斜拉桥初始平衡构形的确定方法  

Study on Method of Determining Initial Equilibrium Configuration of Cable-stayed Bridge

作　　者：陈素君[1] 张国刚[1] 唐盛华[1] 方志[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《公路交通科技》2011年第2期57-63,69,共8页Journal of Highway and Transportation Research and Development

摘　　要：为准确模拟斜拉桥成桥索力分布,在斜拉桥索力模拟常规迭代法的基础上,从迭代初值的选取和迭代加速的超松弛法两方面实现了迭代计算的加速。提出了成桥线形修正的建模坐标迭代法,与迭代加速法共同应用于斜拉桥的初始平衡构形的建立。该方法建立的初始平衡构形快速准确的模拟了斜拉桥的索力分布和成桥线形,能够作为后续分析的起始状态。通过对斜拉桥初始平衡构形的动力性能计算,分析了初应力效应、斜拉桥几何非线性及索力误差对其的影响,得出如下结论:斜拉桥动力特性分析,应考虑初应力效应和几何非线性效应的影响,并且,准确模拟斜拉桥成桥索力和线形,将使动力计算结果更为精确。To obtain the accurate simulation of the cable force distribution of cable-stayed bridge,based on the general iteration methods of cable force simulation,a method for accelerating iteration was obtained from the two aspects including the selection of initial values and over-relaxation iterative method.The modeling coordinate iteration method for bridge curve-shape correction was given,and this method was successfully applied in company with the accelerated iteration method in the modeling of initial equilibrium configuration of cable-stayed bridge.The cable force distribution and bridge curve-shape were simulated quickly and accurately by the initial equilibrium configuration of cable-stayed bridge established by the method,and it can be served as a start-state for further analyses.By calculating the dynamic property of the initial equilibrium configuration of cable-stayed bridge,the impact of initial stress,geometric nonlinearity and cable force error on the dynamic property were analyzed.It is concluded that the impact of initial stress and geometric nonlinearity should be considered in dynamic analysis of cable-stayed bridge,and accurate simulation of cable force distribution and bridge curve-shape can provide more accurate results of dynamic analysis of cable-stayed bridge.

关 键 词：桥梁工程 初始平衡构形 索力模拟 斜拉桥 迭代加速法 线形修正 动力特性 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]