钢筋再生混凝土柱的承压性能及强度计算

为了研究钢筋再生混凝土柱的承压性能及其强度计算方法，以有限元软件ABAQUS分析为主要研究手段，结合6个试件的实测数据，并拓展了36个试件的数值模拟分析，综合探讨了再生粗骨料取代率、体积配箍率、柱截面纵筋配筋率、长细比以及相对偏心距等变化参数对钢筋再生混凝土柱承压性能的影响规律，分别研究了钢筋再生混凝土轴心受压柱和偏心受压柱的极限承载力计算方法，并提出实用设计公式。研究结果表明：随着再生粗骨料取代率的增大，钢筋再生混凝土柱的受压承载力呈现波动性变化，但其变化幅度在15%以内；随着体积配箍率的增大，其极限承载力有小幅提高；随着截面纵筋配筋率的增大而有明显提高；而随着相对偏心距的增大，其极限承载力则明显降低；在一定范围内，随着长细比的增大，极限承载力显著变小。提出考虑取代率影响系数的钢筋再生混凝土柱极限承载力计算方法，计算结果与试验结果吻合较好。

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.