Optimum Configuration of Friction Dampers in Buildings Elevations

Saeid, Fatehi and Gholizad, Amin and Mohebbi, Mohtasham (2016) Optimum Configuration of Friction Dampers in Buildings Elevations. Masters thesis, University of Mohaghegh Ardabili.

Text (توزیع بهینه خصوصیات میراگرهای اصطکاکی دورانی در طبقات ساختمان) Saeid Fatehi.pdf Download (871kB)

Abstract

Abstract: In the conventional methods of designing the structures, damping in structure is developed by the non-linear mechanisms in the beam-column. In the recent years, the use of the energy absorbing devices in order to control the seismic vibrations and preserve the structural elements is suggested. In this regard using the friction rotational damper is one of the appropriate instruments for controlling the seismic vibrations. In this research, one of the aims of the study is the sliding threshold moment optimization of the friction rotational damper applying Genetic Algorithm in order to structural responses reduction under the influence of various earthquakes. For achieving this goal, two-dimensional frames of four, eight and twelve class has been considered and by solving the equation of the structural motion using the state-space structure, the structure responses in cases of uncontrolled and controlled ones by the friction rotational damper are achieved. Then by using of Genetic Algorithm and synchronic minimizing of the three various objective functions, the optimal value of the sliding threshold moment of the dampers within variable and uniform distributions in the height of the structure will be obtained. The obtained results of the both distributions cases show that the variable and uniform optimal distribution of the sliding threshold moment of the dampers has led to their better performance in reducing the vibration responses. Keywords: Friction Damper, Multi-objective optimization, Genetic Algorithm, Moment slip threshold

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