基于建筑抗震设计规范的随机地震动模型研究  

STUDY OF EARTHQUAKE RANDOM MODEL BASED ON SEISMIC DESIGN CODE FOR BUILDINGS

作　　者：尹犟[1] 易伟建[1] 

机构地区：[1]湖南大学土木工程学院,长沙410082

出　　处：《工业建筑》2010年第2期58-63,共6页Industrial Construction

基　　金：国家自然科学基金资助项目(50678064);湖南省科技厅计划重点资助项目(06FJ3003)

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β(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。The paper focuses on obtaining a modified earthquake random model by introducing the structure affecting factorβ（T） into spectral density function with appropriate consideration of the structural effect on random process of ground motion. Besides, the key parameters in the model are studied in details and calculated by numerical method. The numerical results show that the structure affecting factor, determined by the equaling rules to code spectrum, is clear as a notion of physics and easy for application. In the mean time, the random mean spectrum of SDOF system derived from the modified model are well agreed with the code spectrum. The random model proposed in the paper is of relatively high accuracy and possess broad prospects of application, which will provide random seismic response analysis and dynamic reliable design with dependable references.

关 键 词：随机模型 抗震规范 结构影响因子 

分 类 号：TU352.11[建筑科学—结构工程] O211.6[理学—概率论与数理统计]