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动力倒塌分析是空间结构研究的重要课题之一。动力失效破坏临界风速是网壳结构抗风雪设计的重要依据。本研究基于非线性有限元理论和弹塑性动力响应时程分析理论,模拟了具有时空相关性的随机风速时程曲线,考虑了均布雪荷载在网壳表面的不同分布,建立了三向网格单层柱面网壳结构有限元模型。对比分析了在不同均布风雪荷载组合作用下网壳结构整体稳定性的影响,结果显示,单层柱面网壳在迎风面有雪荷载作用时的失效破坏临界风速最小,而在背风面有雪荷载作用时的失效破坏临界风速最大。
Dynamic collapse analysis is one of the important topics in the study of space structure. Dynamic failure damage to critical wind speed is an important basis for the design of snow-capped shelters. Based on nonlinear finite element theory and time-history analysis theory of elasto-plastic dynamic response, this study simulates the stochastic wind-time-history curves with space-time correlation. Considering the different distribution of uniform snow loads on the surface of the shell, a three- Finite element model of single layer cylindrical reticulated shell. The results show that the critical wind speed of failure failure of single-layer cylindrical reticulated shell with snow load is the smallest when the wind load is on the windward side, Failure with snow load failure damage the critical wind speed maximum.