摘要
阻尼折减系数是建筑抗震设计中确定设计地震作用的重要参数之一。该文采用简谐正弦波和25条集集地震记录,基于单自由度体系不同阻尼比水平的位移反应谱研究了有效地震动持时对阻尼折减系数影响。分析结果表明:阻尼折减系数随有效地震动持时比和简谐激励循环数的增加而减小。基于分析结果的统计平均值,通过非线性多元回归分析给出了考虑地震动持时影响的阻尼折减系数谱。
Damping reduction factor is one of the important parameters to determine the design earthquake force for building＇s structural seismic design. Employing the displacement response spectra of single-degree-of freedom systems with different levels of damping ratios, the present study investigates the effects of the effective ground motion duration on damping reduction factor. The ground motion durations are associated with 25 Chi-chi earthquake records and harmonic sine wave. The study shows that damping reduction factor decreases with the increasing of the effective duration of the ground motion and the number of cycles of harmonic excitation. A nonlinear multiple regression analysis based on the statistical mean value of the present study is employed, and a modified damping reduction factor considering the effects of ground motion duration is suggested.
出处
《工程力学》
EI
CSCD
北大核心
2009年第2期78-84,共7页
Engineering Mechanics
关键词
抗震设计
地震动持时
阻尼折减系数
位移反应谱
有效持时
seismic design, ground motion duration, damping reduction factors, displacement response spectra, effective duration
