Finite Element Analysis Of Steel-GFRP Composite Reinforced Sea Sand Concrete Shear Wall

With the acceleration of urbanization and the rapid development of high-rise buildings.Because of its excellent seismic performance,shear wall has become one of the components widely used in high-rise buildings.In order to realize the green sustainable development of the concrete structure and solve the problem of river sand resources being depleted,the use of more abundant sea sand instead of river sand to prepare concrete gradually becomes an inevitable trend.However,sea sand concrete will lead to corrosion of steel bars,making the durability of the structure very poor.Fiber reinforced polymer(FRP)has high strength and excellent durability.If it is applied to sea sand concrete,it can effectively solve the problem of steel corrosion in chloride ion environment.But FRP is a linear elastic material with high brittleness,and the direct application to shear wall structure has the problem of insufficient ductility.In this paper,steel fiber composite reinforcement(SFCB),which combines the advantages of steel and FRP materials,is used to solve the problem of shear wall ductility caused by the brittleness of FRP materials and make it better combined with sea sand concrete.This paper designs a new type of shear wall named steel-GFRP composite reinforced sea sand concrete shear wall,whose longitudinal stress bar is SFCB,horizontal stirrup is pure FRP bar,and the concrete structure is sea sand concrete.This paper adopts finite element analysis method to study the seismic performance of this member.The main research contents are as follows:(1)By uniaxial tensile test,the tensile mechanical properties of SFCB are studied,the relationship between the failure and stress-strain of SFCB is analyzed.The theoretical analysis of SFCB is made by material composite law,and the influence of FRP cladding material and steel fiber ratio on the performance of SFCB is discussed,which provides material theoretical basis for the following finite element study.(2)The finite element model of shear wall is established by using software ABAQUS.The material constitutive model,element type,contact condition,boundary condition,mesh division and other problems in the finite element model are discussed.According to the pseudo-static test result of steel-GFRP composite reinforced sea sand concrete shear wall,the model reliability is verified by comparing the hysteretic curve and the skeleton curve with test result.(3)Based on the verified model,the parameter expansion analysis is carried out to analyze the influence of axial compression ratio,stirrup ratio,SFCB reinforcement ratio,sea sand concrete strength,SFCB steel-fiber ratio and shear span ratio on the seismic performance of members.The seismic performance of shear wall includes hysteretic curve,skeleton curve,bearing capacity and ductility,stiffness change,energy dissipation capacity and residual deformation.(4)Based on the results of shear wall simulation,this paper explores the failure mode of shear wall,and establishes the formula of the bearing capacity of the normal section.Finally,the rationality of the formula is verified by comparing the bearing capacity of the simulated component with the calculation results of the formula.