PERFORMANCE OF OPTIMUM FRICTION TUNED MASS DAMPER CONNECTED TO MULTI-DEGREE OF FREEDOM STRUCTURES

سال انتشار: 1398
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 478

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شناسه ملی سند علمی:

SEE08_153

تاریخ نمایه سازی: 27 خرداد 1399

چکیده مقاله:

Present study investigates the performance and optimum parameters of friction tuned mass damper (FTMD) as a passive control device. This is done for multi-degree of freedom (MDOF) structures equipped with this damper and subjected to ground motion excitation. FTMD consists of mass, stiffness and friction mechanism created through contact surface between FTMD mass and the main structure which utilises benefits of both mass damper and friction damper. The best performance of structures equipped with this damper is obtained when optimum parameters of FTMD are used for its design. Therefore, optimum parameters of FTMD for a range of MDOF structures with different periods up to 3.0 seconds and different number of stories are calculated. To do so, particle swarm optimization (PSO) algorithm is considered as an efficient algorithm which has been used in similar investigations. Objective function in optimization problem is defined as maximum displacement of main structure as a factor which directly affects on safety and integrity of structures. To reach a general conclusion, systems are investigated under a set of 20 SAC project ground motion records. Studying convergence of the optimization process shows that PSO is a suitable algorithm in finding optimum FTMD parameters. In addition, optimum FTMD reduces main structure response properly. Optimum reduction is dependent on period of structures. Average amount of this reduction for different structures under SAC records is about 30% which is considerable. Optimum FTMD parameters vary with respect to main structure characteristics and mass ratio which is pre-selected similar to other studies because its optimum value is so high and non-practical. For flexible main structures, effectiveness of FTMD on reducing structural responses is higher.

کلیدواژه ها:

Tuned mass friction damper ، multi-degree of freedom ، Passive control ، Seismic analysis ، Particle swarm optimization algorithm

نویسندگان

Boshra Besharatian

Research Assistant, University of Isfahan, Isfahan, Iran

Hossain Tajmir Riahi

Assistant Professor, University of Isfahan, Isfahan, Iran