主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
消防科学与技术

消防科学与技术 ›› 2021, Vol. 40 ›› Issue (8): 1150-1154.

• • 上一篇    下一篇

高温喷水冷却后混凝土柱性能对比分析

陆燕青1，许瑞天2，莫琳琳2，陈宗平2,3   

  1. 1.广西大学 行健文理学院，广西 南宁 530004； 2.广西大学 土木建筑工程学院，广西 南宁 530004；3.广西大学 工程防灾与结构安全教育部重点实验室，广西 南宁 530004

  • 出版日期:2021-08-15 发布日期:2021-03-15
  • 通讯作者: 陈宗平（1975-），男，广西大学土木工程学院教授，博士生导师。
  • 作者简介:陆燕青（1974-），男，广西大学行健文理学院高级工程师，硕士，主要从事工程防灾减灾、工程结构设计等方面的研究，广西壮族自治区南宁市西乡塘区大学东路100号，530004。
  • 基金资助:

    国家自然科学基金项目（51578163）；广西八桂学者专项研究项目（[2019]79号）

Comparative analysis on performance of concrete columns after high temperature water cooling

LU Yan-qing1, XU Rui-tian2,  MO Lin-lin2, CHEN Zong-ping2,3   

  1. 1. Xingjian College of Science and Liberal Arts, Guangxi University, Guangxi Nanning 530004, China; 2. College of Civil Engineering and Architecture, Guangxi University, Guangxi Nanning 530004, China; 3. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Guangxi Nanning 530004, China
  • Online:2021-08-15 Published:2021-03-15

摘要： 为对比分析高温喷水冷却后3种约束再生混凝土柱（即螺旋筋再生混凝土柱、方钢管再生混凝土柱和圆钢管再生混凝土柱）的力学性能退化规律，以截面类型、历经温度和再生粗骨料取代率为变化参数，共设计了36个试件，进行高温喷水冷却后的轴心受压加载试验，观察了试件破坏全过程，并对比分析高温喷水冷却后这3种约束再生混凝土柱的极限承载力、初始轴压刚度和延性的差异。结果表明：随历经最高温度的增大，各种约束再生混凝土柱的极限承载力、初始轴压刚度和延性均出现了不同程度的退化，其中圆钢管再生混凝土柱退化幅度最小且较为稳定，方钢管再生混凝土柱的延性随温度升高出现了正增长；随再生粗骨料取代率的增加，方钢管和圆钢管试件的极限承载力、初始轴压刚度和延性呈现先减小后增大的变化趋势，其波动范围为-15.3%~2.3%，而螺旋筋约束混凝土柱试件受取代率影响则相对较小，其变化范围为0~12.9%。

关键词: 再生混凝土, 截面形式, 高温, 喷水冷却, 轴压性能

Abstract:

In order to compare and analyze the degradation law of mechanical properties of three kinds of confined recycled concrete columns (spiral reinforced recycled concrete column, square steel tube recycled concrete column and circular steel tube recycled concrete column) after high-temperature water spraying cooling, 36 specimens were designed to carry out axial compression loading test after high-temperature water spraying cooling with section type, temperature and recycled coarse aggregate replacement rate as variable parameters. The whole failure process of the specimens was observed, and the differences of ultimate bearing capacity, initial axial compression stiffness and ductility of the three kinds of confined recycled concrete columns after high temperature water cooling were compared and analyzed. The results show that: with the increase of the maximum temperature, the ultimate bearing capacity, initial axial compression stiffness and ductility of recycled concrete columns with various constraints are degraded to varying degrees, and the degradation range of circular steel tube recycled concrete columns is the smallest and more stable. The ductility of recycled concrete-filled square steel tubular columns increases with the increase of temperature. With the increase of replacement rate of recycled coarse aggregate, the ultimate bearing capacity, initial axial compression stiffness and ductility of square steel tube and round steel tube specimens first decrease and then increase, and the fluctuation range is -15.3%~2.3%, while the influence of replacement rate on spiral reinforced concrete column specimens is relatively small, and the variation range is 0~12.9%.


Key words:  , recycled concrete, section form, high temperature, spray cooling, axial compression performance