为了对预应力混凝土截面进行准确的抗弯分析,必须考虑两点:一是力的平衡,二是应变协调。在分析中,可以使用混凝土和钢筋的实际应力—应变曲线,也可以进行某种程度的简化,给出一条通用的近似曲线。与此相仿,混凝土的最大应变应以最大弯矩所对应的应变为准,但通常是采用一个固定值(如-0.003)作为近似的最大应变值。 In order to accurately analyze the cross-section of prestressed concrete, two points must be considered: one is the balance of forces and the other is the strain coordination. In the analysis, the actual stress-strain curves of concrete and steel can be used, or some degree of simplification can be given, giving a general approximate curve. Similarly, the maximum strain of concrete should be based on the maximum bending moment corresponding to the strain, but usually uses a fixed value (such as -0.003) as the approximate maximum strain value.