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 ›› 2020, Vol. 39 ›› Issue (6): 739-742.

• •    下一篇

喷水冷却火灾后钢管混凝土界面粘结性能研究

谢旺军，陈宗平，周济
  

  1. 1.广西交通职业技术学院，广西 南宁 530023; 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
  • 收稿日期:2020-02-15 出版日期:2020-06-15 发布日期:2020-06-15
  • 通讯作者: 陈宗平(1975-)，男，广西玉林人,广西大学土木建筑工程学院教授，博士生导师,博士。
  • 作者简介:谢旺军（1985-），男，甘肃秦安人，广西交通职业技术学院讲师，工程师，工程硕士，主要从事钢管混凝土组合结构、工程防灾减灾等研究，广西壮族自治区南宁市园湖北路 12 号，530023。
  • 基金资助:
    国家自然科学基金资助项目(51578163) ;“八桂学者”专项经费资助项目（桂政发 2019（79））；2018 年度广西高校中青年教师基础能力提升项目（2018KY1024）

Study on interfacial bond behavior of concrete-filled steel tube after fire and water cooling

XIE Wang-jun1.2, CHEN Zong-ping2.3, ZHOU Ji2   

  1. (1. Guangxi Transport Vocational and Technical College,Guangxi Nanning 530023, 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)
  • Received:2020-02-15 Online:2020-06-15 Published:2020-06-15

摘要： 为研究高温喷水冷却后钢管混凝土界面粘结性能，考虑混凝土强度、锚固长度、冷却方式、最高温度等变化参数，完成23 个试件在高温喷水冷却后的推出试验。观察了冷却后试件的表观变化与试验中的破坏形态，获取了荷载-滑移曲线及特征点参数，分析了界面粘结强度的影响因素，提出了界面粘结强度表达式及粘结滑移本构方程。研究表明：随历经温度升高，界面粘结强度先增后减；粘结强度与锚固长度成反比，温度越高越明显；喷水冷却后试件的粘结强度较自然冷却低，且随历经温度的升高降幅更大。

关键词: 火灾, 高温试验, 圆钢管混凝土, 喷水冷却, 粘结性能, 本构方程

Abstract: In order to reveal the interfacial bond behavior between a circle steel tube and concrete after exposure to elevated temperatures and water cooling, a total of 23 concrete-filled circle steel tube specimens subjected to high temperatures and water cooling were designed for push out test, by considering parameters such as concrete strength grade, anchorage length, cooling method and maximum temperature. The apparent change after cooling and the failure mode during loading were observed respectively. The load-slip curves and characteristic parameters were obtained. Factors affecting the interfacial bond strength were analyzed. The bond strength expression and bond- slip constitutive equation were proposed. The results showed that the interfacial bond strength increases first and then decreases with the increase of the maximum temperature; The bond strength is inversely proportional to the anchorage length, and the higher the maximum temperature is, the more obvious the relationship is; The bond strength of the specimens subjected to water-cooling is lower than that subjected to natural cooling, and the higher the maximum temperature is, the more significant the difference is.

Key words: fire；high temperature test, concrete- filled circle steel tube, water cooling, bond behavior, constitutive equation

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