All details on both tub girders, with the exception of drain holes in the bottom flange, and details on the bracing members shall have a fatigue resistance based on Detail Category C′ or higher. Drain holes in the bottom tension flange shall be located at least 20 ft. from the location of the maximum tensile stress in the flange determined using the Strength I load combination.

Positive restraint and adequate support lengths shall be provided to keep the superstructure on the substructure after the assumed fracture event. Bearings need not be evaluated for this limit state

Structurally continuous barrier railings with a minimum height of at least 32 in. shall be provided and should be considered to be structurally active for the analysis at the Extreme Event III limit state as permitted in this Section.