考虑双重非线性的索-拱结构力学性能

应用有限元方法对桥梁工程中的索-拱结构及普通拱结构的静力性能进行对比研究。其方法是:对比研究索-拱与普通拱结构自重作用下的内力分布情况;通过对比索拱与普通拱主要控制截面的影响线研究2种结构在活载作用下的不同力学性能;结合牛顿-拉弗森法和弧长法,分别对索-拱与普通拱结构在考虑几何非线性及同时考虑几何与材料双重非线性情形的极限承载能力进行数值分析。研究结果表明,索可以非常明显地提高和改善纯拱结构的静力学性能;索-拱结构的静力学性能比普通拱结构的优。

Mechanical behavior of cable-arch structure with geometric and material nonlinear

With the finite element method,the in-depth research of static behaviors of cable stayed arch and true arch in bridge engineering were studied.The procedures were as follows:The internal force distribution of cable-stayed arch and true arch under gravity were investigated using the finite element method.The influence lines of mostly section of the two structures were studied to illustrate the mechanical behaviors under live load.Using the finite element approach in conjunction with the arc-length method and Newton-Raphson iteration,contrastive study of the limit load-carrying capacity of cable-stayed arch and true arch were presented,in which geometrical nonlinearity and double nonlinearity of structures were considered respectively.The results show that cables can improve the mechanical behaviors of normal arch evidently and effectively,and the static behaviors of cable-stayed arch are better than those of true arch.