Abstract
During earthquakes, I-shaped beams (I-beams) in a braced structure are subjected to the flexural moment synchronized with reversed axial forces transmitted from buckling restrained braces. A prior study used the modified width-Thickness ratio to evaluate the rotation capacity of I-beams that failed by local buckling under alternating axial force. Generally speaking, I-beams in braced frames are designed with larger sections to resist severe stress conditions. The buckling mode might thereby be switched to web-shear buckling, leading to inaccurate estimation of the rotation capacity when using existing equations. For this study, a classification index of buckling mode is constructed considering axial force and plate interactions. Moreover, a novel index and formulas are proposed for evaluating the rotation capacity of I-beams under alternating axial forces, including buckling-mode transition effects.
Original language | English |
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Article number | 04020089 |
Journal | Journal of Structural Engineering (United States) |
Volume | 146 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2020 Jun 1 |
Keywords
- Braced structures
- I-beam
- Local buckling
- Rotation capacity
- Web-shear buckling
ASJC Scopus subject areas
- Civil and Structural Engineering
- Building and Construction
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering