Section 10: Pretensioned Concrete Spread Box Beams (X-Beams)
When the clear roadway width is greater than or equal to 20.0 ft., use a distribution factor for two or more design lanes loaded only. Do not design for one lane loaded.
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Distribution Byzm Fiber Cold Splice Splice Tray Cable Joint Closure
21''x''48 PRETENSIONED PRESTRESSED CONCRETE BOX
R NOTES: LIVE LOAD DISTRIBUTION FACTORS USED FOR THE FLEXURAL DESIGN OF THE BEAMS WAS BASED ON PAST STUDIES CONDUCTED BY IADOT. HOWEVER, AASHTO
Section 9: Pretensioned Concrete Box Beams
Use shear keys for all box beam bridges. Do not consider composite action between beams and shear keys in computing live load distribution factors, nor for strength, stress, or deflection calculations.
AASHTO Load Distribution
I designed a bridge with prestressed concrete box beams and composite concrete deck about one year ago. We used Staadpro 2005 to model the deck using elements and the graphic
751.21 Prestressed Concrete Slab and Box Beams
The face of box beam voids shall be parallel to the skewed ends (also at 15 degrees) with a 4-inch chamfer at the acute corner. The face of voided slab beam voids shall not be skewed but the
27''x''48''REINFORCED''CONCRETE''BOX''BEAM''DATA
ONTROLLING LIVE LOAD DISTRIBUTION FACTORS ARE: 30''-0 SPAN MOMENT = 0.39 LANES / BEAM SHEAR = 0.70 LANES / BEAM 40''-0 SPAN MOMENT = 0.37 LANES / BEAM SHEAR = 0.69
Prestressed Concrete Box Beams Distribution Factor Spreadsheet
Since the exterior beam can be of a different width than the interior beam, the Live Load Distribution Factors need to be calculated for an interior beam that has the same width as the exterior beam.
751.21 Prestressed Concrete Slab and Box Beams
Draping (aka harping, deflecting, or raising) strands permits the designer to extend the span limits of prestressed beams by reducing the tensile stresses near the top ends of the beams.
GUIDE FOR GDOT BOX BEAM BASIC DRAWINGS AND DESIGN
The following tables provide information to be used in developing Box Beam bridge plans. DC and DW loads are provided to aid in determining the bearing load of each beam.
BeamBox 125 Amp 8-Space Indoor Main Lug Load Center
This 125 Amp 8-Space Main Lug Load Center is designed to deliver reliable and efficient power distribution for residential and light commercial electrical systems.