钢筋再生混凝土柱受压承载力试验研究

为了研究钢筋再生混凝土柱的受压性能,设计6个试件进行轴心受压和偏心受压加载试验,考虑再生粗骨料取代率、相对偏心距、配箍率三个变化参数。通过试验观察试件受力破坏过程及形态,获取截面应力分布、变形和极限承载力等重要参数;并分析各变化参数对再生混凝土柱承载性能的影响规律。结果表明:钢筋再生混凝土柱受力破坏过程及形态与普通钢筋混凝土柱相似,均表现为混凝土的压碎;偏心距对试件的极限承载力影响明显,随着相对偏心距的增大,试件的极限承载力逐渐减小,而再生粗骨料取代率对其承载力的影响不显著;采用普通钢筋混凝土的强度计算方法计算钢筋再生混凝土柱轴心受压强度时,试验值比计算值小,偏于不安全,而计算偏心受压强度时,试验值比计算值大。

EXPERIMENTAL STUDY ON MECHANICAL BEHAVIOUR OF REINFORCED RECYCLED COARSE AGGREGATE CONCRETE COLUMNS

In order to research the mechanical performers of reinforced recycled concrete compression columns,six reinforced recycled concrete columns were designed for axial and eccentric compression experiment. This experiment involved the replacement rate of recycled coarse aggregate,relative eccentricity and stirrup ratio etc. The whole destructive process and failure mode of reinforced recycled concrete columns were observed through the experiment. The cross-sectional stress distribution,deformation,ultimate bearing capacity and other important data were obtained. And the effecting law of each changing parameter on the recycled concrete columns' ultimate bearing capacity was analyzed. The results showed that the axial,eccentric compression destructive process and failure mode of reinforced concrete columns were similar to those of ordinary reinforced concrete columns,both showed as crush of concrete. Influence on specimens' ultimate bearing capacity of relative eccentricity was evident,the ultimate bearing capacity of columns was decreasing with the increase of relative eccentricity,and the replacement rate of recycled coarse aggregate had little effect on the bearing capacity. When using the calculation methods of the ordinary reinforced concrete columns to calculate the reinforced recycled concrete columns, for axial compression strength, the experimental data were smaller than the theoretical data,which was not safe; for eccentric compression strength,the experimental data were bigger than the theoretical data.