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Session IVa – "A Seismic Rehabilitation Agenda for Older Hazardous Concrete Buildings". Richard McCarthy Executive Director California Seismic Safety Commission. Mitigation of Seismic Risk in Older Concrete Buildings . EERI Concrete Building Coalition and NEESR Grand Challenge

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Session IVa – "A Seismic Rehabilitation Agenda for Older Hazardous Concrete Buildings"


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session iva a seismic rehabilitation agenda for older hazardous concrete buildings

Session IVa – "A Seismic Rehabilitation Agenda for Older Hazardous Concrete Buildings"

Richard McCarthy

Executive Director

California Seismic Safety Commission

mitigation of seismic risk in older concrete buildings

Mitigation of Seismic Risk in Older Concrete Buildings

EERI Concrete Building Coalition and NEESR Grand Challenge

Craig Comartin and Jack Moehle

project background

California, 1994

Turkey, 2003

“50% of the casualties are coming from 5% of the buildings.”

Kircher et al., “Estimated Losses due to a Repeat of the 1906 San Francisco Earthquake, Earthquake Spectra, 2006.

Project background
project background1

“Current guidelines identify most older concrete buildings as collapse risks.”

Craig Comartin, EERI President, 2006 Earthquake Conference

Project background

100

80

Percentage

Otani (1999)

60

40

Kobe, 1995

20

Erzincan, 1992

Luzon, 1990

0

Mexico City, 1985

Operational

Heavy

Collapse

Older Concrete Building Damage Rating

Otani, 1999

project thesis
Project thesis
  • Available guidelines are too conservative
    • most buildings are found inadequate
    • retrofit costs are high
  • This “always bad” message
    • is not credible
    • is impeding action
  • Improved procedures
    • can reduce the problem
    • can make retrofit programs feasible
  • What we learn can be translated to other building types and localities.
project aims
Project aims
  • Develop a consensus on the “killer” buildings
  • Demonstrate cost-effective retrofit
  • Identify mitigation policy alternatives
  • Promote active mitigation programs
project team

Stewart

Moehle

Comerio

May

Matamoros

Mosalam

Lopez

Hutchinson

Steele

Project Team

Disciplines:

 Seismic hazard

 Inventory

 Simulation

 Laboratory

 Field

 Building

 Regional

 Public policy

 EOT

Anagnos

Ramirez

Leadership

team

research program overview
Research program overview
  • Inventory
    • by structural type
    • by occupancy
    • by ownership
  • Participants
    • building and safety
    • housing agencies
    • structural engineers
    • real estate professionals
research program overview1
Research program overview
  • Testing to collapse
    • Multi-directional loadings
    • Realistic axial loads
  • Simple retrofit methods
research program overview2

Flexible/Weak Foundation

Research program overview
  • Systems studies
    • SFSI
    • Membrane effects
research program overview3

450

FEMA 356

400

Shear

350

300

Monotonic

250

Cyclic

Envelope

200

150

100

50

0

0

2

4

6

8

Displacement

Research program overview
  • Improved simulation
    • model development
    • simulation capability
  • Regional simulation
research program overview4
Research program overview
  • Crafting and evaluating appropriate policies
    • Identify different classes of the problem
      • Structural configuration
      • Occupancy
      • Economic conditions
    • Identify feasible mechanisms
    • Model risk reduction impacts
    • Evaluate economic impacts
      • Costs borne by building owners, governments, and other stakeholders
      • Regulatory considerations
collaborations with existing organizations
Collaborations with existing organizations
  • ASCE Standards Committees
  • American Concrete Institute
  • Applied Technology Council
  • EERI Concrete Coalition