geosynthetic reinforced soil integrated bridge system
TRANSCRIPT
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GEOSYNTHETIC REINFORCED SOIL INTEGRATED BRIDGE SYSTEM
Michael Adams, Daniel Alzamora, Jennifer Nicks
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• Taking effective, proven and market–ready technologies and getting them into widespread use
www.fhwa.dot.gov/everydaycounts
EDC
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Definitions
• GRS - Geosynthetic Reinforced Soil – An engineered fill of closely spaced (< 12” )
alternating layers of compacted granular fill material and geosynthetic reinforcement
• IBS - Integrated Bridge System – A fast, cost-effective method of bridge support that
blends the roadway into the superstructure using GRS technology
GRS Fundamentals
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Cross-Section of GRS-IBS
GRS Fundamentals
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Summary of Benefits • Reduced construction cost (25 - 60%)
• Reduced construction time
• Construction less dependent on weather conditions
• Flexible design - easily field modified for unforeseen site conditions (e.g. obstructions, utilities, different site conditions)
• Easier to maintain (fewer bridge parts)
• QA/QC Advantages
GRS Fundamentals
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Site Selection
• Single span (currently 140 ft)
• 30 ft abutment height
• Grade separation
• Water crossings with low scour potential
• Steel or concrete superstructures
• New or replacement structures
GRS Fundamentals
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GRS
• Composite Structure
• Friction Connections
• Close Spacing
Composite Behavior
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Performance Tests
Before After
GRS Fundamentals
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Performance Test 2400 lb/ft @ 8” Spacing
Before After
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0.5 ksf (25 kPa)
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4.1 ksf (196 kPa)
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6.8 ksf (326 kPa)
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10.3 ksf (493 kPa)
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13.9 ksf (666 kPa)
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18.1 ksf (867 kPa)
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0
2
4
6
8
10
12
14
16
0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000
Ve
rtic
al s
trai
n (
%)
Applied load (psf)
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Performance Test Results
0
1
2
3
4
5
6
7
8
0 500 1000 1500 2000Vertical Stress (kPa)
Vert
ical
Str
ain
(%
)
FHWA pier
Vegas mini pier
Defiance mini pier
GRS performance test
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Vertical Deformation Continued
0
1
2
3
4
5
6
0 5 10 15 20 25 30
Ver
tica
l S
tra
in (
%)
Applied Vertical Load (ksf)
Envelope
Huber
Vine
Bowman
Stever
Glenburg
Design of GRS-IBS
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GRS IBS Reports
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CONSTRUCTION Youtube Video
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User Perspective Defiance County, Ohio
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Open to Traffic: 47 days
Construction Costs: 80’x32’-$266,000 - 2005
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Construction Costs: 28’x20’-$68,000 - 2008
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Construction Costs 28’x20’-$88,000 - 2009
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Construction Costs: 32’x10’-$51,000 - 2010
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Construction Costs: 28’x20’-$70,000 - 2010
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Construction Costs: 28’x20’-$65,000 - 2010
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Construction Costs: 28’x32’-$85,000 - 2010
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Construction Costs: 36’x20’-$71,000 - 2010
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Construction Cost: 140’x40’-$620,000 - 2009
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User Perspective St. Lawrence County, NY
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CR 12 - 40’x33’- Material Cost $160,000 Construction costs $240,000
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CR 24 - 47’x33’- Material Cost $110,500
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CR 31 - 56’x33’- Material Cost $165,000
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CR 35 - 67’x33’- Material Cost $180,500 Construction Cost $310,000
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CR 38 - 63’x32’- Material Cost $175,000
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User Perspective Huston Township, Pennsylvania
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User Perspective Ottawa County , Oklahoma
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User Perspective National Park Service
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Disney Bridge in Sequoia NP
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Strawberry Creek Great Basin National Park - NV
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PROGRESS TOWARD 2012 EDC GRS IBD GOALS
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2012 Deployment Goals
• December 2012:
– 30 bridges have been designed and/or constructed using GRS-IBS on the NHS within 20 states
– 75 bridges have been designed and/or constructed using GRS-IBS off the NHS
Steps to Move Forward
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CA
AZ
CO
NM
TX
OK AR
LA
MO KY
AL GA
FL
VA
OH
MI
VT AK
MT
NV
ME
WA
OR
UT
KS
ID WY
ND
SD
MN
NE
WI
IA
IL IN
MS
TN
SC
NC
WV
PA
NY
CT
NJ DE MD DC
MA NH
PR
HI
RI
State DOT Deployment
1
2
1
1
5
7
7
2
4
2
2
1
1
1 1
1
Total of 56 project in 28 states at some stage of development from conceptual to construction
1
1
1
1
1
1 1 1
1
1
2 3
1
1
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