蒲山系杆拱桥吊杆张拉力的空间计算分析

以蒲山大桥为工程实例,采用有限元软件MIDAS/Civil建立了该下承式钢管混凝土拱桥的空间有限元计算模型,考虑拱桥吊杆在空间上的相互影响,给出了根据吊杆的张拉顺序利用逆序法计算拱桥吊杆第1次张拉时的初始张拉力,用影响矩阵法计算拱桥吊杆第2次、第3次张拉时的张拉力计算方法,得出了拱桥吊杆的初始张拉力按此结果进行吊杆张拉施工,吊杆内力整体上符合设计要求,所得结果可用于指导该拱桥吊杆的张拉施工,并可为同类桥梁的施工提供参考。

Spatial analysis of suspender tensile force for the pushan CFST through arch bridge

The finite element program MIDAS/Civil was used to establish the spatial finite element calculating models of the Pushan CFST(concrete filled steel tube) through arch bridge respectively.Interactive effect of suspenders of the arch bridge in space was considered.According to the stretching sequence of suspenders,the negative sequence method was introduced to calculate initial tensile force while stretching suspenders of the bridge for the first time.And the effect matrix method was introduced to the process of calculating initial tensile force for the second and the third times,initial tensile force of suspenders of the arch bridge was figured out.The tension construction of suspenders was done in according to the calculating results,the internal force of suspenders was done in accord with the design requirements.The calculating results can be used to guide construction of suspender stretching in this arch bridge.The method presented is feasible,and can offer reference to the construction of similar bridges.