Structural Engineering and Mechanics

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Seismic behavior factors of buckling-restrained braced frames

  • Kim, Jinkoo (Department of Architectural Engineering, Sungkyunkwan University) ;
  • Park, Junhee (Department of Architectural Engineering, Sungkyunkwan University) ;
  • Kim, Sang-Dae (School of Civil, Environmental and Architectural Engineering, Korea University)
  • Received : 2007.06.18
  • Accepted : 2009.08.18
  • Published : 2009.10.20
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Abstract

The seismic behavior of a framed structure with chevron-type buckling restrained braces was investigated and their behavior factors, such as overstrength, ductility, and response modification factors, were evaluated. Two types of structures, building frame systems and dual systems, with 4, 8, 12, and 16 stories were designed per the IBC 2003, the AISC LRFD and the AISC Seismic Provisions. Nonlinear static pushover analyses using two different loading patterns and incremental dynamic analysis using 20 earthquake records were carried out to compute behavior factors. Time history analyses were also conducted with another 20 earthquakes to obtain dynamic responses. According to the analysis results, the response modification factors turned out to be larger than what is proposed in the provision in low-rise structures, and a little smaller than the code-values in the medium-rise structures. The dual systems, even though designed with smaller seismic load, showed superior static and dynamic performances.

Keywords

Acknowledgement

Supported by : Korea Science & Engineering Foundation

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