钢管混凝土系杆叠拱桥吊杆张拉方案分析

Analysis of Tensioning Scheme of Hanger of Concrete Filled Steel Tubular Tied Arch Bridge

为确定钢管混凝土系杆叠拱桥的吊杆张拉方案,基于常见的张拉方案,提出了3种吊杆张拉方案(①吊杆一次张拉到位,拆除梁部支架;②吊杆分两次张拉到位,拆除梁部支架;③吊杆一次张拉后,拆除梁部支架,吊杆二次张拉),采用有限元分析软件MIDASCivil建立全桥有限元模型进行仿真计算,分析3种方案吊杆的成桥索力、拱肋位移、拱肋混凝土应力、拱肋钢管应力、系梁位移、系梁应力。结果表明3种方案均能满足设计要求,方案3为设计方案,提出另2种方案并验证了可行性,为施工单位提供更多方案参考。

In order to determine the hanger tension method of the Series bar arch bridge with Concrete steel tube,based on the common tension scheme,three hanger tension method are proposed.(1)Pull the hanger in place at one time,remove the beam support(2)The hanger is divided into two tensioning positions and the beam support is removed;(3)After the hanger is stretched once,the beam support is removed and the hanger is stretched twice.The finite element analysis software MIDAS Civic is used to establish a finite element model for the entire bridge for simulation calculation.Three kinds of schemes are analyzed:bridge cable force,arch rib displacement,arch rib concrete stress,arch rib steel pipe stress,girder displacement and girder stress.The results show that all three schemes can meet the design requirements.The third scheme is the design scheme.The other two schemes are proposed and verified in this paper,providing more reference for the construction units.