一阶优化法在拱桥施工控制中的应用

Application of the First-Order Optimization Method in Adjustment of the Force of Cable

大跨度拱桥施工可以采用的一种方法是悬臂浇注,它采用挂篮施工,并张拉扣索对裸拱线形控制.为了充分发挥拉索的力学性能,节约物资,应力求扣索的张拉力在每个施工段相等.但是,由于整个结构是超静定的,计算困难.采用ANSYS中的一阶优化法对扣索进行优化计算,经过多次迭代计算使扣索的拉力接近相等.

It is feasible to construct the long-span-length arch bridge by the cantilever method of field pouring procedure. The arch ring is constructed by hang-basket, and the cables are pulled to control the line shape of the naked arch at the same time. In order to make full use of the cables＇ mechanical property and save materials, it is necessary to keep the value of cable force unchangeable during each construction stage. However, As the whole structure is hyperstatic, it is very difficult to calculate the results. The first-order optimization method in ANSYS is utilized to calculate the cable force. After a few calculations of iteration, the cable force is equal approximately.