Graves Avenue Bridge over I-4: How-To Manual Session 9 Tom Andres
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Graves Avenue Bridge over I-4: How-To Manual Session 9 Tom Andres
Session 9 Tom Andres FDOT Central Office Structures Design Graves Avenue Bridge over I-4: How-To Manual Topic Description Possible implementation Self Propelled Modular Transporters (SPMT’s) strategies on future FDOT projects. Speaker Biography BSCE University of Florida 20 years experience with the Florida Department of Transportation. Currently Area Engineer for Districts 4, 7 and Turnpike. Self-Propelled Modular Transporters (SPMT) Possible Future Strategies Possible SPMT Future Strategies Strategy 1: Composite Dead Load Designs Strategy 2: Span Reuse Concepts 1 SPMT: Strategy 1 – Composite Dead Load Designs Turnpike Over I-595 151’ AASHTO Type V SPMT: Strategy 1 – Composite Dead Load Designs Turnpike Over I-595 151’ AASHTO Type V 2 Strategy 1 – Composite Dead Load Designs SPMT: Strategy 1 – Composite Dead Load Designs Example - Possible Benefits %Diff := σ2 := σ2 σ1 ( σ2 − σ1) σ1 M S LL + bc M ⋅ 100 DL S ⎛ σ2 %Diff := ⎜ ⎝ σ1 σ1 := b ⎛ MLL M DL ⎞ ⎜ ⎟ + ⎜ S bc S ⎟ b ⎠ ⎝ := M LL+ M DL σ2 σ1 M ⎞ − 1 ⎟ ⋅ 100 ⎠ LL +M S DL bc S ⎞ ⎛ ⎜ M + M ⋅ bc ⎟ DL S ⎟ ⎜ LL b ⎠ ⎝ := (MLL + MDL) S bc σ2 σ1 S M ⎛⎜ DL bc ⎞ ⎟ 1+ ⋅ ⎜ M S ⎟ LL b ⎠ ⎝ := M 1+ DL M Tension at Bottom of Beam LL M S ⎞ ⎡⎛ ⎤ ⎢ ⎜ 1 + DL ⋅ bc ⎟ ⎥ M S ⎟ ⎢ ⎜⎝ ⎥ LL b ⎠ %Diff := ⎢ − 1⎥ ⋅ 100 M DL ⎢ ⎥ ⎢ 1+ M ⎥ LL ⎣ ⎦ 3 SPMT: Strategy 1 – Composite Dead Load Designs SPMT: Strategy 1 – Composite Dead Load Designs Span Length (L) L/2 L/2 Concrete Deck Jacks Typ. Prestressed Beam Deck Closure Pour Temporary Shoring Typ. 4 SPMT: Strategy 1 – Composite Dead Load Designs Jacks Typ. 1 2 3 Differential Settlement Between Temporary Supports 1 2 3 Consider Preloading Temporary Shoring SPMT: Strategy 1 – Composite Dead Load Designs Considerations: Beam Stability Off-site Fabrication vs On-site Temporary Bracing Temporary Supports Geometry Control Differential Settlement Shear Requirements May Govern Site Access Issues 5 SPMT: Strategy 2 – Span Reuse Concepts Florida is Predicted to Replace New York as the Third Largest State by 2030. Urban Bridges in Florida are Replaced Based on Highway Capacity Needs Well Before They Have Reached Their Useful Life. We Recycle Bridges SPMT SPMT: Strategy 2 – Span Reuse Concepts Interstate Widening Example Braided Ramps 6 SPMT: Strategy 2 – Span Reuse Concepts Interstate Widening Example Construct New Piers and End Bents Construct New Piers and End Bents SPMT: Strategy 2 – Span Reuse Concepts Interstate Widening Example Move Braided Ramps OutOutward to Make Room For Interstate Widening 7 SPMT: Closure Pour & Diaphragm Details Control Joint Hard Points Up-ward Thrust Deflected Shape SPMT: Closure Pour & Diaphragm Details B Mild Reinf. Formed Thru Holes Level Neoprene Pad B Section Thru Intermediate Girder 8 SPMT: Closure Pour & Diaphragm Details Prefab. Span CIP Control Joints Partial Height Diaphragm Long. Reinforcing Steel Closure SDG 4.2.6 Compressible Material Epoxy Grout Strand Protection Section B-B Bars 3D1 & 3D2 Optional Splice Epoxy Grout 2” CL Future I-4 Widening Project Incentive – Disincentive (I/D) to Reduce Construction Time and Traffic Impacts Cassadaga Road – I/D $7,500/day up to $150,000 max. – Bonus - $200,000 Total Project Completion – I/D $15,500/day up to $2,000,000 max. SPMT Contractor Alternates Span Installation Plan Composite Dead Load Design 9 SPMT- Another Useful Tool in the Toolbox SPMT SPMT: Questions 10