Seismic Behavior And Numerical Analysis Of Steel Plate Shear Wall With Multi-rib Repaired After Earthquake

One of the seismic design concepts in China is the "repairable in mid-earthquake".That is to say,when the structure is affected by the earthquake of corresponding fortification intensity,it can still be used after general repair.As a kind of building structure with excellent seismic performance,steel plate shear wall(SPSW)structure is more and more applied in high-rise buildings.Therefore,the research on post-earthquake repair of SPSW structure is of great significance.In this paper,a method of repairing damaged non-stiffened SPSW with multi-rib is proposed.The method is simulated by the finite element software ABAQUS-6.14.The validity of the model is validated by comparing with the two existing experimental processes and results.The hysteretic characteristics,energy dissipation capacity and stiffness degradation of the members before and after repair are studied.The results show that the members after repair with multi-rib have good seismic energy dissipation capacity.By comparing the performances of the model without repair,the model with oblique ribs of channel steel and the model with multi-rib,the improvement of the seismic capacity of the model after different repaired methods is analyzed.The conclusion is drawn that the method with multi-rib is better than that with oblique ribs of channel steel.Under the same amount of steel,the hysteretic energy dissipation capacity and stiffness of the model with multi-rib increase greatly.The parameters of the repaired model are analyzed by simulation.The effects of different rib spacing,stiffness ratio of rib,height-thickness ratio of wall plate,form of frame columns and stiffness of beam-column joints on the seismic performance of the repaired model are studied.The results show that:(1)Reducing the rib spacing is beneficial to improve the energy dissipation capacity of the model,but much dense rib can lead to the stiffness mismatch between the wall plate and the frame,thus leading to premature failure of the column;(2)Increasing the stiffness ratio of the rib plate can effectively improve the buckling of the wallboard and increase the energy dissipation capacity of the structure.But when the stiffness ratio of the rib plate reaches a certain level,the seismic performance of the structure is not obvious.(3)The model with small wall plate height-thickness ratio has full hysteretic loops and large initial stiffness,but the stiffness degradation of the model is serious;(4)The form of frame columns has a significant impact on the seismic performance of the model.The model with large crosssectional area of columns has high bearing capacity and strong energy dissipation capacity.In addition,the out-of-plane stiffness of columns has an important impact on the bearing capacity of the specimens;(5)The stiffness of the beam-colum joint has little effect on the bearing capacity and stiffness,but the semi-rigid beam-column joint model has less force than the rigid joint model in the simulation process,and the force is more reasonable.Finally,from the perspective of time history analysis,the dynamic response of multirib repaired model and non-repaired model under earthquake acceleration time history is compared by means of simulation.The results show that the multi-rib can effectively limit the inter-story displacement of the structure,reduce the out-of-plane deformation of the wall plate,and improve the seismic performance of the structure.