Experimental and numerical analysis on seismic performance of straight-tenon joints reinforced with friction damper

摘要

A comprehensive study has been carried out on the seismic behavior of straight-tenon joints (STJs) reinforced with the state-to-art friction damper. Quasi-static cyclic tests were conducted on three reinforced test specimens and one contrast joint, and friction coefficients were selected as the variables. The failure modes and the cyclic behaviors of both STJs and fiction plates were obtained. Numerical simulation was conducted to investigate the plastic deformation and stress distribution of the STJs, and a parametric study on the friction coefficient was also performed. Results show that the main failure modes of the reinforced STJs include the pressing dents on the column, the tenon extraction, and the surface of friction plate being smoothed. Increasing the friction coefficients of the friction plates helps to reduce the extraction of the tenon and promote the stiffness, bending moment, and energy dissipation capacities of the reinforced STJs. Furthermore, 0.4 is considered as the optimal friction coefficient in terms of the cyclic behavior and energy dissipation of reinforced STJs. Additionally, the composition of energy dissipation of friction plates first decreases and then slightly increases as far as the rotation increases. Numerical simulation agrees well with the experimental results, and the parametric study shows that for the reinforced STJ with a higher friction coefficient, higher yielding moments and ultimate moments can be obtained, but the friction coefficients have little effect on the ductility.