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Research Needs ASCE 41-13: Seismic Evaluation and
Retrofit of Existing Buildings
2012 ACEHR Meeting
Robert Pekelnicky, SE
ASCE/SEI Seismic Rehabilitation Standards Committee
2012 ACEHR – ASCE 41 Research Needs
Inconsistencies
2012 ACEHR – ASCE 41 Research Needs
Combine ASCE 31 & ASCE 41
2012 ACEHR – ASCE 41 Research Needs
Benefits of ASCE 41-13
• Consistent Evaluation and Retrofit Provisions
• Explicit direction for existing buildings of different risk categories
• Explicit “New Design Code” equivalent performance objectives
• Greater consistency with ASCE 7
• Less conservative Tier 1 Life Safety provisions
• Updated technical provisions
2012 ACEHR – ASCE 41 Research Needs
Research Needs
2012 ACEHR – ASCE 41 Research Needs
Calibrate Collapse Prevention
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
Collapse Spectral Acceleration (g)
Col
laps
e Pr
obab
ility
.
Comprehensive Collapse DataLognormal Distribution
Does ASCE 41 CP provide 10% probability of collapse?
Figure courtesy of Charlie Kircher
2012 ACEHR – ASCE 41 Research Needs
Global Building Criteria
When the whole is better than the sum of its parts.
2012 ACEHR – ASCE 41 Research Needs
Revise Modeling Parameters
Most Parameters Unchanged in 15 years
2012 ACEHR – ASCE 41 Research Needs
Revise Modeling Parameters
Change to Parameters That Are Ideal For Nonlinear Response History
2012 ACEHR – ASCE 41 Research Needs
Concrete Shear Wall Criteria
Many feel current criteria is too conservative
2012 ACEHR – ASCE 41 Research Needs
Reinforced Masonry Wall Criteria
2012 ACEHR – ASCE 41 Research Needs
Liquefaction Effects on Buildings
2012 ACEHR – ASCE 41 Research Needs
Nonstructural Design Forces
2012 ACEHR – ASCE 41 Research Needs
Tier 1 & Tier 2 Calibration
A
B
C
D
E
11 10 9 8 7 6 5 4
Transfer girders@ Level 12
Columns of perimetermoment frameabove Level 14
Shear wallsbelow Level 14
WallD5-6
Plan View Elevation View
Figure courtesy of Ken Elwood
2012 ACEHR – ASCE 41 Research Needs
Material Variability & Knowledge Factor
Figure courtesy of Bruce Ellingwood
2012 ACEHR – ASCE 41 Research Needs
Method to Assess Killer Buildings
From Beca 2011
2012 ACEHR – ASCE 41 Research Needs
Concrete Encased Steel with & without Brick Infill
2012 ACEHR – ASCE 41 Research Needs
Concrete Frames with Brick Infill
Nondestructive Testing
More Nonductile Concrete Research
Research Needs ASCE 41-13: Seismic Evaluation and
Retrofit of Existing Buildings
2012 ACEHR Meeting
Thank you…any questions?
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