improving damage models for critical...
TRANSCRIPT
Improving Damage Models for Critical Infrastructure
Jamie E. Padgett, Ph.D.
Associate Professor
Department of Civil and Environmental Engineering Rice University, Houston, TX
April 26, 2016
Sabarethinam Kameshwar Graduate Research Assistant
Carl Bernier Graduate Research Assistant
MOTIVATION Evolution of risk to infrastructure
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Evolving infrastructure risk
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Critical infrastructure systems
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BRIDGE INFRASTRUCTURE
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Failure modes
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Deck unseating
SH87 Rollover Pass Bridge Hurricane Ike
Scouring
Hurricane Ike Scenario Storm surge data courtesy of Dawson and Proft, UT Austin
Rollover Pass Bridge
Scour failure assessment framework
• Collect information on bridge and foundation – Bridge length – Size of columns
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– Foundation type – Soil type
Pile length
Column height
Column diameter
# of piles
Pile length
Scour failure assessment framework
• Gather flow data – ADCIRC simulations • Determine scour depth – SRICOS method for
time evolution of scour
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Scour depth
Scour failure assessment framework
• Place vehicles on bridge – Perform probabilistic analysis to assess failure
probability
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Is it safe?
Scour case study
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• Located in Freeport near Dow Chemical office
Scour case study
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• Located in Freeport near Dow Chemical office
Scour
TANK INFRASTRUCTURE
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Failure modes
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SH87 Rollover Pass Bridge Hurricane Ike
Buckling Floatation
Failure modes
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Buckling Floatation
PORTFOLIO OF TANKS IN THE HOUSTON SHIP CHANNEL
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Inventory of storage tanks
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• Inventory analysis through ArcGIS: o Tank dimensions and properties: aerial imagery o Tank height and bare earth elevation: LiDAR o Tank content: TCEQ database and HCAD parcel database
Evolution of inventory
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• Evolution from 1966 to 2014:
EVOLUTION OF RISK IN THE HOUSTON SHIP CHANNEL
Vulnerability assessment
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Vulnerability of tanks in the HSC
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• FEMA Base Flood Elevation for 0.2% chance of occurrence (≈21 ft)
Vulnerability of tanks in the HSC
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• Evolution of the number of tanks with high risk of failure (Pf ≥ 75%)
Potential hazardous spills due to storage tanks failure
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Location of major potential spills
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Summary
• New scour risk assessment framework for bridge infrastructures
• Scour fragility assessment of a case study bridge • Efficient fragility model for different AST failure
modes • Portfolio of ASTs from 1966 to 2014 • Time evolution of risk related to ASTs in HSC • Identification of critical areas in the HSC
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Future work • Extension of scour risk assessment framework for
portfolio of bridges to evaluate connectivity to critical energy infrastructures
• Integrated model of natural, physical, and social risks associated with oil infrastructure performance1.
• Quantification of the impact of risk mitigation strategies.
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1Co-PIs: P. Bedient, J. Elliot, R. Buono
