大跨网壳结构的动力倒塌判别分析
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摘要
为了研究大跨网壳结构的倒塌模式以及判别倒塌过程中各阶段所对应的临界荷载,基于LS-DYNA软件,同时考虑结构的双重非线性和材料的失效应变,对3种典型大跨网壳结构的倒塌过程进行了模拟.根据模拟结果,提出了大跨网壳结构的倒塌模式.参考增量动力分析方法,得到了带肋施威德勒网壳从动态失稳直至倒塌状态所对应的临界荷载,并且分析了地震时程响应、最大顶点位移-地震波峰值加速度和失效杆件数量-地震波峰值加速度曲线,量化了各状态对应的指标.结果表明:与地震波峰值加速度6.2 m/s2作用下顶点最大位移相比,动力局部失稳状态,顶点最大位移幅值波动135.9%;动力整体失稳状态,顶点最大位移幅值波动762.4%;整体倒塌状态,顶点最大位移幅值波动1 768.3%.
In order to study the collapse model and judge the critical loads in the various stages of large-span reticulated shell structures,the collapse process of three typical large-span reticulated shell structures were simulated with the LS-DYNA software considering the factors of the structure double nonlinearity and material failure strain.And then,the collapse mode of large span reticulated shell structures is proposed.Critical loads of Schwedler reticulated shell corresponding with from dynamic buckling to collapse state are obtained by referring incremental dynamic analysis method.Time history earthquake responses,maximum vertex displacement-seismic peak acceleration and the failure number of bars-seismic peak acceleration curve are analyzed,and then the state index is quantified.The state index is quantified.The results suggest that the maximum displacement amplitude fluctuations of vertex are 135.9%,762.4%,1 768.3% compared with that of seismic acceleration at 6.2m/s2 in the case of dynamic local buckling,dynamic overall buckling and overall collapse respectively.
引文
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