弯幽应力( Stresses in Beams) 第五拿弯曲应力( Stresses in beams) >55-1引言( Introduction) D52纯弯曲时的正应力 (Normal stresses in pure beams D55-3横力弯曲时的正应力( Normal stresses in transverse bending 55-4梁的切应力及强度条件( Shear stresses in beams and strength condition) 5-5提高梁强度的主要措施( Measures to strengthen the strength of beams)(Stresses in Beams) §5-1 引言 ( Introduction) §5-2 纯弯曲时的正应力 (Normal stresses in pure beams ) §5-3 横力弯曲时的正应力(Normal stresses in transverse bending ) §5-4 梁的切应力及强度条件 (Shear stresses in beams and strength condition) 第五章 弯曲应力(Stresses in beams) §5-5 提高梁强度的主要措施（Measures to strengthen the strength of beams)