UFC is one of the cementitious materials which have outstanding properties such as more than 200 MPa compressive strength, high ductility and durability. The permanent formwork for RC structures is one of the promising applications of UFC. This research is aimed to investigate the shear behavior of RC beams using a U-shaped UFC permanent formwork. Eight RC beams using a U-shaped UFC permanent formwork were tested by four-point bending test. The experimental parameters were the presence of shear keys at the internal surface of a UFC U-shaped permanent formwork, presence of screws and bolts, thickness of formwork, shear span to effective depth ratio and presence of stirrups. The experimental results indicated that a U-shaped UFC permanent formwork enhanced the shear capacity of RC beams more than twice compared to normal RC beams. In addition, the shear resistance mechanisms were investigated. By using a UFC formwork with shear keys and screwed bolts, the UFC formwork intercepted widening of diagonal cracks inside a RC part. Finally, the shear carried by a UFC permanent formwork was investigated. The proposed calculation method can provide a good agreement with the experimental values.
The experimental results and predictive equation for shear capacity of Perfobond strip (PBL) joint connection with cast-in-place UFC to develop UFC-PC hybrid girders are presented in this paper. The UFC-PC bridge consists of PC segment at both ends and UFC segment at the middle of the span. Push-out test of twelve specimens was conducted. The experimental parameters were thickness of PBL, diameter of the hole of PBL, diameter of transverse rebar, prestressing stress on connection part, and the ratio of spacing to diameter of PBL. The experimental results indicated that PBL with cast-in-place UFC connection was sufficient to transfer the shear forces between the two segments. The contributions to shear capacity in each term were clarified. In addition, the shear resisting mechanisms were investigated. By inducing prestressing stress on the connection part, the shear capacity drastically increased due to the friction resistance. Finally, the shear capacity equation for PBL with cast-in-place UFC connection was proposed. The proposed calculation method can provide a reasonable agreement with the experimental results.
<p>This paper presents innovative design and development of massive precast segmental concrete portal frame system applied for Red Line Mass Transit project in Bangkok, Thailand. The Portals were originally designed as cast-in-place concrete for supporting typical 30 m span elevated viaduct. Several types of portal frame with single and continuous beams, single columns and T- head columns are considered. In order to cover all the structural members, cross beams with typical 3x3 m segmental box section, piers and pier heads are elaborately designed. Stressing and lifting procedures were analyzed to simplify the erection process. A U-tendon system was adopted to connect the precast pier segments to the pile caps. In addition, structural safety of segmental cross beams was verified by full-scale loading test.</p>
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