Protecting Infrastructure: The Role of Standards John Hooper Director of Earthquake Engineering...
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Protecting Infrastructure: The Role of Standards John Hooper Director of Earthquake Engineering Magnusson Klemencic Associates
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Transcript of Protecting Infrastructure: The Role of Standards John Hooper Director of Earthquake Engineering...
Protecting Infrastructure:The Role of Standards
John HooperDirector of Earthquake EngineeringMagnusson Klemencic Associates
John HooperDirector of Earthquake EngineeringMagnusson Klemencic Associates
Haiti—January 12, 2010 Over 220,000
casualties
Over 300,000 homes damage/destroyed
Over 1.5 M people affected
No Codes or Standards
MW 7.0
MW 8.8
Chile—February 27, 2010 Under 500 casualties
Estimated damage: $30B US
Building Codes and Standards similar to US
Performance of Chilean Buildings Post 1985
Buildings that collapsed: 4 (approximately) Buildings to be demolished: 50 (estimated) Number of buildings 9+ stories: 1,939 Failures of 9+ stories: 2.8%
Crushed Concrete Walls at Transition Zones
Poorly Detailed Concrete Walls
Christchurch—February 22, 2011 181 deaths Estimate damage: $16B Aftershock intensity
exceeded the initial earthquake
Modern building codes and standards
MW 6.3
Transect of approximately 300 buildings was accurate for nearly 4000.
Grand Chancellor- Reinforced concrete- 19 stories- mid-1980s- Core wall (up to 7th story)- Perimeter frame (above 7th story)
Courtesy of Dr. Ken Elwood and EERI
Grand ChancellorSouth FaceEast Face
Courtesy of Dr. Ken Elwood & EERI
Building Codes and Standards: New Buildings
Building Codes and Standards: New Buildings
Building Codes and Standards: New Buildings
Building Codes and Standards: Existing Buildings
Building Codes and
Standards: Existing Buildings
Building Codes and
Standards: Existing Buildings
Building Seismic Performance Matrix
Building Seismic Performance Matrix
Frequent Earthquakes
(25-50 years)
Design Earthquake
(300-600 years)
MaximumConsidered Earthquake
(1000-2500 years)
Gro
un
d M
oti
on
Levels
Building Seismic Performance Matrix
Building Performance Levels
Operational Immediate Occupancy
Life Safe
Collapse Prevention
Frequent Earthquakes
(25-50 years)
Design Earthquake
(300-600 years)
MaximumConsidered Earthquake
(1000-2500 years)
Gro
un
d M
oti
on
Levels
Building Seismic Performance Matrix
Building Performance Levels
Operational Immediate Occupancy
Life Safe
Collapse Prevention
Frequent Earthquakes
(25-50 years)
Design Earthquake
(300-600 years)
MaximumConsidered Earthquake
(1000-2500 years)
Gro
un
d M
oti
on
Levels New Buildings/Basic Retrofit Objective
Building Seismic Performance Matrix
Building Performance Levels
Operational Immediate Occupancy
Life Safe
Collapse Prevention
Frequent Earthquakes
(25-50 years)
Design Earthquake
(300-600 years)
MaximumConsidered Earthquake
(1000-2500 years)
Gro
un
d M
oti
on
Levels New Essential Facilities/Enhanced Retrofit Objective
New Buildings/Basic Retrofit Objective
Other Infrastructure Codes & Standards
Bridges Life safe performance, on par with buildings
Lifelines (water, sewer, gas, power, etc.) No consistent, national standards Performance will be inconsistent
Summary
Building Codes and Standards (and their enforcement) make a difference
Continued Code/Standard updates are essential Analysis Physical Research Earthquake Reconnaissance
Need to establish consistent standards for Lifelines
Is Life Safety Performance adequate?
