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Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates, Inc.

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Page 1: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

Bay Area Earthquake Alliance Meeting22 July 2010

New Developments in Residential Retrofit Strategies

Kelly Cobeen, S.E.Wiss Janney Elstner Associates, Inc.

Page 2: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

Outline

• Wood Frame Soft Story Retrofits

• Anchorage to Foundations and Cripple Wall Bracing

Page 3: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

CAPSS

Page 4: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

What Makes the Building Vulnerable?

Page 5: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

What Makes the Building Vulnerable?

Page 6: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

What Makes the Building Vulnerable?

Page 7: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

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

Page 8: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

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

Page 9: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

Plywood or OSB Shear Walls

Page 10: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

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

Page 11: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

Steel Moment Frames

Page 12: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

Cantilevered Columns

New Cantilevered

Columns

Existing Wood

New Foundation

Page 13: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

Cantilevered Columns

Page 14: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

Proprietary Bracing Systems

Page 15: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

CAPSS Conclusions

Page 16: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

CAPSS Conclusions

Page 17: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

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

Page 18: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

Anchorage to Foundation & Cripple Wall Bracing

Page 19: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

Anchorage to Foundation & Cripple Wall Bracing

Page 20: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

What Makes the Building Vulnerable?

Page 21: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

What Makes the Building Vulnerable?

Page 22: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

Retrofit Methods

Page 23: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

Retrofit Methods

Page 24: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

In-Process: California Adoption of IEBC Appendix Chapter A3

Page 25: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

In-Process: California Adoption of IEBC Appendix Chapter A3

Page 26: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

In-Process: California Adoption of IEBC Appendix Chapter A3

Page 27: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

In-Process: CEA Residential Retrofit Brace and Bolt (R2B2) Program

Manager RFQ

Page 28: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

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

Page 29: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

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

Page 30: Bay Area Earthquake Alliance Meeting 22 July 2010 New Developments in Residential Retrofit Strategies Kelly Cobeen, S.E. Wiss Janney Elstner Associates,

New Developments in Residential Retrofit Strategies - 22 July 2010

Questions & Comments?


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