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以地震作用下精细化有限元分析的单层球面网壳的动力失稳破坏模式为基础、结合细胞自动机(CA)方法,发展了一套单层网壳动力失稳破坏模式和失效荷载的联合预测方法。首先,对基础单层球面网壳进行了简谐荷载作用下全荷载域动力时程有限元分析(FEA),并时时提取各级动荷载幅值下所有节点的位移值及单元的应变能密度。之后,用建立的联合方法预测了其它同类网壳的动力失稳破坏模式及失效荷载,并与相应FEA计算结果进行了分析比较。结果表明,所提出的联合方法,在一定程度上能基于一个单层球面网壳的动力失稳破坏模式和失效荷载预测其它不同跨度、不同矢跨比、不同杆件截面尺寸的单层球面网壳的动力失稳破坏模式及失效荷载。因此,结合FEA数值模拟,实现了CA方法在单层球面网壳动力失稳破坏模式和失效荷载预测中的应用。
Based on the dynamic instability failure mode of the single-layer spherical reticulated shell under the action of earthquake, a set of dynamic failure modes and failure loads of single-layer reticulated shell were developed based on the cellular automata (CA) method. Joint prediction method. First of all, the finite element analysis (FEA) of full-scale dynamic loads of a single-layer spherical reticulated dome under simple harmonic load is performed, and the displacement values of all nodes under dynamic loads and the strain energy densities . Afterwards, the established joint method is used to predict the dynamic failure modes and failure loads of other similar reticulated shells, and the results are compared with the corresponding FEA results. The results show that the proposed joint method can to some extent be based on the dynamic failure mode of a single-layer reticular shell and the failure load prediction of single-layer spherical net with different span, different ratio of cross-over and cross-section Dynamic failure mode and failure load of shell. Therefore, combined with FEA numerical simulation, the CA method is applied to the failure mode and failure load prediction of single-layer spherical reticulated shells.