by: andrew devault, p.e. mo hassan, p.e. · 2019. 4. 3. · #780121 . d3 #580168 . d4 #860524 . d6...
TRANSCRIPT
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I‐4 Braided Ramp Bridge Deck
Cracking
BY:
Andrew DeVault, P.E.
Mo Hassan, P.E.
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General Project Info • FIN: 416518‐1‐52‐01 • Construction Cost is about $10M • Scope includes building a new 2-Span bridge and
interchange enhancements. • Original Contract time 564 Days • Contractor UIG • CCEI – Mehta & Assoc. • Started 2-13-12 • Final acceptance 1-17-14
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Structural System • 30’ wide • 2-200’ Spans • Continuous Steel beams with CIP composite deck
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1 2 3
Background
4/17/13 4/24/13
5/7/13
5/31/13 - Cracks discovered in 1A
5/10/13 1A
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Demolition •Many unknowns associated with the demolition (unloading the bridge) due to the fear of developing cracks elsewhere. •Contractor proposed Hydrodemo then later changed to conventional with light equipment
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Removing Deck
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Forming
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Steel in Place & Dry-Run
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Pouring
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Ramp Ready for Traffic
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TRANSVERSE CRACKING
AND POURING SEQUENCE
FIELD
THEORY
ALTERNATIVES
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DISCLAIMERS
1. DESIGN IS INVESTIGATING
2. CRACKING IS COMPLICATED
3. ONLY POURING SEQUENCE, HERE
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FIELD
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#920205, I-4 BRAIDED RAMP
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#920205 CRACKS NEAR END OF POUR No. 1
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#920205 CRACKS NEAR END OF POUR No. 1
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IS THE
BRAIDED RAMP
UNIQUE?
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#770090 RED BUG LAKE FLYOVER
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#770090 CRACKS NEAR END OF POUR No. 1
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#770090 CRACKS NEAR END OF POUR No. 1
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#770090 CRACKS NEAR END OF POUR No. 1
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#754115 FENTON/WILDWOOD OVER I-4
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#754115 CRACKS NEAR END OF POUR No. 1
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#750738 SR429 SB over US441
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#750739 SR429 NB over US441
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#750739 CRACKS NEAR END OF POUR No. 1
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#750739 CRACKS NEAR END OF POUR No. 1
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#750563(SB) & #750564(NB) SR423/434 JOHN YOUNG PARKWAY
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THEORY
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THEORY: POURING SEQUENCE INFLUENCES CRACK LOCATIONS
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POUR No. 1
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POUR No. 2
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POUR No. 3
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SUM OF ALL POURS
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SEQUENCE BY CONTRAFLEXURE
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#920205, I-4 BRAIDED RAMP
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1. ASYMMETRIC
2. WISCONSIN
3. FHWA
ALTERNATIVES
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ASYMMETRIC
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WISCONSIN INDEX 24.11, IDEAL POUR
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SIMULTANEOUS POURS (FHWA) http://www.fhwa.dot.gov/bridge/steel/pubs/if12052/designexample02.pdf
(70% SPAN) (70% SPAN) (60% SPAN)
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D5 ALONE?
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D1 #130089
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D2 #780121
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D3 #580168
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D4 #860524
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D6 #871001
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In Summary
Issue is not unique to Braided ramp project and D5 Pouring Sequence is not the only factor but a major one Recommend Raising awareness by: Sharing this info with FDOT Staff and Consultants Add to ERC check lists and develop verbiage
Recommend revising the Standard Spec 400-21 Concern with the demolition method/sequence. •
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QUESTIONS?