Bond Behaviour Of Steel Reinforced Concrete Members After Exposure To Standard Fire

Steel reinforced concrete (SRC) members are increasingly used in industrial,building, and bridge structures. The bond behaviour of steel reinforced concretemembers is fundamental to achieve composite action between the steel and concrete.In the past, no research was conducted to investigate bond behaviour of steelreinforced concrete members after exposure to fire. There is a research need toaddress this issue for possible fire damage assessment and repair consideration.In this paper, the bond-slip behavior of steel reinforced concrete members afterexposure to standard fire was experimentally investigated by push-out tests. Then finiteelement (FE) analysis was performed to simulate the push-out test results. The mainachievements of the research can be summarised as follows:(1) Push-out tests were conducted on8fire-exposed specimens and3undamaged specimens to study bond-slip behaviour of the steel and concrete. Themain parameters in the tests included concrete strength, concrete cover thickness,volume ratio of stirrups and fire-exposure time.(2) Temperature field of SRC specimens was calculated using the FE softwareABAQUS, and it was verified by existing testing results. Effects of differentparameters on the temperature distribution were analysed based on the FEmodelling.(3) An FE model was established using cohesive elements to simulate bond-slipbehaviour of SRC specimens. Stress distribution and development along the contactsurface between the steel and concrete was studied, and the bond failure wasanalysed.(4) A theoretical research was carried out to investigate the bond-slipmechanisms. Meanwhile, a simplified model was put forward to predict the bondstrength of fire-exposed SRC, which may be used for design purposes.