A Semi-active Control Method for Structural Vibration Subject to Near-field Earthquakes

Abstract

Purposes In this paper, a semi-active control method for structural vibration subject to near-field earthquakes is proposed. A neuro-fuzzy model is used to capture rate and temperature dependent nonlinear behavior of the SMA components of the hybrid device. Methods According to characteristics of near-field earthquakes, a non-dominated genetic algorithm is employed to design a self-organizing fuzzy controller. To obtain optimal controllers for concurrent mitigation of displacement and acceleration responses, fuzzy governing rules is tuned with the multi-objective heuristic optimization. Then, numerical simulation of a multi-story building is conducted to evaluate the performance of the hybrid device. Findings Results show that a self-centering variable friction device modulated with a fuzzy logic control strategy can effectively reduce structural deformations without increasing acceleration response during near-field earthquakes.

Keywords

• semi-active control
• variable friction damper
• shape memory alloy
• near-field earthquake
• non-dominated genetic algorithm