نوع مقاله : یادداشت فنی
نویسندگان
دانشکدهی مهندسی عمران، دانشگاه تربیت دبیر شهید رجایی تهران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
One of the most economical and fast ways in rehabilitation is the use of energy dissipaters in the format of additional dampers. The friction damper is acommon damper used in a wide range of applications, due to its dynamic behavior
and manner of working. In this paper, we will discuss the effects of the use of a mounted friction damper at the junction of a chevron brace with a floor beam.
For this purpose, two frames were designed, a bar frame and an equipped frame, which is of two types: same and story shear ratio distributed. The most important part of friction damper design is determination of optimum slip load.
So, frames equipped with a damper in a domain of different slip loads were analyzed using Perform 3D. And the load with the least answer of the structure was chosen as the optimum slip load of the damper. After designing the damper, time history analyzed each of the bar frames and equipped frames. The results of the analyses of the two frames, including absolute displacement, story share, input, strain and dissipated energy, axial force of columns, hinges and inelastic performance levels, were compared.
The results show that the use of a damper in the same distribution could reduce story displacement between 47.28
to 60.71 percent, and story shear ratio could reduce story displacement between 60.7 to 69.29 percent. Furthermore brace shear force in the same distribution reduces 28.7%, while, in shear ratio distribution, reduced 52.3%. All the
absorbed energy is reduced and dissipated energy is increased. Altogether, the shares of input and strain energies in the bar frame in comparison with the equipped frame are reduced. Because of the nonlinear behavior transmission of
structure members to the dampers, the number of hinges is reduced nearly to zero. In most cases, the equipped frames with safer indices show higher levels of performance.
کلیدواژهها [English]
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