变摩擦多级FPS-TMD系统减震性能研究.

This paper proposes a multi-stage FPS-TMD system with variable friction coefficient in order to improve the performance of FPS-TMD and expand its application due to the inherent nonlinearity of FPS-TMD. The equation of motion of multi-stage FPS-TMD system is established by Lagrange principle. The numerical solution to the multi-stage FPS-TMD system is obtained considering stick-slip effect of FPS. A multi-objective optimization design method for the multi-stage FPS-TMD system is presented basesd on nondominated sorting genetic algorithm Ⅱ. A landscape tower is used as numerical example and a two-stage FPS-TMD system is designed and analyzed with the traditional TMD and FPS-TMD systems. The research results show that the two-stage FPS-TMD system with variable friction coefficient provide more energy dissipation capacity during moderate earthquake and reduce structure displacement response by 16.34% as compared with the constant friction FPS-TMD system during minor earthquake. Moreover, the FPS-TMD system with variable friction is slightly better than the conventional TMD designed by Den hartog formula. [ABSTRACT FROM AUTHOR]