大部分预应力混凝土结构是首先根据其允许应力或强度进行设计和确定构件尺寸的。如果采用了一个合理的设计方法,并且满足了规范要求的允许应力、抗弯强度、剪力和扭矩,则这个设计很可能不需要任何修改而最后定下来。可是,在结构的使用过程中,会有一些增加的情况,例如与长期反拱或挠度有关的情况可能控制设计,而在预制构件的结点和联结处更是如此。 Most prestressed concrete structures are first designed and dimensioned according to their allowable stress or strength. If a reasonable design methodology is used and the permissible stress, flexural strength, shear and torque of the specification are met, it is likely that the design will eventually be finalized without any modification. However, there are some additional situations that may arise during the use of the structure, for example, in the case of long-term arching or deflection, which may control the design, especially at the junctures and junctions of prefabricated structures.