Behavior of steel tube columns filled with steel-fiber-reinforced self-stressing recycled aggregate concrete under axial compression
Behavior of steel tube columns filled with steel-fiber-reinforced self-stressing recycled aggregate concrete under axial compression
复制标题
钢纤维自应力再生骨料混凝土钢管柱轴压性能
DOI：
10.1016/j.tws.2019.106521
复制
发表时间：
2020-04-01
影响因子：
6.4
通讯作者：
Yi, Si
中科院分区：
文献类型：
--
作者：
Liu, Zhenzhen;Lu, Yiyan;Yi, Si
面对每年产生的大量建筑垃圾，再生粗骨料的循环利用势在必行。本研究采用钢纤维再生混凝土制作钢管混凝土柱，以提高再生混凝土的利用率。对54根钢纤维自应力钢管再生混凝土柱的轴压性能进行了试验研究。试验变量包括钢纤维掺量、自应力、RCA质量替代率、混凝土强度等级、钢管壁厚。试验结果表明，随着RCA含量的增加，混凝土强度变差。但是，在钢管三向应力作用下，RCA的负面影响被削弱。通过添加适量的钢纤维可以提高SSRCFST柱的延性。自应力能显著提高钢管混凝土柱的极限承载力和刚度。提出了钢管混凝土柱的极限承载力计算公式，计算结果与试验结果吻合较好。
Faced with the large annual output of construction and demolition waste, cyclic utilization of recycled coarse aggregate (RCA) is inevitable. This study uses steel-fiber-reinforced recycled aggregate concrete (RAC) in the manufacture of concrete-filled steel tube columns, to improve the utilization of RAC. A comprehensive study of the axial behavior of 54 steel-fiber-reinforced self-stressing recycled aggregate concrete-filled steel tube (SSRCFST) columns was conducted. The variables in the experiments included the steel fiber content, self-stress, quality replacement rate of RCA, concrete strength grade, and steel tube thickness. The experimental results show that a poor concrete strength is obtained with increasing RCA content. However, under tri-axial stress in the steel tube, the negative influence of RCA is weakened. An enhancement of the ductility of SSRCFST columns can be achieved by adding a moderate amount of steel fiber. Self-stress can significantly improve the ultimate capacity and stiffness of SSRCFST columns. Moreover, design equations for the ultimate capacity of SSRCFST columns are proposed, and the predictions agree satisfactorily with the experimental results.