摘要
引入结构屈服水平系数,建立了结构的延性需求谱,使地震动的幅值特性和频谱特性可以分开考虑。利用双线性单自由度体系的时程反应分析结果,对延性需求系数的条件分布类型进行了假设检验,通过回归得到了Ⅰ类和Ⅱ类场地上延性系数的条件均值和条件标准差的拟合公式。在此基础上,提出了延性系数的统计参数的计算方法,建立了随机的延性需求谱,进而可获得随机的弹塑性位移反应谱。
By introducing the yielding level factor and constructing the ductility demand spectrum, the characteristic of peak values and frequency contents of ground motions are considered separately. Taking advantage of nonlinear time history analysis results of a single-degree-of-freedom system with the hysteretic model of bilinear, conditional distribution type of ductility demand factors are verified by goodness-of-fit tests. The formulations of the conditional mean and standard deviation of ductility demand factor for soil type Ⅰ and Ⅱ are obtained by nonlinear regression. Utilizing these formulations and the conditional probabilistic density function of ductility demand factor, the calculation method of the statistics of ductility factor is proposed, and the probabilistic ductility demand spectrum and displacement response spectrum are established.
出处
《工程力学》
EI
CSCD
北大核心
2006年第5期14-19,共6页
Engineering Mechanics
基金
国家自然科学基金资助项目(50378034)
教育部博士点专项基金资助项目(20030532020)
关键词
工程抗震
延性需求谱
屈服水平系数
条件分布
延性系数
弹塑性位移反应谱
earthquake resistant engineering
ductility demand spectrum
yield level factor
conditional distribution
ductility factor
inelastic displacement response spectrum
