安徽大学体育馆屋盖张弦网壳结构的地震响应分析

Earthquake response analysis of cable-strut-supported shell structure of Anhui University Gymnasium

对安徽大学体育馆屋盖张弦网壳结构的动力特性进行了分析,采用时程分析法对固定铰支座和弹性支座张弦网壳结构进行水平、竖向地震作用分析,分析了上下部结构协同工作对张弦结构抗震性能的影响。结果表明,张弦网壳结构的自振频率密集,结构的低阶整体振型以竖向振动为主,刚性网壳下布置索杆施加初始预应力可以提高结构基频;8度多遇地震作用下,张弦网壳结构的水平、竖向地震作用的内力和位移响应属于同一量级,大跨度张弦网壳结构的抗震设计需要对不同方向的地震作用进行分析;大跨度张弦结构应对屋盖与下部结构整体进行地震响应分析或合理地对下部结构的刚度和惯性进行等效。

Dynamic properties of cable-strut-supported shell structure of Anhui University Gymnasium are analyzed. Responses of pin-support and elastic-support structures to horizontal and vertical earthquakes are analyzed with the time history method. Influence of supporting structure on the earthquake response of cable-strut-supported shell structure is analyzed. The result shows that frequencies of cable-strut-supported sheU structure are dense and the first mode is almost in the vertical direction. Combining prestressed cable-strut structure with rigid shell can enhance the vertical stiffness of the whole structure and then enhance fundamental frequency. In the 8 seismic fortification intensity area, the displacement and inner force responses of the structure under horizontal and vertical earthquakes are close, so during the designing of large span cable-strut structure, response analysis under earthquakes of different directions should be taken into account. Earthquake responses of the whole structure that includes supporting structure should be analyzed or reasonable methods to consider the influence of supporting structure should be developed.