Study On Seismic Performance Of Self-centiering Damper By Using Friction Energy Consumption Through Wedged Sliding Blocks

This paper proposes a self-centering damper that utilizes the frictional energy consumption of wedge sliding friction.The damper consists of a Ni-Ti shape memory alloy(SMA)rod and a friction wedge.Compared with other existing types of SMA-based self-centering dampers,this damper can significantly improve the energy absorption capacity.Moreover,the strength and deformability of the damper can be easily adjusted according to needs.In order to verify the energy dissipation and self-centering ability of the new type damper and its anti-seismic effect in the structure,a series of local to overall studies on the damper are carried out in this paper.The specific work of this paper is as follows:1.Introduced the structure and mechanical model of SMA self-centering damper using the friction energy consumption of the wedge.For the use of SMA to provide reaction and recovery forces,the wedge provides friction during operation,establishes a mechanical equilibrium equation,and on the basis of the SMA constitutive model,calculates the output of the SMA and the friction output of the wedge based on the damper displacement.2.Performed performance tests on the new type damper,considered a series of different loading systems,and conducted comparative analysis.Tests have shown that the new type of damper can exhibit a stable hysteretic energy dissipation response and reliable self-centering performance without any visible damage in the damper components.The test results also show that the new damper is insensitive to different loading schemes and has good stability.After that,the solid modeling finite element analysis was carried out on the experiment,and the ideal simulation effect was obtained.Overall,the energy dissipation capability and self-centering effect of the damper were verified through performance tests and simulations.3.Second development of ABAQUS.This paper establishes a theoretical model of a new type of damper and uses Fortran to program and design the theoretical model.At the same time,the program is added to the UMAT subroutine of the finite element software ABAQUS to form a new type of damper unit.The new type of damper unit can accurately describe the nonlinear response of the test specimen.4.In order to verify the effect of self-centering dampers in eliminating earthquake damage in the structure,a new type of damper unit was applied to the nodes of the Benchmark structure,which was designed as an improved self-centering Benchmark structural frame and compared with the rigid-connected structural frame for seismic response analysis.The results show that the self-centering frame can effectively control the residual interlayer displacement angle of the structure and has a good self-centering effect.At the same time,a comprehensive evaluation index for the self-centering structure was designed to evaluate the contribution of the self-centering damper to this structure in terms of the overall performance of the structure and the performance of non-structural components.The specific improvement measures are:the self-programmed damper unit is added to the node of the three-layer Benchmark structure,and the just-connected frame becomes a self-centering frame to improve the yield condition of the steel frame.