文档介绍：基于建筑抗震设计规范的随机地震动模型研究*
尹犟易伟建
(湖南大学土木工程学院, 长沙 410082)
摘要: 适当考虑结构对于地面运动随机过程的影响, 将结构影响因子 B(T )引入谱密函数表达式中, 得
到一种修正的随机地震动模型, 并对该模型中的关键参数进行了详细研究及数值计算。结果表明, 根据规范
谱等效原则标定的结构影响因子物理意义明确、应用方便; 由修正模型得到单自由度体系加速度反应均值谱
与现行规范谱吻合良好。提出的模型具有较高的精度及广泛的应用前景, 为结构随机地震反应分析及动力
可靠性设计提供了可靠的依据。
关键词: 随机模型; 抗震规范; 结构影响因子
STUDY OF EARTHQUAK E RANDOM M ODEL BA SED ON
SE ISM IC DE SIGN CODE FOR BU ILD ING S
Y in Jiang Y iW eijian
( College ofC ivil Engineering, H unan Un iversity, Changsha 410082, China)
Ab stra ct: The pape r focuses on obta in ing a mod ified earthquake random m odel by introducing the structure a ffecting
fac torB(T ) into spectra l density function w ith appropriate consideration of the structura l effect on random process of
ground m otion. Besides, the key param eters in the m ode l are stud ied in deta ils and calculated by num erical me thod.
The num erica l results show that the struc ture affecting factor, de term ined by the equa ling rules to code spectrum, is
c lear as a notion ofphys ics and easy for applica tion. In the m ean tim e, the random m ean spec trum of SDOF system
de rived from the m od ified m ode l a re we ll agreed with the code spectrum. The random model proposed in the paper is
of re latively h igh accuracy and possess broad prospec ts of application, wh ich will provide random seism ic response
ana lysis and dynam ic re liab l