单层球面网壳在强震作用下的损伤模型

为获得单层球面网壳强震损伤模型,采用ABAQUS软件并自主开发了考虑损伤累积影响的材料子程序,对跨度40m单层球面网壳在强震作用下的全过程动力响应进行了参数研究.统计结构的多项宏、微观响应,建立了理想单层球壳在强震作用下的损伤模型;同时,对考虑初始缺陷的单层球面网壳也进行了分析,比较了是否考虑初始缺陷对结构抗震性能及失效机理的影响,在此基础上建立了考虑初始缺陷单层球面网壳的损伤模型,提出了强震下结构的强度破坏判别准则.

A damage model of single-layer reticulated domes under severe earthquakes

To obtain the damage model of single-layer reticulated domes subjected to earthquakes,the FEM program ABAQUS was applied to solve the responses of structures and the UMAT subroutine was compiled for the consideration of material accumulation. Single-layer reticulated domes with span of 40 m subjected to severe earthquakes were studied by changing structural and loading parameters. According to the responses of single-layer reticulated domes,the damage model of ideal reticulated shells under earthquakes was established. The effect of structural geometric imperfections was discussed,and then the damage model and the dynamic strength failure distinguishing criterion with consideration of structural geometric imperfections were proposed.