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Structural Engineering and Mechanics Volume 39, Number 5, September10 2011 , pages 717-732 DOI: https://doi.org/10.12989/sem.2011.39.5.717 |
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Evaluation of performance of eccentric braced frame with friction damper |
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J. Vaseghi Amiri, B. Navayinia and S. Navaei
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| Abstract | ||
| Nonlinear dynamic analysis and evaluation of eccentric braced steel frames (EBF) equipped with friction damper (FD) is studied in this research. Previous studies about assessment of seismic performance of steel braced frame with FD have been generally limited to installing this device in confluence of cross in concentrically braced frame such chevron and x-bracing. Investigation is carried out with three types of steel frames namely 5, 10 and 15 storeys, representing the short, medium and high structures respectively in series of nonlinear dynamic analysis and 10 slip force values subjected to three different earthquake records. The proper place of FD, rather than providing them at all level is also studied in 15 storey frame. Four dimensionless indices namely roof displacement, base shear, dissipated energy and relative performance index (RPI) are determined in about 100 nonlinear dynamic analyses. Then average values of maximum roof displacement, base shear, energy dissipated and storey drift under three records for both EBF and EBF equipped with friction damper are obtained. The result indicates that FD reduces the response compared to EBF and is more efficient than EBF for taller storey frames. | ||
| Key Words | ||
| friction damper (FD); slip load; nonlinear dynamic analysis; performance indices | ||
| Address | ||
| J. Vaseghi Amiri, B. Navayinia and S. Navaei: Department of Civil Engineering, Babol University of Technology, Shariati Avenue, P.O. Box 47144-484 Babol, Iran | ||