Sliding versus Rubber Bearings: Exploring the Difference in Collapse Probability
Publication: Journal of Structural Engineering
Volume 149, Issue 7
Abstract
While collapse mechanisms have received significant attention for conventional buildings, they are less well understood for isolated buildings. Recently, there has been a more concerted effort to quantify the collapse probability of isolated structures; however, the majority of the research has explored the behavior of buildings isolated with concave sliding bearings, also referred to as friction pendulum (FP) bearings. Isolated buildings are expected to perform similarly under defined ground motion levels regardless of the type of bearing used. Yet the collapse probability of isolated buildings is directly dependent on the bearing failure characteristics, which differ by bearing type. Therefore, employing different isolation systems while following the same design guidelines may result in different collapse probabilities. In this study, the collapse probabilities of a 3-story buckling restrained brace frame isolated with either double-concave FP bearings or lead rubber bearings are compared. Different designs at maximum displacement are considered including use of moat walls versus allowing failure of the bearings (or impact of the restraining rims for FP bearings). In the absence of the moat wall, the system-level failure using both bearing types is triggered by exceeding defined displacement capacities. In contrast, with the moat wall, the system-level failure is dominated by either axial component-level failures or excessive yielding of the superstructure. However, when the moat wall limits ultimate displacement, the difference in collapse probabilities is small.
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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 authors would like to thank Dr. Masashi Yamamoto of the Takenaka Research and Development Institute for valuable comments on the study. We also would like to thank Mr. Yuta Kurokawa for assisting the structural design of seismically isolated building. Funding for this study was provided by Takenaka Corporation, which is gratefully acknowledged here.
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© 2023 American Society of Civil Engineers.
History
Received: Jul 12, 2022
Accepted: Mar 9, 2023
Published online: Apr 28, 2023
Published in print: Jul 1, 2023
Discussion open until: Sep 28, 2023
ASCE Technical Topics:
- Analysis (by type)
- Base isolation
- Buildings
- Continuum mechanics
- Displacement (mechanics)
- Earthquake engineering
- Engineering fundamentals
- Engineering mechanics
- Failure analysis
- Forensic engineering
- Geotechnical engineering
- Material failures
- Materials characterization
- Materials engineering
- Mathematics
- Probability
- Seismic design
- Solid mechanics
- Structural engineering
- Structural failures
- Structural mechanics
- Structural members
- Structural systems
- Structures (by type)
- Walls
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