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分析了钢绞线网-复合砂浆加固钢筋混凝土梁的荷载-挠度曲线,研究了加固层与本体梁界面的粘结机理。将钢筋混凝土梁的受力性能分为未裂阶段、裂缝阶段和破坏阶段,在平截面假定的基础上,建立了高强钢绞线网-复合砂浆加固梁的截面弯矩-跨中挠度分析模型。采用换算截面法对加固梁在集中荷载作用下的抗弯性能进行全过程受力分析,并通过10根加固梁的试验数据对模型进行验证。分析结果表明:截面屈服弯矩和极限弯矩试验值与模型计算值的平均比值分别为1.027、1.094,屈服跨中挠度和极限跨中挠度试验值与模型计算值的平均比值分别为1.286、0.918,因此,截面弯矩-跨中挠度模型可行。
The load-deflection curve of the reinforced concrete beam strengthened with steel wire mesh-composite mortar is analyzed and the bonding mechanism between the reinforcing layer and the body beam is studied. The mechanical behavior of RC beams is divided into uncracked stage, fracture stage and failure stage. Based on the assumption of flat section, the analysis model of moment-span midspan deflection of RC beams strengthened with high strength steel wire mesh-composite mortar . The full-process mechanical analysis of the bending behavior of the reinforced beam under the action of concentrated load is carried out by using the modified section method. The experimental data of 10 reinforced beams are used to verify the model. The results show that the average ratios of the yield stress and the ultimate bending moment to the calculated values of the model are 1.027 and 1.094, respectively, and the average ratios of the experimental values of mid-span deflection and ultimate span and mid-deflection are 1.286 and 0.918, respectively Therefore, the cross-section moment-span mid-deflection model is feasible.