双向受弯钢筋混凝土简支梁抗剪性能试验研究

Experimental Study on Shear Strength of Simply Supported R.C. Beams under Biaxial Bending

根据对正交试验结果和文献试验资料的研究 ,分析了次生扭矩产生的原因及其对双向受弯钢筋混凝土简支梁抗剪强度的影响 ,结合次生扭矩探讨了荷载斜弯角、截面高宽比、剪跨比、混凝土强度等级、纵筋和箍筋配筋率等因素对有、无腹筋梁抗剪性能的影响。得出了双向受弯构件抗剪强度随着混凝土强度的提高、纵筋和箍筋配筋率的增大而提高 ,随着剪跨比、荷载斜弯角。

Based on the orthogonal experiment results and the previous data, the cause leading to the secondary torsion and its influence upon the shear strength of simply supported R.C. beams under biaxial bending are analyzed. The main factors affecting the shear strength of R.C. beams with or without web reinforcement are discussed. They are load inclination, depth width ratio of the cross section, the ratio of shear span to depth, concrete strength and the ratios of the longitudinal reinforcement and the lateral reinforcement. It is concluded that the shear strength increases with the enhancement of concrete strength, the ratios of both longitudinal and lateral reinforcement. However, the shear strength decreases with the enhancement of load inclination, depth width ratio of the cross section and the ratio of shear span to depth.