Seismic behavior of low-ductility concentrically-braced frames

J. Sizemore, A. Davaran, L. Fahnestock, R. Tremblay, E. Hines

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Current codes allow engineers in moderate seismic regions to ignore seismic detailing as long as they design the structure using R = 3. However, recent research has raised questions regarding the reliability of such systems. When subjected to the maximum considered earthquake seismic hazard, the collapse of these systems becomes inherently dependent on their reserve lateral load-resisting capacity. Several sources of reserve capacity in these structures have been identified: connections in the gravity framing system, connections in the braced frame system, column continuity, base fixity, and brace re-engagement. In this paper, the results of several parametric OpenSees studies are presented in order to evaluate the effect of these sources of reserve capacity in traditional R = 3 systems, with focus on a three-story prototype chevron concentrically-braced frame. Nonlinear, inelastic, static analysis, as well as nonlinear, inelastic, incremental dynamic analysis for a suite of earthquake ground motions was performed. Various limit states for these structures were identified, and failure of the welded connection between the brace and gusset plate was identified as the prominent event affecting collapse performance.

Original languageEnglish (US)
Title of host publicationStructures Congress 2014 - Proceedings of the 2014 Structures Congress
EditorsGlenn R. Bell, Matt A. Card
PublisherAmerican Society of Civil Engineers
Number of pages12
ISBN (Electronic)9780784413357
StatePublished - 2014
EventStructures Congress 2014 - Boston, United States
Duration: Apr 3 2014Apr 5 2014

Publication series

NameStructures Congress 2014 - Proceedings of the 2014 Structures Congress


OtherStructures Congress 2014
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Building and Construction
  • Civil and Structural Engineering


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