高性能混凝土收缩徐变对悬臂构件性能影响的试验研究

为掌握苏通大桥连续刚构桥所用高性能混凝土收缩徐变对桥梁结构施工期变形、截面应力以及预应力损失的影响,在高性能混凝土收缩徐变模型试验研究的基础上,开展了自然环境下高性能混凝土双悬臂构件的长期性能试验研究。试验结果表明:高性能混凝土可有效地减小收缩徐变,降低预应力损失,使变形处于可控范围之内。应用高性能混凝土收缩徐变模式对悬臂构件的长期性能进行了理论分析,试验结果与理论分析值吻合较好。

EXPERIMENTAL STUDY ON BEHAVIOR OF CANTILEVER GIRDER INDUCED BY SHRINKAGE AND CREEP OF HIGH-PERFORMANCE CONCRETE

In order to find out how the high-performance concrete(HPC)used in Sutong continuous rigid-frame bridge affects the long-term behavior of bridge,such as long-term deformation,section stress and prestress loss,experimental study on the long-term behavior of the HPC dual cantilever girder is developed under natural environments,which based on the model test of HPC shrinkage and creep.The results show that the HPC can effectively lower the shrinkage and creep,and also reduce the prestress loss,which made the structure deformation be in control.By using finite element software Midas,long-term performance of the cantilever girder is analyzed.The analytic results agree well with the test data.