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Apr 4, 2017
Stability of Steel Columns in Steel Concentrically Braced Frames Subjected to Seismic Loading
Authors: Guillaume Toutant [email protected], Yasaman Balazadeh Minouei [email protected], Ali Imanpour [email protected], Sanda Koboevic [email protected], and Robert Tremblay [email protected]Author Affiliations
Publication: Structures Congress 2017
Abstract
Lateral loads primarily induce axial loads in members of steel concentrically braced frames but columns may also be subjected to drift induced bending moments that may affect their strength and stability. The article discusses three examples of CBF columns that are subjected to combined axial compression and bending moments in structures under severe seismic ground motions: columns at an intermediate level where soft-story response develops in an existing seismically deficient X-bracing, fixed base columns at the first level of a well-proportioned multi-story X-bracing system, and columns in multi-tiered braced steel frames. Nonlinear dynamic analysis of the columns is performed to examine their stability response under axial and bending demands. In the first two cases, the results indicate that bending moments have limited effects on the global stability of the columns. Conversely, columns in multi-tiered frames must be designed to resist the expected combined axial and flexural demands in order to prevent column instability.
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© 2017 American Society of Civil Engineers.
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Published online: Apr 4, 2017
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Graduate Student, Group for Research in Structural Engineering, CGM Dept., Polytechnique Montreal, P.O. Box 6079, St. Centre-ville, Montreal, QC, Canada H3C 3A7. E-mail: [email protected]
Ph.D. Candidate, Group for Research in Structural Engineering, CGM Dept., Polytechnique Montreal, P.O. Box 6079, St. Centre-ville, Montreal, QC, Canada H3C 3A7. E-mail: [email protected]
Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Alberta, Edmonton, AL, Canada T6G 1H9. E-mail: [email protected]
Assistant Professor, Group for Research in Structural Engineering, CGM Dept., Polytechnique Montreal, P.O. Box 6079, St. Centre-ville, Montreal, QC, Canada H3C 3A7. E-mail: [email protected]
Professor, Group for Research in Structural Engineering, CGM Dept., Polytechnique Montreal, P.O. Box 6079, St. Centre-ville, Montreal, QC, Canada H3C 3A7. E-mail: [email protected]
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