Experimental And Numerical Simulation Study On Anti–explosion Performance Of Steel Fiber Reinforced Concrete

The development of Steel Fiber Reinforced Concrete(SFRC)can be traced back to 1910,which was initiated by Poter in the United States.Later in the Second World War,Japan needed to use it for anti–explosion structure.Because steel fiber concrete has strong crack resistance,good elongation performance,excellent energy dissipation and absorption performance,and superior impact resistance.Not only in the construction industry,bridge engineering,airport and port engineering,national defense and military applications are highly favored;It has been well loved by researchers from all walks of life.In the existing research,SFRC has a lot of achievements under low and medium strain rate loading,but the direct plane explosion wave loading of structural members is not available.The constitutive of steel fiber reinforced concrete under high strain rate is also not perfect.Due to the great difficulty in controlling explosion experiments,many scholars remain in single experimental research or numerical simulation analysis,without specific comparative analysis and verification.In this paper,the dynamic response and failure characteristics of SFRC spindles under explosion load are systematically studied by combining theory,experiment and simulation.The main research and innovation of this paper is as follows:(1)The development history of steel fiber reinforced concrete,the research significance of this paper,the development prospect of concrete and the reasons for choosing the topic in accordance with the background of The Times are described,and the current situation of theoretical research,experimental research and numerical simulation research in the field of SFRC anti–explosion at home and abroad is introduced.(2)analysis of steel fiber reinforced concrete materials are mainly introduced in the quasi–static experiments of the mechanical properties,the different steel fiber content of SFRC quasi–static experiments of the spindle,the compressive strength,the strength of steel fiber content on the static pressure effect,and the content of steel fiber different effects on the damage form of SFRC spindle.(3)Using the self–developed plane explosion wave loading device,the plane explosion wave impact experiments of 10 groups of SFRC spindles with different steel fiber content under different explosive equivalents were completed,and the dynamic response,failure characteristics and mechanical properties of SFRC spindles under explosion loading were obtained.(4)Explicit dynamic analysis software ANSYS/LS–DYNA was used to simulate the dynamic response of SFRC spindle specimen under blast wave loading.The effects of different explosive yield and steel fiber content on the mechanical properties of steel fiber reinforced concrete are analyzed.The correctness of the simulation analysis is verified by comparing the experimental values with the calculated values,and the reliability of the improved K&C material model,the explosive loading device and the explosive testing system are also verified.