抗风支座在高风压地区基础隔震结构中的应用研究

Research on the Application of Wind Resistant equipment in Base isolation Structure in High WindPressure Area

沿海高风压地区隔震建筑设计中,存在抗风与隔震效果及隔震层位移协调的问题。以一座基础隔震的框架结构教学楼为例,利用建筑结构分析与设计软件Etabs进行有限元分析计算。建立两个对比结构模型,一个仅设置橡胶隔震支座,另一个根据抗风计算要求,设置橡胶隔震支座和抗风支座。在正常使用工况和多遇地震工况下,抗风支座提供水平抗侧力,在设防地震工况下抗风支座钢板屈服破坏并退出工作,不影响隔震层的自由变形。计算结果表明,相对于抗震结构体系,两种模型都能显著降低上部结构地震响应。采用隔震支座和抗风支座相结合的组合隔震抗风体系,还可减少LRB铅芯支座的直径和数量,在实现抗风目标的同时,降低地震响应和工程造价,提高隔震效果,可供同类工程设计时参考。

It is a issue in the design of isolation buildings in coastal high wind pressure areas in terms of wind resistance and isolation effect.Finite element analysis and calculation are carried out by Etabs,a building structure analysis and design software.Two contrast structural models are established,one is rubber isolation support only,the other is rubber isolation support combined with wind resistance support according to the requirements of wind resistance calculation.The steel plate wind-resistant support is used to offer horizontal lateral force for the structure under normal operating conditions and seismic conditions.The steel plate are out of work under seismic conditions.The calculation results indicate that seismic response of both models can be reduced greatly,compared with the earthquake-resistant structure system.A combined system with isolated support and wind-resistant support can reduce the diameter and quantity of LRB lead core support,and reduce the seismic response and engineering cost while achieving the wind resistance goal,as well as improving the isolation effect.It can be used for reference in similar engineering design.