基础隔震钢桁架结构的地震响应分析.pdf

24 4 Vol. 24, No. 4 2008 8 Structural Engineers Aug. 2008 杜 炎 钟铁毅 李 宇 (, 100044) 采用铅芯橡胶支座建立了钢桁架结构基础隔震的有限元 力分析模型, 计算了有隔震和无隔 震钢桁架结构的自振周期, 对地震激励下有隔震和无隔震钢桁架结构进行了地震响应的时程分析,并进 一步进行了地震响应的能量分析分析结果表明: 采用基础隔震技术后,钢桁架结构通过延长自身的自 振周期避开了地震的卓越周期, 同时依靠隔震支座的变形耗能, 有效地减少了输入到结构中的地震能 量,这就降低了上部结构的地震响应,使大部分构件处于弹性工作阶段, 从而达到保护主体结构的目的 钢桁架结构, 基础隔震技术, 铅芯橡胶支座, 地震能量 Seism ic Respon se Analysis for Steel Truss Structures w ith Seism ic Isolation Foundations DU an ZHONG T ieyi LI u (Beijing Jiaotong University, Beijing 100044, China) Abs tract FEM software was used to build the analytic model of steel truss structures w ith lead rubber bearings and common bearings. The natural period, frequency, transient responses and seism ic energy responses of wt o models were computed. The analytic results indicate that after using base seism ic isolated technology, the natural period of structure w ith seism ic isolation foundation can be extended to avoid the principal period of the ground and the earthquake energy is efficiently consumed by the deform ation of seism ic isolated bearings. So the responseof the superstructure can be reduced to make suremostof the superstructure isworking under the elastic phase and the superstructure iswellprotected. K eyword s steel truss structure, base seism ic isolated technology, lead rubber bearing, earthquake energy , , , , ( , ), ,, , , 1 , , , , , , : , , , : 2008- 01- 25 77 24 4 , , ,,