Distribute the weight of one railing to no more than three beams.

Use section properties given on the Prestressed Box Beams standard drawings. For the composite section, use gross section properties.

Composite section properties may be calculated assuming the beam and composite concrete slab overlay have the same modulus of elasticity (for beams with $f_c^{\text{'}}$
< 8.5 ksi). When determining section properties, do not include haunch concrete placed on top of the beam. Section properties based on final beam and slab modulus of elasticity may also be used; however, this design assumption must be noted on the plans.

Live load distribution factors must conform to Article 4.6.2.2.2 and Article 4.6.2.2.3. Use:

Cross section (f) with bridges having a composite concrete slab
Cross section (g) with bridges having ACP applied directly to tops of beams, assuming beams are sufficiently connected to act as a unit.

Do not apply the skew correction factor for moment as suggested in Article 4.6.2.2.2e.

Do not take the live load distribution factor for moment or shear as less than the number of lanes divided by the number of girders, including the multiple presence factor per Article 3.6.1.1.2.