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Modifying Standard Drawings When Increasing Slab Top Clear Cover Checklist

Make all modifications listed below. No re-design or analysis of beams or girders is needed.

Prestressed Concrete I-girder or X-beam Standard Bridge

  1. Span Standard:
    • Change slab and slab overhang thickness dimension to 8 ½".
    • Change slab top clear cover to 2 ½".
    • Increase DL deflections 6 percent.
    • Add ½" to top of deck to top of girder dimension (or X dimension) and Y dimension.
    • Increase slab concrete CY volume by an amount equal to (0.00154 * Deck SF).
  2. Abutment Standard:
    • Add 0.2 CY to abutment concrete volume.
  3. PCP Standard:
    • Reduce the maximum allowed slab thickness increase in note 9 from 2" to 1 ½".
  4. IGCS or XBCS Standard:
    • Change slab thickness in note 2 and Section A-A to 8 ½".

Steel Beam Standard Bridge

  1. Span Standard:
    • Change slab and slab overhang thickness dimension to 8 ½".
    • Change slab top clear cover to 2 ½".
    • Add ½" to top of slab to top of beam dimension.
    • Increase slab concrete CY volume by an amount equal to (0.00154 * Deck SF)
  2. Abutment Standard:
    • Add 0.2 CY to abutment concrete volume.
  3. SBSD Standard:
    • Add ½" to Y dimension.
    • Increase DL deflections 6 percent.
  4. SBCS Standard:
    • Change slab thickness in note 3 and Section A-A to 8 ½".
  5. SBMD Standard:
    • Change clearance from top of deck to stud connector to 2 ½" in Stud Connector Detail.
  6. PCP Standard:
    • Reduce the maximum allowed slab thickness increase in note 9 for steel beams from 1" to ½".