某大跨网架结构屋盖隔震整体分析

Roof-isolation Integral Analysis of One Long-span Space Truss Structure

本文在分析大跨空间网架自身结构特性的基础上,提出采用柱顶隔震方法作为该类结构的减震措施。研究了橡胶支座与滑移支座两类隔震装置用于网架结构柱顶隔震的工作机理,进而以某大跨网架结构为例,对具有不同自振周期的网架结构采用不同隔震装置在不同地震波下隔震效果进行了对比。结果表明:两类隔震支座在网架柱顶隔震中均有较好的隔震效果,相对橡胶支座而言,滑移隔震支座受结构动力特性与地震波输入的影响较小。

Roof isolation is put forward in this paper based on the characteristic of the long span space truss structure. Two different isolator including lead rubber bearing and sliding isolated bearing are put in the roof structure and their working mechanism are studied. One long-span space truss is applied to contrast the isolation effect of different isolators used in space truss structures of different natural vibration periods with different earthquake input. Result shows that the both isolator have good isolation effect. Sliding isolated bearing is less influenced by structure dynamic characteristics and earthquake wave input than lead rubber bearing.