凯威特型单层球面网壳在强震下的失效研究  

SEISMIC FAILURE OF SINGLE-LAYER RETICULATED DOMES

作　　者：支旭东[1] 范峰[1] 沈世钊[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《工程力学》2008年第9期7-12,共6页Engineering Mechanics

基　　金：国家自然科学基金重点项目(50338010);哈尔滨工业大学优秀青年教师培养计划项目(HITQNJS.2007.029)

摘　　要：动力强度破坏是网壳结构在遭受地震时的主要失效形式,准确的失效判别需要以基于材料损伤理论的分析为基础。为在动力时程分析中考虑材料损伤累积的因素,编制了基于有限元软件ABAQUS的用户材料子程序,具有较高的计算精度和较好的收敛性,实现了网壳结构考虑材料损伤的动力有限元分析。对单层球面网壳在强震下的失效特点进行了系统的参数研究,探讨了考虑材料损伤因素对网壳失效特征的影响;综合网壳失效时刻的多项特征响应,拟合了能够评估网壳动力损伤程度的损伤模型;基于损伤模型表示的网壳极限状态的物理意义,建立了适用于跨度40m的凯威特单层球面网壳强震失效判别准则,可用之判定网壳在强震作用下的失效极限荷载。The dynamic strength failure is the main seismic failure mode of single-layer reticulated shells, and the prediction of failure load requires the consideration of material damage cumulation. A material subroutine in the platform of ABAQUS is developed for analyzing reticulated shells subjected to dynamic loads considering damage cumulation. Then, the failure behavior of single-layer reticulated domes under severe earthquakes is investigated, and the effect of damage cumulation is discussed. According to characteristic responses of single-layer reticulated domes at the failure state, the explicit definitions of failure states are established, and the strength failure criterion is proposed.

关 键 词：单层球面网壳 地震作用 动力强度破坏 损伤累积 损伤因子 

分 类 号：TU311.3[建筑科学—结构工程]