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对高强不锈钢绞线网-渗透性聚合物砂浆加固的9根矩形钢筋混凝土梁进行抗剪试验研究,分析加固方式、固定钢绞线网的螺栓数量、间距、二次受力等因素对加固构件刚度和裂缝的影响。研究结果表明:该加固工艺能够显著提高混凝土梁的刚度,延迟斜裂缝的出现,减小斜裂缝宽度;多而密的固定螺栓会对原梁刚度造成极大削弱;U形加固直接在梁顶产生层间裂缝而发展为加固层剥离,环包加固却在梁上下边缘处形成水平临界裂缝,而后发展为加固层剥离破坏;持载程度高的梁刚度提高幅度小,斜裂缝发展快,但修复破坏梁效果显著;在试验研究和理论分析基础上,提出考虑剪切变形的加固梁挠度计算公式和斜裂缝宽度计算公式。
The shear tests of nine rectangular RC beams reinforced with high strength stainless steel wire mesh and permeable polymer mortar were carried out. The reinforcement methods, the number of bolts, the spacing and the secondary stress of the fixed strand network were analyzed. Stiffness and crack effects. The results show that: the reinforcement process can significantly increase the rigidity of concrete beams, delay the emergence of oblique cracks, reduce the width of oblique cracks; more and more dense fixed bolts will greatly reduce the stiffness of the original beam; U-shaped reinforcement directly in the top of the beam The interlayer cracks develop and become the peeling of the reinforcing layer. The annular reinforcement results in the formation of horizontal critical cracks at the upper and lower edges of the beam, and then develops into the peeling of the reinforcing layer. The increase of the stiffness of the beam with high load and the rapid development of oblique cracks The effect of repairing the damaged beam is remarkable. Based on the experimental research and theoretical analysis, the calculation formula of deflection of reinforced beam and the formula of diagonal crack width considering shear deformation are proposed.