Seismic design method and experimental study of composite steel plate-concrete coupled shear wall systems

Composite steel plate-concrete coupled shear wall systems are excellent seismic structures with dual seismic fortification mechanism, and the theoretical research about it has already lagged behind the engineering practice. The traditional strength-based seismic design method cannot solve the matching problem of steel beam and composite wall from the perspective of seismic coupling mechanism. This paper proposes the seismic design method of composite steel plate-concrete coupled shear wall systems with coupling ratio as the basic design parameter and the coupling beam-wall dual seismic fortification mechanism as the performance objective. Based on this method, the prototype structure was designed firstly. Then a 1/4 scaled 5-story model was fabricated according to the prototype structure and tested under a cyclic lateral loading to investigate the overall yielding mechanism. The test results indicate that the structure system dissipates energy by shear deformation of steel beams and plastic hinge deformation at the bottom of the wall. The coupling beam-wall dual seismic fortification mechanism is realized. The design method is feasible.