عنوان مقاله [English]
This study focuses on the application of Interval type 2 fuzzy logic controller (IT2FLC) in an active tuned mass damper (ATMD) for the purpose of decreasing structural response under different types of earthquake excitations with and without considering Soil-Structure Interaction (SSI) effects. One of the main shortcomings of the type 1 fuzzy logic systems is their inability to consider uncertainty in fuzzy rule base data. Interval type 2 fuzzy logic \ system has the ability to handle this problem. It also takes into account the uncertainty in loading and \ structural behavior. To evaluate the \ efficiency of the proposed control method (Interval type 2 fuzzy logic control method), three realistic shear buildings (five, eleven, and fifteen stories), were used. ATMD was placed on the top floor of the eleven story shear building. These buildings were analyzed under different time history records, including Hachinohe, El Centro and Kern-County earthquakes, as far field ground motions and Coalinga, Kobe and Northridge earthquakes as near field ground motions. The results obtained by the proposed control method were compared with those of uncontrolled structure, structure with tuned mass damper (TMD), and structure with ATMD with type 1 fuzzy logic controller. Numerical results indicated that Interval type 2 fuzzy logic controllers used in ATMD are very effective in reducing the structural response under the effect of different base excitations. The comparison of time history responses for type 1 fuzzy logic controller and Interval type 2 fuzzy logic controller also shows that the displacement response obtained using Interval type 2 fuzzy logic controller is smaller and smoother than, those obtained by type-1 fuzzy logic controller. In the view of the external control force needed to reduce the building response, the magnitude of the control force in Interval type 2 fuzzy logic controller is little more than those needed for type 1 fuzzy logic controller with the average about 8 percent. In case of considering SSI effects, the results show that the soil properties have important effects on the uncontrolled response of the building. In addition, it can be understood from the results that considering SSI can improve the efficiency of ATMD with IT2FLC in the case of suppressing the structural responses.