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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 13, Issue 6 - Dec 2009
Volume 13, Issue 5 - Oct 2009
Volume 13, Issue 4 - Aug 2009
Volume 13, Issue 3 - Jun 2009
Volume 13, Issue 2 - Apr 2009
Volume 13, Issue 1 - Feb 2009
Selecting the target year
The Effect of the Shear Wave Velocity of a Seismic Control Point on Site Response Analysis
Lee, Jin-Sun ;
Journal of the Earthquake Engineering Society of Korea, volume 13, issue 1, 2009, Pages 1~8
DOI : 10.5000/EESK.2009.13.1.001
In order to evaluate the effect of shear wave velocity of a seismic control point on site response analysis, one-dimensional equivalent linear site response analysis were performed on the model soil profile based on the results of a detailed site investigation of sedimentary layers at Incheon and Busan. The results of the analysis show that an increase of shear wave velocity on the seismic control point (base rock) results in an increase of acceleration in the soil layers. This was mainly due to an unclear definition of the seismic control point. For this reason, the Korean Seismic Design Standard requires a specific definition of the seismic control point, including spatial conditions and soil properties, similar to the MCE (Maximum Considered Earthquake) in FEMA 369.
Experimental Study on Bond Strength of AFRP Rebar in Normal Strength Concrete
Choi, June-Ho ; Park, Kyung-Chan ; Lee, Young-Hak ; Kim, Hee-Cheul ; Lee, Jae-Sam ;
Journal of the Earthquake Engineering Society of Korea, volume 13, issue 1, 2009, Pages 9~16
DOI : 10.5000/EESK.2009.13.1.009
For reinforced concrete members, bond strength is one of the important factors between the two materials: the concrete and the reinforcing element. The bond strength of Aramid Fiber Reinforced Polymer (AFRP) rebar was tested using the pull-out method. Presented were comparison results of the bond strength between AFRP rebar and deformed steel bars from the test. Embedded lengths and diameters of the rebar were taken into account as parameters. The bond stress-slip responses and failure modes of AFRP rebar were evaluated. It was found that the bond stress-slip responses of AFRP rebar were similar to those of deformed steel bars. As the diameter of rebar increased, the pull-out load increased. In addition, it was shown that the bond strength of an AFRP rebar was approximately 54% compared with that of a deformed steel bar.
Evaluation of the Inelastic Seismic Response of Curved Bridges by Capacity Spectrum Method using Equivalent Damping
Joe, Yang-Hee ; Cho, Sung-Gook ; Ma, Jeong-Suck ;
Journal of the Earthquake Engineering Society of Korea, volume 13, issue 1, 2009, Pages 17~26
DOI : 10.5000/EESK.2009.13.1.017
The capacity spectrum method (CSM), which is known to be an approximate technique for assessing the seismic capacity of an existing structure, was originally proposed for simple building structures that could be modeled as single-degree-of-freedom (SDOF) systems. More recently, however, CSM has increasingly been adopted for assessing most bridge structures, as it has many practical advantages. Some studies on this topic are now being performed, and a few results of these have been presented as ground-breaking research. However, studies have until now been limited to symmetrical straight bridges only. This study evaluates the practical applicability of CSM to the evaluation of irregular curved bridges. For this purpose, the seismic capacities of 3-span prestressed concrete bridges with different subtended angles subjected to some recorded earthquakes are compared with a more refined approach based on nonlinear time history analysis. The results of the study show that when used for curved bridges, CSM induces higher inelastic displacement responses than the actual values, and that the gap between the two becomes larger as the subtended angle increases.
Analysis of Site Amplification of Seismic Stations using Odesan Earthquake
Kim, Jun-Kyoung ;
Journal of the Earthquake Engineering Society of Korea, volume 13, issue 1, 2009, Pages 27~34
DOI : 10.5000/EESK.2009.13.1.027
Site amplification should be considered in order to estimate Soil-Structure Interaction (SSI), seismic source and attenuation parameters with a greater degree of reliability. The horizontal to vertical (H/V) ratio technique, originally proposed by Nakamura (1989), has been applied to analyze the surface waves in microtremor records. Recently, its application has been extended to the shear wave energy of strong motion in order to study the site transfer function. The purpose of this paper is to estimate the H/V spectral ratio using the observed data from 9 seismic stations distributed within the Southern Korean Peninsula, from the Odesan earthquake (2007/01/20). The results show that most of the stations have more stable amplification characteristics in a low frequency band than in a high frequency band. However, each seismic station showed its own characteristic resonant frequency and low and high frequency. The resonant frequency at each station should be estimated carefully, because the quality of seismic data is dependent on the resonant frequency. It can be obtained more reliable results of seismic source and attenuation parameters, if seismic ground motions which deconvolved from site transfer function is used. The site amplification data from this study can be used to generally classify the sites within the Southern Korean Peninsula.
Non-linear Time History Analysis of Piloti-Type High-rise RC Buildings
Ko, Dong-Woo ; Lee, Han-Seon ;
Journal of the Earthquake Engineering Society of Korea, volume 13, issue 1, 2009, Pages 35~43
DOI : 10.5000/EESK.2009.13.1.035
Two types of piloti-type high-rise RC building structures having irregularity in the lower two stories were selected as prototypes, and nonlinear time history analysis was performed using OpenSees to verify the analysis technique and to investigate the seismic capacity of those buildings. One of the buildings studied had a symmetrical moment-resisting frame (BF), while the other had an infilled shear wall in only one of the exterior frames (ESW). A fiber model, consisting of concrete and reinforcing bar represented from the stress-strain relationship, was adapted and used to simulate the nonlinearity of members, and MVLEM (Multi Vertical Linear Element Model) was used to simulate the behavior of the wall. The analytical results simulate the behavior of piloti-type high-rise RC building structures well, including the stiffness and yield force of piloti stories, the rocking behavior of the upper structure and the variation of the axial stiffness of the column due to variation in loading condition. However, MVLEM has a limitation in simulating the abrupt increasing lateral stiffness of a wall, due to the torsional mode behavior of the building. The design force obtained from a nonlinear time history analysis was shown to be about
smaller than that obtained in the experiment. For this reason, further research is required to match the analytical results with real structures, in order to use nonlinear time history analysis in designing a piloti-type high-rise RC building.
Experimental Investigation of Lateral Retrofitting Effect with CFRP and BRB (Buckling-Restrained Brace) for Beam-column Joints of Low-Rise Piloti Buildings
Seo, Sang-Hoon ; Yoo, Yeon-Jong ; Lee, Young-Hak ; Kim, Hee-Cheul ; Lee, Ki-Hak ; Lee, Han-Seon ;
Journal of the Earthquake Engineering Society of Korea, volume 13, issue 1, 2009, Pages 45~52
DOI : 10.5000/EESK.2009.13.1.045
The purpose of this study is to evaluate the structural capacities of beam-column specimens retrofitted with CFRP sheet and BRB (Buckling-Restrained Brace) under sustained axial and cyclic lateral loads. Three specimens were made using different retrofitting methods : non-retrofitted, retrofitted with CFRP sheets only, and retrofitted with both CFRP sheet and BRB systems. Lateral load resistant capacities were evaluated based on the load-displacement relations. From the results, the maximum lateral forces of the FRP sheet retrofitted and both the FRP and BRB retrofitted specimens showed approximately 34% and 138% improvement, respectively, compared with the non-retrofitted specimen.
An Experimental Study of the Long-term Creep characteristic of High Damping Rubber Bearings
Oh, Ju ; Park, Jin-Young ; Park, Kun-Nok ; Kim, See-Dong ; Park, Sung-Kyu ;
Journal of the Earthquake Engineering Society of Korea, volume 13, issue 1, 2009, Pages 53~60
DOI : 10.5000/EESK.2009.13.1.053
Isolated structures use devices such as high damping rubber bearings (HDRB) in order to dramatically reduce the seismic forces transmitted from the substructure to the superstructure. The laminated rubber bearing is the most important structural member of a seismic isolation system. The basic characteristics of rubber bearings have been confirmed through compression tests, compressive shearing tests and creep tests. This paper presents the results and analysis of a 1000hr, ongoing creep test conducted at 7.5MPa, 8.37MPa in our laboratory. The long-term behavior of bridge bearings, such as high-damping rubber bearings, will be discovered through a compression creep test subjected to actual environmental conditions. These tests indicated that the maximum creep deformation is about
of total rubber thickness.