Bay Area Earthquake Alliance Meeting
22 July 2010
New Developments in
Residential Retrofit Strategies
Kelly Cobeen, S.E.
Wiss Janney Elstner Associates, Inc.
Outline
• Wood Frame Soft Story Retrofits
• Anchorage to Foundations and
Cripple Wall Bracing
New Developments in Residential Retrofit Strategies - 22 July 2010
CAPSS
New Developments in Residential Retrofit Strategies - 22 July 2010
What Makes the Building Vulnerable?
New Developments in Residential Retrofit Strategies - 22 July 2010
What Makes the Building Vulnerable?
New Developments in Residential Retrofit Strategies - 22 July 2010
What Makes the Building Vulnerable?
New Developments in Residential Retrofit Strategies - 22 July 2010
The CAPSS Report
• Characteristics, uses, locations of these
buildings
• The risk in doing nothing
• The consequences of retrofitting,
including performance and financial
impact
• Options to reduce the risk
• The recommended program
New Developments in Residential Retrofit Strategies - 22 July 2010
Bracing Elements for Retrofit
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Plywood or OSB shear walls
Steel moment frames
Cantilevered columns
Proprietary systems
New Developments in Residential Retrofit Strategies - 22 July 2010
Plywood or OSB Shear Walls
New Developments in Residential Retrofit Strategies - 22 July 2010
Bracing Elements for Retrofit
•
•
•
•
Plywood or OSB shear walls
Steel moment frames
Cantilevered columns
Proprietary systems
New Developments in Residential Retrofit Strategies - 22 July 2010
Steel Moment Frames
New Developments in Residential Retrofit Strategies - 22 July 2010
Cantilevered Columns
Existing Wood
New
Cantilevered
Columns
New
Foundation
New Developments in Residential Retrofit Strategies - 22 July 2010
Cantilevered Columns
New Developments in Residential Retrofit Strategies - 22 July 2010
Proprietary Bracing Systems
New Developments in Residential Retrofit Strategies - 22 July 2010
CAPSS Conclusions
New Developments in Residential Retrofit Strategies - 22 July 2010
CAPSS Conclusions
New Developments in Residential Retrofit Strategies - 22 July 2010
Coming Soon
• ATC-71-1 PROJECT: Development of
Simplified Guidance for Seismic
Rehabilitation of Weak-Story WoodFrame Buildings
•City of San Francisco proposed
mandatory retrofit ordinance and
ballot measure
New Developments in Residential Retrofit Strategies - 22 July 2010
Anchorage to Foundation &
Cripple Wall Bracing
New Developments in Residential Retrofit Strategies - 22 July 2010
Anchorage to Foundation &
Cripple Wall Bracing
New Developments in Residential Retrofit Strategies - 22 July 2010
What Makes the Building Vulnerable?
New Developments in Residential Retrofit Strategies - 22 July 2010
What Makes the Building Vulnerable?
New Developments in Residential Retrofit Strategies - 22 July 2010
Retrofit Methods
New Developments in Residential Retrofit Strategies - 22 July 2010
Retrofit Methods
New Developments in Residential Retrofit Strategies - 22 July 2010
In-Process: California Adoption of
IEBC Appendix Chapter A3
New Developments in Residential Retrofit Strategies - 22 July 2010
In-Process: California Adoption of
IEBC Appendix Chapter A3
New Developments in Residential Retrofit Strategies - 22 July 2010
In-Process: California Adoption of
IEBC Appendix Chapter A3
New Developments in Residential Retrofit Strategies - 22 July 2010
In-Process: CEA Residential Retrofit
Brace and Bolt (R2B2) Program
Manager RFQ
New Developments in Residential Retrofit Strategies - 22 July 2010
In-Process: CEA Residential Retrofit
Brace and Bolt (R2B2) Program
Manager RFQ
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Web portal
Screen and track retrofit contractors
Education source for local authorities
Education source and resources for homeowner
Financial incentive for homeowner
Quality review process for installed retrofits
Check eligibility of homes
Demonstration retrofits
New Developments in Residential Retrofit Strategies - 22 July 2010
Photo Credits
• Raymond B. Seed, Courtesy of National Information
Service for Earthquake Engineering (from CAPSS
report)
• Anderson Niswander Construction
• Ron Gallagher
• FEMA P-593
• Kelly Cobeen
New Developments in Residential Retrofit Strategies - 22 July 2010
Questions & Comments?
New Developments in Residential Retrofit Strategies - 22 July 2010