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http://dx.doi.org/10.12989/eas.2021.21.2.147

Evaluation of seismic performance of rotational-friction slip dampers in near-field and far-filed earthquakes  

Borhan, Sahar (Civil Engineering Department, Science and Arts University)
Tajammolian, Hamed (Department of Civil Engineering, Yazd University)
Yazdian, Mehdi (Civil Engineering Department, Science and Arts University)
Publication Information
Earthquakes and Structures / v.21, no.2, 2021 , pp. 147-159 More about this Journal
Abstract
In this study, the performance of rotational-friction slip dampers in steel structures with different heights is investigated by the use of fragility curves. The use of dampers is one of the methods for vibration control of structures by simultaneously increasing both the structural stiffness and damping. Rotational-friction slip dampers are among the passive control devices that dampen the earthquake energy through their stable cyclic behavior. To study the performance of these devices in steel structures, 3, 6 and 9-story steel moment frame structures are designed, and the mentioned dampers are attached to the structure by Chevron braces. To account for the earthquake uncertainty, with the aid of incremental dynamic analysis (IDA), the damper-equipped structure is subjected to both near-field and far-field ground motion records. The acceleration and drift engineering demand parameters are selected as the functions to quantify the damage states, and the design, modeling and material properties uncertainties are considered in accordance with FEMA P-695. Evaluation of statistical results and comparison of the fragility curves, shows that the probability of failure at different damage states decreases when the dampers are added to the structure. This decrease is more remarkable in low-rise structures and near-fault ground motions.
Keywords
acceleration; drift; far-field; fragility curve; Incremental Dynamic Analysis (IDA); near-field; rotational-friction damper;
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