钢筋混凝土梁斜裂缝倾角理论与试验分析

斜裂缝倾角为45°的假定给精确分析箍筋和FRP加固钢筋混凝土梁的抗剪作用带来一定的误差.为此,从理论上研究了斜裂缝倾角的发展规律,发现影响斜裂缝倾角的主要因素是剪跨比;并通过国内外的35根试验梁,验证了斜裂缝倾角与剪跨比的线性关系.通过对数据统计分析给出了计算斜裂缝倾角的简单可靠、适用性较强的表达式,为钢筋混凝土梁的抗剪分析和工程实际应用提供了有意义的依据.

Theoretical and experimental analyses of critical shear angle of RC beam

Analyses of critical shear failure of normal reinforced concrete (RC) beams and fiber reinforced polymer (FRP)-strengthened concrete beams are commonly based on the assumption that the critical shear angle is 45°. However, this assumption may unavoidably bring some errors in the shear analysis. Therefore, an analytical study is carried out and the results indicate that the critical shear angle mainly depends on the shear span to effective depth ratio. Simultaneously, a series of 35 experimental beams are collected to further validate the analytical results. Based on these experimental data, a simple and credible expression of evaluating the critical shear angle is finally given out.