( Stresses in Beams) ( Stresses in Beams) Chapter5 Stresses in beamsMechanics of Materials ( Stresses in Beams) ( Stresses in Beams)回顾与比较内力 应力FAyFSM目录 ( Stresses in Beams) ( Stresses in Beams) 51 51 引言引言 ( Introduction)( Introduction) 5252 纯弯曲时的正应力纯弯曲时的正应力 (Normal stresses in pure beams )(Normal stresses in pure beams ) 5353 横力弯曲时的正应力横力弯曲时的正应力(Normal stresses (Normal stresses in transverse bending )in transverse bending ) 5454 梁的切应力及强度条件梁的切应力及强度条件 (Shear (Shear stresses in beams and strength co