Journal of South China University of Technology (Natural Science Edition) ›› 2020, Vol. 48 ›› Issue (9): 20-33.doi: 10.12141/j.issn.1000-565X.190904

• Architecture & Civil Engineering • Previous Articles     Next Articles

Interface Bond Behavior of High Strength Concrete Filled Square Steel Tube Subjected to High Temperature and Subsequent Water Cooling

CHEN Zongping1,2 ZHOU Ji1 CHEN Jianjia1 ZHOU Xingyu1   

  1. 1． College of Civil Engineering and Architecture，Guangxi University，Nanning 530004，Guangxi，China;2． MOE Key Laboratory of Disaster Prevention and Structural Safety，Guangxi University，Nanning 530004，Guangxi，China
  • Received:2019-12-16 Revised:2020-04-01 Online:2020-09-25 Published:2020-09-01
  • Contact: 陈宗平 (1975-)，男，博士，教授，主要从事钢 － 混凝土组合结构、再生混凝土结构、海洋及近海混凝土结构研究。 E-mail:zpchen@gxu.edu.cn
  • About author:陈宗平 (1975-)，男，博士，教授，主要从事钢 － 混凝土组合结构、再生混凝土结构、海洋及近海混凝土结构研究。
  • Supported by:
    Supported by the National Natural Science Foundation of China (51268004)，the Key Projects of Guangxi Natu-ral Science Foundation (2016GXNSFDA380032) and the Special Fund Project for “Bagui”Scholars ( ［2019］ No. 79)

PDF

220

Abstract: To study the interface bond behavior of high strength concrete filled square steel tube (HSST) subjected to high temperature and subsequent water cooling，22 specimens were designed to carry out static push-out tests in-cluding 18 water cooling specimens and 4 natural cooling specimens，and the effects of concrete strength，maximum temperature，anchorage length，constant temperature and cooling mode were mainly considered． The interface fai-lure mechanism of the HSST subjected to high temperature and subsequent water cooling was revealed through ex-periments，and the influence of various parameters on the bond properties was analyzed． In addition，the formulas for calculating ultimate bond strength and residual bond strength of HSST subjected to high temperature and subse-quent 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 high temperature and subsequent water cooling can be divided into two kinds of typical curves． After high temperature and subsequent water cooling，the bond strength of the specimen increases first and then decreases with the increase of the maximum temperature，increases with the increase of the concrete strength，and decreases with the increase of the anchor length． Compared with that at holding time for 60 min，the bond strength of the specimen at holding time for 90 min rebounds． Compared with the natural cooling specimens，the ul-timate bond strength，residual bond strength and bond shear 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 agrees well with the experimental results．

Key words: square steel tube, high strength concrete, high temperature and subsequent water cooling, bond strength, slipping behavior

CLC Number: