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1、第34卷第5期公路交通科技Vol．34No．52017年5月JournalofHighwayandTransportationResearchandDevelopmentMay2017doi:10．3969/j．issn．1002-0268．2017．05．013桥型布置对独柱墩曲线梁桥抗倾覆性能的影响12121鲁圣弟,熊文,丁旭东,叶见曙,韦国志(1．安徽省交通控股集团有限公司,安徽合肥230088;2．东南大学交通学院,江苏南京210096)摘要:以三跨连续独柱墩曲线梁桥作为基本结构,针对不同桥型布置形式建立有限元模型,利用非线性分析与接触理论考察倾覆过程中结构位移、转角及支
2、座反力的时程变化规律。进而计算抗倾覆稳定安全系数,分析不同桥型布置下的独柱墩梁桥抗倾覆能力及倾覆力学特征,改变桥型布置以对独柱墩倾覆力学行为进行参数分析,并将规范法计算结果与有限元法计算结果进行对比。数值仿真表明:随偏载不断增大,边墩内侧支座反力首先减小直至脱空;反力重新分配后,边墩外侧支座反力增速减缓,中墩单支座反力持续增大,最终达到极限状态。通过参数分析可进一步看出:不同桥型布置形式对这一倾覆过程影响明显,边中跨比越小的独柱墩梁桥,其抗倾覆安全性能越低;如果同时曲线半径较大,则采用规范方法验算时会大大高估其抗倾覆能力,从而降低结构设计的安全性。关键词:桥梁工程;独柱墩;参数分
3、析;抗倾覆;曲线半径;边中跨比;安全系数中图分类号:U442文献标识码:A文章编号:1002-0268(2017)05-0095-07InfluenceofStructureArrangementonAnti-overturnPerformanceofCurvedBeamBridgewithSingle-columnPiers12121LUSheng-di,XIONGWen,DINGXu-dong,YEJian-shu,WEIGuo-zhi(1．AnhuiTransportationHoldingGroupCo．,Ltd．,HefeiAnhui230088,China;2．Sch
4、oolofTransportation,SoutheastUniversity,NanjingJiangsu210096,China)Abstract:Basedonathree-spancontinuouscurvedbeambridgewithsingle-columnpiers,thefiniteelementmodelsofdifferentstructurearrangementsarebuilt．Thechangelawsofdeformation,rotation,andsupportreactionduringtheentireprocessofbridgeove
5、rturnareinvestigatedusingnonlinearanalysisandcontacttheory．Thesafetyfactorfordescribingtheanti-overturnabilityisfurthercalculated,theanti-overturnabilityandthemechanicalcharacteristicsofoverturningofthebridgewithsingle-columnpiersareanalysed．Varyingthestructurearrangement,theparametricstudyfo
6、rthemechanicalcharacteristicsofoverturningofsingle-columnpiersisconducted,andthecalculationresultfromfiniteelementmethodiscomparedtothatbasedontheexistingdesignstandard．Thenumericalsimulationshowsthat(1)alongwithincreasingunbalancedloading,theinnersupportreactionatsidepierwoulddecreaseuntilth
7、ebearingisdisengaged;(2)afterreactionre-distribution,theincreasingoftheoutersupportreactionatsidepierbecomesslow,andthesupportreactionatthesinglesupportofmiddlepierkeepsincreasinguntilreachesitslimitcondition．Basedontheparametricstudy,itisals
