按照Trost-Bazant理论,用“按龄期调整的有效模量”代替混凝土的弹性模量,可以导出混凝土结构由于收缩徐变所引起的应力增量与应交增量之间的拟线性关系,从而可以利用解弹性结构的方法来解混凝土结构的徐变问题。对于分阶段施工的预应力混凝土节段式桥梁,利用有限单元法,进行逐步计算,可将结构在各个阶段的所有节点力和变位的增量,连同各批力筋的应力损 According to Trost-Bazant theory, the elastic modulus of concrete can be replaced by “effective modulus adjusted according to age”, and the quasi-linear relationship between stress increment and increment due to shrinkage and creep of concrete structure can be deduced. Thus, the creep problem of concrete structure can be solved by the method of solving the elastic structure. For the prestressed concrete segmental bridge constructed in stages, the finite element method is used to carry out the step-by-step calculation. The increment of all nodal forces and displacements of the structure at each stage can be calculated,