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时间:2019-05-11
《基于Timoshenko梁的分阶段成形结构平衡方程》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5期(总第234期)24BridgeConstruction,Vo1.45,No.5,2015(TotallyNo.234)文章编号:1003—4722(2015)05—0024—06基于Timoshenko梁的分阶段成形结构平衡方程许磊平,秦顺全,苑仁安(1.西南交通大学土木工程学院,四川成都610031;2.中铁大桥勘测设计院集团有限公司,湖北武汉430056)摘要:为研究剪切变形对分阶段成形结构的影响,对Timoshenko梁进行单元分析,推导单元的形函数,建立单元盼截面曲率、剪切应变与单元位移的关系。选取单元无应力状态为势能计算的起点,利用最小势能原理,
2、建立包含单元无应力状态量的分阶段成形的Timoshenko梁结构平衡方程。与欧拉梁相比,增加了单元无应力剪切角作为Timoshenko梁的无应力状态量。编写基于Timoshenko梁的分阶段成形结构计算程序,进行数值分析,结果表明,具有一定的结构体系和外荷载的Timoshenko梁,只要保证各单元的无应力状态量一定,则结构的最终状态是确定的,与施工成形过程无关。关键词:桥梁工程;分阶段成形结构;无应力剪切角;Timoshenko梁;无应力状态量中图分类号:U441文献标志码:AEquilibriumEquationforStructureFormedinStagesBasedonTimos
3、henkoBeamXULei-ping~.QINShun—quan~.YUANRen—an'。(1.SchoolofCivilEngineering,SouthwestJiaotongUniversity,Chengdu610031,China;2.ChinaRailwayMajorBridgeReconnaissance8LDesignGroupCo.,Ltd.,Wuhan430056,China)Abstract:Tostudytheinfluencesofthesheardeformationonthestructureformedinstages。theelementsOftheT
4、imoshenkobeamwereanalyzed,theshapefunctionsoftheelementswerede—rivedandtherelationshipbetweenthesectionalcurvature,shearstrainanddisplacementoftheele—mentswasestablished.Theunstressedstateoftheelementswasselectedastheinitialpointforcalculationofthepotentialenergyandtheprincipleoftheminimumpotentia
5、lenergywasusedtoestablishtheequilibriumequationthatineludedtheunstressedstateamountsoftheelementsforthestructureformedinstagesbasedontheTimoshenkobeam.ComparedtotheEulerbeam,theunstressedshearanglesoftheelementswereaddedandwereusedastheunstressedstateamountsoftheTimoshenkobeam.Thecomputationprogra
6、mforthestructureformedinstagesbasedontheTimoshenkobeamwascompiledandthenumericalanalysiswasimplemented.TheresultsshowthatfortheTimoshenkobeamhavingcertainstructuralsystemandexternalloads,aslongastheunstressedstateamountsofthedifferentelementsarekeptcertain,thefinalstateofthestruc—tureisdefiniteand
7、iSirrelevanttotheformationprocessintheconstruction.Keywords:bridgeengineering;structureformedinstages;unstressedshearangle;Timosh—enkobeam;unstressedstateamount.收稿日期:2015一O1—2O基金项目:国家科技支撑计划(2012BAG05B02)Projectof
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