影响矩阵法在施桥大桥吊杆二次调索中的应用

在系杆拱桥施工过程中,为增大结构的安全储备并保证主梁受力安全,通常对吊杆采用两次张拉,最终达到设计成桥索力,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 for Shiqiao Bridge

In order to improve the structure security and guarantee the girder＇s safety in the construction of tied-arch bridges,cables should be tensioned twice and then the expected completed cable can be achieved at last.A good method was 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 was established,and method of Penalty function was used.This method has many advantages,such as good solution,convenience and practice etc.and can also be used to minimize the error of the cable tension force in the completed state.