大跨度钢桁架结构弹塑性时程分析

Inelastic Time-history Analysis of a Long-span Steel Truss Structure

大跨度屋盖结构需要进行弹塑性分析来验证"大震不倒"的设防要求。以某体育馆屋盖钢桁架工程为背景,进行弹塑性动力时程分析,研究其在8度罕遇地震作用下的动力响应和关键构件的损伤情况。分析结果表明:结构最大位移小于其限值;主结构的塑性铰主要出现在桁架腹杆上,数量很少;结构整体刚度没有下降,内力未达到最大承载力。总体来说,本结构能够在罕遇地震作用下实现"大震不倒",满足预定的抗震设防性能目标。

Inelastic analysis needs to be used to prove the safety of long-span steel truss structure under rare earthquakes. An inelastic time history analysis was carried out on a gymnasium, and the seismic performance under different level earthquakes was studied in detail. Analysis results show that under 8-degree rare earthquake, the maximum displacement meets code requirements; few members of the main structure yield, the stiffness and the load-carrying capacity of the structure are not decreased. Generally speaking, this building structure can fulfill the principle of no collapse under seldom earthquake action specified in the national seismic design code.