内外组合张弦网壳结构基于向量式有限元的断索分析(英文)

Cable rupture analysis of inner-outer combined reticulated shell-string structure using VFIFE

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.

Post-damage behaviors of an inner-outer combined reticulated shell-string structure employed by Yueqing new gymnasium after cable ruptures are investigated. Analytical results such as redistributions of internal forces and nodal displacements of the structure after continuous ruptures in different cables are obtaind by developed VFIFE program and the birth-dead element method in ANSYS. Through static analyses of load state, the program of VFIFE is validated. Simulation of dynamic procedures after cable ruptures demonstrates the advantages of VFIFE in dealing with nonlinear structural dynamic problems. Numerical results show the inner-outer combined reticulated shell-string structure has good resistance against progressive damages in that it has adequate static load carrying capacity after individual cable rupture. However, the structural responses are amplified as a result of dynamic effects, which may lead to instability of the reticulated shell in local areas close to the ruptured cables. This study provides references for the future maintenance and cable exchange of the structure, as well as the collapse resistance design of pre stressed spatial structures.