先梁后拱法施工轨道交通梁拱体系桥梁吊杆张拉行为研究

Suspender Tension Method of Beam-arch Combined Bridge with Beam-first-and-arch-next Construction Craft for Rail Transit

结合实际工程对梁拱组合体系桥吊杆控制张拉力4种确定方法(倒拆法、正装—倒拆迭代法、无应力状态控制法和影响矩阵法)的实施步骤及结果进行有限元计算研究分析,并针对从拱脚向拱顶、拱顶向拱脚及1/4主跨向两侧3种张拉顺序过程中的结构受力状态进行有限元计算对比分析,结果表明:不同吊杆张拉顺序下各构件均能满足设计需求,但对于体系复杂、规模较大的梁拱组合体系,吊杆张拉过程可能出现部分构件受力超标现象,因此需重视吊杆张拉顺序比选。

Four kinds of suspender tension methods（dismantling suspender tension in reverse order, remove-installation iteration method, no stress state control method and impact matrix method） of beam-arch combined bridge are studied, and implementation steps and the results of different methods are given. In addition, the stress states of structure in different tensioning sequence（from the arch foot to vaults, from vaults to the arch foot and from the quarter of the main span to both sides） are studied. The research provided the basis for the suspender tension behavior. The results show that the components can meet the design requirements in the sequence of different hanger rods, while for the complex and large-scale beam-arch combined bridge system, the tension of some members will exceed the specification in the tension process of the hanger rod. Therefore, it is necessary to pay attention to the suspender tension sequence.