后掺骨料混凝土柱大偏心受压性能

Large Eccentric Compression Behavior of Post-filling Coarse Aggregate Concrete

为研究后掺骨料混凝土柱的大偏心受压性能,对粗骨料后掺率分别为0%,10%,20%,25%,30%的5根后掺骨料钢筋混凝土柱进行了大偏心受压试验,分析了其破坏形态、承载力、延性、混凝土应变、钢筋应变等;利用试验结合公式的方法得到后掺骨料混凝土的应力-应变全曲线。结果表明:后掺骨料混凝土柱在破坏形态、钢筋及混凝土应变趋势、裂缝发展过程等方面与普通混凝土柱相似;在20%骨料后掺率下,柱的极限承载力最大,而在其他后掺率下,柱的极限承载力相对于普通混凝土柱都有所降低;大型有限元分析软件ABAQUS数值模拟结果与试验结果吻合良好;在一定的后掺率下,后掺骨料混凝土柱的受力性能和变形性能均得到了改善。

In order to study the large eccentric compression performance of the post-filling coarse aggregate concrete column,5 tests on the large eccentric compression of reinforced concrete columns were carried out.The post-filling ratios of the coarse aggregate were 0%,10%,20%,25%and 30%,respectively.The failure mode,bearing capacity,ductility,strain of concrete and strain of steel bar were analyzed by the test results.The stress-strain curve of the post-filling coarse aggregate concrete was obtained by the method of combining the experiment with the formula.The results show that the post-filling coarse aggregate concrete columns were similar to the ordinary concrete columns in terms of failure mode,strain trend and crack development process of reinforcement and concrete.The ultimate bearing capacity of the column is the highest with 20% post-filling ratio,while the ultimate bearing capacity of the column is lower than that of the ordinary concrete column with other post-filling ratios.The numerical simulation results of the large-scale finite element analysis software ABAQUS are in good agreement with the experimental results.The mechanical properties and deformation properties of the post-filling coarse aggregate concrete columns are improved under a certain post-filling ratio.