Geometric Constraints

Cap depth cannot be less than cap width unless the cap is widened for the purposes of:

meeting minimum support length per Article 4.7.4.4

accommodating a cap to column connection when one or both elements are precast

satisfying vertical clearance needs to a lower roadway

For bents supporting Tx70 girders, use a cap width of at least 4.00 ft. as well as 42 in. columns and drilled shafts as a minimum.

For bents supporting U40 or U54 beams, use a cap width of at least 3.25 ft. as well as 36 in. columns and drilled shafts as a minimum.

For all other structure types refer to the bridge standard drawings for minimum cap widths.