混合裂纹对钢板加固混凝土梁安全性的影响

摘要

The paper adopts the numerical calculation to analyze the debonding of the concrete beam strengthened by steel plates caused by the mixed mode fracture,proves by the research result that the ends of the mixed mode fracture having larger stress concentration are the main reason for the debonding of the steel plate and the simultaneous process of the concrete cracks and the debonding at the steel plates in the loading procedure,and indicates the debonding occurs from the mixed mode fracture to the mid-span and there is no debonding at the parts between the cracks and the ends.%采用数值计算的方法对混凝土混合裂缝引起钢板加固混凝土梁的脱粘行为进行了详细的分析,研究结果表明,混合裂缝的端部存在比较大的应力集中,是导致钢板脱粘的主要原因,混凝土开裂和钢板脱粘在整个加载过程中同时发生;脱粘从混合裂缝开始向跨中进行,而在裂缝和两端之间的部分没有脱粘发生。