基于动力子结构方法的场地地震反应分析方法  

The Dynamic Substructure Method for Seismic Response of Irregular Topography

作　　者：白建方[1] 楼梦麟[2] 

机构地区：[1]石家庄铁道学院土木工程分院,石家庄050043 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《震灾防御技术》2008年第2期145-154,共10页Technology for Earthquake Disaster Prevention

基　　金：国家自然科学基金项目(50538050)资助

摘　　要：本文验证了将约束子结构法引入到复杂场地地震反应分析的可行性,并在此基础上提出了两种进一步提高计算效率的简化措施。结合土层有限元模型的自身特点,提出了标准子结构的概念,通过设置标准子结构,可减少相同子结构的重复计算。基于约束子结构本身的性质,假定土层计算区域为局部非线性,可简化等效线性化分析过程,通过数值试验给出了局部非线性区域的取值范围。算例表明,上述简化措施在提高大规模复杂场地地震反应分析计算效率方面具有显著的优势。In this paper we proposed a method of utilizing restrained mode synthesis method to analyze the seismic response of the large-scale complicated soil site. Our results show that the suggested method is practicable. Two simplified measures of the restrained mode synthesis method are presented to enhance computational efficiency. The concept of standard substructure is proposed with the consideration of soil layer property of finite element model. Repetitive computation is avoided by the proposed method of the standard substructure. Based on the property of restrained substructure and the assumption of the local nonlinear characteristic of large-scale complicated soil site, the equivalent linear method to analyze the seismic response of the soil site is simplified. The local nonlinear area in the large-scale soil site is determinated based on numerical experimentation. The results of numerical examples show that the improved method may increase the computational efficiency of seismic response analysis of the large-scale complicated site.

关 键 词：复杂场地 约束子结构模态综合法 等效线性化 局部非线性 

分 类 号：P315.9[天文地球—地震学] TU435[天文地球—固体地球物理学]