基于整体力学分析的自锚式悬索桥主缆找形法

A Method for Determining Cable Shape of a Self-Anchored Suspension Bridge Based on an Overall Mechanical Analysis

针对分段悬链线法收敛性能差、计算效率低,提出了一种新的数值计算方法--基于整体力学分析的自锚式悬索桥主缆坐标体系法。这种方法假设初始缆形为直线段,建立整体力学平衡方程求解锚固力,反复迭代,求出目标缆形。以新建成的河北省涉县赤水湾大桥为依托,利用Matlab编写程序,对坐标体系法计算的结果与实测结果进行比较,证明该方法具有收敛速度快,准确性高等优点,值得推广应用。

Aimed at the shortcomings of the segmental catenary method,such as poor convergence performance and low computational efficiency,this paper proposes a coordinate system method based on overall mechanical analysis(COM). In this method,the initial cable shape is assumed to be linear and the target cable shape is then calculated by iterations based on the overall equilibriums of forces. This method is used to calculate the cable shape of the Chishui Bay Bridge in Hebei Province by MATLAB,and the results are compared with measured data. The comparison shows that the proposed method has a faster convergence speed and higher accuracy.