斜靠式系杆拱桥吊杆施工初张力分析与控制

Analysis and control of preliminary tension in suspender construction of leaned tied-arch bridge

以一座支架现浇斜靠式系杆拱桥为背景,基于正装迭代法对吊杆施工初张力进行了分析。分别采用目标值法、倒拆法、影响矩阵法确定迭代初始值,研究三种方法对吊杆施工初张力求解的精度和效率。结果表明:目标值法比倒拆法和影响矩阵法迭代收敛速度慢,但其获取初始值更为方便。当精度要求不高时,可采用倒拆法或影响矩阵法确定初始值,并进行一次正装迭代验算后确定吊杆施工初张力。

With a cast-in-situ leaned tied-arch bridge as the background, the preliminary tension of suspender construction is analyzed based on the forward iteration method. The initial iteration value is determined by respectively adopting the target value method, the backward analysis method and influence matrix method, and the accuracy and efficiency of preliminary tension solution are studied by these three methods. The results show that the target value method iterates and converges more slowly than the backward analysis method and the influence matrix method , but it is more convenient to achieve the initial value by adopting the target value method. When the accuracy requirement is not high, the backward analysis method or the influence matrix method can be used in determining the iterative initial value, and the preliminary tension of suspender construction can be determined after only one time check of forward iteration.