Performance-based Plastic Design And Seismic Performance Of Coupled Steel Plate Shear Wall

As one of the anti-lateral force structural systems,steel plate shear wall(SPSW)has been widely concerned by scholars and more and more used in practical engineering projects due to its excellent properties such as large stiffness,good ductility and strong energy dissipation capacity.In order to meet the functional requirements of building opening Windows and opening holes,engineers usually connect two steel plate shear walls with steel coupling beams to realize the coupling of two wall piers or even multiple wall piers and form Coupled Steel Plate Shear Wall(C-SPSW).The existence of the coupling beam makes the wall piers interact with each other to improve the mechanical performance of the structure,so that the energy dissipation acts on the whole height range,and enhances the overall bearing capacity and stiffness.At the same time,the connecting beam can dissipate a lot of energy,making the structure safer and more reliable under the earthquake action.But at present,the research on the C-SPSW mostly stays at the member level,and the research understanding on the design method and seismic performance analysis is limited.Under the background that the country is vigorously promoting the use of steel structure,the research on the seismic performance of the structure is more meaningful.In this paper,on the basis of the principle of energy balance,the preset base shear force,target displacement and failure mechanism are taken as the main performance control parameters.By using the shear distribution mode of elastoplastic layer proposed by Chao and Goel,and in combination with relevant design specifications,a complete set of Performance-Based Plastic Design(PBPD)process for C-SPSW is deduced.Adopts the method based on 8 degrees(0.3g)under the condition of seismic fortification 12 CSPSW structure was designed,finite element analysis software ABAQUS is used to analysis the structure of the monotonic pushover analysis,the hysteretic performance analysis and dynamic elastic-plastic time history analysis,the research discusses the design structure stiffness degradation,energy dissipation capacity,super ultimate bearing capacity,yield sequence component,internal force of the development,the overall deformation,even the results of the beam angle,etc.The main research results and conclusions of this paper are as follows:(1)The structure has stable hysteretic characteristics and good energy dissipation capacity,and meets the expected failure mode of filled steel sheet-steel coupling beamouter frame column-inner frame column.The increase of the Degree of Coupling ratio(DC)will improve the bearing capacity of coupled steel plate shear wall,and the maximum increase will be seen when DC changes from 0.4 to 0.5.The larger the DC is,the faster the stiffness degradation rate of the structure will be.Therefore,on the basis of considering the ductility of the structure and the total energy consumption,the design DC is suggested to be between 0.4-0.5.With the increase of the DC,the yielding time of the beam will be relatively delayed,while the yielding time of the frame column will be earlier.(2)The higher the floor is,the smaller the initial elastic stiffness of the designed structure will be,the larger the overall yield displacement Angle of the structure will be,and the later the structure will enter the plastic stage.The displacement angle of the top floor is between 0.63% and 0.75%,which is close to the design yield displacement angle of 0.6%.The whole structure shows bending and shear deformation,and the horizontal displacement of the floor is higher than the expected target displacement.The maximum inter-story displacement angle is between 1/40 and 1/30,indicating that it is more safely to take 1/50 as the limit value of collapse prevention index.(3)The axial force of the inner column is smaller than that of the outer column due to the action of the connecting beam.With the increase of the DC and the size of the connecting beam,the axial force that the connecting beam can bear is larger.When the structure yields,the redistribution of the internal force will reduce the axial force of the inner column.At the same time,DC of the structure changes with the development of pushover loading,and the error between the peak value of the change curve and the preset DC is small.(4)The maximum inter-story displacement angle of the structure under rare earthquake action level is within the limit set by the code.The structure can absorb a lot of seismic energy and has good seismic performance.Through the extraction calculation and analysis,it can be seen that the lateral force distribution model based on the maximum layer shear distribution coefficient can fit the layer shear distribution in the upper part of the structure well,while the prediction of the shear distribution in the middle part of the structure has a certain overestimation.The joint beam can deform well under the rare earthquake action and dissipate a lot of seismic energy.