本文在试验的基础上分析了钢筋混凝土有腹筋梁在弯、剪、扭联合作用下的工作性能,并将各种扭剪比试件的斜拉开裂承载力的无量纲相关关系归纳为一直线;而将极限承载能力的无量纲相关关系归纳为1/4圆曲线,并证明了极限承载能力由混凝土贡献和钢筋贡献两部份组成,且钢筋的贡献与箍筋的配筋率成直线关系 Based on the experiments, this paper analyzes the working performance of reinforced concrete beams with web reinforcement under the joint action of bending, shearing and torsion, and sums up the non-dimensional correlations of the tensile-cracking capacity of various torsional shear ratios as straight lines. The dimensionless correlation of the ultimate bearing capacity is summed up as a 1/4-circle curve, and it is proved that the ultimate bearing capacity is composed of two parts: the concrete contribution and the reinforcement contribution, and the contribution of the reinforcement is linear with the reinforcement ratio of stirrups.