不变形预张力在斜拉桥设计中的应用

Application of un-deformed Pretension of Cable for the Design of Cable-Stayed Bridges

基于不变形预张力的基本概念,建立了斜拉桥成桥状态的多目标、多约束的优化模型,并通过有限元程序求解成桥索力.该方法的优点是在施加不变形预张力时不切断索,这正符合了施工过程中张拉的实际情况;在索力设计中,将控制目标直接选为多个节点的位移和控制截面的内力,从而使控制目标值达到和接近了设计者的期望水准.实例表明,该方法是有效的,便于实际工程的应用.

Based on the basic concept of the un - deformed pretension of cable, the optimization model of finished state with multi - objective and multi - constraint is used. The cable force of finished state is acquired by element program. The method is in accordance with the fact that the cable is not cut off during the construction. During the design of cable tension, the multi - node and internal force of the control section are selected as the controlling objective. At the same time, the objective can reach the expectation of the designer. The correctness and validity of the method are verified by examples. The method is convenient for real engineering.