Effects of Seismic and Progressive Collapse Designs on the Vulnerability of RC Frame Structures
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Author(s)
Lin, Kaiqi
Li, Yi
Lu, Xinzheng
Guan, Hong
Griffith University Author(s)
Year published
2017
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Buildings are exposed to multiple natural hazards over their service lives. Multihazard analysis and design of building structures has become a research hotspot worldwide. For these structures, earthquake and progressive collapse are two of the most commonly encountered hazards. However, little research has been conducted to examine the effects of the seismic and progressive collapse designs on the resistance of buildings against multiple hazards. In this study, a series of six-story reinforced concrete (RC) frames are considered, and their seismic and progressive collapse designs are performed independently according to the ...
View more >Buildings are exposed to multiple natural hazards over their service lives. Multihazard analysis and design of building structures has become a research hotspot worldwide. For these structures, earthquake and progressive collapse are two of the most commonly encountered hazards. However, little research has been conducted to examine the effects of the seismic and progressive collapse designs on the resistance of buildings against multiple hazards. In this study, a series of six-story reinforced concrete (RC) frames are considered, and their seismic and progressive collapse designs are performed independently according to the corresponding design codes. Fragility curves are used to assess the seismic and progressive collapse resistance. The interactions between the two designs are discussed by analyzing the fragility curves and the collapse modes. Results show that the progressive collapse design of the RC frame may lead to an undesirable failure mode (i.e., strong-beam-weak-column) under earthquakes, which indicates that a seismic redesign is necessary subsequent to the progressive collapse design. Note that sequential use of different design codes for a structure may result in material waste yet a suboptimal structural performance. Therefore, a design method by individually considering different hazards is unsuitable for the multihazard prevention and mitigation of building structures. A comprehensive and integrated design method for multihazards is thus in great need. The outcome of this study will lay a foundation for future multihazard analysis and design of building structures.
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View more >Buildings are exposed to multiple natural hazards over their service lives. Multihazard analysis and design of building structures has become a research hotspot worldwide. For these structures, earthquake and progressive collapse are two of the most commonly encountered hazards. However, little research has been conducted to examine the effects of the seismic and progressive collapse designs on the resistance of buildings against multiple hazards. In this study, a series of six-story reinforced concrete (RC) frames are considered, and their seismic and progressive collapse designs are performed independently according to the corresponding design codes. Fragility curves are used to assess the seismic and progressive collapse resistance. The interactions between the two designs are discussed by analyzing the fragility curves and the collapse modes. Results show that the progressive collapse design of the RC frame may lead to an undesirable failure mode (i.e., strong-beam-weak-column) under earthquakes, which indicates that a seismic redesign is necessary subsequent to the progressive collapse design. Note that sequential use of different design codes for a structure may result in material waste yet a suboptimal structural performance. Therefore, a design method by individually considering different hazards is unsuitable for the multihazard prevention and mitigation of building structures. A comprehensive and integrated design method for multihazards is thus in great need. The outcome of this study will lay a foundation for future multihazard analysis and design of building structures.
View less >
Journal Title
Journal of Performance of Constructed Facilities
Volume
31
Issue
1
Copyright Statement
© 2017 American Society of Civil Engineers (ASCE). This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Subject
Civil engineering
Civil engineering not elsewhere classified
Other engineering