Displacement-based seismic design of self-centering structural system

Pao Yue-kong Library Electronic Theses Database

Displacement-based seismic design of self-centering structural system

 

Author: Li, Chenyang
Title: Displacement-based seismic design of self-centering structural system
Degree: M.Sc.
Year: 2011
Subject: Earthquake resistant design.
Buildings -- Earthquake effects.
Structural analysis (Engineering)
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Civil and Structural Engineering
Pages: iv, ix, 123 leaves : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2462910
URI: http://theses.lib.polyu.edu.hk/handle/200/6357
Abstract: Performance-based Seismic Design (PBSD) and Self-centering Structural System (SSS), which are potential next-generation seismic design method and seisrmc structures, respectively, have attracted more and more attentions. Dr. Songye Zhu had proposed a feasible PBSD Procedure for low-rise Self-centering steel frame with SMA wire brace. But in this method, two main issues had been identified one is multiple mode shapes issue and the other is multiple seismic level issue. This dissertation is focused on the modification of PBSD Procedure proposed by Zhu towards multiple seismic level issue. In the original PBSD Procedure, all design process is performed under Design Basis Earthquake level (DBE level) and then checked design scheme under Frequent Earthquake level (FE level) and Maximum Considered Earthquake (MCE level). In here, FE, DBE and MCE are three seismic hazard levels described in FEMA-445. But performance-based design is not always controlled by DBE level. MCE and FE level may become control level. This is termed multiple seismic level issue in this dissertation. According to the characteristics of this issue, a judgement step is proposed to be added before main design step in this PBSD procedure to judge which level is controlling among DBE, FE, and MCE by empirical Relation Formula. The empirical Relation Formula is a general approximation relation between expected performances under three hazard levels. If MCE or FE is control level, then we can execute PBSD under MCE or FE using Modified PBSD Procedure with the corresponding spectrum. The effectiveness of this modified method had been proved in nonlinear dynamic analysis of four test groups (6-story and 3-story by original method and modified method respectively) based on Incremental dynamic analysis (IDA). Moreover, a reasonable performance level is still an issue to be solved. For example, although in theory, arbitrary target level can be set, there still exists a reasonable range for inter-story drift ratio. Only those target level is located in this range, then effective and precise PBSD can be achieved. So in future, we still need substantial breakthrough in design theory and idea.

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