Reserve capacity and implications for seismic collapse prevention for low-ductility braced frames in moderate seismic regions

Larry Alan Fahnestock, E. M. Hines, R. Tremblay, C. Bradley, J. Nelson, T. Beland, A. Davaran, J. Sizemore

Research output: Contribution to conferencePaper

Abstract

Although there has been extensive research on achieving ductile behavior and robust performance for steel structures in high seismic regions, little is known about the behavior and performance for low-ductility steel structures that are prevalent in moderate seismic regions. The seismic lateral-force-resisting system recognized in ASCE 7 that is currently widely applied to steel structures in moderate seismic regions is the R=3 system, where no ductile detailing is required. While not explicitly stated, the viability of an R=3 system rests on the notion that there is some degree of reserve capacity within the system that allows design forces to be reduced when there is no ductile detailing. The present research is systematically studying reserve capacity and its effect on the seismic behavior and performance of low-ductility braced frames. Specific aspects of the research are: (1) modeling and full-scale testing of beam-column gravity connections with angles; (2) full-scale testing of nonductile brace connection limit states; (3) large-scale testing of multi-story braced frames with nonductile limit states; (4) nonlinear static and dynamic analysis of buildings with nonductile braced frames. In all cases, quantifying reserve capacity and establishing the effect of reserve capacity on the system behavior are emphasized. These results provide a valuable resource for design of low-ductility steel braced frame systems to provide seismic collapse prevention performance.

Original languageEnglish (US)
DOIs
StatePublished - Jan 1 2014
Event10th U.S. National Conference on Earthquake Engineering: Frontiers of Earthquake Engineering, NCEE 2014 - Anchorage, United States
Duration: Jul 21 2014Jul 25 2014

Other

Other10th U.S. National Conference on Earthquake Engineering: Frontiers of Earthquake Engineering, NCEE 2014
CountryUnited States
CityAnchorage
Period7/21/147/25/14

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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