Method for calculating cracking load of fiber cloth-reinforced single-reinforcement rectangular section beam

The invention relates to a method for calculating a cracking load of a fiber cloth-reinforced single-reinforcement rectangular section beam. The method comprises the steps of (1), building a mechanical model through a material stress-strain relationship, and calculating the height of a compression zone; (2), considering a layer number of basalt fiber cloth and an adhesive layer, and calculating a theoretical cracking bending moment through the mechanical model obtained in the step (1); (3), considering a constraint effect of the basalt fiber cloth and a U-shaped hoop, and correcting the theoretical cracking bending moment obtained in the step (2); and (4), calculating a cracking load value Pcr during third point loading. 本发明涉及种纤维布加固单筋矩形截面梁的开裂荷载计算方法，其包括(1)、通过材料应力-应变关系，建立力学模型，计算受压区高度；(2)、考虑玄武岩纤维布层数和胶层，通过步骤(1)得到的力学模型计算理论开裂弯矩；(3)、考虑玄武岩纤维布及U型箍的约束作用，对步骤(2)得到的理论开裂弯矩进行修正；(4)计算三分点加载时的开裂荷载值P。