Design Criteria

Check limit states using the Strength I and Service I load combinations. Check distribution of reinforcement as required in Article 5.6.7 using Class 1 exposure for moderate exposure conditions and Class 2 exposure in areas where de-icing agents are frequently used or where contact with salt spray is possible. Limit tensile stress in steel reinforcement, fss under Service I load combination to 0.6 fy
Check Article 5.6.3.3 for minimum reinforcement.
For reinforced concrete straddle bents, check the calculated shear, using the Service I Load Combination, against the resistance from Equation C5.8.2.2-1.
For multi-column bent caps, take design negative moments at the center line of the column. For hammerhead bents and multi-column bent caps with columns 4 ft. wide or wider, take design negative moments at the effective face of the column.
Minimize the number of stirrup spacing changes.
Except for hammerhead bents, shear need not be considered in cantilever regions unless the distance from center of load to effective face of column exceeds 1.2d. Provide stirrups at 6- in. maximum spacing.
For typical multi-column bent caps supporting multiple beams, strut-and-tie modeling provisions of Articles 5.8.2 need not be considered. For bent caps supporting girders on high load multi rotational (HLMR) bearings or girders with large reaction forces that are defined as deep components according to Article 5.2, use the strut-and-tie design.