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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
Reliable Evaluation of Dynamic Ground Properties from Cross-hole Seismic Test using Spying-loaded Lateral Impact Source
Sun, Chang-Guk ; Mok, Young-Jin ; Chung, Choong-Ki ; Kim, Myoung-Mo ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 4, 2006, Pages 1~13
DOI : 10.5000/EESK.2006.10.4.001
Soil and rock dynamic properties such as shear wave velocity
, compressional wave velocity
and corresponding Poisson's ratio (v) are very important geotechnical parameters in predicting deformational behavior of structures as well as practicing seismic design and performance evaluation. In an effort to measure the parameter efficiently and accurately, various bore-hole seismic testing techniques have been, thus, developed and used during past several decades. In this study, cross-hole seismic testing technique which is known as the most reliable seismic method was adopted for obtaining geotechnical dynamic properties. To perform successfully the cross-hole test for rock as well as soil layers regardless of the ground water level, spring-loaded source which impact laterally a subsurface ground in vertical bore-hole was developed and applied at three study areas, which contain four sites composed of two existing port sites and two new LNG storage facility sites. The geotechnical dynamic properties such as
and v with depth from the soil surface to the engineering and seismic bedrock were efficiently determined from the laterally impacted cross-hole seismic tests at study sites, and were provided as the fundamental parameters for the seismic performance evaluation of the existing ports and the seismic design of the LNG storage facilities.
A Study on the Dynamic Behavior of a Various Buried Pipeline
Jeong, Jin-Ho ; Lim, Chang-Kyu ; Joeng, Du-Hwoe ; Kook, Seung-Kyu ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 4, 2006, Pages 15~24
DOI : 10.5000/EESK.2006.10.4.015
This work reports the results of our study on the dynamic response of various buried pipelines depending on their boundary conditions. We have studied behavior of the buried pipelines both along the axial and the transverse direction. The buried pipelines are modeled as beams on elastic foundation while the seismic wave as a ground displacement in the form of a sinusoidal wave. The natural frequency, its mode, and the effect of parameters have been interpreted in terms of free vibration. In order to investigate the response on the ground wave, the resulting frequency and the mode shape obtained from the free vibration have been utilized to derive the mathematical formula for the forced vibration. The natural frequency varies most significantly by the soil stiffness and the length of the buried pipelines in the case of free vibration. The effects of the propagation direction and velocity and the frequency of ground wave on the dynamic responses of concrete, steel, and FRP pipes have been analyzed and then dynamic responses depending on the type of pipes have been compared. Through performing dynamic analyser for various boundary conditions and estimation of the location of maximum strain has been estimated for the type of pipes and boundary conditions.
Development of Curve Fitted Equations for Dynamic Behavior of Various Buried Pipelines
Kim, Sung-Ban ; Jeong, Jin-Ho ; Joeng, Du-Hwoe ; Lee, Kwang-Yeol ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 4, 2006, Pages 25~33
DOI : 10.5000/EESK.2006.10.4.025
The purpose of this study is to develop the curve fitted equations for practicality and actual calculation during seismic performance evaluation of buried pipelines. Curve fitting for strain curve according to the wavelength of the seismic wave was produced using the non-linear least square method and the equations with the best results was suggested. In addition, a degree and coefficient of polynomial fitting equation needed to use curve fitted equation were identified. Interpreting process during the test of resistance of earthquake of buried pipelines with various end boundary conditions were provided through example questions. The results of this study were used to conduct a dynamic response analysis and a seismic performance evaluation of concrete, steel, and FRP pipes with various end boundary conditions.
Analytical Study on the Inelastic Behavior of Hollow Reinforced Concrete Bridge Columns under Varying Axial Load
Kim, Tae-Hoon ; Shin, Hyun-Mock ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 4, 2006, Pages 35~44
DOI : 10.5000/EESK.2006.10.4.035
The purpose of this study is to investigate the inelastic behavior of hollow reinforced concrete bridge columns under varying axial load. The role of the variable axial load is very important in the ductility, strength, stiffness, and energy dissipation. 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 proposed numerical method for the inelastic behavior of hollow reinforced concrete bridge columns under varying axial load is verified by comparison with reliable experimental results.
Study on the Earthquake Ground Motion Attenuation Characteristics in Korea and Japan using 2005 Fukuoka Earthquake Records
Choi, In-Kil ; Nakajima, Masato ; Choun, Young-Sun ; Ohtori, Yasuki ; Yun, Kwan-Hee ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 4, 2006, Pages 45~54
DOI : 10.5000/EESK.2006.10.4.045
The characteristics of the ground motion attenuation in Korea and Japan were estimated using the earthquake ground motions recorded at the equal distance observation stations by KMA, K-NET and KiK-net of Korea and Japan. The ground motion attenuation equations proposed for Korea and Japan were evaluated by comparing the predicted value fer the Fukuoka earthquake with the observed records. The predicted value from the attenuation equations shows good agreement with the observed records and each other. It can be concluded from this study that the ground motion attenuation equations developed for Japan can be used usefully for the prediction of a ground motion from far field earthquake more than 200 km and for the evaluation of the far field ground motion attenuation equations proposed fer Korea.
The Nonlinear Direct Spectrum Method Improving Application and Reliability of Existing Approximate Nonlinear Methods
Kim, Jae-Ung ; Kang, Pyeong-Doo ; Jun, Dae-Han ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 4, 2006, Pages 55~66
DOI : 10.5000/EESK.2006.10.4.055
This paper considers the nonlinear direct spectrum method to estimate seismic performance of mixed building structures without iterative computations, given dynamic property
from stiffness skeleton curve and nonlinear pseudo acceleration
and/or ductility ratio p from response spectrum. Nonlinear response history analysis has been performed and analysed with various earthquakes for evaluation of correctness and confidence of nonlinear direct spectrum method. The conclusions of this study are as follows; (1) Nonlinear direct spectrum method is considered as a practical method which is applicable to compute the structural initial elastic period and the yielding strength from stiffness skeleton owe and calculate the nonlinear maximum response of structure directly from nonlinear response spectrum. (2) The comparison of the analysis results from NDSM and NRHA showed that the average errors were less than 20% in about 3/4 of the analysis cases, and that the results obtained from NDSM turned out to be generally larger than those from NRHA.
Evaluation of Moment Transfer Efficiency of a Beam Web at RHS Column-to-Beam Connections
Kim, Young-Ju ; Oh, Sang-Hoon ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 4, 2006, Pages 67~76
DOI : 10.5000/EESK.2006.10.4.067
In this paper the moment transfer efficiency of a web and the strain concentration at the RHS (Rectangular Hollow Section) column-to-steel beam connections was evaluated. Initially, non-linear finite element analysis of five bare steel beam models was conducted. The models were designed to have different detail at their beam-to-column connection, so that the flexural moment capacity was different respectively. Analysis results showed that the moment transfer efficiency of the analytical model with RHS-column was poor when comparing to model with WF(Wide Flnage)-column due to out-of-plane deformation of the RHS-column flange. The presence of scallop and thin plate of RHS column was also a reason of the decrease of moment transfer efficiency, which would result in a potential fracture of the steel beam-to-column connections. Analytical results were compared with the previous experimental results. The analytical and the previous experimental results showed that the strain concentration was inversely proportional to the moment transfer efficiency of a beam web and the deformation capacity of connection was poor as their moment transfer efficiency degrades. Further finite element analyses of composite beam with a floor slab revealed that the neutral axis moved toward the top flange and the moment transfer efficiency of a beam web decreased, which led to premature failure of the connection.
A Study on Base Isolation Performance of Magneto-Sensitive Rubbers
Hwang, In-Ho ; Lim, Jong-Hyuk ; Lee, Jong-Seh ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 4, 2006, Pages 77~84
DOI : 10.5000/EESK.2006.10.4.077
Recently, as large structures such as high-rise building and long span bridge become lighter and more flexible, the necessity of structural control for reducing excessive dynamic response due to seismic excitation is increased. In this study, a semi-active base isolation system using Magneto-Sensitive (MS) rubbers is proposed to effectively protect structures against earthquakes. MS Rubber is a class of smart controllable materials whose mechanical properties change instantly by the application of a magnetic field. To demonstrate the performance of this device, the MS Rubber isolation system is compared to Lead-Rubber Bearing (LRB) isolation systems and judged based on computed responses to several historical earthquakes. The MS Rubber isolation system is shown to achieve notable decreases in base drifts over comparable passive systems with no accompanying increase in base shears or in accelerations imparted to the superstructure. The proposed MS Rubber system is shown to perform better than the passive isolation system.
Seismic Performance Evaluation of SRC Column by Quasi-Static Test
Han, Jung-Hoon ; Park, Chang-Kyu ; Shim, Chang-Su ; Chung, Young-Soo ;
Journal of the Earthquake Engineering Society of Korea, volume 10, issue 4, 2006, Pages 85~94
DOI : 10.5000/EESK.2006.10.4.085
In the design of bridge piers in seismic area, the ductility requirement is the most important factor. In order to enhance the seismic performance of RC columns, it is necessary to make the ductility of columns larger by covering RC columns with steel tubes or confining RC columns by arranging transverse reinforcements such as hoop ties closely. Using core steel composite columns is useful as one of the reinforcing RC columns. In this paper, quasi-static tests on concrete encased composite columns with single core steel or multiple steel elements were performed to investigate the seismic performance of the composite columns. Eight concrete-encased composite specimens were fabricated. The cross-sections of these specimens are composed of concrete-encased H-shaped structural steel columns and a concrete-encased circular tube with partial in-filled concrete. Test parameters were the amount of the transverse reinforcements, type and number of encased steel member. Through the tests, it was evaluated the ductility of SRC composite specimens. It has become clear from the test results that encased steel elements makes the deformation capacity of the columns to be larger. The displacement ductility and lateral strength of specimen with concrete-encased circular tube were indicated the biggest value.