Military

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

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).

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.