Effects of ground motion scaling on the response of structures considering the interdependency between intensity measures and scale factors

被引:13
作者
Wen, Weiping [1 ,2 ]
Ji, Duofa [1 ,2 ]
Zhai, Changhai [1 ,2 ]
机构
[1] Harbin Inst Technol, Key Lab Struct Dynam Behav & Control, Minist Educ, Harbin 150090, Peoples R China
[2] Harbin Inst Technol, Key Lab Smart Prevent & Mitigat Civil Engn Disast, Minist Ind & Informat Technol, Harbin 150090, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
Interdependency; Intensity measure; Scale factor; Bias; Ground motion scaling; INELASTIC DISPLACEMENT RATIOS; DAMAGE SPECTRA; RECORDS; ACCELERATION; SELECTION;
D O I
10.1016/j.engstruct.2019.110007
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Ground motion scaling has been widely applied in seismic design and evaluation to perform nonlinear dynamic analysis. However, the quantitative interdependency between intensity measures (IMs) and scale factors (SFs) has not received sufficient attention in previous studies. In this study, effects of ground motion scaling are investigated by considering the effects of IMs and SFs on the response of structures. The bias introduced by ground motion scaling is defined as the difference in engineering demand parameter values obtained from seismic demand models developed with scaled and unscaled ground motions. The bias and allowable SF are comprehensively used to quantify the interdependency between IMs and SFs. Eight different IMs are selected, and 1593 ground motions are collected from the PEER NGA-West2 database. The results indicate that the Housner spectrum intensity is superior to the other IMs based on the entire period region, and that it can control the bias to within about 20% even for a SF as large as 10.0. The spectral acceleration and peak ground velocity are secondary alternatives, and the corresponding biases are generally within 40% when the ground motions are scaled within five times (i.e., the SF varies from 0.2 to 5.0). The allowable SFs are determined for various IMs when the acceptable bias is assumed as 20%.
引用
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页数:11
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