双套拱塔斜拉桥索力张拉优化及控制

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1、桥梁建设2012年第42卷第4期(总第214期)BridgeConstruction，Vo1．42，No．4，2012(TotallyNo．214)107文章编号：1003—4722(2012)04—0107—06双套拱塔斜拉桥索力张拉优化及控制李冬，朱巍志，张哲(大连理工现代工程检测有限公司，辽宁大连116024)摘要：为研究双套拱塔斜拉桥施工控制技术，尤其是塔间索及斜拉索的张拉方案合理性及张拉控制方法，以小凌河大桥为背景，采用MIDASCivil有限元软件建立该桥空间计算模型，进行施工过程的模拟计算，根据计算结果对拉索安装和张拉方案进行了优化。优化后，赋予塔

2、间索初张拉无应力长度，二次调索时调整到成桥状态的无应力长度；斜拉索自内而外安装并张拉，索力小于250kN的斜拉索，调整其初张拉无应力长度使索力满足测量要求，其他斜拉索直接张拉到设计的无应力长度。监控结果表明，采用优化后的索力张拉方法对该类桥梁进行施工控制，整个施工过程中结构安全、受力明确，得到的成桥索力误差小。关键词：斜拉桥；施工控制；无应力状态；斜拉索；索力；有限元法；优化中图分类号：U448．27文献标志码：AOptimizationandControlofTensioningofCablesofCable-StayedBridgewithDouble-Se

3、tArchPylonsLIDong，ZHUWei-zhi，ZHANGZhe(ModernEngineeringTestCo．，Ltd．，DalianUniversityofTechnology，Dalian116024，China)Abstract：Tostudytheconstructioncontro1techniquesforthecable—stayedbridgewithdoub—le—setarchpylons，particularlytherationalityoftheschemesandcontrolmethodsfortensioningof

4、thecablesbetweenthepylonsandthestaycablesofthebridge，theXiaolingRiverBridgeofsuchtypewascitedasanexample．ThespatialcalculationmodelforthebridgewasestablishedbythefiniteelementsoftwareMIDASCivil，thesimulationcalculationoftheconstructionprocesswasmadeandtheinstallationandtensioningofth

5、ecableswereaccordinglyoptimizedintermsoftheresultsofthecalculation．Aftertheoptimization，theunstressedlengthwasgiventotheini—tialtensioningofthecablesbetweenthepylons，theunstressedlengthwasthenadjustedtotheunstressedlengthofthecompletedbridgestatuswhenthesecond—timecableforceadjustmen

6、twascarriedout．Thestaycableswereinstalledandtensionedfromtheinnersidetotheoutersideandforthestaycableswithcableforceslessthan250kN，theunstressedlengthoftheinitia1tensio—ningofthesecableswasadjustedtomakethecableforcesmeetthemeasurementrequirementswhilefortherestofthestaycables，theywe

7、redirectlytensionedtothedesignedunstressedlength．Theresultsofthemonitoringandcontroloftheconstructionprocessshowthatbymeansoftheconstructioncontrolofthebridgeofsuchtype，usingtheoptimizedcabletensioningmeth—od。thestructureofthebridgeinthewholeconstructionprocessiSsafe，theforceconditio

8、nsareclearan