确定斜拉桥施工索力的正装倒拆优化法

以实验室独塔斜拉桥为研究对象，提出了确定斜拉桥合理施工索力的正装倒拆计算法，该方法按照施工顺序，在正装优化的基础上，对各节段进行倒拆计算，得到各斜拉索的基础索力，然后再通过正装迭代计算，求得各个调索阶段斜拉索的初始张拉索力和主梁的预抬量，从而避免了传统的倒拆法中难以考虑结构本身的非线性问题与正装法无法保证计算过程中一些索力设置大小的合理性等问题。本方法已经在独塔斜拉桥模型实验中成功应用。通过实验验证了该方法的有效性和可靠性，具有一定的理论价值和重要的应用价值。

Forward-back Optimization Method for Determining Construction Cable Force of Cable-stayed Bridge

Taking a single tower cable-stayed bridge test model as research object, the forward-back optimi- zation method to determine construction cable force of cable-stayed bridge is proposed in this paper. According to the construction steps, the forward optimization analysis is done firstly for a cable-stayed bridge in this method and the back analysis is executed secondly and the basic cable forces are obtained. At last, the forward iterative analysis is finished to gain the construction cable forces and the elevation of the main girder. The disadvantages such as nonlinear analysis of shrinkage and creep in concrete in the traditional back method can be avoided easi- ly, and the problems of the rationality of the cable forces in forward method are eliminated by using this method. This method has been applied successfully in a single tower cable-stayed bridge test model. The analysis results show that the method is accurate and effective and can be referrenced in similar engineering projects.