Connection system of precast beam and column with wet joint for short span bridge

Abstract

The objective of this study is to see whether or not there is a difference in the flexure behavior between three-supported continued segmental precast concrete beam joined with a cast in place. The formation of the bond is 90° vertical combined with 45° against the horizontal reinforcement, making use of the beam as the formwork. The monotonic pressure was applied constantly at one stage until the beams reached the ultimate. The result of the experiment showed that the flexure behavior of the three-supported continued pre-cast beams joined with the cast in place at the condition before cracks (elastic) had the same trend as that of monolith beam at the base area, as well as at the supporting points. However, before passing the yielding condition (the pulling reinforcer yielded), the precast beam had broken into pieces at the supported area, while the monolith beam had a trend in elastic condition, yielding condition, and ultimate condition. The ductility value of the pre-cast beam was 1.33 (at the base area) and 1,5 (at the supported area). The ductility value of the pre-cast beam was 1.0 at the base as well as at the supported area. This means pre-cast beams reach ultimate before the iron reinforcer yield (the ultimate structure is collapse). The cracking patterns showed that at the joined area the bonding failed to happen between the pre-cast beam and the bonding agent.