Research on Hysteretic Behaviour of Coupled Steel Plate Shear Wall Structures Based on Coupling Ratio

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. 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 was studied. The existing experiments were simulated by ABAQUS finite element modeling software. The validity of the model was verified by comparing the results. First, 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 ratio (CR) were obtained, and a single push analysis was performed to obtain the relationship between the CR and the axial force ratio of the column. The axial force of the frame side column and the inner column will approach as the CR increases. When the CR is less than 0. 6, the inner column of the right steel plate shear wall was stretched and the side column was compressed. When the CR is greater than 0. 6, the inner column and side column of the right side steel plate shear wall were compressed. Because the increase in CR is due to the enhanced coupling effect of the coupling beam on the structure, and the coupling beam can transmit axial force, the greater the CR, the stronger the coupling effect of the coupling beam, and the stronger its ability to transmit axial force. Therefore, the axial force of the side column can be shared, and the column 3 and the column 4 can be compressed at the same time. When the CR is small, the overturning moment is mainly resisted by the coupling formed by the side column axial force. As the CR increases, the inner column axial force increases correspondingly, which can resist overturning and protect the side column. In an ideal state, the side column and the inner column are destroyed at the same time. Then, in order to study the influence of the CR on the hysteretic performance of the joint steel plate shear wall, the CR was changed by changing the coupling beam section and the thickness of the wall panel, and six specimen models were obtained. The effect of the CR, coupling beam section size and wall thickness on the bearing capacity, ductility, stiffness degradation, energy dissipation capacity and failure mode of the joint steel plate shear wall structure was studied through pseudo-static analysis. The research shows that when the CR is between 0. 4~0. 6, the coupling beam and the wall panel can produce sufficient shear yield. The plastic hinge at the end of the column finally appeared, causing structural damage. Steel coupling beams can participate in the energy dissipation of the structure well, and the "steel plate shear wall-frame" anti-lateral force system has been improved to the "steel plate shear wall-steel coupling beam-frame" anti-side force system.