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Title |
Behavior of Midspan Splice Joints with Groove for Precast Concrete Beams
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Authors |
이승제(Seung-Jae Lee) ; 엄태성(Tae-Sung Eom) ; 강수민(Su-Min Kang) ; 김대진(Dae-Jin Kim) ; 김승일(Seung-Il Kim) |
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DOI |
https://doi.org/10.4334/JKCI.2020.32.6.565 |
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Keywords |
프리캐스트콘크리트; 보이음; 접합부; 휨실험; 합성콘크리트 precast concrete; beam splice; joint; flexural test; composite concrete |
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Abstract |
This study investigated the structural performance of a PC beam and its splice that was developed for the floor system of underground garage in apartment buildings. The PC beams were spliced on top of the PC wall column, or in midspan where the moment due to gravity load is almost zero. To improve the structural integrity at the splice joint, a groove was cut at the end of the PC beams, additional reinforcement was placed, and then in-situ concrete was filled. In addition, using in-situ concrete topping, the whole floor structure including the topping was designed as a continuous beam. Four point loading tests of four PC beam specimens were performed to investigate the structural performance at the splice joints with groove in midspan. The tests showed that the behavior of the PC beam joints was affected by the length of the grooves (or the bond resistance on the concrete interface inside the groove). The specimens with sufficient groove lengths showed the flexural strengths greater than the nominal strengths. On the other hand, the specimens with insufficient groove lengths showed concrete shear failure in the groove and topping as bond splitting cracks developed horizontally along the topping bars.
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