Shear Mechanism Of Steel Fiber Reinforced Concrete Walls

Traditional RC shear walls are usually used as the main lateral force-resistant members of high-rise buildings.Although they have the advantages of large lateral stiffness and high lateral strength,they have poor deformation and energy dissipation capabilities.Steel fiber RC shear wall(SFRCW)is a kind of shear wall structure based on the traditional RC shear wall structure,obtained by adding appropriate amount of steel fiber to concrete,which can improve the deformation and energy dissipation capacity of RC shear wall to a certain extent.At present,the research group has carried out the hysteretic performance research of partially-restrained steel frame with concealed vertical slits RC infill wall and RC shear wall panel with vertical slits.However,the shear mechanism and hysteretic behavior of steel fiber RC shear walls have not been investigated.Based on this,an experimental investigation on the shear performance and hysteretic behavior of steel fiber RC shear walls was conducted,and a research on the shear capacity of steel fiber RC walls was conducted by numerical simulations.The main tasks are as follows:(1)Three one-bay,one-story SFRCW specimens on one-third scale are designed and tested under quasi-static test.The effects of steel bars orientation of SFRCW on the failure mechanism,hysteretic performance,shear strength,lateral stiffness degradation,strength degradation,ductility,and energy dissipation capacity of these specimens were investigated.(2)Based on the ABAQUS software,a refined finite element model of three SFRCW specimens was established,and the rationality of the finite element model was verified by comparing the test results and simulation results.(3)Seven series 15 full-scaled SFRCW panels were designed,and carried out parametric finite element analysis through ABAQUS.The influences of wall thickness,concrete strength grade,height-width ratio,steel bars orientation,steel fiber proportion,reinforcement spacing and longitudinal bar grade on the shear strength,lateral stiffness and ductility of SFRCW panels were studied.(4)Based on the test and simulation results of SFRCW,combined with the specifications of different countries,the overstrength of SFRCW were analyzed.