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采用“三维实体-弹簧-壳”有限元模型对承受拉弯组合荷载的CFRP加固钢板表面裂纹应力强度因子(SIF)进行计算,并研究了拉弯应力比、裂纹特征及粘贴层数等因素对加固效果的影响。研究结果表明:采用CFRP加固,可显著降低钢板半椭圆表面裂纹前缘的应力强度因子;最大名义拉应力相同的条件时,CFRP的加固效果随拉弯应力比的增大而降低;裂纹特征对加固效果影响较大,对于裂纹面面积较大及形状扁平的裂纹CFRP会取得更好的加固效果;增加CFRP层数能在一定程度上提升加固效果,但加固效果与其粘贴层数并不成正比,需考虑胶层传递荷载能力以免造成材料的浪费。
The stress intensity factor (SIF) of the surface crack of the CFRP-strengthened steel plate subjected to the combined bending and bending loads was calculated by using the “3D solid-spring-shell” finite element model and the tensile stress ratio, crack characteristics, Influence of Factors on Reinforcement Effect. The results show that the CFRP reinforcement can significantly reduce the stress intensity factor of the semi-elliptical surface crack front. When the maximum nominal tensile stress is the same, the reinforcement effect of CFRP decreases with the increase of tensile stress ratio. The effect of reinforcement is greater, and the cracked CFRP with larger crack area and flat shape will get better reinforcement effect. Increasing the number of CFRP layers can enhance the reinforcement effect to a certain extent, but the reinforcement effect is not proportional to the number of layers to be glued. Need to consider the plastic layer to transmit load capacity to avoid material waste.