【摘要】：杭州市跨京杭運河高架橋為(37+60+37)m連續(xù)鋼箱梁橋,鋼箱梁總重約932t。為解決鋼箱梁運輸難題、加快施工進程,該橋鋼箱梁采用縱向分段、橫向分塊施工方案,鋼箱梁橫向采用錯位分割。為提高梁段的剛度并降低各梁段剛度的差異,提出剪刀撐加強方案,即在梁段的腹板與頂板開口處及缺失腹板處沿順橋向增設剪刀撐。為分析剪刀撐加強方案的可行性,采用MIDAS Civil建立中跨有限元模型,分析吊裝及安放過程中各梁塊跨中處的位移與應力,并對實橋應力進行監(jiān)測。結果表明:采用剪刀撐加強方案后,各梁塊的變形和應力均較為協(xié)調(diào),滿足后續(xù)橫向焊接施工要求;結構應力處于安全范圍。實踐證明,剪刀撐加強方案能夠滿足鋼箱梁橫向分塊施工的控制要求。
[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.
【作者單位】： 浙江大學交通工程研究所;
【基金】：國家自然科學基金項目(51578496) 浙江省自然科學基金重點項目(LZ16E080001)~~
【分類號】：U445.4

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