半柔性悬挂结构分析的子结构模态法  

SUBSTRUCTURING MODAL SYNTHESIS TECHNIQUE FOR ANALYSIS OF SEMI-FLEXIBLE SUSPENSION STRUCTURE

作　　者：王春林[1] 吕志涛[1] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室

出　　处：《工程力学》2008年第2期17-21,共5页Engineering Mechanics

基　　金：国家自然科学基金项目(50178018);东南大学优秀博士学位论文基金项目(200706)

摘　　要：针对一种半柔性悬挂减振结构提出其简化计算方法。根据这种结构的特点,将柔性悬挂层作为连接子结构,应用子结构模态综合法分析结构动力特性,得到结构的简化运动方程;分析了柔性层与悬挂楼面层间刚度比和综合模态数对结构简化计算精度的影响;提出了确定参与综合模态数的选取方法;基于模态综合法进行了算例的时程分析对比。结果表明:采用合理的子结构模态法减少了参与结构分析的自由度数目;综合模态数对结构计算精度的影响更显著。子结构模态法具有应用方便、计算精度高的特点,完全可以满足工程分析的需要。Aiming at a new semi-flexible suspension structure, a simplified calculation method is presented. Based on its characteristics, the modal synthesis method of substructures is applied to the dynamic analysis by considering suspended flexible layer as the link substructure, and the simplified equation of dynamic motion of a semi-flexible suspension structure is given. Under the influence of the lateral stiffness ratio of the flexible layer to suspended floors and the number of modes synthesized, the precision of the simplified technique is analyzed and the time history analysis is applied by this technique. The results show that the degree of freedom participated in structural analysis is decreased by this right modal synthesis method, and the effect of precision is influenced remarkably by the number of modes synthesized. This technique is convenient and effective and can meet the practical demand.

关 键 词：建筑结构 子结构法 悬挂结构 柔性层 连接子结构 振动控制 

分 类 号：TU973.19[建筑科学—结构工程]