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1、第27卷第5期中國(guó)民航大學(xué)學(xué)報(bào)V01.27No.52009年10月J0URNALOFCIVILAVIATIONUNIVERSITYOFCHINA0etcher2009均布載荷下變形受約束懸臂梁彈性大變形分析曹天捷(中國(guó)民航大學(xué)交通工程學(xué)院,天津3~30)摘要:建立了分析均布載荷作用下受約束懸臂粱的彈性大變形三階段模型。模型的第1階段為懸臂梁變形不受約束的階段:第2階段為懸臂梁自由端和其下面的約束相接觸時(shí)的變形階段,此時(shí),在接觸處有一支反力作用:第3階段為懸臂梁和其下面的約束有一定接觸范圍時(shí)的變形階段,此時(shí)在接觸范圍內(nèi),粱的撓度和轉(zhuǎn)角是固定的。給出了
2、各個(gè)階段彈性大變形梁的邊界條件,提出了各階段求解梁彈性大變形的三重二分法。實(shí)例中,對(duì)于粱在各階段的彈性大變形問題進(jìn)行了分析計(jì)算.并和小變形理論的計(jì)算結(jié)果進(jìn)行了比較。結(jié)果表明,在梁變形的第1階段,小變形理論的相對(duì)誤差隨著初始間隙的增大而迅速增大;在梁變形的第2階段,在給定的初始間隙范圍內(nèi).小變形理論的相對(duì)誤差變化不大;在梁變形的第3階段,小變形理論的相對(duì)誤差隨著接觸范圍的增大也迅速增大。關(guān)鍵詞:懸臂粱;彈性大變形;三階段模型;均布載荷中圖分類號(hào):0343.5文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1674—5590(2009)05—0023—05Analysisto
3、LargeDeflectionsofElasticCantileverBeamwjthConstraintunderUniformlyDistributedLoadCA0帆ie(TransportationEngineeringCbllege,CAUC,Tianjin300300,China)Abstract:Amodelforanalyzingthelargedeflectionofanelasticcantileverbeamwithconstraintunderuniformlydistributedloadwasestablished.In
4、themode1.thedeflectionofthebeamwasdividedintothreestages:thefirstwasacantileverbeamSHbiectedtotheuniformlydistributedlcadwithoutanyconstraint;thesecondwasabeamsubjectedtotheloadwithaconstraintatthefreeend,i.e.thebeamwassubjectedtoanextrareactionatthefreeendbesidestheuniformlyd
5、istributedload;thethirdwasabeamsubjectedtotheuniformlydistributedloadandthereactionwithgivendeflectionandangleofrotationoverapartofthebeam.Theboundaryconditionsofthebeamateverystageweregivenandthethree-foldmethodofbisectionwasusedtosolveforthelargedeflectionofthebeamateverysta
6、ge.Intheexample,thelargedeflectionsoftheelasticbeamateverystagewerecalculatedandtheresultswerecomparedwiththoseobtainedbysmalldeflectiontheory.Itisproventhatatthefirststage,therelativeerrorbythesmalldeflectiontheoryincreasesquicklywiththeincreaseoftheinitialgap;atthesecondstag
7、e,therelativeerrorbythesmalldeflectiontheoryhasafewincreaseonthegiveninitialgap;atthethirdstage,therelativeerrorbythesmalltheoryincreasesquicklywiththeincreaseofcontactregion.Keywords:cantileverbeam;elasticlargedeflection;three—stagemodel;uniformlydistributedload多年來,眾多學(xué)者對(duì)彈性大變形
8、或彈塑性大變形中力作用下簡(jiǎn)單結(jié)構(gòu)的彈性大變形分析¨0_“]。近年來,問題進(jìn)行了大量的研究,如集中力作用下懸臂梁的彈微機(jī)電系