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针对徐变对大跨径预应力混凝土箱梁长期挠度的影响,基于空间分析程序,分析了徐变时间对大跨径预应力混凝土箱梁顶板和底板有效预应力的影响。结果表明:预应力损失在跨中附近大于桥墩附近,即有从跨中向桥墩减小的趋势;后期预应力损失实验室与工地徐变计算影响比较接近,且与AASHTO规范有相似的变化规律;预应力损失值随时间而不断增大,且在成桥3年内的损失值占成桥后损失值的绝大部分。
In view of the influence of creep on long-term deflection of long-span prestressed concrete box girder, the influence of creep time on the effective prestressing of roof and floor of long-span prestressed concrete box girder is analyzed based on the spatial analysis program. The results show that the prestress loss tends to be larger near the midspan than near the piers, that is to say, there is a tendency to decrease from midspan to piers. The impact of late prestress loss laboratory and site creep calculation are similar and have similar variation rules with AASHTO The value of prestress loss increases with time, and the value of the loss within 3 years after the completion of the bridge account for the vast majority of the loss value.