Influence analysis of the structure seism reduction effectbased on negative stiffness principle
JI Han1,2; *XIONG Shi-shu1,2; YUAN Yong1,2; FU Jie1,2
1. School of Civil Engineering & Mechanics, Huazhong University of Science & Technology, Wuhan 430074, China;2. Hubei Key Laboratory of Control Structure, Huazhong University of Science & Technology, Wuhan 430074, China
Abstract：This study presents the seism reduction system based on the negative stiffness principle and two kinds of realizable idea by analyzing the characteristic of the general vibration control system, and discusses the seismic response reduction effect of the structure added the negative stiffness damping installations. Using the ratio of the supplementary stiffness and the ratio of the supplementary damping ratio as control parameters, the effect of the dynamic magnification factor and the transmission ratio of the single-degree-of-freedom seism reduction systems with the positive stiffness and the negative stiffness are discussed. The seismic response of the seism reduction systems with the positive stiffness and the negative stiffness is analyzed by FEM. The response contains frequency, displacement, velocity, acceleration and shearing force of the columniation. The results show that the absolute acceleration of the superstructure is decreased. The analysis indicates that the negative stiffness of the negative stiffness damping installations can counteract the positive stiffness of the structure, reduce the frequency, enhance the damping of the structure, decrease the dynamical responds of the superstructure, and make the structure seism reduction capability more observably.
2010, Vol. 29 
