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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。
In order to accurately simulate the cable force distribution of cable-stayed bridge, based on the conventional iterative method of cable force simulation of cable-stayed bridge, the acceleration of iterative computation is realized from the selection of iterative initial value and the over-relaxation method of iterative acceleration. The modeling coordinate iteration method of bridge alignment was proposed and the initial equilibrium configuration of cable-stayed bridge was established with the iterative acceleration method. The initial equilibrium configuration established by this method can simulate the cable force distribution and linearity of cable-stayed bridge quickly and accurately, which can be used as the initial state of subsequent analysis. Through the calculation of the dynamic performance of the initial equilibrium configuration of the cable-stayed bridge, the effect of initial stress effect, the geometric nonlinearity of the cable-stayed bridge and the influence of the cable force error are analyzed. The following conclusions are drawn: The dynamic characteristics of the cable-stayed bridge should be considered Stress effects and geometric nonlinear effects, and to accurately simulate the cable-stayed bridge cable force and linear, will make the power calculation results more accurate.