H型平面布置多层冷弯薄壁型钢结构抗震分析

Seismic analysis of the multilayer cold- formed thin- walled section steel structures with H plane layout

基于H型钢截面良好的受力性能,设计了一种H型平面布置的多层冷弯薄壁型钢结构。结合有限元分析软件,对该结构进行了不同工况下的弹塑性地震时程计算,分析了结构的位移响应、层间位移、顶层加速度等参数。结果表明:(1)6种地震烈度下,结构层间位移角均满足规范要求。9度罕遇地震下,结构顶层X向最大位移为9.213mm,Y向最大位移为5.432mm,位移响应较小;(2)结构在高烈度地震下,顶层加速度超过10000mm/s2,结构颤动频率高,但是构件均未进入塑性,结构处于安全状态。综合分析结果,采用H型平面布置的多层冷弯薄壁型钢结构具有较好的抗震能力,建议工程中考虑使用该种平面布置方式。

based on the good mechanical properties of H section steel, a kind of multilayer cold - formed thin - walled steel structure with H -type layout was designed. Elastoplastic seismic response time history calculation of the structure under different working conditions was carried out, and the displacement response, drift of story and the acceleration of top floor of the structure were analyzed. The results show that ： （ l ） the drift angle of the struc- ture meet the code requirements under six seismic intensities, the maximum displacement of the top floor in X-di- rection is 9. 213ram, that in Y-direction is 5. 432mm, i. e. smaller. （2） the acceleration response of the top floor is bigger than 10000mm/s2 under high intensity earthquake, and the structure shakes badly, but it is still in a safe state without the plastic deformation; comprehensive analysis results persent that, the multilayer cold -formed thin -walled steel structure with H layout has good seismic resistance capasity, and it is suggested to consider the use of this kind of plane layout for engineering.