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Friberg Analysis : Distribution of Dowel Shear along Joint

Friberg Analysis : Distribution of Dowel Shear along Joint. Friberg Analysis : Max Neg moment occurs where Distance = 1.8 l from applied load (where shear = 0). JOINTS: Doweled To transfer load First used 1917–18 1930 wide spread use Dia, spacing & length varied widely Factors

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Friberg Analysis : Distribution of Dowel Shear along Joint

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  1. Friberg Analysis: Distribution of Dowel Shear along Joint

  2. Friberg Analysis:Max Neg moment occurs where Distance = 1.8 l from applied load (where shear = 0)

  3. JOINTS: Doweled • To transfer load • First used 1917–18 • 1930 wide spread use • Dia, spacing & length varied widely • Factors • Load transfer • Spacing of dowel • Size & spacing dowel • Joint type • Dowel bar bearing

  4. Dowel Looseness : space between dowel & concreteFactors:01.Coatings 02. Shrinkage 03. Air Voids04. Bearing Press

  5. Keep Looseness to a minimum01. Vibrate Concrete 02. Minimize bond breakers 03. Design bar size & spacing

  6. Timoshenko : dowel encased in Concrete

  7. Type Joint Recommended Type Joint Longitudinal Longitudinal Joints 1 and 5 Tied - # 11 Deformed No load Transfer – No Ties or Nominal Ties Bars at 2 in. on Ctrs 2, 3 and 4 Tied - #11 Deformed Bars at 12 in Ctrs. Transverse Transverse Dowelled Between Longitudinal Joints Dowelled with 11” at 2 in. Ctrs 1 and 5 with 2” at 12 in. Ctrs. Undowelled Outside Joints 1 and 5 DESIGN AIRCRAFTWide Bodied Aircraft(DC – 10, 747, etc.)

  8. DESIGN AIRCRAFT727 Class Type Joint Recommended Type Joint Longitudinal Longitudinal Joints 1 and 5 Tied - # 8 Deformed No load Transfer – No Ties or Nominal Ties Bars at 12 in. on Ctrs 2, 3 and 4 Tied - #11 Deformed Bars at 12 in Ctrs. Transverse Transverse Dowelled Between Longitudinal Joints Dowelled with 1-1/4” at 12 in. Ctrs 1 and 5 with 1-1/4” at 12 in. Ctrs. Undowelled Outside Joints 1 and 5

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