Study on inelastic displacement ratio spectra for near-fault pulse-type ground motions  

作　　者：翟长海 李爽 谢礼立 孙亚民 

机构地区：[1]School of Civil Engineering, Harbin Institute of Technology [2]Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China

出　　处：《Earthquake Engineering and Engineering Vibration》2007年第4期351-355,共5页地震工程与工程振动（英文刊）

基　　金：National Natural Science Foundation of China Under Grants No. 50608024 andNo.50538050;Opening Laboratory of Earthquake Engineering and Engineering Vibration Foundation Under Grant No.2007001

摘　　要：In displacement-based seismic design, inelastic displacement ratio spectra （IDRS） are particularly useful for estimating the maximum lateral inelastic displacement demand of a nonlinear SDOF system from the maximum elastic displacement demand of its counterpart linear elastic SDOF system. In this study, the characteristics of IDRS for near-fault pulse-type ground motions are investigated based on a great number of earthquake ground motions. The influence of site conditions, ratio of peak ground velocity （PGV） to peak ground acceleration （PGA）, the PGV, and the maximum incremental velocity （MIV） on IDRS are also evaluated. The results indicate that the effect of near-fault ground motions on IDRS are significant only at periods between 0.2 s - 1.5 s, where the amplification can approach 20%. The PGV/PGA ratio has the most significant influence on IDRS among the parameters considered. It is also found that site conditions only slightly affect the IDRS.In displacement-based seismic design, inelastic displacement ratio spectra （IDRS） are particularly useful for estimating the maximum lateral inelastic displacement demand of a nonlinear SDOF system from the maximum elastic displacement demand of its counterpart linear elastic SDOF system. In this study, the characteristics of IDRS for near-fault pulse-type ground motions are investigated based on a great number of earthquake ground motions. The influence of site conditions, ratio of peak ground velocity （PGV） to peak ground acceleration （PGA）, the PGV, and the maximum incremental velocity （MIV） on IDRS are also evaluated. The results indicate that the effect of near-fault ground motions on IDRS are significant only at periods between 0.2 s - 1.5 s, where the amplification can approach 20%. The PGV/PGA ratio has the most significant influence on IDRS among the parameters considered. It is also found that site conditions only slightly affect the IDRS.

关 键 词：near-fault pulse-type ground motion inelastic displacement ratio spectrum ground motion parameter PGV/PGA site condition 

分 类 号：P315.9[天文地球—地震学]