Experimental Study on Interface Bond Behavior of High Strength Concrete Filled Circle Steel Tube after Elevated Temperatures and Water Cooling

被引：0
|
作者：
Chen Z. [1 ,2 ]
Zhou J. [1 ]
Chen J. [1 ]
Ban M. [1 ]
机构：
[1] College of Civil Engineering and Architecture, Guangxi University, Nanning
[2] Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning
来源：
Hunan Daxue Xuebao/Journal of Hunan University Natural Sciences | 2021年 / 48卷 / 03期
基金：
中国国家自然科学基金;
关键词：
After elevated temperatures and water cooling; Bond strength; Circle steel tube; High strength concrete; Slip behavior;
D O I：
10.16339/j.cnki.hdxbzkb.2021.03.008
中图分类号：
学科分类号：
摘要：
In order to study the interface bond behavior of high strength concrete filled circle steel tube (HCST) after elevated temperatures and water cooling, 22 specimens were designed to be subjected to static push-out tests, and the effects of concrete strength, maximum temperature, bonded length, constant temperature and cooling mode were mainly considered. The interface failure mechanism of the HCST after elevated temperatures and water cooling was revealed through experiments, the influence of various parameters on the bond properties was analyzed, and the formulas for calculating the ultimate bond strength and residual bond strength of HSST after elevated temperatures and water cooling were put forward. The results show that the load-slip curves of the loading end and the free end of the specimen subjected to elevated temperatures and water cooling are basically similar, and they can be divided into three typical curves. The longitudinal stress-strain distribution on the outer surface of the steel tube in the test is exponential. After elevated temperatures and water cooling, the bond strength of specimens changes little with the increase of concrete strength, and is inversely proportional to the bonded length. It is basically stable after the constant temperature reaching 60 minutes. With the increase of the maximum temperature, the ultimate bond strength first increases, then decreases, and finally increases, and the residual bond strength first increases and then decreases. Compared with the natural cooling specimens, the ultimate bond strength, residual bond strength and shear bond stiffness of the specimens subjected to water cooling are smaller, and the interface energy dissipation capacity is larger. The results calculated by the calculation formula of the bond strength proposed in this paper agree well with the experimental values. © 2021, Editorial Department of Journal of Hunan University. All right reserved.
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页码：75 / 87
页数：12
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