Square Steel Tube Concrete Frame-diagonal Channel Steel Stiffening Research On Seismic Performance Of Steel Plate

Steel plate wall structure is a structure with excellent seismic performance,it has good ductility and energy consumption capacity,can be used in some high intensity areas,in order to play the best performance of the steel plate wall,to ensure that the rigidity of the vertical edge of the steel plate wall is large,this paper proposes a square steel tube concrete frame-oblique channel steel stiffened steel plate structure,to ensure the performance of the steel plate wall,with excellent mechanical properties.The finite element method was used to analyze the seismic performance of the steel tube concrete frame-oblique channel steel stiffened steel plate structure,and the main research contents are:1.Model the structure of the steel tube concrete frame-thin steel plate wall,compare it with the test results,verify the reliability of the model,and according to the modeling method of the oblique channel steel stiffener steel plate wall,the channel steel stiffener and the square steel tube concrete frame-thin steel plate wall structure are combined to complete the modeling of the square steel tube concrete frame-oblique channel steel stiffener steel plate structure,and compare it with the square steel tube concrete frame-thin steel plate wall structure.The results show that the structure has excellent mechanical properties such as higher bearing capacity,stiffness and energy dissipation after adding channel steel stiffeners.Moreover,the channel steel stiffener can reduce the "breathing effect" and "shock" phenomenon of the steel plate wall.2.Establish 60 single-layer single-span steel tube concrete frame-oblique channel steel stiffened steel plate wall structure model to apply monotonic load,every 12 as a group,and analyze the parameters of 5 influencing parameters.The results show that the high thickness ratio and the span height ratio have a great influence on the initial stiffness and ultimate bearing capacity of the structure,among which,the smaller the height to thickness ratio,the higher the initial stiffness and ultimate bearing capacity of the structure,and the larger the span to height ratio,the higher the initial stiffness and ultimate bearing capacity of the structure.The axial compression ratio,rib plate stiffness ratio,and torsional and bending stiffness ratio have almost no effect on the initial stiffness of the structure,and have little influence on the ultimate bearing capacity.It can be seen that in order to ensure the seismic performance of the structure,the high thickness ratio and span height ratio of the structure must be guaranteed.3.The boundary constraints of the steel plate wall of square steel tube concrete frame-oblique channel steel stiffened steel plate wall structure are divided into four-side connection type,three-side connection type and two-side connection type,and the structural model of single span and two layers is established to apply cyclic reciprocating load to these three boundary types,and hysteresis analysis is carried out.The results show that the stiffness,anti-lateral bearing capacity and energy consumption of the four-side connection type are higher than those of the other two boundary types,and the two-side connection type is the smallest,but the two-side connection type will not be in direct contact with the frame column,and the damage to the frame column is small,which is more in line with the criterion of "strong column and weak beam".4.The above-mentioned three boundary condition types are respectively established with a single-span 9-layer square steel tube concrete frame-oblique channel steel stiffened steel plate wall structure,and the time history analysis is carried out,and the results show that the structure under the three boundary conditions has good seismic performance,and the seismic performance of the four-side connection type is better than that of the other two boundary types.