Seismic performance of a new type of swaying self-resetting vertical tooth shear wall

The consolidated shear wall fixed on a foundation is the easiest to be damaged in earthquake with poor energy consumption and it is difficult to repair after earthquake. A new system of swaying self-resetting vertical tooth shear wall (SCVT-SW) was proposed. The SCVT-SW system consists of reinforced concrete walls, disc spring resetting devices, mild steel dampers and vertical tooth swing supports, all of which are connected by high-strength bolts to facilitate the construction and replacement of damaged parts after earthquake. The working principle of the SCVT-SW system is as follows: in the process of earthquake, the vertical disc spring resetting devices on both sides of the wall provide the wall swaying reset bending moment, the mild steel damper consumes the seismic energy, and the vertical tooth swaying support plays a role of fixing the hinge support while providing the horizontal shear resistance and transferring the horizontal force on the wall to the wall foundation. The calculation formula for the wall section bearing capacity in the SCVT-SW system was given. Through nonlinear numerical simulations, the mechanical properties of the new shear wall and the ordinary shear wall were compared, and 9 groups of different working conditions were designed. The results show that, comparing with ordinary shear walls, the skeleton curve of the SCVT-SW has no obvious descending section and the residual deformation is smaller. The bearing capacity of the SCVT-SW system increases with the increase of the prepressure of the disc spring devices on both sides of the corner, and the maximum increase is 27. 8%. The residual deformation decreases with the increase of the stiffness of the disc spring device, and the reduction is 19.4% greater in working condition 7 than in working condition 5 and 46. 9% greater in working condition 8 than in working condition 5. Therefore, the residual deformation of the SCVT-SW can be reduced by increasing the prepressure and stiffness of the disc spring device, and the effect of improving the reset ability is significant. © 2024 Chinese Vibration Engineering Society. All rights reserved.