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Experimental Study on Axial Compressive Behavior of Reinforced Recycled Aggregate Concrete-Filled Steel Tube Short Column
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摘要: 为探明再生粗骨料100%取代率下配筋对圆形钢管再生混凝土(RACFST)短柱受力性能的改善作用,进行了以不同纵筋配筋为参数的配筋RACFST(R-RACFST)的轴压试验。对比分析破坏模式、荷载-位移曲线、刚度、屈强比和组合效应等关键力学特性后发现:钢管与钢筋骨架的双重约束作用能有效改善核心再生混凝土的脆性,明显提升峰值荷载和塑性变形能力,有效减缓刚度退化;就屈强比与组合效应而言,并非配筋率越大越好,在一定配筋率范围内时,可使构件各部分组合效应更好,并能充分发挥钢筋的性能。由此得出结论:配置少量钢筋既可保证构件在再生骨料取代率100%时的各项力学性能,又可达到再生骨料100%利用的目的;推荐R-RACFST合理配筋率范围为0.84%~3.9%;修正的承载力计算式稳定可靠。Abstract: To investigate the improving effect of reinforcement on the loading performance of recycled concrete-filled circular steel tube (RACFST) columns with 100% replacement-ratio of recycled coarse aggregate, axial compression tests of reinforced RACFST (R-RACFST) with varying longitudinal reinforcement ratio were conducted. The comparative analysis results on key mechanical indices, such as failure mode, load-displacement curve, stiffness, yield-to-strength ratio and the composite effect, showed that the reinforcement could effectively mitigate the brittleness of recycled concrete core, and improved the peak load and the after-peak plastic deformation capacity, and relieved the degradation in stiffness; as far as the yield-to-strength ratio and composite effect are concerned, larger ratio of reinforcement not necessarily brought larger increase in performance, namely in a proper range of ratio, reinforcement would bring better composite effect, and could better utilize the reinforcement. As results, configuring a little amount of reinforcement would put the R-RACFST member with 100% replacement-ratio of recycled coarse aggregate into better mechanical performance, and hereby make it possible to use recycled coarse aggregate 100%; a proper range of reinforcement ratio was recommended as 0.84%-3.9%; the proposed equation for predicting the ultimate load bearing capacity of R-RACFST was stable and reliable.
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