Research On Hysteretic Behavior Of Coupled Non-stiffened Thin Steel Plate Shear Wall Structures

Steel plate shear wall structure is a kind of anti-side force structural system that uses steel plates embedded in steel frames as the basic structural unit.The design concept of its "strong frame and weak wallboard" requires that the frame and embedded wallboard jointly control the lateral movement of the structure under small earthquakes and the embedded steel plate yields energy under the earthquake,and the frame remains elastic,which can realize the "self-reset" function of the structure after the earthquake and is easy to repair.Using connecting beams,two steel plate shear walls are connected to form a joint steel plate shear wall.The introduction of connecting beams can firstly make the steel plate wall structure more flexible and convenient,which is beneficial to increase the overall bending capacity and rigidity of the steel plate wall structure,and even form a steel core tube structure system with better lateral resistance.The second is to use steel coupling beams to dissipate energy and enhance the energy dissipation capacity of the structure.In this paper,the hysteretic behavior of the jointed steel plate shear wall is studied.First,the existing experiments are simulated by ABAQUS finite element modeling software.The validity of the model is verified by comparing the results.Then,the full-scale modeling and analysis of the jointed steel plate shear wall prototype structure involved in the test was performed.Based on the model hysteresis calculation results,the seismic resistance of the structure was evaluated in terms of bearing capacity,stiffness degradation,energy dissipation capacity,and failure mode.performance.The results show that the overall hysteretic curve of the jointed steel plate shear wallstructure is relatively full,and the steel coupling beam can participate in the overall energy consumption of the structure,which makes the structure form a "steel plate shear wall-steel coupling beam-frame" triple lateral resistance system.The yield sequence of the jointed steel plate shear wall structure is filled steel plate-steel coupling beam-outer column-inner column.Then,by changing the height of the connecting beam and the thickness of the wall plate,10 sets of steel plate shear wall models with different coupling ratios were obtained,and a single push analysis was performed to obtain the relationship between the coupling ratio and the axial force ratio of the column.The axial force of the frame side column and the inner column will approach as the coupling ratio increases.When the degree of coupling is less than 0.6,the inner column of the right steel plate shear wall is stretched and the side column is compressed.When the coupling ratio is greater than 0.6,the inner column and side column of the right side steel plate shear wall are compressed.Finally,in order to study the influence of different parameters,namely coupling ratio,failure form of steel coupling beam,wall panel thickness,floor height,etc.,on the bearing capacity,ductility and hysteretic performance of the jointed steel plate shear wall structure.The design adopts the orthogonal test analysis method to conduct comparative research and analysis in terms of the bearing capacity,stiffness degradation,energy dissipation capacity and failure mode of the structure.The research shows that the optimal yield mechanism of the jointed unstiffened thin steel plate shear wall structure is the shear yield of the inner-filled steel plate and the connecting beams of all floors,the plastic hinge is fully developed,and then the plastic hinge appears on the side column.By controlling the coupling ratio between 0.4-0.6,and the coupling beam is a shear-type coupling beam,the structure can produce plastic hinges according to the development sequence of the assumed plastic hinges.