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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
Shear Capacity Curve Model for Circular RC Bridge Columns under Seismic Loads
Lee, Jae-Hoon ; Ko, Seong-Hyun ; Chung, Young-Soo ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 2, 2006, Pages 1~10
DOI : 10.5000/EESK.2006.10.2.001
Reinforced concrete bridge columns with relatively small aspect ratio show flexure-shear behavior, which is flexural behavior at initial and medium displacement stages and shear failure at final stage. Since the columns with flexure-shear failure have lower ductility than those with flexural failure, shear capacity curve models shall be applied as well as flexural capacity curve in order to determine ultimate displacement for seismic design or performance evaluation. In this paper, a modified shear capacity curve model is proposed and compared with the other models such as the CALTRANS model, Aschheim et al.'s model, and Priestley et al.'s model. Four shear capacity curve models are applied to the 4 full scale circular bridge column test results and the accuracy of each model is discussed. It may not be fully adequate to drive a final decision from the application to the limited number of test results, however the proposed model provides the better prediction of failure mode and ultimate displacement than the other models for the selected column test results.
Seismic Improvement of Staggered Truss Systems using Buckling Restrained Braces
Kim, Jin-Koo ; Lee, Joon-Ho ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 2, 2006, Pages 11~19
DOI : 10.5000/EESK.2006.10.2.011
In this paper the seismic performances of 4, 10, and 30-story staggered truss systems (STS) were evaluated by observing the force-displacement relationship up io failure. The results were compared with the seismic performance of conventional moment resisting frames and braced frames. According to the analysis results, the STS showed relatively satisfactory lateral load resisting capability. However, in the mid- to high-rise STS, plastic hinges formed first at the chords were transferred to vertical members of the vierendeel panels, which formed a week link and subsequently leaded to brittle collapse of the structure. Therefore to enhance the ductility of STS it would be necessary to reinforce the vertical bracing members of the virendeel panels so that the plastic hinges, once toned in cord members of a virendeel panel, spread out to virendeel panels of neighboring stories.
A Dynamic Condensation for Tall Buildings with Active Tuned Mass Damper
Jung, Yang-Ki ; Qu, Zu Qing ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 2, 2006, Pages 21~29
DOI : 10.5000/EESK.2006.10.2.021
It is impractical to install sensors on every floor of a tall building to measure the full state vector because of the large number of degrees of freedom. This makes it necessary to introduce reduced order control. A kind of system reduction scheme (dynamic condensation method) is proposed in this paper. This method is iterative and Guyan condensation is looked upon as an initial approximation of the iteration. Since the reduced order system is updated repeatedly until a desired one is obtained, the accuracy of the reduced order system resulting from the proposed method is much higher than that obtained from the Guyan condensation method. An eigenvalue shilling technique is applied to accelerate the convergence of Iteration. Two schemes to establish the reduced order system by using the proposed method are also presented and discussed in this paper. The results for a tail building with active tuned mass damper show that the proposed method is efficient for the reduced order modelling and the accuracy is very close to exact only after two iterations.
Seismic Performance Assessment of RC Bridges using Nonlinear Finite Element Analysis
Kim, Tae-Hoon ; Shin, Hyun-Mock ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 2, 2006, Pages 31~38
DOI : 10.5000/EESK.2006.10.2.031
The purpose of this study is to assess the seismic performance of reinforced concrete bridges using nonlinear finite element analysis. The accuracy and objectivity of the assessment process may be enhanced by the use of 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. Material nonlinearity is taken into account by comprising tensile, compressive and shear models of cracked concrete and a model of reinforcing steel. The smeared crack approach is incorporated. The proposed numerical method is applied to reinforced concrete bridges and compared.
Development of Site Classification System and Modification of Design Response Spectra considering Geotechnical Site Characteristics in Korea (I) - Problem Statements of the Current Seismic Design Code
Yoon, Jong-Ku ; Kim, Dong-Soo ; Bang, Eun-Seok ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 2, 2006, Pages 39~50
DOI : 10.5000/EESK.2006.10.2.039
Site response analyses were peformed based on equivalent linear technique using the shear wave velocity profiles of 162 sites collected around the Korean Peninsula. The she characteristics, particularly the shear wave velocities and the depth to bedrock, are compared to those in the western United States. The site coefficients of short period
and the long period
obtained from this study were significantly different compared to 1997 Uniform Building Code (1997 UBC).
underestimated the motion in shot period ranges and
overestimated the motion in mid period ranges in Korean seismic guideline. It is found that the existing Korean seismic design code were is required to be modified considering geological site conditions in Korea for the reliable estimation of sue amplification. Problems of the current seismic design code were dicussed in this paper and the development of site classification method and modification of desing response spectra were discussed in the companion papers(II-Development of Site Classification System and III-Modification of Dosing Response Specra).
Development of Site Classification System and Modification of Design Response Spectra considering Geotechnical Site Characteristics in Korea (II) - Development of Site Classification System
Yoon, Jong-Ku ; Kim, Dong-Soo ; Bang, Eun-Seok ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 2, 2006, Pages 51~62
DOI : 10.5000/EESK.2006.10.2.051
In the companion paper (I-Problem Statements of the Current Seismic Design Code), the current Korean seismic design code is required to be modified considering site characteristics in Korea for the reliable estimation of site amplification. In this paper, three site classification methods based on the mean shear wave velocity of the top 30m
, fundamental site periods
and bedrock depth were investigated and compared with each other to determine the best classification system. Not enough of a difference in the standard deviation of site coefficients
to determine the best system, and neither is the difference between the average spectral accelerations and the design response spectrum of each system. However, the amplification range of RRS values based on
were definitely concentrated on a narrow band than other classification system. It means that sites which have a similar behavior during earthquake will be classified as the same site category at the site classification system based on
. The regression curves between site coefficients and
described the effect of soil non linearity well as the rock shaking intensity increases than the current method based on
. Furthermore, it is unambiguous to determine sue category based on
when the site investigation is performed to shallower depth less than 30m, whereas the current
is usually calculated fallaciously by extrapolating the
of bedrock to 30m. From the results of this study, new site classification system based on
was recommended for legions of shallow bedrock depth in Korea.
Development of Site Classification System and Modification of Design Response Spectra considering Geotechnical Site Characteristics in Korea (III) - Modification of Desing Response Specra
Yoon, Jong-Ku ; Kim, Dong-Soo ; Bang, Eun-Seok ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 2, 2006, Pages 63~71
DOI : 10.5000/EESK.2006.10.2.063
In the companion paper (II, Development of Site Classification System), new size classification system based on site periods
was recommended for legions of shallow bedrock depth in Korea. Despite the site classification method was improved, the response spectrum would be required to be modified by adjusting the integration interval to calculate the site coefficients because the response spectra did not match well the average spectral accelerations obtained by site response analyses in the range of long periods. In this paper, new response spectra for each site categories were determined by adjusting the integration interval of long period site coefficient
second. It matched well the average spectral accelerations and new response spectrum, and it was also improved compared to the current she classification system.
Analytical Study on the Inelastic Behavior of Reinforced High-Strength Concrete Bridge Columns
Shin, Hyun-Mock ; Lee, Heon-Min ; Sung, Dae-Jung ; Kim, Tae-Hoon ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 2, 2006, Pages 73~81
DOI : 10.5000/EESK.2006.10.2.073
The purpose of this study is to investigate the inelastic behavior of reinforced high-strength concrete bridge columns. A computer program, named RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), for the analysis of reinforced concrete structures was used. Material nonlinearity is taken into account by comprising tensile, compressive and shear models of cracked concrete and a model ol reinforcing steel. The smeared rack approach is incorporated. The increase of concrete strength due to the lateral confining reinforcement has been also taken into account to model the confined high-strength concrete. The proposed numerical method for the inelastic behavior of reinforced high-strength concrete bridge columns is verified by comparison with reliable experimental results.
Experimental Verification on the Availability of Robust Saturation Controller for the Active Vibration Control of Building using AMD
Lim, Chae-Wook ; Moon, Seok-Jun ; Park, Youn-Gjin ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 2, 2006, Pages 83~90
DOI : 10.5000/EESK.2006.10.2.083
In active vibration control of building, controller design considering both control input saturation of controller and parameter uncertainties of building is needed. In our previous research, we proposed a robust saturation controller which guarantees robust stability and control performance of the uncertain linear time-invariant system in the presence of control input saturation. In this paper, the availability of the robust saturation controller for the building with an active mass damper (AMD) system is verified through experimental tests. Experimental tests are carried oui using a two-story building model with a hydraulic-type AMD.