材料力学 课件（厦门大学）第五章 弯曲内力 internal force in bending

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1、第五章弯曲内力Beam：structurememberswithabendingdeformationasthemajordeformationthelongitudinalaxisofbeamSymmetricaxisofthecrosssectionLongitudinalplaneofsymmetryofthebeamFig.4-3(p273)supportsofbeamsimplebeamcantileverbeampinsupportpinsupportrollersupportfixedsupportfixe

2、dsupport(clampedsupport)beamwithanoverhangpinsupportrollersupportstaticallyindeterminatebeams4.3，p276-283SignConvention:+-QQclockwiseQQdxdxlowerpartelongatedEx：4-1、4-2、4-3(p278)4.5,p288-294•EtEquatiionsdescribingvariationsofshearforcesandbendingmomentsalonglocati

3、onsofsections•DiagramsdescribingvariationsofshearforcesandbendingmomentsalonglocationsofsectionsEx：•asinglepointforce（p289)•uniformlydistributedforcesuniformlydistributedforces（p291)•multippplepointforces（pp)292)q:upperpositive4.4,p284-288balancesofelementbalance

4、sofelementpointforces：p287balancesofelementbalancesofelementconcentratedbendingmomentsconcentratedbendingmoments：p288