配筋圆钢管再生混凝土短柱轴压试验研究  

Experimental Study on Axial Compressive Behavior of Reinforced Recycled Aggregate Concrete-Filled Steel Tube Short Column ALIFUJIANG Xiamuxi AYIDENIGULI Duman

作　　者：阿里甫江·夏木西[1] 阿依德尼古丽·都曼 柳才坚 LIU Caijian(College of Architecture and Civil Engineering,Xinjiang University,Urumqi 830017,China)

机构地区：[1]新疆大学建筑工程学院,乌鲁木齐830017

出　　处：《工业建筑》2023年第5期28-34,共7页Industrial Construction

基　　金：国家自然科学基金项目(51968068)。

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。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.

关 键 词：配筋钢管再生混凝土 100%取代率 纵筋配筋率 试验研究 承载力 

分 类 号：TU398.9[建筑科学—结构工程]