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ID:36455563
大小:2.91 MB
页数:6页
时间:2019-05-10
《基于扩展有限元法的部分斜拉桥索鞍抗裂性分析》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2015年第45卷第1期(总第230期)68BridgeConstruction,Vo1.45,No.1,2015(TotallyNo.230)文章编号:1003—4722(2015)01—0068—06基于扩展有限元法的部分斜拉桥索鞍抗裂性分析林诗枫,黄侨,胡雪峰,胡世翔(1.东南大学交通学院,江苏南京210096;2.吉林省公路勘测设计院,吉林长春130021)摘要:为研究部分斜拉桥混凝土索鞍的应力分布规律、优化索鞍的钢筋配置,以宁江松花江特大桥为背景进行分析。采用MIDASCivil建立全桥空间杆系模型分析桥梁整体受力
2、特性,再基于ABAQUS建立索塔及索鞍实体单元模型,分别采用扩展有限元方法和混凝土塑性损伤本构模型对混凝土索鞍进行数值分析。结果表明:①部分斜拉桥混凝土索鞍在斜拉索索力作用下将产生贯穿孔道的劈裂裂缝;建议增大钢筋直径或者加密水平钢筋间距;②在斜拉索作用下索鞍结构外形突变处产生应力集中,主压应力值超过C50混凝土的抗压强度标准值,建议增设倒角或者圆角;③扩展有限元方法可以较好地预测裂缝的发生与扩展,与混凝土非线性分析的结果基本一致,但在裂缝处的应力场计算有所差异。关键词:部分斜拉桥;混凝土索塔;索鞍;抗裂性;非线性分析;扩展有限元法中
3、图分类号:U448.27;U443.38文献标志码:AAnalysisofCrackResistanceofSaddleforExtradosedBridgeBasedonExtendedFiniteElementMethodLINShi—feng,HUANGQiao,HUXue—feng,HUShi—xiang(1.SchoolofTransportation,SoutheastUniversity,Naniing210096,China;2.JilinProvincialHighwaySurveyandDesignInstitu
4、te,Changchun130021,China)Abstract:TOstudythestressdistributionlawoftheconcretesaddleinpylonofextradosedbridgeandtooptimizethereinforcementlayoutforthesaddle,theNingjiangSonghuaRiverBridgewascitedasanexampleandwasanalyzed.BymeansoftheMIDASCivil.thespatiallinkmodelforthe
5、wholebridgeofthebridgewasestablishedandtheglobalmechanicalbehaviorofthebridgewasanalyzed.FurtherbymeansoftheABAQUS,thesolidelementmodelsforthepylonandsaddlewereestablishedandthenumericalanalysisofthesaddlewasconducted。respectivelyusingtheextendedfiniteelementmethodandt
6、heconcreteplasticdamageconstitutivemode1.Theresultsoftheanalysisdemonstratethat①undertheactionofthestaycableforces,theconcretesaddleoftheextradosedbridgemayproducesplittingcracksthroughthestaycableductsanditisproposedthediametersofthereinforcementforthesaddleshouldbeen
7、largedorthespacingdis—tancesofthehorizonta1reinforcementshouldbedensified;②undertheactionofthestaycableforces,attheabruptjunctionofthesaddlestructure,thestressconcentrationmayoccur,theprincipalcompressivestressvalueswillexceedthestandardvaluesofcompressivestrengthofthe
8、C50concreteanditiSproposedthattheroundedcornerortheroundcornerattheunctionshouldbeaddedand③theextendedfiniteelementme
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