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为研究再生粗骨料取代率对圆钢管型钢再生混凝土组合短柱轴压性能的影响,设计制作了5个组合短柱试件。通过轴心受压试验,观察组合短柱试件的受力全过程及破坏形态,获取了试件荷载-位移及荷载-应变曲线,分析再生粗骨料取代率对组合短柱承载力、刚度、延性、损伤及耗能等各项力学性能指标的影响。结果表明:在轴向荷载作用下,型钢首先发生屈服,组合短柱最终由于钢管外鼓屈曲而破坏;随着再生粗骨料取代率的增加,试件承载力逐渐降低,刚度退化较缓慢,损伤度呈现递增的趋势;延性及耗能能力增大,试件表现出较好的变形能力。综合分析建议再生粗骨料取代率取为70%。
In order to study the influence of the recycled coarse aggregate substitution ratio on the axial compression properties of CFRP stub columns, five combinations of short column specimens were designed and manufactured. Through the axial compression test, the whole process and the failure mode of the short column specimens were observed, and the load-displacement and load-strain curves of the specimens were obtained. The effects of the recycled coarse aggregate substitution ratio on the bearing capacity, , Ductility, damage and energy consumption and other mechanical properties of the index. The results show that, under the axial load, the profile steel first yield, and the composite short columns eventually collapse due to buckling of the steel drum. With the increase of the replacement rate of recycled coarse aggregate, the bearing capacity of the profile gradually decreases and the stiffness degenerates slowly, The damage degree showed an increasing trend; the ductility and energy dissipation capacity increased, and the specimens showed better deformation ability. A comprehensive analysis suggests that the replacement rate of recycled coarse aggregate should be 70%.