Experimental Study On Shear Behavior Of Steel Ductile Fibler Reinforced Concrete Short Beams And Onlinear Finite Element Analysis

Steel reinforced concrete structure is one of the most important and new structure in Modern Engineering.It has the characteristics of the concrete structure and steel structure which includes light weight,good ductility,high rigidity and good seismic energy dissipation capacity.It meets the development direction of engineering structure and has significant economic and social benefits.Due to building function change or spatial layout requirements,no matter in the urban industrial and civil architecture or in urban rail transit construction,it’s usually prone to short beam which span-depth ratio is small.Short beam always happens to brittle failure.Because of the brittleness of concrete,the shear capacity problem of steel reinforced concrete short beam hasn’t been able to get a good solution.Domestic research on steel reinforced concrete beam starts late and the theoretical system and calculation method is not perfect.High ductility fiber reinforced concrete is a excellent performance of new materials which has high tensile strength,high ultimate tensile strain,crack propagation properties and tensile strain- hardening properties.Useing high ductility fiber reinforced concrete as matrix material added to the steel reinforced concrete short beams can greatly improves the characteristics of brittle failure.In order to explore steel with high ductility fiber reinforced concrete short beam shear properties and failure mechanism,this research design to make 8 steel(with high ductility) reinforced concrete short beams.The static experiment was carried out on them.The situation of cracks,failure pattern,the bearing capacity,load deflection curve,ductility,strain of steel bar and steel were analyzed.Then the beams were simulated by the finite element software ABAQUS.The experiment and simulation results is at a high degree of consistency.The parameters which were not taken into account were simulated.Finally,using strut-tie model to establish a suitable shear bearing capacity calculation formula for steel with high ductility reinforced concrete short beam.The experimental results showed that adding the HDC into steel reinforced concrete short beams can improve its brittleness properties of shear failure.Ductility is greatly improved.The failure pattern has been improved.The degree of damage is small.It is conducive to strengthening and repairing of damaged structure.