Shake Table Test And Simplified Model Of Multi-ribbed Grid Composite Steel Plate Shear Walls

The structure of multi-ribbed grid composite steel plate shear wall is a new lateral force resisting structural system with excellent mechanical properties and good applicability.This system transforms the steel plate shear wall from low-order buckling to high-order buckling through the multi-ribbed grid buckling constraint mechanism,which effectively limits the out-of-plane deformation of the wall panel,improves the buckling load of the structure,delays the structural stiffness degradation.At present,domestic and foreign research on this structure are relatively few,and only limited to quasi-static.Firstly,the experimental research focused on the shake table test of a four-story multi-ribbed grid composite steel plate shear wall scale model.The results indicated: the multi-ribbed buckling constraint structure effectively limits the out-of-plane deformation of the wall panel and the noise and tremor caused by the respiratory effects.During the loading process,the buckling restraint steel plate wall is the first seismic-resistant line of the system,which enters the elastic-plastic stage first,then absorbs the dissipated seismic energy and protects the frame column and the whole structure effectively.The lateral stiffness of the structure is gradually degraded but not obvious,and it still has a large lateral stiffness after experiencing the rare earthquakes.The maximum lateral interlayer drift of the structure during the frequent earthquake and the rare earthquake is in accordance with the seismic specification.Based on the experimental results,the finite element model of the multi-ribbed grid composite steel plate shear wall was established by finite element analysis software ABAQUS 6.12.Comparing with the time-history analysis results of pure frame model,the steel plate wall can effectively limit the interlayer drift.But the out-of-plane deformation of the unstiffened steel plate shear wall during the rare earthquake is larger,and the lateral stiffness of the local floor is degraded seriously.The multi-ribbed buckling constraint structure makes the overall structure maintain uniform lateral stiffness during rare earthquakes,improves the plastic energy consumption,and improves the seismic performance of the steel wall.Finally,this paper investigates the accuracy of simplified models of the unstiffened steel plate shear wall in both static and dynamic aspects.By comparison we can see that Combined Strip Model shows performance over other simplified models in many respects,which is highly accurate and has practical potential.Based on the form of Combined Strip Model,a simplified model for the multi-ribbed grid composite steel plate shear wall is proposed.The accuracy and the use value of the simplified model are proved in the aspects of monotonic loading performance,hysteresis performance,time-history analysis performance and comparison of test results.