索穹顶结构有限元分析及试验研究

针对索穹顶结构的受力性能,采用二节点直线杆单元和新型二节点曲线索单元建立了索穹顶结构混合有限元计算模型,对是否考虑拉索自重垂度进行了比较分析.通过对一直径为5 m的肋环型索穹顶模型的实验研究,得到在不同荷载情况下结构的内力和变形规律.实验结果表明,材料下料长度的确定和符合计算模型的节点设计是实际工程设计中的关键问题.实验结果说明了此有限元模型具有较好的精度.

Finite element analysis and experimental research on cable domes

As cable dome is a geometrically flexible structure,studies on its behavior should take into ac-count the nonlinear features.In the work,a set of cable dome nonlinear finite element equations was pro-posed involving two-node bar elements and two-node curved cable elements.The sag effect due to the ca-ble deadweight was also considered.Detailed experimental research was conducted on a model with diame-ter of5m and the behavior of the model subject to different external loads was investigated.The experi-mental results' good consistency with analytical results proved that the proposed nonlinear analytical model is reliable and effective.The experimental research also indicates the correct length of cables and struts and the proper design of nodes are the two key points of cable dome structures.