斜拉桥索力精确模拟的矩阵分析法

用ANSYS对斜拉桥进行建模时,需要输入初始索力,但ANSYS并没有直接提供施加初内力的方法,只能利用单元的生死特性、单元初应变或者温度荷载来模拟斜拉索索力。讨论了单次模拟法和循环迭代法存在的问题,提出了一种基于矩阵分析的方法;考虑斜拉索索力之间的相互影响,修改了循环迭代公式,能实现索力的精确模拟,并证明常规的循环迭代法只是矩阵分析法的特例。通过苏通大桥斜拉桥索力的精确模拟,验证了该方法的可行性,为以后类似问题的ANSYS二次开发提供了思路。

Matrix Analysis Method for Precise Simulation of Cable Force of Cable-Stayed Bridge

In the process of establishing model of cable-stayed bridge by use of ANSYS,it is necessary to input the initial cable force precisely.But there is no simple method provided by ANSYS to obtain the initial internal force directly,so other alternative methods should be used,such as element birth and death,the initial strain method and the temperature load method.After discussing the problems of single simulation method and cyclic iteration method,a new method based on matrix analysis is proposed.This method considers the mutual influence of cable force,modifies the cyclic iteration formula,and simulates precisely the cable forces of cable-stayed bridges.At the same time,the conventional cyclic iteration method is proved as special cases of matrix analysis method.The feasibility is verified by cable force simulation of Sutong cable-stayed bridge.The method also provides thought to further develop ANSYS and solve similar problems.