城市钢箱梁桥横向分块施工分析

发布时间：2018-08-22 16:56

【摘要】：杭州市跨京杭运河高架桥为(37+60+37)m连续钢箱梁桥,钢箱梁总重约932t。为解决钢箱梁运输难题、加快施工进程,该桥钢箱梁采用纵向分段、横向分块施工方案,钢箱梁横向采用错位分割。为提高梁段的刚度并降低各梁段刚度的差异,提出剪刀撑加强方案,即在梁段的腹板与顶板开口处及缺失腹板处沿顺桥向增设剪刀撑。为分析剪刀撑加强方案的可行性,采用MIDAS Civil建立中跨有限元模型,分析吊装及安放过程中各梁块跨中处的位移与应力,并对实桥应力进行监测。结果表明:采用剪刀撑加强方案后,各梁块的变形和应力均较为协调,满足后续横向焊接施工要求;结构应力处于安全范围。实践证明,剪刀撑加强方案能够满足钢箱梁横向分块施工的控制要求。
[Abstract]:Hangzhou City across the Beijing-Hangzhou Canal viaduct is (37 6037) m continuous steel box girder bridge, the total weight of steel box girder about 932 t. In order to solve the transportation problem of steel box girder and speed up the construction process, the steel box girder of the bridge adopts longitudinal section, transverse block construction scheme, and transverse dislocation division of steel box girder. In order to improve the stiffness of the beam segment and reduce the difference of the stiffness of each beam segment, the paper puts forward the strengthening scheme of the scissors bracing, that is, adding the scissors brace along the bridge along the side of the bridge at the opening and missing web of the web and roof of the beam segment. In order to analyze the feasibility of the strengthening scheme of shear braces, the finite element model of middle span was established by MIDAS Civil, the displacement and stress of each beam block in the middle of span during hoisting and placement were analyzed, and the stress of real bridge was monitored. The results show that the deformation and stress of each beam block are in harmony with each other, and the structural stress is in the safe range. It has been proved that the shear bracing scheme can meet the control requirements of steel box girder transverse block construction.
【作者单位】：浙江大学交通工程研究所;
【基金】：国家自然科学基金项目(51578496) 浙江省自然科学基金重点项目(LZ16E080001)~~
【分类号】：U445.4

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