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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 8, Issue 6 - Dec 2004
Volume 8, Issue 5 - Oct 2004
Volume 8, Issue 4 - Aug 2004
Volume 8, Issue 3 - Jun 2004
Volume 8, Issue 2 - Apr 2004
Volume 8, Issue 1 - Feb 2004
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Seismic Behavior of High-rise Steel Moment-resisting Frames with Vertical Mass Irregularity
Park, Byong-Jeong ; Song, In-Hawn ;
Journal of the Earthquake Engineering Society of Korea, volume 8, issue 1, 2004, Pages 1~15
DOI : 10.5000/EESK.2004.8.1.001
Dynamic analyses were carried out to study the seismic response of high-rise steel moment-resisting frames in sixteen story buildings. The frames are intentionally designed by three different design procedures; strength controlled design. strong column-weak beam controlled design. and drift controlled design. The seismic performances of the so-designed frames with vertical mass irregularities were discussed in view of drift ratio. plastic hinge rotation, hysteretic energy input and stress demand. A demand curve of hysteretic energy inputs was also presented with two earthquake levels in peak ground accelerations for a future design application.
Direct Inelastic Earthquake Design Using Secant Stiffness
Journal of the Earthquake Engineering Society of Korea, volume 8, issue 1, 2004, Pages 17~27
DOI : 10.5000/EESK.2004.8.1.017
A new earthquake design method performing iterative calculations using secant stiffness was developed. The proposed design method has the advantages of convenience and stability in numerical analysis because it uses elastic analysis. At the same time, the proposed design method can accurately estimate the strength and ductility demands on the members because it performs the analysis on the inelastic behavior of structure using iterative calculation. In the present study, the procedure of the proposed design method was established, and a computer program incorporating the proposed method was developed. Design examples using the proposed method were presented, and its advantages were presented by the comparisons with existing design methods using elastic or inelastic analysis. The proposed design method, as an integrated method of analysis and design, can address the earthquake design strategy devised by the engineer. such as ductility limit on each member, the design concept of strong column - weak beam, and etc. In addition, through iterative calculations on the structure preliminarily designed only with member sizing, the strength and ductility demands of each member can be directly calculated so as to satisfy the given design strategy. As the result. economical and safe design can be achieved.
Response Modification Factors of Inverted V-type Special Concentrically Braced Frames
Journal of the Earthquake Engineering Society of Korea, volume 8, issue 1, 2004, Pages 29~37
DOI : 10.5000/EESK.2004.8.1.029
The overstrength factor and the ductility factor are the two important factors that determine response modification factors used in current seismic codes, In this paper the overstrength and ductility factors of special concentric braced frames are determined by performing pushover analysis of model structures with various stories and span lengths. and by using those factors the response modification factors are obtained. According to the analysis results. the overstrength and the ductility factors are larger than the values proposed by the codes in low-rise structures. and the opposite is true in medium to high-rise structures, It is also found that the factors increase as the height of structures decreases and the span length increases.
Seismic Performance Evaluation of Building Structures Based on the Adaptive Lateral Load Distribution
Journal of the Earthquake Engineering Society of Korea, volume 8, issue 1, 2004, Pages 39~58
DOI : 10.5000/EESK.2004.8.1.039
It is very important that predict the inelastic seismic behavior exactly for seismic performance evaluation of a building in the performance based seismic design. Evaluation method of seismic performance based on the pushover analysis reflected in PBSE was developed by some researchers. For the evaluation of inelastic global and local seismic responses by pushover analysis exactly. lateral load distribution should be adjusted and reflected the dynamic characteristics of structural system and various seismic ground motions. And performance point should be determined based on the evaluation of reasonable deformation capacity of a building more exactly. An effective method based on the improved the adaptive lateral load distribution and the equivalent responses of a multistory building is proposed in this study to efficiently estimate the accurate inelastic seismic responses. The proposed method can be used to evaluate the seismic performance for the global inelastic behavior of a building and to accurately estimate its local inelastic seismic responses. In order to demonstrate the accuracy and validity of this method, inelastic seismic responses estimated by the proposed method are compared with those obtained from other analytical methods.
A Study on Generalization of Cyclic Plasticity Model and Application of 3-Dimensional Elastic-Plastic FEM of SM570
Journal of the Earthquake Engineering Society of Korea, volume 8, issue 1, 2004, Pages 59~65
DOI : 10.5000/EESK.2004.8.1.059
Recently, as steel structures become higher and more long-spanned, application of high strength steel. SM570, is considered, For accurate seismic design, seismic analysis of steel structures needs a constitutive equation describing the characteristic of steel materials under non-proportional cyclic loading, While the use of SM570 material is much increased these days, research for description and generalization of cyclic plasticity behavior are insufficient, In this study, a cyclic plasticity model is proposed by results of material tests, i.e, monotonic and low cycle tests, Proposed cyclic plasticity model is applied to 3-Dimensional FE program and we carried out seismic analysis of pipe-section steel pier using SM570, Comparison between experiment and analysis results shows that the proposed constitutive equation is able to describe exactly the complicated plastic behavior of steel structure using SM570.
Evaluation of Capacity Spectrum Methods for Seismic Fragility Analysis of Bridges
Kim, Sang-Hoon ; Yi, Jin-Hak ; Kim, Ho-Kyung ;
Journal of the Earthquake Engineering Society of Korea, volume 8, issue 1, 2004, Pages 67~76
DOI : 10.5000/EESK.2004.8.1.067
This study presents the evaluation of CSM(Capacity Spectrum Method, ATC-40) in developing fragility curves for a sample concrete bridge. The CSM is originally developed as one of the simplified procedures for building structures, while this study adopts the CSM to develop fragility curves of bridge structures. Four(4) different approaches are demonstrated and the fragility curves developed are compared those by the nonlinear time history analysis. Fragility curves in this study are represented by lognormal distribution functions with two parameters and developed as a function of PGA. The sixty(60) ground acceleration time histories for the Los Angeles area developed for the Federal Emergency Management Agency (FEMA) SAC(SEAOC-ATC-CUREe) steel project are used for the bridge analysis. The comparison of fragility curves by the CSM with those by the time history analysis indicates that the agreement is excellent for one of the methods investigated in this study. In this respect. it is recommended that the demand spectrum might be improved according to the guidelines suggested in this study. However, this observation might not always apply, depending on the details of specific bridge characteristic
Seismic Protection for Multiple Span Continuous Steel Bridges using Shape Memory Alloy-Restrainer-Dampers
Park, Eunsoo ; Kim, Haksoo ;
Journal of the Earthquake Engineering Society of Korea, volume 8, issue 1, 2004, Pages 77~86
DOI : 10.5000/EESK.2004.8.1.077
This paper introduces a shape memory alloy-restrainer-damper(SMA-RD) to protect multiple span continuous steel bridges from seismic loads. The type of bridges has only one fixed bearing condition on a pier and expansion bearings are located on the other piers and abutments. Due to this state and a big mass of the deck, these bridges are usually very vulnerable to column's damage on which fixed bearings are located and large deformation of abutments in passive action. Two types of SMA-RDs are developed, and their effect is inspected for protecting the bridges through seismic analyses. Conventional steel restrainer cables are also used to reduce the seismic vulnerability of the bridge and the results are compared to those of the SMA-RDs.