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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Earthquake Engineering Society of Korea
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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
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Initial Shear Strength of Hollow Sectional Columns Subjected to Lateral Force
Sun, Chang-Ho ; Kim, Ick-Hyun ;
Journal of the Earthquake Engineering Society of Korea, volume 13, issue 2, 2009, Pages 1~14
DOI : 10.5000/EESK.2009.13.2.001
Ductility-based seismic design is strongly required for the rational and cost-effective design of RC piers, and a reliable evaluation of shear strength is indispensable for its success. Unlike the flexural behavior of RC columns, shear behavior is highly complex, due to its many effects such as size, aspect ratio, axial force, ductility and so on. To address this, many design and empirical equations have been proposed considering these effects. However, these equations show significant differences in their evaluation of the initial shear strength, and the reduction in strength with the increase of ductility. In this study, the characteristics of initial shear strength of hollow sectional columns were investigated using experiments with the parameters of aspect ratios, void ratios, web area ratios and load patterns. The test results were analyzed through a comparison with the values predicted by empirical equations. On the basis of the mechanical characteristics and test results, a new empirical equation was proposed, and its validity was assessed.
Seismic Analysis for Performance Assessment of Precast Segmental PSC Bridge Columns
Kim, Tae-Hoon ; Park, Se-Jin ; Kim, Young-Jin ; Shin, Hyun-Mock ;
Journal of the Earthquake Engineering Society of Korea, volume 13, issue 2, 2009, Pages 15~27
DOI : 10.5000/EESK.2009.13.2.015
The purpose of this study is to investigate the seismic behavior of precast segmental PSC bridge columns. For the analysis of reinforced concrete structures, a computer program named RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology) is used. To represent the interaction between tendon and concrete of a prestressed concrete member, a bonded or unbonded tendon element based on the finite element method is used. A joint element is modified to predict the inelastic behaviors of segmental joints. The solution of the equations of motion is obtained by numerical integration using Hilber-Hughes-Taylor (HHT) algorithm. The proposed numerical method gives a realistic prediction of seismic behavior throughout the input ground motions for numerical examples.
Prediction of Nonlinear Shear Behavior of Reinforced Concrete Beam-Column Joints
Cho, Chang-Geun ; Woo, Sung-Woo ;
Journal of the Earthquake Engineering Society of Korea, volume 13, issue 2, 2009, Pages 29~36
DOI : 10.5000/EESK.2009.13.2.029
The present study emphasizes a nonlinear model to predict the shear behaviour of reinforced concrete interior beam-column joints. To model the shear behaviour of a panel zone in the beam-column joint, a modified softened truss model theory for in-plane shear prediction was introduced. This relationship was changed to define the characteristics for the rotational spring to represent the shear deformation in the joint by an equivalent moment-rotation relationship from the joint equilibrium. The analysis model was compared with experiments on reinforced concrete interior beam-column joints that were subjected to axial and shear forces, and the current model was found to accurately predict not only the shear force but also the shear deformation in the joint.
Experimental Study on Buckling Restrained Knee Bracing Systems Using Bolted Channel Sections
Lee, Jin ; Lee, Ki-Hak ; Lee, Sung-Min ; Shin, Ji-Wook ; Kim, Young-Min ;
Journal of the Earthquake Engineering Society of Korea, volume 13, issue 2, 2009, Pages 37~46
DOI : 10.5000/EESK.2009.13.2.037
In this study, the seismic performance of the Buckling Restrained Knee Bracing (BRKB) system was evaluated through a pin-connected 1-bay 1-story frame. The BRKB system using a bolted channel section developed was composed of a steel plate as a load-resisting core member and two channel sections as a restrainment of the local and global buckling of the core plate. The main purpose of the BRKB system is to be used as an effective tool to re-strengthen/rehabilitate old low- and mid-rise RC frame buildings, which do not have enough seismic resistance to earthquake loadings. The main variables for the test specimens were the size of the core plates, stiffeners and the use of guide plates. The test results showed that the size of the core plate, which was the main element for the load-resisting member, was the most important parameter to achieve ductile behavior under tension as well as compression, until the maximum displacement exceed twice the design drift limit given by the AISC Seismic Provisions.
Seismic Fragility Analysis of Substation Systems by Using the Fault Tree Method
Kim, Min-Kyu ; Choun, Young-Sun ; Choi, In-Kil ; Oh, Keum-Ho ;
Journal of the Earthquake Engineering Society of Korea, volume 13, issue 2, 2009, Pages 47~58
DOI : 10.5000/EESK.2009.13.2.047
In this study, a seismic fragility analysis was performed for substation systems in Korea. To evaluate the seismic fragility function of the substation systems, a fragility analysis of the individual equipment and facilities of the substation systems was first performed, and then all systems were considered in the fragility analysis of the substation systems using a fault-tree method. For this research, the status of the substation systems in Korea was investigated for the classification of the substation systems. Following the classification of the substation systems, target equipment was selected based on previous damage records in earthquake hazards. The substation systems were classified as 765kV, 345kV, and 154kV systems. Transformer and bushing were chosen as target equipment. The failure modes and criteria for transformer and bushing were decided, and fragility analysis performed. Finally, the fragility functions of substation system were evaluated using the fault tree method according to damage status.
Secant Stiffness for Direct Inelastic Earthquake Design of Reinforced Concrete Structures
Eom, Tae-Sung ; Kim, Jae-Yo ; Park, Hong-Gun ;
Journal of the Earthquake Engineering Society of Korea, volume 13, issue 2, 2009, Pages 59~68
DOI : 10.5000/EESK.2009.13.2.059
For safe and economical design to provide strong earthquake resistance, the moment redistribution and plastic rotation of structures and their members needs to be evaluated. To achieve this, an earthquake design method was developed using secant stiffness analysis. To address the variation of member stiffness due to plastic rotation and moment redistribution, a structure was modeled with a beam-column element with non-rigid end connections (NREC element). Secant stiffness for the NREC element was determined based on the ductility demands of the structure and members. By performing a conventional linear analysis for the secant stiffness model, redistributed moments and plastic rotations of the members were computed. The proposed method was applied to a moment frame and two dual systems. The design results were verified using detailed nonlinear analyses.
Analysis of Lateral Retrofitting Effect by FRP and BRB for Beam-column Element Joint of Low-Rise Piloti Buildings
Kim, Min-Sook ; Yoon, So-Hee ; Lee, Young-Hak ; Kim, Hee-Cheul ;
Journal of the Earthquake Engineering Society of Korea, volume 13, issue 2, 2009, Pages 69~77
DOI : 10.5000/EESK.2009.13.2.069
The experiment was carried out to investigate lateral retrofitting effects by FRP and BRB (Buckling-Restrained Brace) for beam-column elements. These results were utilized to establish an analytical model using commercial nonlinear analysis software, PERFORM3D. Concrete and steel analytical models previously proposed by several scholars were adopted for this analytical study. A proposed analysis model showed reasonable accuracy compared with the test results on the beam-column elements strengthened FRP sheets and BRB, as well as with the non-strengthened element subjected to lateral cyclic loadings. Subsequently, the proposed modeling technique for nonlinear analysis would be helpful for preliminary analyses for retrofitting structures, by enabling engineers to estimate the improved capacity of retrofitted structural elements before performing construction.