Abstract

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Title:: Large Eccentric Compression Behavior of Post-filling Coarse Aggregate Concrete

Author(s):: JIA Jin-qing; YE Hao; ZHOU Jia-yu; LI Lu; State Key Laboratory of Coastal and Offshore Engineering， Dalian University of Technology

Keywords:: post-filling coarse aggregate concrete; mechanical property; large eccentric compression; post-filling ratio of coarse aggregate; failure mode; ultimate bearing capacity; stress-strain curve

Abstract:: 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.