Steel and Composite Structures

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Seismic collapse probability of eccentrically braced steel frames

  • Qi, Yongsheng (Changzhou Key Lab of Construction Engineering Structure and Material Properties, Changzhou Institute of Technology) ;
  • Li, Weiqing (Changzhou Key Lab of Construction Engineering Structure and Material Properties, Changzhou Institute of Technology) ;
  • Feng, Ningning (Changzhou Key Lab of Construction Engineering Structure and Material Properties, Changzhou Institute of Technology)
  • Received : 2015.11.02
  • Accepted : 2017.02.28
  • Published : 2017.05.20
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Abstract

To quantitatively assess the safety against seismic collapse of eccentrically braced steel frame (EBSF) system, 24 typical EBSFs with K-shape and V-shape braces with seismic precautionary intensities 8 and 9 were designed complying with China seismic design code and relative codes to constitute archetype space of this structure system. In the archetype space, the collapse probability of the structural system under maximum considered earthquakes (MCE) was researched. The results show that the structures possess necessary safety against seismic collapse when they respectively encounter the maximum considered earthquakes corresponding to their seismic precautionary levels, and their collapse probabilities increase with increasing seismic precautionary intensities. Moreover, the EBSFs with V-shape braces have smaller collapse probability, thus greater capacity against seismic collapse than those with K-shape braces.

Keywords

Acknowledgement

Grant : Research on collapse probability and collapse mechanism of concentrically braced steel frames under strong earth-quakes

Supported by : Ministry of Housing and Urban-Rural Development

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