大连北大友谊桥维修工程施工控制.pdf

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1、桥梁建设２０１７年第４７卷第４期（总第２４５期）BridgeConstruction，Vol．４７，No．４，２０１７（TotallyNo．２４５）１１９文章编号：１００３－４７２２（２０１７）０４－０１１９－０５大连北大友谊桥维修工程施工控制１２荆友璋，吴广润（１．大连理工现代工程检测有限公司，辽宁大连１１６０２４；２．大连理工大学土木工程学院，辽宁大连１１６０２４）摘要：大连北大友谊桥为主跨１３３m的简支地锚式钢桁架悬索桥，大桥运营近３０年，出现了桥面下挠、桥塔倾斜、索鞍偏位、桥面板破损和桥面振动等病害。为保证桥梁运营安全，对该桥进行了更换桥面系、张

2、拉主缆及更换吊索等方面的维修加固。由于该桥维修加固方案具有较多的风险及不可控因素，为使加固后的结构状态满足设计要求，利用MIDASCivil软件建立全桥有限元模型，分析结构现状，通过调整主缆松弛系数模拟结构的实际状态；对桥面系拆除阶段、主缆张拉阶段、吊索与索夹更换阶段、新桥面系铺设阶段进行施工控制。结果表明，维修加固后的结构线形与内力符合预期目标，结构整体受力性能得到提高，达到了设计要求。关键词：悬索桥；钢桁架；病害；有限元法；位移；内力；施工监控；桥梁维修加固中图分类号：U４４８．２５；U４４５．７文献标志码：AConstructionControlo

3、fRehabilitationofBeidaFriendshipBridgeinDalian１２JINGYouzhang，WUGuangrun‐‐（１．ModernEngineeringTestCo．，Ltd．，DalianUniversityofTechnology，Dalian１１６０２４，China；２．SchoolofCivilEngineering，DalianUniversityofTechnology，Dalian１１６０２４，China）Abstract：TheBeidaFriendshipBridgeinDalianisasimply‐

4、supportedgroundanchoredsteeltrussgirdersuspensionbridgewiththemainspanof１３３m．Thebridgehasbeenputinoperationforabout３０yearsandthedeteriorationslikethedeckdeflection，towertitling，saddleoffsetting，deckdamageanddeckvibrationhaveappeardedinthebridge．Toensurethesafeoperationofthebridge

5、，thebridgewasrehabilitatedandstrengthenedbytheschemeofreplacingthedecksystem，tensioningthemaincablesandreplacingthesuspenders．Becausetheschemefortherehabilitationandstrengtheningofthebridgehadnumbersofthepotentialriskyanduncontrollablefactorsandtoensurethattherehabilitatedstructu

6、recouldmeetthedesignrequirements，thesoftwareMIDASCivilwasusedtosetupthefiniteelementmodelforthewholebridgeofthebridge，theexistingconditionsofthestructurewereanalyzedandtherealconditionsofthestructureweresimulatedbyadjustingtherelaxationcoefficientsofthemaincablesandinsuchway，thec

7、onstructioncontroloftheremovalstageofthedecksystem，tensioningstageofthemaincables，replacementstageofthesuspendersandcableclampsandlayingstageofthenewdecksystemwascarriedout．Theresultsyieldthatthegeometricshapesandinternalforcesoftherehabilitatedstructureareaccordantwiththeanticip

8、atedtargetsandtheglobalforceconditionsof