TY - JOUR A2 - Martinelli, Enzo AU - Wang, Lai AU - Chen, Haitao AU - Zhong, Jitao AU - Chen, Huirong AU - Xuan, Wei AU - Mi, Shuai AU - Yang, Hongyan PY - 2018 DA - 2018/02/11 TI - Study on the Bond-Slip Performance of CFSSTs Based on Push-Out Tests SP - 2959827 VL - 2018 AB - To study the interfacial bond-slip performance of concrete-filled square steel tubes (CFSSTs), taking the core concrete strength, slenderness ratio, and width-to-thickness ratio as the influencing factors; 9 specimens were designed with 3 factors and 3 levels for the orthogonal test method. In addition, different from the above 9 specimens, one specimen without rust removal was designed for the purpose of comparison. Based on the bond stress distribution and deformation coordination relationships between the specimens during the push-out tests, a theoretical formula for calculating the relative slip of a CFSST was deduced. The results show that with the increase of load, the relative slip at the loading ends was earlier than that at the free ends of the specimens; the interfacial bond failure and relative slip gradually developed from the two ends towards the centre of the specimens; the increase of the bond stress in the middle part was faster than that at the ends of the specimens. The order of these factors from main to secondary is the presence of rust in the inner wall of the square steel tube, the slenderness ratio, the core concrete strength, and the width-to-thickness ratio. SN - 1687-8434 UR - https://doi.org/10.1155/2018/2959827 DO - 10.1155/2018/2959827 JF - Advances in Materials Science and Engineering PB - Hindawi KW - ER -