Damage Estimation for Buildings and Lifelines

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Damage Estimation forBuildings and Lifelines

• Brian Kehoe, S.E.
• Wiss, Janney, Elstner Associates, Inc.

2
General Building Stock Database Representation

• Aggregated on Census Tract Level
• 15 Basic Building Types
• Building Types Based on ATC 13
• Wood
• Steel
• Concrete
• Masonry
• Further Categorizations
• Height
• Design Level
• Quality

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General Building Stock Data

• Basic Supplied Data
• Square Footage by Occupancy
• Based on Publicly Available Information
• Data Manipulation
• Occupancy to Building Type Mapping
• Average Building Area by Occupancy Type
• Resulting Data
• Number of Buildings by Type
• Number of Buildings by Occupancy

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Occupancy to Building Type Mapping

• Default Mapping Schemes
• Same Scheme Applied to Each Census Tract
• By Region and by Age of Construction
• By State for Single Family Residential (R1)
• Custom Mapping
• Used to Improve Building Stock Data
• Simple Mapping Scheme Creation
• Detailed Mapping
• Based on Imported Data
• Based on Surveys
• Expert Opinions Needed

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Damage Modeling

• Building Damage Related to Displacement
• Capacity Curve For Each Building Type
• Ground Motion Determined From PESH Module For
  Each Census Tract
• PGA
• Spectral Acceleration at 0.2 seconds
• Spectral Acceleration at 1.0 seconds
• Building Response Calculated for Each Building
  Type In Each Census Tract Using Pushover Analysis
  (Nonlinear Static Procedure)

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Building Response Calculation
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Building Damage Levels

• Five Damage States Defined
• None
• Slight
• Moderate
• Extensive
• Complete
• Fragility Curves Relate Displacement to Damage
  States for Each Building Type
• Results Expressed in Percentage of Building in
  Each Damage State
• Damage Results Used for Calculating Economic
  Losses

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Site Specific Building Response

• Site Specific Response for Important Buildings
• Hospitals
• Schools
• Emergency Operations Centers
• User Defined
• Based on Ground Motion at Site Rather Than at
  Centroid of Census Tract
• Damage Results Used for Other Modules
• Sheltering
• Functionality

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Lifelines

• Categories
• Transportation
• Infrastructure
• Facilities
• Utilities
• Infrastructure
• Facilities
• Representation
• Linear Elements (eg Roads and Pipelines)
• Site Specific Elements (eg Buildings and Bridges)
• Distributed by Census Tract (eg Distribution
  Piping)

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Lifelines Data

• Default Data
• Fairly Complete Data for Highways and Highway
  Bridges
• Partial Data for Other Transportation Systems
• Limited Data for Utilities
• Additional Data
• Facility Location and Construction
• Considered Somewhat Proprietary
• Needed to Get Improved Results

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Lifelines Damage Assessment

• Site Specific Ground Motion from PESH Module
• Damage Assessment
• Similar Methodology to Building Damage
• Damage Based on PGA, PGV, or PGD
• Fragility Curves
• Separate Curves for Each Lifeline Component Type
• Additional Damage Calculations for Some
  Components
• Rate of Leakage and Breaks in Pipes
• Functionality of Utility Systems
• Results Used for Calculating Losses/Functionality