大跨度斜拉桥几何非线性静力计算分析

Geometric Nonlinear Static Analysis of Long-span Cable-stayed Bridge

以斜拉桥作为研究对象,对斜拉桥的几何非线性问题进行了详细的介绍,并讨论了斜拉桥非线性分析的几种基本方法,编制相应的计算程序对几座典型的实桥进行了计算分析。计算结果表明,斜拉桥这种柔性结构在恒载作用下是高度非线性的,跨径越大,几何非线性表现得越突出,结构分析与设计中考虑几何非线性的影响就显得十分必要。

In this paper, all sources of geometric nonlinearity of the cable stayed-bridge are described. And several methods for nonlinear analysis are discussed. A finite element computation program for nonlinear static analysis of the cable-stayed bridge is developed and debugged and adopted in several typical cable-stayed bridges. The following conclusion may be drawn from this study： Cable-stayed bridges are highly nonhnear structures under the effect of their own dead weight. As the bridge span increases, the bridge becomes more flexible and, as a result, more susceptible to geomrtric nonlinear behavior. It is more essential for us to deal with nonlinear analysis in the structure analysis and design of cable-stayed bridges.