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 (12): 1762-1769.

• • 上一篇    下一篇

高温喷水冷却后方与圆钢管混凝土柱轴压性能及损伤研究

苏赞耀1，陈宗平2   

  1. （1. 广西大学 土木建筑工程学院，广西 南宁 530004；2. 广西大学 工程防灾与结构安全教育部重点试验室，广西 南宁530004)
  • 出版日期:2021-12-15 发布日期:2021-12-15
  • 通讯作者: 陈宗平（1975-），男，广西大学教授。
  • 作者简介:苏赞耀（1997-），男，广西大学土木建筑工程学院硕士研究生，主要从事钢与混凝土组合结构研究，广西省南宁市西乡塘区大学东路100号水科所，530004。
  • 基金资助:
    国家自然科学基金项目（51578163）；广西科技基地与人才专项（桂科AD21075031）；广西八桂学者专项研究项目（[2019]79 号）

Study on axial compression properties and damage of concrete filled square or circular steel tube columns after being subjected to elevated-temperatures spray cooling

SU Zan-yao1， CHEN Zong-ping2   

  1. （1. College of Civil Engineering and Architecture, Guangxi University, Guangxi Nanning 530004, China; 2. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Guangxi Nanning 530004, China)
  • Online:2021-12-15 Published:2021-12-15

摘要： 为研究高温喷水冷却后方与圆钢管混凝土柱的力学性能及损伤演化差异，以截面形式、高温温度、混凝土强度、冷却方式为变量设计了方、圆钢管混凝土柱各14根，对其高温喷水冷却处理后进行轴压试验，对比方与圆钢管混凝土柱峰值应力、初始刚度、延性系数、耗能系数等力学性能指标。确定试件损伤程度，对比方与圆钢管试件损伤随温度的演化规律，以及剩余承载力与损伤的关系。结果表明：高温喷水冷却后，圆钢管试件峰值应力、延性、耗能能力更大；随温度升高，圆钢管试件剩余承载力退化更慢，而方钢管试件延性以及耗能能力提高更快；相对于圆钢管试件，喷水冷却对方钢管试件延性、耗能的影响更为明显；随温度升高，方钢管试件损伤发展更快，且剩余承载力随损伤发展下降更迅速。

关键词: 高温, 喷水冷却, 截面形式, 轴压性能, 损伤分析

Abstract: To investigate the difference of the mechanical behavior and damage evolution of concrete filled square and circular steel tubular columns(CFSST、CFCST) after high temperature and water spray cooling, 14 concrete filled square steel tubular columns and 14 concrete filled circular steel tubular columns were designed with different parameters as sectional form, high temperature, concrete strength, and cooling methods. The specimens after water spray cooling were tested under uniaxial compression, and the mechanical properties including peak stress, initial rigidity, ductility coefficient and energy dissipation coefficient of CFSST and CFCST were compared and analyzed. Determine the degree of damage of the specimen, compare the relationship between damage and temperature, and the evolution of residual bearing capacity with damage. The results indicated that: The peak stress, ductility, and energy dissipation of CFCST specimens are greater. As the temperature increases, the bearing capacity of CFCST specimens decreases more slowly, but the ductility and the energy dissipation capacity of CFSST specimens increases faster. Relative to CFCST specimens, the cooling method had more significantly influence on the ductility and energy consumption capacity of CFSST specimens. As the temperature increases, the damage of CFSST specimens increases faster, and the residual bearing capacity of CFSST specimens decreases linearly as the increase of the damage.

Key words: high temperature, spray cooling, cross-section form, axial compression properties, damage analysis