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Bay Area Earthquake Alliance Meeting22 July 2010
New Developments in Residential Retrofit Strategies
Kelly Cobeen, S.E.Wiss Janney Elstner Associates, Inc.
New Developments in Residential Retrofit Strategies - 22 July 2010
Outline
• Wood Frame Soft Story Retrofits
• Anchorage to Foundations and 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
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
• Plywood or OSB shear walls• Steel moment frames• Cantilevered columns• Proprietary systems
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
Cantilevered Columns
New Cantilevered
Columns
Existing Wood
New Foundation
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 Wood-Frame 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
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• 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