1.Chongqing Jiaotong University;2.School of Civil Engineering,Chongqing Jiaotong University;3.School of Civil Engineering, Chongqing Jiaotong University
This paper was supported by the Major National Natural Science Foundation for Research Instrument Development of China (Grant No. 11627802).This paper was supported by the National Natural Science Foundation of China (Grant No. 51478071).This paper was supported by the Construction Technology Project of Ministry of Transport (Grant No. 2015318814190).This paper was supported by the Key project of foundation and frontier research of Chongqing (Grant No. cstc2015jcyjBX0022).
The interface performance between steel plate and concrete is the key to strengthened concrete structure. In this paper, there were 27 specimens carried out for steel plate bonded concrete under hydrothermal environment. And accelerated hydrothermal aging was respectively conducted in 5 days, 10 days and 15 days. Then the double- shear test was performed to obtain the ultimate load, strain distribution and relationship of load-displacement during the shear failure process on steel plate-concrete interface. After long term temperature and humidity coupling, the durability of the steel plate-concrete interface was studied. Considering the analysis of bond failure mode, loading process and the relative displacement evolution on bonding interface, the expression of shear stress and slip was proposed, which was related to temperature and humidity. Finally, the bond-slip constitutive model was established in consideration of the temperature and humidity. The numerical simulation results were in good agreement with the experimental results. The results of the paper provide reference for the design of the concrete structure with bonded steel plate and the durability theory.