混合梁斜拉桥塔梁同步施工可行性分析

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1、桥梁建设2016年第46卷第1期(总第236期)BridgeConstruction，Vo1．46，No．1，2016(TotallyNo．236)111文章编号：1003—4722(2016)01—0111一O6混合梁斜拉桥塔梁同步施工可行性分析顾箭峰，曾祥红(1．长安大学公路学院，陕西西安710064；2．广安市交通建设质量监督管理站，四川广安638000)摘要：为研究塔梁同步施工法对混合梁斜拉桥索力和成桥状态的影响，以某跨径(45+67+416+67+45)m的双塔双索面混合梁斜拉桥为例，采用MIDASCivil有限元软件建立全桥鱼刺骨模型，模拟其采用

2、塔梁同步和先塔后梁法施工的全过程，利用影响矩阵法计算其合理成桥索力、合理施工索力及最终成桥索力，对比分析桥梁采用2种施工方法的施工索力和成桥状态，并将计算值与实测值进行对比。结果表明：2种施工方法均能使桥梁达到合理成桥状态，且它们的施工索力和成桥状态均很吻合；塔梁同步施工桥梁的成桥索力、塔顶偏位的计算值和实测值基本一致，成桥技术状态良好。因此，大跨混合梁斜拉桥采用塔粱同步施工是安全可行的。关键词：斜拉桥；混合梁；塔梁同步施工法；有限元法；仿真计算；索力确定；可行性分析中图分类号：U448．27；U441文献标志码：AFeasibilityAnalysisof

3、SynchronousConstructionofPylonandMainGirderofHybridGirderCable。StayedBridgeGUJian-feng，ZENGXiang—hong．(1_SchoolofHighway，ChanganUniversity，Xian710064，China；2．QualitySupervisionandAdministrationStationofTransportConstruction，GuanganCity，Guangan638000，China)Abstract：Tostudytheinfluen

4、cesofthesynchronousconstructionmethodofpylonandmaingirderonthestaycableforcesandcompletedbridgestateofthehybridgirdercable—stayedbridge，ahybridgirdercable—stayedbridgewithdoublepylons，doublecableplanesandwithspanarrange—ment(45+67+416+67+45)mwastakenasanexamplethefishbonebeammodelf

5、orthewholebridgeofthebridgewasestablished，usingthefiniteelementsoftwareMIDASCivilandthewholeprocessofthesynchronousconstructionmethodofthepylonandmaingirderandthemethodofconstructingthepylonfirstandthemaingirderlatewassimulated．Thereasonablecompletedbridgestaycableforces，reasonable

6、initialstaycableforcesandthefinalcompletedbridgestayca—bleforceswerecalculatedbytheinfluencematrix，theinitialstaycableforcesandcompletedbridgestateofthebridgeconstructedbythetwoconstructionmethodswereanalyzedandthecalculatedandmeasuredvalueswerecompared．Theresultsindicatethatwithbo

7、ththetWOconstructionmethods，thereasonablecompletedbridgestateofthebridgecanbeachievedandtheinitialstaycableforcesofthetwomethodsareaccordantwiththecableforcesofthecompletedbridgestate．ThecalculatedandmeasuredvalUesofthecompletedbridgestaycableforcesandpylontopdis—placementofthebrid

8、geconstructedbythesynchron