2006
Volume 10, Issue 5 - Oct 2006
Volume 10, Issue 4 - Aug 2006
Volume 10, Issue 3 - Jun 2006
Volume 10, Issue 2 - Apr 2006
Volume 10, Issue 1 - Feb 2006
Selecting the target year
Reliability Analysis of Concrete Filled Carbon Composite Tube
Kim, Hee-Cheul ; Lee, Kyoung-Hun ; Hong, Won-Kee ; Lee, Young-Hak ; Eom, Chul-Hwan ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 5, 2006, Pages 1~9
DOI : 10.5000/EESK.2006.10.5.001
In this study, axial and lateral loading experiments for both circular and square plain concrete columns confined with carbon fiber tube manufactured by carbon filament winding technique were performed. Based on the test results, reliability analyses to estimate strength reduction factors were carried out by utilizing Monte Carlo technique. CASE I was for plain concrete columns confined with the carbon tubes, CASE II was for reinforced concrete columns confined with the carbon tubes. As results, the strength reduction factors,
, were estimated as 0.7 for CASE I and 0.85 for CASE II respectively.
Seismic Response of Multiple Span Prestressed Concrete Girder Bridges in the New Madrid Seismic Zone
Choi, Eun-Soo ; Kim, Hak-Soo ; Kim, Kwang-Il ; Cho, Byung-Wan ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 5, 2006, Pages 11~23
DOI : 10.5000/EESK.2006.10.5.011
This paper evaluates the seismic response of multi-span prestressed concrete girder bridges typically found in the New Madrid Seismic Zone region of the central United States. Using detailed nonlinear analytical models and synthetic ground motion records for Memphis, TN, nonlinear response history analyses are performed for two levels of ground motion: 10% probability of exceedance (PE) in 50 years, and 2% probability of exceedance (PE) in 50 years. The results show that the bridge performance is very good fur the 10% PE in 50 years ground motion level. However, the performance for the 2% PE in 50 years ground motion is not so good because it results in highly inelastic behavior of the bridge. Impact between decks results in large ductility demands on the columns, and failure of the bearings that support the girders. It is found that making the superstructure continuous, which is commonly performed for reducing dead load moments and maintenance requirements, results in significant improvement in the seismic response of prestressed concrete girder bridges.
Strength of Reinforced Concrete Beam-Column Assembles Subjected to Seismic Loading
Lee, Jung-Yoon ; Chai, Hyee-Dai ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 5, 2006, Pages 25~33
DOI : 10.5000/EESK.2006.10.5.025
This paper provides a method to predict the ductile capacity of reinforced concrete beam-column joints that fail in shear after the plastic hinges occur at both ends of the adjacent beams. After the plastic hinges occur at both ends of the beams, the longitudinal axial strain at the center of the beam section in the plastic hinge region abruptly increases because the neutral axis continues to move upward toward the extreme compressive fiber and the residual strain of the longitudinal bars continues to increase with each cycle of inelastic loading. An increase in the axial strain of the beam section after flexural yielding widens the cracks in the beam-column joints, thus leading to an decrease of the shear strength of the beam-column joints. The proposed method takes into account shear strength deterioration in the beam-column joints. In order to verify the shear strength and the corresponding ductility of the proposed method, test results of 52 RC beam-column assembles were compared. Comparisons between the observed and calculated shear strengths and their corresponding ductilities of the tested assembles, showed reasonable agreement.
An Efficient High-Frequency Vibration Analysis of Floors in Building Structures
Lee, Dong-Guen ; Kim, Tae-Ho ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 5, 2006, Pages 35~48
DOI : 10.5000/EESK.2006.10.5.035
The object of this study is to propose the efficient method for analyzing the building floors subjected to the loading with high frequency contents. For this purpose, the method for mesh division and the selection of master DOF for FE model of building floors with these loadings are studied. Also, it is verified that the availability of thin plate element that is used by structural engineers for the modelling of the building floor of which the span-thickness ratio is usually ten times and over. And the possibility and limit of the equivalent plate which is already studied by other researcher for the multi-layer plate are investigated. At last, proposed modelling method is examined by the example structure.
An Efficient Analytical Model for Floor Vibrations in Residential Buildings with Damping layer
Lee, Dong-Guen ; Kim, Tae-Ho ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 5, 2006, Pages 49~61
DOI : 10.5000/EESK.2006.10.5.049
The floor impact sound insulations are installed frequently for reducing the floor impact sound into the floor slab of the residential buildings in recent years. Therefore the analytical FE model considering the insulation is needed for the sound and vibration analysis of the floor and it is necessary to use a refined finite element model fer considering the large number of modes involved dynamic responses. So it is very difficult to use FE model because of the tiresome task for constructing the FE model, taking a lot of times for analysis and the impossibility of using the proportional damping. The efficient analysis and modeling method are proposed to the dynamic analysis for the floor with damping layer in this study. The floor slabs and finished layers are modeled individually and the spring elements that mean damping layers used to connect two parts. The dynamic analysis by the
method is performed to solve the non-proportional damping problem due to the damping coefficient of insulations.
Nonlinear Response Spectra of Artificial Earthquake Waves Compatible with Design Spectrum
Jun, Dae-Han ; Kang, Pyeong-Doo ; Kim, Jae-Ung ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 5, 2006, Pages 63~71
DOI : 10.5000/EESK.2006.10.5.063
In seismic response analysis of building structures, the input ground accelerations have considerable effect on the nonlinear response characteristics of structures. The characteristics of soil and the locality of the site where those ground motions were recorded affect on the contents of earthquake waves. Therefore, it is difficult to select appropriate input ground motions for seismic response analysis. This study describes a generation of artificial earthquake wave compatible with seismic design spectrum, and also evaluates the nonlinear response spectra by the simulated earthquake motions. The artificial earthquake wave are generated according to the previously recorded earthquake waves in past earthquake events. The artificial wave have identical phase angles to the recorded earthquake wave, and their overall response spectra are compatible with seismic design spectrum with 5% critical viscous damping. Each simulated earthquake wave has a identical phase angles to the original recorded ground acceleration, and match to design spectra in the range of period from 0.02 to 10.0 seconds. The seismic response analysis is performed to examine the nonlinear response characteristics of SDOF system subjected to the simulated earthquake waves. It was concluded that the artificial earthquake waves simulated in this paper are applicable as input ground motions for a seismic response analysis of building structures.
Seismic Performance Assessment of RC Pier Walls under Cyclic Out-of-plane Loading
Kim, Tae-Hoon ; Kim, Young-Jin ; Shin, Hyun-Mock ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 5, 2006, Pages 73~83
DOI : 10.5000/EESK.2006.10.5.073
The purpose of this study is to investigate the seismic behavior of reinforced concrete pier walls under cyclic out-of-plane loading and to develop improved seismic design criteria. The accuracy and objectivity of the assessment process can be enhanced by using a sophisticated nonlinear finite element analysis program. A computer program, named RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), for the analysis of reinforced concrete structures was used. A 4-node flat shell element with drilling rotational stiffness is used for spatial discretization. The layered approach is used to discretize the behavior of concrete and reinforcement through the thickness. Material nonlinearity is taken into account by comprising tensile, compressive and shear models of cracked concrete and a model of reinforcing steel. The method is verified a useful tool to assess the seismic performance of reinforced concrete pier walls subjected to cyclic out-of-plane load through comparing with reliable experimental results.
Flexural Overstrength of Reinforced Concrete Bridge Columns for Capacity Design
Lee, Jae-Hoon ; Ko, Seong-Hyun ; Choi, Jin-Ho ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 5, 2006, Pages 85~97
DOI : 10.5000/EESK.2006.10.5.085
Capacity design is to guarantee ductile failure of whole bridge system by preventing brittle failure of columns and any other structural elements until the columns develope fully enough plastic deformation capacity. This concept has been explicitly regulated in most bridge design specifications of foreign countries except the current Korea Bridge Design Specifications. In the capacity design, the transformed shear force from flexural overstrength of reinforced concrete column is used as the design lateral shear force for shear design of columns and design of footings and piles. Different calculating methods are adopted by the design specifications, since the variability of material strength and construction circumstances of the local regions should be considered. This paper proposed material overstrength factors by investigating 3,407 reinforcing bar data and 5,405 concrete compressive strength data collected in Korean construction sites. It also proposed calculating procedures for flexural overstrength of reinforced concrete columns using the material overstrength. Finally, overstrength factor was proposed as 1.5 by investigating 1,500 column section data from moment-curvature analysis using the material overstrength.
Implicit Time Integration Scheme for Real-Time Hybrid Test System
Jung, Rae-Young ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 5, 2006, Pages 99~106
DOI : 10.5000/EESK.2006.10.5.099
The Real-Time Hybrid Test system presented in this paper is based on the pseudodynamic test method, and it combines physical testing with model-based simulation. The system is designed to achieve a rate of loading that is significantly higher than that of a conventional pseudodynamic test approaching the real-time response of a structure subjected to earthquake loads. To provide robust computation environment for the analysis of many degree-of-freedom structures, the system adopts an implicit time integration scheme in the model-based simulation. This paper presents an overview of the developed system and numerical simulations that were conducted to evaluate the performance of the computation scheme adopted here. Results of these studies have demonstrated the good performance of the computation scheme for real-time multiple-degree-of-freedom tests.
Modal Identification and Seismic Performance Evaluation of 154kV Transformer Porcelain Bushing by Vibration Test
Joe, Yang-Hee ; Cho, Sung-Gook ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 5, 2006, Pages 107~115
DOI : 10.5000/EESK.2006.10.5.107
The power supply system is one of the most important infrafacilities which should maintain their inherent function during and after earthquakes. This study was performed to analyze dynamic characteristics and seismic performance of Korean typical 154kV transformer porcelain bushing. For the purpose of this study, actual 154kV porcelain bushings were selected and tested on the shaking table. The vibration tests consist of modal identification tests, seismic performance tests, and fragility tests. The sine sweep waves, artificial earthquake waves, and continuous resonant sine waves were used as shaking table motions. This paper describes the test specimens, shaking facilities, and test methods. Natural frequencies and damping ratios of the bushing have been evaluated from the experimental data. The failure mode and the performance level of the Korean transformer bushing have been first identified in this study.