Abstract：The bond behavior of interface for concrete filled steel tube (CFST) is the basis for coordination deformation and load bearing between the steel tube and the concrete. In order to investigate the bond failure and critical influence factors of average bond strength for CFST interface, CFST specimens were designed and push-out slip tests were conducted under constant high temperature, in which design parameters, such as temperature, ratio of length to diameter and ratio of diameter to thickness were considered. Temperature-time and load-relative slip curves of the specimens were gained. Test results show that constant temperature has significant influence on the average bond strength of CFST specimens when the temperature is between 20℃ and 900℃. Average bond strength decreases with the temperature at first, then increases, and decreases at last with the highest reduction rate of 90%. While, the average bond strength decreases with the ratio of length to diameter of CFST specimens, with the highest reduction rate of 50%. It is shown that the ratio of diameter to thickness has minor influence on the average bond strength.
陈俊 薛媛媛 谭清华 吴金梁 . 恒高温下钢管混凝土界面黏结性能试验研究[J]. 土木工程学报, 2018, 51(3): 11-18.
Chen Jun Xue Yuanyuan Tan Qinghua Wu Jinliang . Experimental study on bond behavior of interface for concrete-filled steel tube under constant high temperature. 土木工程学报, 2018, 51(3): 11-18.
