本文探讨了钢筋混凝土受弯构件的开裂机理,并将裂缝宽度分解为三个分项裂缝宽度,即:构件在不考虑粘结应力时产生的裂缝宽度;开裂后混凝土的回缩所产生的裂缝宽度;钢筋与混凝土间的粘结力对裂缝宽度的影响。本文对分项裂缝宽度分别计算后进行叠加,从而建立了统一的矩形截面受弯构件裂缝宽度和刚度的理论计算公式。验算结果表明,上述公式是合理的,所得结果较为满意。 This paper discusses the cracking mechanism of reinforced concrete flexural members, and divides the crack width into three sub-item crack widths, namely: the crack width of the component when the bond stress is not considered; the crack caused by the concrete shrinkage after cracking Width; the effect of bond strength between reinforcing steel and concrete on crack width. In this paper, the calculation of the crack widths for each item is superimposed, and a theoretical calculation formula for the crack width and stiffness of a unitary rectangular section flexural member is established. The verification results show that the above formula is reasonable and the results obtained are satisfactory.