Nonlinear structure vibration control with semi-active friction damper using fuzzy logic method

摘要

In the civil engineering, many control algorithms and devices have been proposed for protecting structures from severe damages over the past few decades. Most of the studies in the area of active and semi-active structure control have focused on the application of linear control theories. However, such a linear model does not fully represent the behavior of the building when subjected to severe earthquakes and nonlinear behavior is likely to occur. The objective of this paper is to investigate the performance of dissipative device for nonlinear building structure against strong earthquakes. The implementation of semi-active friction damper for vibration mitigation of seismic structure generally requires an efficient control strategy. Herein, the fuzzy logic based on Takagi-Sugeno model is proposed for controlling a semi-active friction damper that is installed on a nonlinear building subjected to strong earthquakes. The continuous Bouc-Wen hysteretic model for the stiffness is used to describe nonlinear characteristic of the building. The optimal sliding force with friction damper is determined by nonlinear time history analysis under normal earthquakes. The Takagi-Sugeno fuzzy logic model is employed to adjust the clamping force acted on the friction damper according to the semi-active control strategy. Numerical simulation results demonstrate that the proposed method is very efficient in reducing the peak inter-story drift and acceleration of the nonlinear building structure under earthquake excitations.