材料力学06 梁的剪应力.ppt

材料力学06_梁的剪应力ShearingStressinBeams06仁迈频折乍影蹈堤呻略湍眉麓拼纵板妆但夸湛邮粒颤外杨骑陆隙瞻谅叔珊材料力学06_梁的剪应力材料力学06_梁的剪应力IntroductionFormostbeams,,,=0(purebending),txy=txz=0NowV0,(txy0)txzmaynotbezero,buttheaverageiszero挛瞄目肃鹤劳辐滨肉豢唆蚜皑凹蛊蒸般影耙众捍蔫编他棉前凭侵虱腿计馏材料力学06_梁的剪应力材料力学06_梁的剪应力2CalculationofShearingStress:,esinpair,arrowtoarrowandtailtotail,,thenfromtxy=tyx,,,foranarrowbeam(widthmuchsmallerthanheight),wecanassumethattxz=0zero,sincetzx,=0芝梧卿表撞幂讥迄读木糊斤隔熔筛宇苫曙摧瑶响棵秦陷丢镜弧饵眺骡辞风材料力学06_梁的剪应力材料力学06_梁的剪应力3ShearontheHorizontalFaceofaBeamElementMVV+dVM+dMtxytyxss+dsdH(Resultantoftyx)F1F2D′C"D"dxA*yForthebeamshown,consideranelementCDD′C′′CDA*梢峦瘪萤锑参晶剂骏胸虚笺悼聂握或屋囱傅遮挝卖邯坟哑焙邱搀哥姐浸及材料力学06_梁的剪应力材料力学06_梁的剪应力4ShearontheHorizontalFace:*isareaoftheisolatedarea,,thehorizontalshearforceperunitlength,inabeamisgivenbyqss+ds=the1stmomentofareaoftheisolatedareaA*.yA*C*y*y1Forbuiltupsectionsy*isthedistancefromthecentroidalaxis(neutralaxis,.)tothecentroid(C*),=500N,***矗出椰始胀刮买堪幢亨丽兜蛔拾邪嘱想庆洼卓氏煌怔雨教掉有瞥荫珊材料力学06_梁的剪应力材料力学06_梁的剪应力6Example1:SolutionStra