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为了研究余震作用对单层网壳结构动力性能的影响,基于材料的应变-损伤本构模型,建立考虑地震损伤累积效应的有限元分析模型.运用非线性动力弹塑性分析方法,对一K8型单层网壳结构进行考虑主震和余震共同作用的动力损伤分析.结果表明:当主震为小震、中震或大震时,较小余震作用对结构动力性能影响可以忽略;而主震为强震时,余震对结构动力性能影响显著,结构可能在较小余震作用下发生局部动力失稳或整体倒塌现象.本文成果可为单层网壳结构抗震设计、评估与震后修复提供参考.
In order to study the effect of aftershocks on the dynamic performance of single-layer reticulated shell structures, a finite element analysis model considering the cumulative damage effect of seismic damage is established based on the strain-damage constitutive model of materials. By using the nonlinear dynamic elasto-plastic analysis method, The results show that the effect of minor aftershocks on the dynamic performance of structures can be neglected when the main shocks are small earthquakes or medium earthquakes, while the main shocks are After strong earthquakes, the aftershocks have a significant impact on the structural dynamic performance, and the structure may experience partial dynamic instability or global collapse under the effect of smaller aftershocks.The results of this paper may provide reference for the seismic design, assessment and post-earthquake rehabilitation of single-layer reticulated shell structures.