荆州长江公路大桥主梁高性能混凝土徐变试验

Test on High-Performance Concrete Creep of Main Girder of Jingzhou Yangtze River Highway Bridge

为准确计算高性能混凝土的长期徐变,根据荆州长江公路大桥的建设要求,对两种高性能混凝土施工配合比进行徐变试验,并用优化方法进行了拟合计算,给出了两种配合比混凝土徐变度的计算公式,介绍了相应的混凝土松弛系数计算方法。应用该方法对荆州长江公路大桥主梁混凝土的应力松弛系数进行了计算,为该桥的设计和施工提供了科学的依据。

In order to correctly calculate long-term creep of high-performance concrete when the structure was being designed and constructed, the experimental research on creep of high- performance concrete including two mixture ratios that were designed for the construction was done. Based on the datum of the test, a calculating expression of the concrete creep was presented and the fitting factors in the expression were given respectively for two mixture ratios through optimization calculation. Finally, the calculation method for calculating the concrete relaxation coefficient of Jingzhou Yangtze River Highway Bridge which provided scientific basis for design and construction of the bridge was introduced.