影响矩阵法在斜拉桥二次调索中的应用

在斜拉桥施工过程中为增大结构的安全储备并保证主梁受力安全,对斜拉索采用两次张拉,最终实现预想的成桥状态,由此提出二次调索施调索力、顺序的计算问题。以影响矩阵理论为基础,建立了二次调索最优控制的数学模型,采用惩罚函数法求解,该方法计算精确、简便、实用,也可用于成桥后索力的误差调整。

Application of Influence Matrix Method to Secondary Cable-Adjustment of Cable-Stayed Bridges

In order to improve the structure security and guarantee the girder's safety in the construction of cable-stayed bridges,cables should be tensioned twice and then the expected completed state can be achieved at last.A good method is proposed to calculate the cable tension forces and the adjusted order.Based on the theory of influence matrix,an optimized control model to solve the second cable adjustment is established,and the method of penalty function is used.This method has many advantages,such as high preciseness,convenience and practice etc.,which can also be used to minimize the error of the cable tension force at the completed state.