Finite Element Study On Siesmic Behavior Of Inserted Ribbed Steel Plate Shear Wall

With the rise of high-rise and super high-rise buildings,the design of lateral force resistance system has become more critical.Steel plate shear wall has been widely studied and applied because of its excellent seismic performance and great synergy with the surrounding steel frame.The stiffened steel plate shear wall is equipped with stiffening components outside the steel plate to inhibit the buckling of the steel plate and improve the seismic performance of the structure.In this paper,a new type of steel plate shear wall with inserted ribs is proposed.The vertical stiffening ribs are inserted into the transverse stiffening ribs to avoid bearing the vertical load,reduce welded connections and increase structure assemblability in the installation process.The seismic performance of the new type inserted ribbed steel plate shear wall was studied.In this paper,the finite element software ABAQUS is used to establish the steel plate shear wall model.By comparing with the existing tests,the reliability of the finite element simulation is proved.Through the comparison and analysis of the ribless steel plate shear wall,the welded ribbed steel plate shear wall,the inserted ribbed splice steel plate shear wall and the inserted ribbed steel plate shear wall under monotonic and reciprocating loads,the bearing capacity and seismic performance of the new type inserted ribbed steel plate shear wall are studied.The variable parameter analysis of inserted ribbed steel plate shear wall under reciprocating load is carried out,which includes the rib plate combination,the height to thickness ratio of steel plate,the structural axial compression ratio and the stiffness ratio of rib plate.Finally,the optimal structural design is recommended.The main research results are as follows:Under monotonic and reciprocating loads,the new type of inserted ribbed splice steel plate shear wall and inserted ribbed steel plate shear wall demonstrate good seismic performance.Compared with the ribless steel plate shear wall,the bearing capacity,energy dissipation capacity and stiffness of the above new type steel plate shear walls are improved obviously.The stiffening ribs effectively restrain the out-of-plane deformation of the steel plate.Compared with welded ribbed steel plate shear walls,the seismic performance of the new type steel plate shear walls is slightly improved.The seismic performance of the inserted ribbed splice steel plate shear walls is slightly lower than that of inserted ribbed steel plate shear walls.The variable parameter analysis of inserted ribbed steel plate shear wall is carried out,including the rib plate combinations,the height to thickness ratio of steel plate,the structural axial compression ratio and the stiffness ratio of rib plate.When the rib plate combination is increased from 3×3 to 5×5,more tension belts are generated to bear the whole load..The yield load,ultimate load,energy dissipation capacity and stiffness of the structure also increase,and the hysteretic curve "pinching" phenomenon is reduced.When the number of ribs reaches a certain quantity,the seismic performance of the structure can be improved limitedly by increasing the number of ribs,so the number of ribs should not be too many.When the height to thickness ratio of steel plate decreases,and the steel plate thickness increases,the yield load,ultimate load,energy dissipation capacity and stiffness of the structure are significantly improved.However,when the steel plate thickness is too thick,the stiffness of the steel plate does not match that of the frame,and the bearing capacity and energy dissipation capacity of the structure decrease significantly in the later loading period,so the steel plate thickness should not be too thick.With the increase of the axial compression ratio and the vertical load of the structure increases,the yield load,ultimate load and stiffness of the structure all decrease,and the hysteresis curve is "pinching" to a certain degree.However,the energy dissipation capacity of the structure increases with the increase of axial compression ratio because the tension belts are generated earlier.The stiffness ratio of rib plate has obvious influence on the seismic performance of the structure.When the stiffness of rib plate is relatively small,the hysteretic curve of the structure appears obvious "pinching" and the bearing capacity decreases.As the stiffness ratio of rib plate increases,the hysteretic curve "pinching" and the decrease of bearing capacity decline are reduced.In addition,the stiffness ratio of rib plate increases,which has a more effective restraint effect on the structure,and the yield load,ultimate load,energy dissipation capacity,and stiffness of the structure are gradually improved.However,when the stiffness ratio of rib plate reaches a certain level,the stiffener has enough strength to resist the deformation of the steel plate.Therefore,the seismic performance of the structure is not significantly improved by increasing the stiffness ratio of rib plate,so the stiffness ratio of rib plate should not be too large.The selection of the parameters should take into account the seismic performance and the overall economic factors of the structure.Considering the selection of the optimal parameters,it is recommended to select the rib plate combination of 4×4,the height to thickness ratio of steel plate of 400,the structural axial compression ratio of 0.3,and the stiffness ratio of rib plate η of 29-55.The comparative analysis of the new type of inserted ribbed steel plate shear wall shows that the seismic performance of the inserted ribbed splice steel plate shear wall and the inserted ribbed steel plate shear wall is reliable.Compared with ribless steel plate shear wall and welded ribbed steel plate shear wall,the seismic performance of the new type steel plate shear wall is improved.Compared with ribless steel plate shear wall,the improvement effect is more obvious.The variable parameter analysis shows that the seismic performance of the structure is improved when the rib plate combination and the stiffness ratio of the rib plate increase,or the height to thickness ratio of steel plate and the structural axial compression ratio decrease.Suggestions on the structural design of new inserted ribbed steel plate shear walls are given.