（1 四川大学新能源与低碳技术研究院， 成都 610065；2 四川大学深地科学与工程教育部重点实验室， 成都 610065； 3 四川大学建筑与环境学院， 成都  610065）

［摘要］针对高温煅烧后的再生混凝土进行荷载特性研究，设计了三种再生骨料取代率（0%，50%和100%）的中空夹层钢管再生混凝土短柱，研究了高温后钢管再生混凝土短柱及其加固后的力学性能，比较了截面形式、再生骨料取代率以及玄武岩纤维对其承载力、应变和位移的影响。结果表明，截面形式对承载力的影响最大。最后，利用再生骨料取代率、温度对其抗压强度的影响关系，尝试建立中空夹层钢管再生混凝土轴压强度承载力关于截面形式、约束系数、温度、再生骨料取代率以及外加固纤维布约束面积等变量的相关关系式，并通过试验数据加以验证。

［关键词］再生混凝土； 力学性能； 承载力； 钢管混凝土短柱

中图分类号：TU398，TV335文献标识码：A文章编号：1002-848X(2020)06-0081-05

Research and analysis on the reinforcement performance of recycled concrete filled  hollow interlayer steel  tubular short columns after high temperature

He Yuanyuan1,2, Dong Jiangfeng2,3, Wang Qingyuan1,3

(1 Institute of New Energy and Low-carbon Technology, Sichuan University, Chengdu 610065, China; 2 Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, China;  3 College of Architecture and Environment, Sichuan University, Chengdu 610065, China)

Abstract:According to the load characteristics of recycled concrete after calcined at high temperature, three kinds of recycled concrete filled hollow interlayer steel tubular short columns with replacement rate of recycled  aggregate (0%, 50% and 100%) were designed. The mechanical properties of  recycled concrete  filled hollow interlayer steel tubular short column and its reinforced concrete column after high temperature were studied, and the effects of section form, replacement rate of recycled aggregate and basalt fiber on its bearing capacity, strain and displacement were compared. The results show that the section form has the greatest influence on the bearing capacity. Finally, the influence of replacement rate of recycled aggregate  and temperature on the compressive strength were used to attempts to establish the correlation expressions of the axial compressive strength bearing capacity of hollow interlayer steel tubular recycled concrete, according to parameters such as   section form, constraint coefficient, temperature, replacement rate of recycled aggregate and constraint area of CFRP, which was verified using the experimental data.

Keywords:recycled concrete; mechanical property; bearing capacity; concrete filled steel tubular column

*国家自然科学基金项目（51408382），教育部创新团队滚动支持项目（IRT_14R37）。

作者简介：何媛媛，硕士研究生，Email: hyy2836@163.com。