基础隔震底框砖房三维时程反应分析

Analysis for the 3-Dimensinonal Time History Response of a Base-Isolated Building Structure

摘要: 利用三维有限元分析程序，对传统抗震底框砖房和基础隔震底框砖房分别建立相应三维有限元分析模型。按照建筑抗震设计规范要求，进行时程分析时应按建筑场地类别和设计地震分组选用实际强震纪录和人工模拟的加速度时程曲线。选择三条实际强震纪录的加速度时程曲线和一条人工模拟的加速度时程曲线，对两种三维有限元模型进行了多遇地震和罕遇地震作用下时程反应分析。从时程分析结果的对比可知：对传统抗震结构采用基础隔振技术措施可以有效增加建筑物的自振周期，从而降低建筑物的地震反应。通常，隔震结构的设防烈度可以比传统抗震结构设防烈度降低1~2度，这样不仅可以取得较好的经济效益，而且可以更好的保护人类生命和财产的安全。

Abstract: In this paper, the three-dimensional analytical models of traditional anti-seismic and base-isolated masonry and concrete frame composite structures were created by the three-dimensional finite element code. In the light of code for seismic design of buildings, when buildings were analyzed by the time history method, the strong earthquake records and artificial acceleration time-history curves shall be selected based on the intensity, the design seismic group and site-class. Three sets of strong earthquake records and one set of artificial acceleration time-history curve were chosen in the analysis. Both the models were computed under the action of frequently occurred earthquake or rarely occurred earthquake under the actions of different seismic waves. The comparison between those results shows that the period of the traditional anti-seismic structure is prolonged by the base-isolated technology and the action of the earthquake will be reduced greatly. Usually the seismic fortification intensity of base-isolated structure is one or two degree less than that of traditional anti-seismic structure. It is adopting the base-isolated structure that will protect the life- safety and property of people and achieve good economic benefits.