This paper reports on a study comparing four detailing schemes for controlling end-region web-splitting cracks: end reinforcement per AASHTO LRFD specifications, large-diameter end reinforcement, vertical end-region posttensioning, and partial debonding of 45% of prestressing strands. Crack locations, lengths, and widths in 63 in. (1600 mm) deep Florida I-beams (FIB-63) were monitored during transfer and in the months following prestress transfer. Crack data were quantified and compared to determine the relative effectiveness of each scheme in controlling web cracking. Specimens were then load tested to determine the effect of each scheme on ultimate capacity. All three modified details resulted in reduced web cracking compared with the standard detail.
