第一节梁抗剪工作时的应力状态和破坏形态钢筋混凝土梁中,由于正应力σ和剪应力τ的共同作用,在梁内出现了主拉应力σ_(zl)和主压应力σ_(za)。由于混凝土的抗拉强度远低于抗剪强度,并且,沿梁高的不同部位,主拉应力的作用方向也不同,例如在中和轴处的作用方向与中和轴成45°角。从而引起了受剪(实际上是 The stress state and failure mode of the first section of the beam during shearing work In the reinforced concrete beam, due to the joint action of the normal stress σ and the shear stress τ, the main tensile stress σ_(zl) and the main compressive stress σ_(za) appear in the beam. ). Since the tensile strength of concrete is much lower than the shear strength, and along different parts of the beam height, the direction of action of the principal tensile stress is also different, for example, the direction of action at the neutralization axis is at an angle of 45° with the neutral axis. Which caused shear (actually