Vibration control of stiffness irregular structures under near and far-field earthquakes by MR dampers and fuzzy controllers

Document Type : Research Article

Authors

1 Department of Civil Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran.

2 Faculty of Civil Engineering, Semnan University, Semnan, Iran.

3 Seismic Geotechnical and High Performance Concrete Research Centre, Department of Civil Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran.

Abstract

With the increase in the population of cities and the lack of spaces for construction, the creation of diverse uses, architecture and beauty of structures, the need for irregular structures is increasing. One way to reduce the construction hazards is to use vibration control tools in them. In the present study, the performance of a magnetic damper with a fuzzy controller to reduce the vibrations of an irregular hard structure under near and near earthquakes has been investigated. In the present study, the performance of a magnetic damper with the fuzzy controller to reduce the vibrations of an irregular stiffness structure under near and far field earthquakes has been investigated. The capacity of the introduced magnetic damper is equal to 1000kN, which is installed in the first floor between the floor level and the ceiling level of the first floor. The fuzzy system is designed based on the relative speed of the two ends of the damper to determine the relative speed of the amount of voltage and, consequently the control force that enters the structure. Three different types of irregularities in height, including hardness irregularities with a coefficient of 60%, are used in a 10-story structure and are modeled in the OpenSees software. These irregularities have been investigated in three different elevation locations including the lower half of the structure height (floors 1 to 5), the lowest floor (1st floor) and the middle floor of the structure (5th floor). Based on the numerical analyzes performed for these structures under the excitation of near and far field earthquakes, the residual displacement is reduced by an average of 23.15% and 45.64%, respectively. In addition to the improvement of criteria such as maximum displacement, base shear and moment in both types of earthquakes, the most improvement occurred in the irregular structure of the first floor and the least for the middle floor. In addition to improving criteria such as maximum displacement, base shear, and moment in both types of earthquakes, the most improvement occurred for the irregular structure on the first floor and the least for the irregular structure in the middle floor.

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References

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Amirkabir Journal of Civil Engineering
Volume 54, Issue 1
April 2022
Pages 191-208

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