Fuzzy Control Strategy for Vibration Isolation of Bridge Based on Magneto-rheological Bearing

As the weakest part of the bridge system, traditional bridge bearing is incapable of isolating the heavy load such as earthquake. The developed Bouc-wen model is firstly used to represent the constitutive relation and force-displacement behavior of MRB. Then, the lead rubber bearing (LRB), passive magnetorheological elastomer bearing (MRB) and controllable MRB are modelled by finite element method (FEM), and the fuzzy control algorithm for the MRB is then designed. Furthermore, several types of seismic wave is introduced to simulate and the experiments are carried out to investigate the different response along the bridge with the results show that the isolating performance of passive MRB is similar to that of traditional LRB, which ensures the fail-safe capability of MRB. In addition, the controllable MRB embodies the advantage of isolating capacity and energy dissipation, because the displacement of bearing decreased by 34.1%. The shear force from the pier top is also alleviated.