RESEARCH ON BEARING CAPACITY AND STRENGTH CALCULATION OF REINFORCED RECYCLED COARSE AGGREGATE CONCRETE COLUMNS

In order to reveal the bearing capacity of reinforced recycled coarse aggregate concrete columns and its ultimate strength calculation method, extensive analysis of numerical simulation using ABAQUS software is conducted. Based on the test results of 6 reinforced recycled coarse aggregate concrete columns, 36 computational models are built to conduct systematical finite-element simulation and to explore the calculating method of axial or eccentric compression capacity. The variable parameters of the models are: recycled coarse aggregate replacement percentage, stirrup ratio, longitudinal reinforcement ratio, slenderness ratio and relative eccentricity. The results show that the numerical simulation results agree well with the test ones. With the increase of recycled coarse aggregate replacement percentage and stirrup ratio, the ultimate bearing capacity slightly increases. With the increase of longitudinal reinforcement ratio, the capacity increases remarkably. With the increase of relative eccentricity, the capacity decreases remarkably. Within a certain range, the bearing capacity decreases sharply with the growth of slenderness ratio. Calculation formulas of reinforced recycled concrete columns ultimate capacity are proposed. The calculated results agree well with the test results.