FEMAHAZUS Risk Assessment Capabilities Project,

SCEC Presentation

Damage Estimation forBuildings and Lifelines

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

FEMAHAZUS Risk Assessment Capabilities Project,

SCEC Presentation

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

FEMAHAZUS Risk Assessment Capabilities Project,

SCEC Presentation

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

FEMAHAZUS Risk Assessment Capabilities Project,

SCEC Presentation

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

FEMAHAZUS Risk Assessment Capabilities Project,

SCEC Presentation

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)

FEMAHAZUS Risk Assessment Capabilities Project,

SCEC Presentation

Building Response Calculation

Performance Point

FEMAHAZUS Risk Assessment Capabilities Project,

SCEC Presentation

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

FEMAHAZUS Risk Assessment Capabilities Project,

SCEC Presentation

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

FEMAHAZUS Risk Assessment Capabilities Project,

SCEC Presentation

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)

FEMAHAZUS Risk Assessment Capabilities Project,

SCEC Presentation

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

FEMAHAZUS Risk Assessment Capabilities Project,

SCEC Presentation

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