分段支架施工斜拉桥初始索力的确定

根据建立的施工仿真分析模型,取合理成桥索力为初次迭代索力,按正装计算得到一个成桥状态,将该成桥状态与设计成桥状态比较,得到成桥状态下各控制参数与设计成桥状态下目标值的调整量,经线性优化模型得到各拉索新的张拉力,进入下一轮正装计算,直至收敛为止。针对某斜拉桥的结构特点和施工需要,并利用其主梁采用分节段支架搭设的受力特性,确定了该桥斜拉索的施工初始索力。

Determined of Initial Cable Force in Stentering Steel Timber Construction of Cable-stayed Bridge

According to construction model,the finished state was obtained with forward-calculation by presuming the reasonable completed cable force compare it with ideal finished state,we can modify the controlling cable tensing forces to minimize the difference values between the result and the predetermined value of the reasonable finished bridge by the least squares method.Iterate the aforesaid procedure until the value was constringed.For the structural characteristic of the cable-stayed bridge and construction,and make full use of characteristics the step-by-step stentering steel timber,we attain initial cable force of bridge.