Analysis and Design Methods for Improved Stability of Two-Tiered Steel Eccentrically Braced Frames with Continuous I-Shaped Links
Publication: Journal of Structural Engineering
Volume 150, Issue 9
Abstract
A set of seismic analysis and design requirements are presented to improve seismic stability of steel two-tiered eccentrically braced frames (EBFs) with I-shaped link beams. The proposed requirements include strength, stability, and stiffness provisions for braces, intermediate beams, and columns. In particular, these requirements aim to make use of intermediate beams to limit out-of-plane deformation of diagonal braces, torsionally brace the link beam in the intermediate level using diagonal braces, utilize column stiffness and strength to brace the intermediate beam out-of-plane, estimate and account for in-plane bending demands of the columns due to uneven yielding of the links, and control inelastic link rotation. The proposed special analysis and design requirements for two-tiered steel EBFs prevent excessive out-of-plane deformation of the intermediate beam and columns, promote sequential yielding of link beams, and limit inelastic rotation of the link in the tier experiencing the largest lateral deformation. The proposed requirements are demonstrated for a case study two-tiered EBF. Nonlinear static and dynamic analyses are performed to evaluate the seismic response of the case study frame against the frame designed without special design provisions and to validate the proposed requirements.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
Financial support for this research is provided by the Natural Sciences and Engineering Research Council (NSERC) of Canada and the Canadian Institute of Steel Construction (CISC). The first author acknowledges financial support from the CISC through the 2019 Kulak Scholarship. The authors would like to express their thanks to Dr. Yasaman Balazadeh Minouei, and Prof. Taichiro Okazaki of Hokkaido University for sharing test data.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 150 • Issue 9 • September 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jul 4, 2023
Accepted: Jan 29, 2024
Published online: Jul 2, 2024
Published in print: Sep 1, 2024
Discussion open until: Dec 2, 2024
ASCE Technical Topics:
- Beam columns
- Beams
- Bracing
- Case studies
- Columns
- Construction engineering
- Construction methods
- Earthquake engineering
- Engineering fundamentals
- Frames
- Geotechnical engineering
- Methodology (by type)
- Research methods (by type)
- Seismic design
- Seismic tests
- Steel frames
- Structural engineering
- Structural members
- Structural systems
- Tests (by type)
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