Abstract
Coupling beams in shear wall and frame–shear wall systems are structural fuses that undergo significant inelastic deformation and absorb earthquake input energy. However, severe damage to coupling beams can disrupt building functions and have substantial repair costs. This study proposes frictional steel truss coupling beams (FTCBs) that aim to resolve these issues. The truss configuration is advantageous because it decouples shear and bending demands and facilitates pipeline layout. Shear-critical FTCBs (SFTCBs) adopt a smaller span-to-height ratio and place friction dampers in the diagonal webs, while bending-critical FTCBs (BFTCBs) adopt a larger span-to-height ratio and place friction dampers in the bottom chords. Quasi-static tests were conducted to validate the seismic performance of the FTCBs. A traditional reinforced-concrete coupling beam (RCCB) specimen was also tested for comparison. Results showed that FTCBs can realize damage control by concentrating inelastic deformation in friction dampers while keeping the main body of the steel truss and wall piers elastic. The FTCBs exhibited full and stable hysteretic behavior and enhanced energy dissipation capacity and replicability, which is difficult to achieve in RCCBs. Therefore, the FTCBs provide resilient alternatives to coupling beams over a range of span-to-height ratios.
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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
The research presented here was supported by the National Key Research and Development Program of China (Grant Nos. 2017YFC1500701 and 2017YFC0703605), National Science Foundation for Distinguished Young Scholars: 52125806, National Natural Science Foundation of China (Grant No. 51678106), Scientific Research Fund of Institute of Engineering Mechanics, CEA (Grant No. 2017A02), Fundamental Research Funds for the Central Universities (Grant No. DUT20JC05), and Heilongjiang Touyan Innovation Team Program: 3016.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 148 • Issue 9 • September 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Oct 1, 2021
Accepted: Apr 11, 2022
Published online: Jul 5, 2022
Published in print: Sep 1, 2022
Discussion open until: Dec 5, 2022
ASCE Technical Topics:
- Beams
- Continuum mechanics
- Coupling
- Damping
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Friction
- Methodology (by type)
- Research methods (by type)
- Shear walls
- Solid mechanics
- Steel beams
- Structural dynamics
- Structural engineering
- Structural members
- Structural systems
- Trusses
- Validation
- Walls
Authors
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