Study On Seismic Behavior Of D-type Eccentric New-type Buckling Restrained Braced Steel Frame Composited With High Strength Steel

The combination of high strength steel eccentrically braced steel frame has the advantages of high energy dissipation capacity of eccentrically braced steel frame and high strength of high strength steel,which is a kind of structure system with high performance.In this paper,a new-type of buckling restrained brace is applied to the high strength steel combination D-type eccentrically braced steel frame to form the high strength steel combination D-type combination new-type buckling restrained braced steel frame structure.The new-type buckling restrained brace has the characteristics of twice yield,which can advance into the yield to dissipation energy.In this paper,the finite element software ABAQUS is used to study the seismic behavior of the high strength steel combination D-type combination new-type buckling restrained braced steel frame structure.Firstly,on a two storey single span D-type eccentrically braced steel frame is modeled and analyzed by finite element software ABAQUS.The correctness of the finite element analysis method is verified by comparing the finite element analysis result with the experimental result.Secondly,according to the relevant code,design a single layer single span D type eccentrically new-type buckling restrained braced steel frame composited with high strength steel,and through the analysis of monotonic loading,compared with the corresponding high strength steel combination D-type ordinary eccentrically buckling restrained braced steel frame;then,studied the influence of the stiffness of the new-typebuckling restrained brace on the seismic performance of the D-type eccentrically braced steel frame composited with high strength steel.Finally,in order to study the seismic performance of D-type eccentrically new-type buckling restrained braced steel frame composited with high strength steel,designed six sets of parameters,respectively,the length of link beam,link beam web thickness,the distance of stiffening rib of web,the combination of different strength grade materials,depth-span ratio and axial compression ratio.Analysis of each parameter under the monotonic loading and cyclic loading of load displacement curve,hysteretic curve,skeleton curve,stiffness degradation curve,ductility performance,energy dissipation capacity and link beam deformation figure,get the change rule of various parameters on the structure of the bearing capacity,stiffness,ductility,energy dissipation performance,and suggestions for the range of each parameter values are given,which can provide reference for engineering design.