Abstract:
To enhance the overall seismic performance of composite shear walls, an improved method of adding metal damping at the corners of composite shear walls is proposed. This method introduces metal damping connection plates and "wall toe steel boots", thus eliminating the need for cast-in-place edge components, reducing the area of insert bars at horizontal joints, and enhancing the energy dissipation capacity, self-resetting capacity and assembly performance of composite shear walls.To evaluate the seismic performance of the new type of composite shear wall, this paper first verified the reliability of the finite element simulation method through test data, and then conducted low-cycle reciprocating loading simulations on a total of 12 specimens in 3 groups.The research investigated the effects of axial load ratio, inserted steel bar configuration, and metallic damping materials on structural behavior. Results show that the improved shear walls demonstrate excellent seismic performance, particularly in deformation and energy dissipation capabilities, achieving "controlled rocking" and concentrated energy dissipation at horizontal joints. The study found that moderately reducing horizontal joint reinforcement improves self-centering ability. Design recommendations include avoiding high axial load states and using Q235 or Q345 low-carbon steel as damping material.