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Appendix I

Superstructure Design Examples

This appendix contains superstructure design examples. Refer to Chapter 6 for a detailed discussion of the equations.

NOTATIONS

I-1. This appendix contains superstructure design examples for a bridge using the analytical procedure. The following notations are used in this appendix:



TIMBER-STRINGER SUPERSTRUCTURE WITH A TIMBER DECK

I-2. Table I-1 shows the procedure for designing a timber-stringer bridge with a timber deck. Design information, materials, and allowable stresses needed to construct this bridge are listed below.

  • Class 50, two lanes, 12-foot-span timber deck.
  • Douglas fir (dense, select structural; no information on splits), rectangular sections only.

I-3. The final design for this bridge is as follows:

  • Stringers: eight (each 18 x 24 inches).
  • Deck: laminated (2 x 12 inches).
  • Treadway: 2- x 12-inch planks.
  • Curbs and handrails: standard design.
  • Timber: Douglas fir (dense, select structural).

STEEL-STRINGER SUPERSTRUCTURE WITH A CONCRETE DECK

I-4. Table I-2 shows the procedure for designing a steel-stringer bridge with a concrete deck. Design information, materials, and allowable stresses needed to construct this bridge are listed below.

  • Class 70, 2 lanes.
  • Nominal sizes of all beams in Table D-2.
  • Curb and handrail timber.
  • 3,000 psi concrete.
  • Grade-40 rebar for concrete deck.



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