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