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ID:51467458
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时间:2020-03-25
《钢管腹杆—混凝土K形组合节点试验及仿真分析.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、桥梁建设2017年第47卷第5期(总第246期)BridgeConstruction,V01.47,No.5,2017(TotallyNo.246)47文章编号:1003—4722(2017)05—0047—06钢管腹杆一混凝土K形组合节点试验及仿真分析端茂军1,刘钊1,张建东2,刘朵2(1.东南大学土木工程学院,江苏南京210096;2.江苏省交通科学研究院股份有限公司,江苏南京211112)摘要:为研究钢桁腹一混凝土组合梁中钢管腹杆与混凝土弦杆K形组合节点的传剪机理,开展K形节点区抗剪试验及节点区键销钢筋、连接螺栓的直剪试验,得到K形节点区的破坏形态,并通过试
2、验提出的钢筋及螺栓直剪的多折线荷载~位移本构模型,进行K形节点区的精细化三维非线性仿真分析。研究结果表明,K形节点区的竖向剪力来自于相邻节间弦杆的轴力差,键销钢筋及连接螺栓的直剪破坏是节点区受剪失效的主要原因,其抗剪承栽力主要由键销钢筋及连接螺栓提供;所建立的K形节点区非线性仿真模型能够较好地反映节点区的破坏形态,极限承栽力及荷载~位移曲线与试验结果吻合良好。关键词:组合梁;钢管腹杆;K形节点;传剪机理;抗剪试验;直剪试验;非线性仿真分析中图分类号:U448.216;U443.4文献标志码:AExperimentandSimulationAnalysisofK--
3、ShapeCompositeJointofSteelTubeWebMembersandRCChordDUANMao-junl,LIUZha01,ZHANGJian—don92,LIUDuo2(1.SchoolofCivilEngineering,SoutheastUniversity,Nanjing210096,China;2.JiangsuTransportationResearchInstituteCo.,Ltd.,Nanjing211112,China)Abstract:TostudythesheartransfermechanismoftheK—shape
4、compositejointofthesteeltubewebmembersandreinforcedconcrete(RC)chordinthesteeltrusswebandconcreteslabcompositegirder,thesheartestoftheK—shapecompositejointareaandthedirectsheartestofthepincouplingreinforcementandconnectingboltsintheareawerecarriedoutandthefailuremodesoftheareawereobta
5、ined.Basedonthetests,themulti—linearload~displacementconstitutivemodelsforthedirectshearofthereinforcementandconnectingboltswereproposedandtherefinedthree—dimensionalnonlinearsimulationanalysisoftheareawasconducted.TheresultsofthetestsandanalysisdemonstratethattheverticalshearoftheK—s
6、hapecompositejointareaoriginatesfromtheaxialforcedifferencesofthechordsoftheadjacenttrusspanels.Thedirectshearfailureofthepincouplingreinforcementandconnectingboltsisthemajorcauseleadingtotheshearfailureoftheareaandtheshearcapacityoftheareaisprovidedmainlybythereinforcementandconnecti
7、ngbolts.Thenonlinearsimulationmodelsfortheareaestablishedinthispapercanwellreflectthefailuremodesoftheareaandtheultimatebearingcapacityandtheload~displacementcurvesareingoodagreementwiththoseofthetests.Keywords:compositegirder;steeltubewebmember;K—shapejoint;sheartransfermecha—nism;sh
8、earte
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