Study on bond-slip characteristics and damage constitutive model for interface between corroded I-shaped steel and concrete
Wang Mingnian1,2 Zhang Yiteng1,2 Yu Li1,2 Liu Kerui1,2 Yang Henghong1,2
1. Key Laboratory of Transportation Tunnel Engineering of the Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China;
2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
Abstract：Subjected to high chloride ion content in the service environment, corrosion of I-shaped steel in primary support of subsea tunnel is inevitable, which leads to the bond degradation of the interface between I-shaped steel and concrete and furthermore seriously affects the durability of subsea tunnel support system. The main objective of this work was to study the effect of corrosion on the bond-slip behavior of the interface between I-shaped steel and concrete. Firstly, the accelerated corrosion test and push out test were carried out on the steel reinforced concrete(SRC) specimens, and the failure mode and bond-slip curves(τ-S) were obtained. On this basis, the bond-slip mechanical properties and energy evolution during the process were analyzed. The experimental results show that:① The failure mode of the specimen is mainly splitting failure, and the bond-slip curve(τ-S) is composed of three stages: the linear ascending stage, the curved ascending stage, and the steep descending stage;② Both the peak bond strength and the corresponding peak slippage show a decreasing trend with the increase of corrosion rate;③ With the increase of corrosion rate, the elastic energy ratio decreases linearly, while the dissipated energy ratio increases linearly, indicating that the greater the corrosion rate of I-shaped steel is, the more serious internal damage I-shaped steel shall have and the lower the energy storage efficiency of the interface shall be. Finally, the bond-slip degradation constitutive model of corroded I-shaped steel-concrete interface is obtained by using the damage statistical theory of Weibull distribution. Since the influence of corrosion rate on the τ-S curve is taken into account, and the model prediction agrees well with the test curve so that it can be applied to the bond-slip study of corroded I-shaped steel-concrete interface.
王明年 张艺腾 于丽 刘轲瑞 杨恒洪. 锈蚀工字形型钢与混凝土黏结滑移特性及损伤本构模型研究[J]. 土木工程学报, 2022, 55(1): 64-74.
Wang Mingnian Zhang Yiteng Yu Li Liu Kerui Yang Henghong. Study on bond-slip characteristics and damage constitutive model for interface between corroded I-shaped steel and concrete. 土木工程学报, 2022, 55(1): 64-74.
