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CULVERT LOAD RATING & LOAD
TESTING
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* The Office of Structures and BridgesIowa Department of
Transportation
** Bridge Engineering Center
Iowa State University
[email protected]
515-239-1290
Ping Lu*, Scott Neubauer*, Brent Phares**, Ahmad Abu-Hawash*
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Acknowledgement
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What is Load Rating
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Why Do We Need Load Rating
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Guidelines for Culvert Load Rating
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Problems in Rating Older Culverts
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Reasons – Changes in Design Guidelines
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Dynamic Impact
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0 1 2 3 4 5 6 7 8 9
I m p a c t
Fill Depth - H (ft)
LRFD
Standard
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Live Load Distribution
!
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Live Load Distribution (Con’t)
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Live Load Distribution (Con’t)
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Lateral Earth Pressure (EH)
Standard SpecificationsLRFD & MBE
Before 1983 After 1983
EH
,+ ! .)/
0)1 2
-3 ./ 45672
.)/
!("189 0 ' (#189 0 60/30pcf
60/30pcf
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Earth Pressure used in Iowa Culvert
Standards
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Culvert Load Testing
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Live Load Testing
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EarthFill Sizes YearBuilt 1
605880 Boone
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Live Load Testing (Con’t)
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1-9 are 9 Strain Rosettes
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Live Load Testing - Results
!
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Live Load Testing - Results
!
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Results Discussion
Load Testing(k-in)
Standard(k-in)
LRFD(k-in)
Max M+ of Slab 6.1 47.5 49.9
Standard LRFD
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Conclusions
! M?
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Questions?
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Thank You!
