Abstract
Wood poles are among key components of the overhead grid infrastructure that are highly vulnerable to wind hazards. In coastal regions where hurricanes are often accompanied with a storm surge, in addition to high wind pressure, poles may experience significant surge and wave loads with the potential of triggering multiple failure mechanisms. However, multihazard pole fragility models that consider various modes of failure are lacking. This paper proposed a set of parameterized fragility models that are a function of wind-, surge-, and wave-related intensity measures and properties of poles. For this purpose, a design of experiment was conducted to generate realizations of intensity measures and pole-specific deterministic and uncertain parameters. For each realization, the state of survival/failure of pole was estimated for each mode of failure. Subsequently, for each class of pole and soil type, a logistic regression was carried out to generate fragility models for pole rupture at the ground line and pole overturning due to foundation failure. The results indicated that both pole rupture and foundation failure can be significant modes of failure conditioned on the type of soil. For example, for medium-strength cohesive soils, both modes of failure were significant, whereas for very-stiff-strength cohesive soils, pole rupture was the dominant mode of failure. The results of this study are key for risk and resilience analysis of coastal electric power systems and provide useful insights for decision making and risk management processes.
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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
This research was conducted as part of the National Institute of Standards and Technology (NIST) Center of Excellence for Risk-Based Community Resilience Planning under Cooperative Agreement 70NANB15H044 and 70NANB20H008 between the NIST and Colorado State University. The content expressed in this paper are the views of the authors and do not necessarily represent the opinions or views of NIST. The third author was supported in part by Lichtenstein endowment at the Ohio State University.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 148 • Issue 6 • June 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 10, 2021
Accepted: Dec 8, 2021
Published online: Mar 31, 2022
Published in print: Jun 1, 2022
Discussion open until: Aug 31, 2022
ASCE Technical Topics:
- Analysis (by type)
- Building materials
- Coastal engineering
- Coastal processes
- Coasts, oceans, ports, and waterways engineering
- Disaster risk management
- Energy infrastructure
- Engineering fundamentals
- Engineering materials (by type)
- Failure analysis
- Failure modes
- Forensic engineering
- Foundations
- Geotechnical engineering
- Infrastructure
- Lifeline systems
- Materials engineering
- Mathematics
- Parameters (statistics)
- Power transmission poles
- Risk management
- Statistics
- Storm surges
- Structural engineering
- Wood and wood products
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