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时间:2019-05-13
《泰州长江公路大桥南锚基础沉降计算研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、泰州长江公路大桥南锚基础沉降计算研究冯兆祥,王建49文章编号:1003—4722(2010)01—0049—03泰州长江公路大桥南锚基础沉降计算研究冯兆祥,王建。(1.江苏省长江公路大桥建设指挥部,江苏泰州225321;2.河海大学,江苏南京21O098)摘要:泰州长江公路大桥为三塔两跨悬索桥,两岸锚碇采用沉井基础。采用工程类比法和有限元法,分别在设计和施工阶段预测该桥南锚基础的沉降值。工程类比法以已经建成的江阴长江大桥北锚为原型,基于弹性理论类比出待建的泰州长江公路大桥南锚的沉降量,施工期沉降观测值表明,实际沉降值约为类比值的60%,类比值仅能供初步设计参考。有限元法则根据锚碇浇注过程中
2、的实测沉降反演出力学参数,然后预测施工后期即架缆和桥面铺装阶段锚拉点的位移,计算结果表明,运用反演后的参数可以较准确地描述不同施工阶段沉井的变形特征,并指导后期施工。关键词:泰州长江公路大桥;锚碇;沉井基础;沉降;有限元法;计算中图分类号:U443.131文献标志码:ACalculationandResearchofSettlementofSouthAnchorageFoundationofTaizhouChangjiangRiverHighwayBridgeFENGZhao-xiang,WANGJian。(1.JiangsuProvincialYangtzeRiverHighwayBri
3、dgeConstructionCommandingDe—partment,Taizhou225321,China;2.HohaiUniversity,Nanjing210098,China)Abstract:TaizhouChangjiangRiverHighwayBridgeisathreetowersuspensionbridgeandtheanchoragesoftheBridgeonbothbanksrestoncaissonfoundations.Theengineeringanalogymethodandfiniteelementmethodareusedtorespectiv
4、elypredictthesettlementvalueofthesouthanchoragefoundationatthedesignandconstructionstages.Intheengineeringanalogymethod,thenorthanchorageofthecompletedJiangyinChangJiangRiverBridgeistakenastheprototypeandonthebasisoftheelasticitytheory,thesettlementamountofthesouthanchorageoftheTaizhouChangjiangRi
5、verHighwayBridgetobebuildisanalogized.Theobservedsettle—mentintheconstructionofthesouthanchorageshowsthattheactualsettlementvalueinthecon—structionaccountsforabout60oftheanalogizedvalueandtheanalogizedvaluecanbeonlyusedforreference.Inthefiniteelementmethod,themechanicalparametersareinverselyderive
6、dinaccordancewiththemeasuredsettlementvalueintheprocessofconcretecastingforthean—chorageandthedisplacementattheanchoringpointsofthelateperiodofconstructionofmainca—bleerectionanddecksurfacingiSpredicted.Theresultsofcalculationdemonstratethattheutili-zationoftheinverselyderivedparameterscancorrectl
7、yrepresentthedeformationcharacteristicsofthecaissonatdifferentconstructionstagesandcanguidetheconstructioninthelateperiod.Keywords:TaizhouChangjiangRiverHighwayBridge;anchorage;caissonfoundation;set—tlement;finit
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