规范专题组的试验表明,二阶段浇筑、二阶段受力的钢筋混凝土迭合构件极限承载能力与条件相同的钢筋混凝土整浇构件相当,而其延性指标却大于整浇构件。本文根据试验结果,给出受弯钢筋混凝土迭合构件延性系数β的计算方法。试验表明,“附加拉力”及剪切变形对迭合构件截面延性计算影响很小,可以忽略;迭合前、后截面应变分布基本符合平截面假定,故截面延性系 The experiment of the norm group indicated that the ultimate bearing capacity of reinforced concrete members with two-stage pouring and two-stage loading is the same as that of reinforced concrete concrete casting components with the same conditions, but its ductility index is larger than that of the whole casting members. Based on the test results, this paper gives the calculation method of the ductility coefficient β of the laminated reinforced concrete member. The tests show that “additional tension” and shear deformation have little influence on the calculation of the ductility of the laminated members, and can be ignored; the strain distributions before and after lamination basically conform to the flat section assumptions, so the ductility of the section