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Building Better Box Beam Bridges
Citation preview
5/25/2018 Building Better Box Beam Bridges
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Building BetterBox Beam Bridges
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Report Focus
1. Describe the state ofthe practice.
2. Report on lessonslearned.
3. Provide guidelines forbetter performance.
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Issues
Leaking Joints
Reflective DeckCracking
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AdjacentMember
Bridges
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AASHTO Box Beams
AASHTO Slab Beams
Types of Sections
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Box Beams
Slab Beams
Types of Sections
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Deck Bulb Tees
Types of Sections
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50,000 adjacent box bridges
(more than 8%)
9,000 spread box bridges
60 Years
Box Beam Bridges
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Spread Box Beam Bridges
NOT considered adjacent member bridges
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Non-Composite Superstructure
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Non-Composite Superstructure
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Non-Composite Superstructure
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Non-Composite Superstructure
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Non-Composite Superstructure
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Composite Superstructure
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Composite Superstructure
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Composite Superstructure
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Continuity
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Continuity
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LongitudinalJoints
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Shear Key Partial Depth
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Shear Key Full Depth
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Shear Key - TxDOT
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Shear Key - TxDOT
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Transverse Tie Rods
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Transverse Tie Rods
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Transverse Tie Rods
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Design
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Non-Composite
Vs.
Composite
Design
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Design
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Structural Overlay
OR
Sufficiently connected to act as a unit
EQUALS
Better Distribution between Beams
Live Load Distribution per AASHTO LRFD
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Live Load Distribution per AASHTO LRFD
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Shear Transfer Joints
Vs.
Shear-Flexure Transfer Joints
Sufficiently connected to act as a unit
Transverse Connection per AASHTO LRFD
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Transverse prestress amount
determined by strip method
or two-dimensional analysis
shall not be less than 0.25 ksi
through the key.
Transverse Connection per AASHTO LRFD
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Bearings
B i
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Bearings
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Inspection andMaintenance
Mi hi St d
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Michigan Study
Mi hi St d
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Michigan Study
Mi hi St d
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Michigan Inspection Handbook
Michigan Study
Mi hi St d
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Michigan Study
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Survey ofCurrent
Practice
D t C ll ti
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Data Collection
D t C ll ti
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A. General
B. Deck Slabs and Overlays
C. Box Beam ConstructionD. Keyways
E. Prestressing
F. Bearings
G. Experience
Data Collection
Q ti i R
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Questionnaire Response
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Case StudiesSummary
Case St dies
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TxDOT 9-Day Bridge
Colorado Weekend Bridge
Ohio 19-Day Box Girder Bridge BNSF Railway over Route 160,
Springfield, MO
MoDOT Route 100 over I-44,Gray Summit, MO
Case Studies
Route 100 over I 44
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Original Bridge
Route 100 over I-44
Route 100 over I 44
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Original Steel Design Layout
Route 100 over I-44
Route 100 over I 44
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VE ProposalAdjacent Box Beams
Route 100 over I-44
Route 100 over I 44
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Route 100 over I-44
BNSF over Route 160
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BNSF over Route 160
BNSF over Route 160
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BNSF over Route 160
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Conclusions
Conclusions
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Minimize Longitudinal Cracking
Water Penetration
De-Icing Chemicals
Ensure Long-Term Performance
Conclusions
Conclusions
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Larger Shear Keys, Full Depth
Increased Post-Tensioning Force
Composite Reinforced Concrete Deck
Design
Conclusions
Conclusions
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Minimize Skew if Possible
Three or Four Point Bearing System
Increase Concrete Cover
Design
Conclusions
Conclusions
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Use Polystyrene Forms for Voids
Properly Anchor Voids
Use of High Performance Concrete,Corrosion Inhibitors
Fabrication
Conclusions
Conclusions
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Sandblast Shear Keys ImmediatelyPrior to Grouting
Use Non-Shrink Epoxy Grout
PT Layout and Sequence
Construction
Conclusions
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