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对乐清市新体育馆采取的一种新型内外组合张弦网壳结构进行了断索分析.利用自编向量式有限元(VFIFE)程序模拟分析不同位置径向索相继断裂后该结构的内力重分布及节点变位情况,并和ANSYS生死单元法的计算结果进行比较.荷载态静力分析结果检验了向量式有限元程序在进行静力计算的正确性,而断索过程的模拟更展现了该方法在处理结构非线性动力问题的优越性.分析结果表明,内外组合张弦网壳结构在个别径向索发生断裂的情况下尽管稳定性能有所降低,依然能够继续承载,具有较好的抵抗连续破坏的能力.然而在动力效应的影响下,结构响应有一定程度的放大,断索附近的网壳相对容易出现局部失稳.本文工作为该结构的维护检修、拉索更换以及预应力空间结构的抗倒塌设计提供了参考.
A new type of open-ended reticulated shell structure adopted by the new stadium in Yueqing City was analyzed by using the self-compiled vector finite element program (VFIFE) to simulate and analyze the internal force redistribution of the structure with successive fractures of radial cables at different positions. Node displacements were compared with the results of ANSYS method.The results of load-state static analysis verified the correctness of the vector finite element program in the static calculation, and the simulation of the broken-line process further demonstrated the method The results show that both the internal and external combined string-string reticulated shell structures can continue to bear the load even though their stability is reduced under the condition of fractures of individual radial cables, and have better resistance to continuous However, under the influence of dynamic effect, the structural response is magnified to a certain extent, and the partial reticular shell near the broken cable is prone to partial instability.This paper is mainly concerned with the structural maintenance, cable replacement and prestressed spatial structure The anti-collapse design provides a reference.