基于 Midas 有限元下的大跨斜拉桥成桥索力优化

为了深化对大跨斜拉桥成桥索力优化问题的认识，根据斜拉桥合理成桥状态的确定原则，阐述各类方法的求解思路与优化过程。大跨斜拉桥成桥索力优化，仅靠一种方法完成索力优化是不够精确的。通过论述斜拉桥合理成桥状态的基本原则，介绍了常用的几种成桥索力优化方法。首先选择最小弯曲能法获得初始索力，并使用影响矩阵法进行二次优化，对成桥索力状态进行叙述。基于大型有限元软件Midas Civil建立斜拉桥模型，以合理成桥状态为控制目标，对背景桥梁成桥索力进行优化。

Optimization of Cable Forces of Long-span Cable-stayed Bridges Based on Midas Finite Element

In order to deepen the understanding of the cable force optimization of long-span cable-stayed bridges, the solution ideas and optimization processes of various methods are expounded according to the principle of determining the reasonable completed state of cable-stayed bridges. It is not enough accurate to optimize the cable force of long-span cable-stayed bridge only by one method to complete the optimization of cable force. The basic principles of the reasonable completed bridge state of cable-stayed bridge are discussed, and several common optimization methods of complete bridge cable force are introduced. Firstly, the minimum bending energy method is selected to obtain the initial cable force, and the influence matrix method is used to carry out the secondary optimization. The complete state of the bridge cable force is described. The large finite element software Midas Civil is based to establish the cable-stayed bridge model. Taking the reasonable complete-state bridge as the control objective, the complete bridge cable force of the background bridge is optimized.