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时间:2019-05-13
《大跨度连续刚构柔性拱组合结构受力效应分析》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、桥梁建设2012年第42卷第3期(总第213期)BridgeConstruction,Vo1.42,No.3,2012(TotallyNo.213)19文章编号:1003—4722(2012)03—0019—05大跨度连续刚构柔性拱组合结构受力效应分析谌启发(中铁第四勘察设计院集团有限公司,湖北武汉430063)摘要:为研究大跨度连续刚构柔性拱组合结构受力效应,以宜万铁路宜昌长江大桥为背景,在总结该类结构体系特点的基础上,采用桥梁博士分析软件建立全桥平面有限元模型,对全桥桥面施加竖向均布荷载(二期恒
2、载),分析拱梁内力、竖向荷载及跨中截面弯矩的分配;将该桥与孔跨组成及截面尺寸完全相同的连续刚构桥在恒、活载作用下的结构内力进行对比,分析组合结构的拱梁组合效应。分析结果表明:在竖向均布荷载作用下,连续刚构柔性拱组合结构跨中范围吊杆轴力增加较大;结构跨中截面总弯矩绝大部分已转化为拱肋压力与主梁拉力;与连续刚构相比,活载作用下,连续刚构柔性拱组合结构的主梁弯矩显著减小,结构刚度提高较大,柔性拱作用明显。关键词:铁路桥;组合结构;连续刚构;柔性拱;受力分配;结构效应中图分类号:U448.13文献标志码:A
3、AnalysisofForceEffectofLongSpanHybridStructureofContinuousRigid—FrameandFlexibleArchCHENQi—fa(ChinaRailwaySiyuanSurveyandDesignGroupCo.,Ltd.,Wuhan430063,China)Abstract:Tostudytheforceeffectofthelongspanhybridstructureofcontinuousrigid—frameandflexiblea
4、rch,theYichangChangjiangRiverBridgeonYichang—WanzhouRailwaywascitedasexample.Onthebasisofsummarizationofthecharacteristicsofsuchtypeofthestruc—turesystem,theanalysissoftwareBridgeDoctorwasusedtoestablishtheplanarfiniteelementmodelforthewholebridgeofthe
5、bridge,theverticaluniformload(thesecondphasedeadload)wasappliedtothedeckofthewholebridgeandthedistributionofinternalforces,verticalloadandmidspansectionbendingmomentofthearchandgirderofthebridgewasanalyzed.Thestructuralinternalforcesofthebridgeunderthe
6、actionofstaticanddynamicloadswerecomparedtothoseofacontinuousrigid—-framebridgehavingcompletelythesamespancompositionsandsec—tionaldimensionsandtheeffectofthehybridstructureofthearchandgirderwasanalyzed.Theresultsoftheanalysisdemonstratethatundertheact
7、ionoftheverticaluniformload,theincreaseofthehangeraxialforcesintherangeofthemidspanofthehybridstructureofthecontinuousrigid~frameandflexiblearchisgreat,mostofthetotalbendingmomentofthemidspansectionhasbeentransferredtothecompressionofthearchribsandtoth
8、etensileforceofthemaingird~er.Incomparisontothecontinuousrigid—framebridge,thebendingmomentofthemaingirderofthehybridstructureundertheactionofliveloadisconsiderablyreduced,thestructuralrigidityisgreatlyincreasedandthefunctionoftheflexib
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