高强混凝土指数型收缩徐变预测模型及工程应用
柯敏勇，刘海祥，陈灿明，陈 松
(南京水利科学研究院，江苏南京210029)
摘 要：收缩徐变是导致大跨度预应力混凝土箱梁桥长期变形的重要因素，现有桥梁长期变
形分析中通常采用CEB-FIP 90模型，计算结果会出现较大偏差。为减小预应力混凝土箱梁桥长
期变形的计算误差，以某三跨预应力混凝土连续箱梁桥为背景，对该桥相同配比的高强混凝土进行
了标准徐变试验，将实测数据拟合得到指数型收缩徐变模型，并根据该桥混凝土构件实际尺寸效
应、湿度效应、钢筋配筋率和持荷年限对徐变系数进行修正。由此计算得到该桥的长期变形与实测
数据吻合较好，验证了指数型收缩徐变模型比现有徐变模型具有更高的预测精度。
关键词：预应力混凝土结构；连续梁桥；变形；收缩徐变
中图分类号：U448．35 文献标志码：A
Prediction M odel of Index Type Shrinkage and Creep for
High-·Strength Concrete and Its Engineering Application
KE M in—yong ，LIU H ai—xiang，CHEN Can。ming ，CH EN Song
(Nanjing Hydraulic Research Institute，Nanjing 210029，China)
Abstract：The shrinkage and creep is an important factor causing long—term deformation of
long span prestressed concrete(PC)box girder bridges．In the current analysis of the long—term
deformation of the bridges，the CEB-FIP 90 model is usually employed and the errors of calcula—
tion by the m odel are great．To minim ize the errors of the calculation，a three—span PC continu—
OUS box girder bridge was cited as an example and the standard creep tests for the high—strength
concrete having the same mix proportioning with that of the bridge were m ade．The measurem ent
data were fitted，the index type shrinkage and creep model was obtained and the creep coefficients
were modified in accordance with the actual dimension effect，humidity effect，reinforcement rati—
OS and load holding years of concrete components of the bridge．The long—term deformation of the
bridge calculated in accordance with the model is well agreeable with the measured deformation，
verifying that the model has even higher prediction precision as compared to that of other existing
shrinkage and creep models．
Key words：prestressed concrete structure；continuous girder bridge；deformation；shrinkage
and creep

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