受静载荷梁的内力及变位计算公式

1、受静载荷梁的内力及变位计算公式简？?图符？当？意？?义？?及？?正？负?#?例？?定P集中载荷q均布载荷R支座反力，作用方向向上者为正Q剪力，对邻近截面所产生的力矩沿顺时针方向者为正M弯矩，使截面上部受压，下部受拉者为正0转角，顺时针方向旋转者为正f挠度，向下变位者为正E弹性模量I截面的轴惯性矩a、b、c见各栏图中所示简？?图支座反力、支座反力矩区段剪？?力弯？铁巨挠？?度转？彷Rb=PMb=-P1Qx=-PMx=-PxRb=PMB=-PbACQx=0Mx=0CBQx=-PMx=-P(x-a)Rb=nPRb=qlQx=-qxRb=qcMb=-qcbACQx=0Mx=0CDQx=-q(x-d)D

2、BQx=-qcMx=-qc(x-a)ACCBRb=0Mb=Mx=-MQx=0Mx=-Mw值见表；a、b、c见各栏中所示简？啊支座反力、支座反力矩区段剪？?力弯？铁巨挠？?度转？加PRa=Rb='ACCB竺Ra=?PaRb='ACCBMx=Pa(1-)MC=Mmax=Ra=Rb=PACQx=PMx=PxCDQx=0Mx=Mmax=PaACCDDB若a>c：当n为奇数：当n为偶数：当n为奇数：当n为偶数:当n为奇数：当n为偶数：当n为奇数：当n为偶数:Ra=Rb=qaACQx=q(a-x)CDQx=0Ra=Rb=2ACCDACCDDBRa=RB=qcACQx=qcMx=qcx

3、CDDEQx=0Mx=Mmax=qcb当x=ACACCB若a>b,Mx=M(1-)Mmax=MMo=M2-Mi若Mi>M2：Mmax=MiACMx=MEMc左=MaCBMx=-Mt；M=-M3W值见表；a、b、c见各栏图中所示简？?图支座反力、区段剪？?力弯？现挠？?度车t?t支座反力矩ACCB当x=:ACQx=RaMx=RaxCBQx=Ra-PMx=Rax-P(x-a)ACQx=RaMx=RaxCDQx=Ra-PMx=Rax-P(x-a)DBQx=Ra-2PMx=Rax-P(2x-l)MC=Mmax=RAa当x=:Rb=qc-RaMB=RAl-qcbACQx=RaMx=RaxCD

4、Qx=RA-q(x-d)DBQx=RA-qcMx=Rax-qc(x-a)当x=:Mmax=当x=:当x=:Mmax=当x=:AC当x=:Mmax=当x=:Ma=Mmax=MACQx=RaCBMC右=Mmax=M+Mc左W值见表；a、b、c见各栏图中所示简？?啊支座反力、支座反力矩区段剪？?力弯？?矩挠？?度转？彷ACIX=反弯点在4至X=及4处Ra=Rb=PACQx=PMx=Pl(&cora)CDQx=0ACQx=RaMx=Ma+RaxCBQx=Ra-PMx=Ma+Rax-P(x-a)工二若a>b,当左十卜:当n为奇数：当n为偶数:当n为奇数：当n为偶数:当n为奇数：当n为偶数：

5、当n为奇数：当n为偶数：反弯点在x=及*=处Ra=Rb=qaACCDQx=0ACCDRb=qc=RaACQx=RaMx=Ma+RaxCDQx=RA-q(x-d)DBQx=Ra-qcMx=Ma+Rax-qc(x-a)当x=:Mmax=当x=:ACACCDACQx=RaMx=Ma+RaxCBMx=Ma+Rax+M5.带悬臂的梁简？?？图支座反力、支座反力矩区段剪？?力弯？现挠？?度转？加Ra=P(1+NRb=-P入MA=-PmACQx=-PMx=-Px当x=m+时：ABQx=Ra-PMx=-Px+P(1+；)(x-m)Ra=Rb=PMa=MB=-PmACQx=-PMx=-Px当x=m+时：ABQx=0Mx=-PmACABQx=-qxQx=Ra-qxACQx=-qx当xm+时：ABRa=Rb=qmACQx=-qx当x=m+时：ABQx=0MA=-PmACQx=-PMx=-Px当工=阴4-BJ3ABMx = - Px+Ra( x- m)Ma= MACABQx= -qxQx= Ra- qx当m=时:Mb=0AC Qx= - qxAB Qx= Ra- qxAC Qx= 0Mx= MABMx=-RA(x-m)+M6.双跨、三跨梁OAMo=Mb=0DE=AC=FG武=