摘要
研究了动力荷载作用下单层网壳结构的失效形式和特征。通过探讨结构的耗能机理,将结构塑性累积耗能与最大变形线性组合建立了结构动力破坏分析的新量化指标。并以一个跨度40m的K8,6型单层球面网壳结构为例,分析了两种可能的结构动力失效形式及其特征,对不同矢跨比和不同荷载作用方式时的结构失效形式进行了详细的参数分析。结果表明:动力失稳呈现突变性,而动力强度破坏呈现延性,根据动力破坏指数的变化规律可判断结构发生动力失效的形式。
Aiming at the problem of dynamical failure for a single layer latticed shell under dynamic loads, the types and characters of dynamical failure were studied. A new quantity index based on the maximum displacement and plastic accumulative dissipated energy was constructed by discussing the dissipated energy mechanism. Taking a K8,6 single layer latticed shell of a 40m span as an example, two failure mechanism, the dynamic instability and dynamic strength failure, and corresponding characters were researched. Moreover, the failure form with different initial conditions was analyzed in detail. The computational results show that the dynamical instability failure occurs abruptly and that the dynamical strength failure occurs gradually, and that the form of dynamical failure can be judged by using the changing law of the dynamical failure index.
出处
《工程力学》
EI
CSCD
北大核心
2009年第7期39-46,65,共9页
Engineering Mechanics
基金
国家自然科学基金项目(50478079)
河南省教育厅项目(2009056A002)
关键词
单层网壳结构
动力破坏指数
动力失稳破坏
动力强度破坏
参数分析
single layer latticed shell
dynamical failure index
dynamical instability failure
dynamical strength failure
parameters analysis
