Analysis Of Bond Performance Between Steel Reinforcing Bars And Concrete After Temperature

In reinforced concrete structure,the bonding performance between steel reinforced rebars and concrete is very complex process,which will changes with the change of external environment and load conditions,the stress between steel reinforced bars and concrete must always keep the normal delivery status to keep the coordination deformation and the normal stress status.The material performance will change in some degree after heating and cooling,which would make damage and performance degradation of mechanical properties in the bonding interface,thus the stiffness,force status of structures and the development of the interface crack will change in some degree.The existing research results show that the change of each part of the structure of the internal stress state,mechanical properties and other factors will lead to the change of bonding performance in the process of heating and cooling.In recent years,the damage and degradation of bonding properties between concrete and steel reinforced rebars after elevated temperatures has attracted more attention to many scholars and a series of experimental have been carried out to obtain certain research results.But for the complex of influencing factors such as the damage and failure mechanism of bonding properties and the difficulty of temperature test technology made the investigation of bonding between steel reinforced rebars and concrete is quite difficult in practice.So it is necessary to carry out some research on the bond performance between steel reinforced rebars and concrete after elevated temperatures.In this paper,a further study is made on bond performance between steel reinforced rebars and concrete after temperature based on the previous work,the main research work is as follows:(1)The research of bonding performance between steel reinforced rebars and concrete at different stages of change were carried according to the temperature effect on the performance of structure mechanics of materials,the calculating formula of bond stress,slip value and the related curves were derived and the changing rule were discussed.(2)The change of bond stress and slip value were measured and the related experiment data is given through the test s after heating and cooling.(3)Test measurement data and the theoretical calculation results were compared to analysis the reasons of error and verify the rationality of the derived formula in this paper.