修改混凝土强度等级，运行后生成混凝土应力应变全曲线的应变、应力、损伤因子等参数。该计算程序基于《混凝土结构设计规范》的相应参数(Modify the strength grade of concrete, and generate the parameters of strain, stress and damage factor of the whole stress-strain curve of concrete after operation. The program is based on the corresponding parameters of the code for design of concrete structures)