正装优化法确定斜拉桥合理施工状态

Forward-calculating optimization method for determining rational construction state of cable-stayed bridges

为确定斜拉桥的合理施工状态,使其成桥后达到理想成桥状态,采用正装优化法,建立索力优化的二次规划模型,并在模型中引入加权系数来更好地实现多目标控制参数的调整,使理想成桥状态下控制目标的不闭合差降至最低。运用该正装优化法对仙桃汉江公路大桥的施工张拉索力进行了优化计算。结果表明,该方法力学概念明确、计算速度快,克服了倒拆法等确定施工状态时难以闭合的弊端。

In order to determine rational construction state and obtain perfect finished dead state of the cable stayed bridge, a quadratic programming model for optimizing cable force is put forward, which diminishes the distinction of the parameter to the least. The adjustment of multiobject controlling parameter is achieved by using the weight numbers in the optimization model. In the optimization calculation of cable-stayed bridge based on Hanjiang Highway Bridge at Xiantao, the forward-calculating method is used, and the results show that its mechanics concept is definite, the rate of calculation is fast, and some disadvantages of other methods, such as backward analysis method, are avoided. 4 figs, 9 refs.