考虑边界条件影响的网架结构抗震性能研究

Seismic performance analysis of grid structure considering the effect of boundary conditions

空间网架结构的动力响应分析通常采用数值模拟的方法进行。其建模方式通常采用上部网架结构单独建模或整体建模。对网架支座节点的处理,通常将网架支座节点简化为铰支座,因此在分析过程中无法考虑支座损伤的影响。本文通过对芦山某体育馆,采用上部网架结构单独建模和整体建模进行分析对比,得出考虑协同工作与否对网架结构动力响应的影响。并根据实际支座构造,建立了考虑支座节点损伤的网架结构整体模型,探究支座节点损伤对网架结构动力响应的影响。计算结果显示,上部网架结构单独建模与整体建模计算得到的网架结构的动力响应差别较大,因此必须考虑上下部结构的协同作用。在考虑支座损伤后,网架结构的动力响应较不考虑支座损伤时差异较大,因此在进行网架结构动力响应分析时,不可忽略支座损伤的影响。

The dynamic response analysis of the space grid structure is usually carried out by numerical simulation.The modeling method is usually modeled separately or integrated by the upper grid structure.For the treatment of the roof joint,the roof joint is usually simplified as a hinge,so the influence of the damage of roof joint cannot be considered in the analysis process.In this paper,through a separate modeling and overall modeling of a gymnasium in Lushan,the differences in dynamic response of the space grid structure are considered.According to the structure of roof joint,the overall model of the grid structure considering the damage of the roof joint is established,and the influence of the damage of the roof joint on the dynamic response of the grid structure is explored.The analysis results show that the dynamic response of the grid structure obtained by the separate modeling and the overall modeling calculation is quite different,so the synergy of the upper and lower structures must be considered.After considering the damage of the roof joint,the dynamic response of the grid structure is much different.Therefore,when the dynamic response analysis of the grid structure is carried out,the influence of the damage of the roof joint cannot be ignored.