Abstract: In order to research the mechanical performance of the prestressed continuous girder after damage under the extreme condition of the carrying capability and the common use，the time-varieties of concrete，including shrinking and creeping， were taken into consideration，on the basis of material，cross-section and components． The comprehensive analysis on the global performance evolution of the structure was carried out by changing the damage time and damage amount． And the displacement evolution in the span，the relative relationship evolution between the anti-bending carrying capability and loading response，the stress evolution of the controlled cross-section and the evolution rule of the prestressed value of the actual bridge structure in lifetime are obtained．

Key words: prestressed concrete, global structure, time-variety, lifetime, evolution

摘要： 为了研究预应力混凝土连续梁耐久性损伤后在承载能力极限状态和正常使用极限状态下的力学性能，在材 料、截面和构件的研究基础上，考虑收缩、徐变等混凝土材料的时变性，通过采用改变损伤时间和损伤量的方式对结 构整体性能演变进行综合分析，得到了实桥结构在寿命期的跨中位移演变、抗弯承载力和荷载效应相对关系演变、 控制截面混凝土应力演变及预应力筋应力值演变规律。

关键词: 预应力混凝土, 整体结构, 时变性, 寿命期, 演变