Techno Press

Steel and Composite Structures   Volume 24, Number 1, May20 2017, pages 37-52
Seismic collapse probability of eccentrically braced steel frames
Yongsheng Qi, Weiqing Li and Ningning Feng

Abstract     [Full Text]
    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.
Key Words
    seismic collapse; collapse probability; EBSF; IDA; rare earthquake
Changzhou Key Lab of Construction Engineering Structure and Material Properties, Changzhou Institute of Technology, No. 666, Liaohe Road, Changzhou City, Jiangsu Province, China.

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