拉索对肋环型索穹顶结构的敏感性分析

针对在施工张拉过程中索穹顶结构拉索的初始预应力值难以与设计值一致的问题，为了找出索穹顶结构中的敏感拉索以指导设计与施工，采用正交设计方法分析了拉索对结构的敏感性。通过建立L49(78)正交表，以一个跨度为50 m，承受轴对称荷载作用的肋环型索穹顶结构为例，研究了拉索对结构的静力、动力及稳定的敏感性，并与其他敏感性分析方法作了比较。分析结果表明，拉索对结构的静力敏感性明显高于对动力和稳定的敏感性，并且拉索对结构的敏感性高低与拉索的位置有关，在整个结构中以外环索最为关键，在设计与施工中必须严格控制其应力状态。

Sensitivity analysis of cables to Geiger dome structure

For resolving the problem of the initial prestresses of cable dome structures being inconsistent with the design values during the construction,in order to find the sensitive cables to guide the design and construction,an orthogonal design method was adopted to investigate the prestressed cables' sensitivity to the structure.A 50 m-span Geiger cable dome under symmetric loading was studied by establishing a(L_(49)(7~8)) orthogonal tables.Nonlinear static,dynamic,stability analyses were carried out respectively to(identify) the sensitivity of the cables to the structure,and this orthogonal design method was compared with the commonly used method.The results show that the static behaviors of the cables in the Geiger cable dome are much more sensitive than the dynamic and stability behaviors,and that the sensitivity depends on the location of the cables.The outermost hoop cable is most important and must be strictly controlled in the design and construction of this structure.