城市钢箱梁桥横向分块施工分析.pdf

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1、桥梁建设2017年第47卷第1期(总第242期)BridgeConstruction，V01．47，No．1，2017(TotallyNo．242)109文章编号：1003—4722(2017)01一0109一05城市钢箱梁桥横向分块施工分析汪劲丰，张良，向华伟，陈春雷(浙江大学交通工程研究所，浙江杭州310058)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

2、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MIDASCiv订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。关键词：城市桥；连续梁桥；钢箱梁；横向分块；剪刀撑加强方案；有限元法；

3、监测分析；桥梁施工中图分类号：U448．15；U445．4文献标志码：AAnalysisofConstructionofanUrbanSteelBoxGirderBridgeinBlocksinTransVerseDirectionwANGJf托一，绷g，ZHANGL玩ng，XIANGH“n-w西，CHENC}lH聪。ZPi(InstituteofTransportationEngineering，ZhejiangUniversity，Hangzhou310058，China)Abstract：Th

4、eBeijing—HangzhouGrandCanalViaductinHangzhouCityisacontinuoussteelboxgirderbridgewithspanarrangement(37+60+37)mandwiththepartofthesteelboxgirdertotallyweighingabout932t．Tosolvethetransportationproblemofthegirderintheconstructionandacceleratetheconstruc

5、tionprogressofthebridge，theschemeofconstructingthegirderinseg—mentsinthelongitudinaldirecti。nandinblocksinthetransversedirectionwasadoptedandinthetransversedirection，thegirderwasstaggeredlycutanddivided．Toimprovethestiffnessandre—ducethestiffnessdiffer

6、encesofthesegmentsofthegirder，theschemeoftheX—bracingstiffeningforthesegmentswasproposed．Thatwas，theX_bracingswerearrangedattheopeningsofthewebsandtopplatesoratthepartswithnowebsofthesegmentsalongthebridge．Tocheckthefeasib订ityoftheschemeoftheX—bracings

7、tiffening，theMIDASCivilwasusedtosetupthefiniteelementmodelforthecentralspanofthebridge，thedisplacementandstressoftheblocksatthemidspanintheprocessofhoistingandinstallationwereanalyzedandthestressofthebridgewasmonitored．Theresultsrevealthataftertheschem

8、eofthe)(-bracingstiffeningisapplied，thede—formationandstressoftheblocksarecompatible，cansatisfythefollowingconstructionoftheweldinginthetransversedirectionandthestressofthestructureisinthesafetyrange．PracticeprovesthattheschemeoftheX—br