Abstract
In this research, flexural performance was evaluated using macro-synthetic fiber-reinforced concrete (MFRC) in structural deck plates. Material tests were performed to evaluate the mechanical properties of the MFRC, and the flexural strength evaluation was conducted in two experiments, positive and negative moment tests. In the material test results, compressive strength and modulus of elasticity of the MFRC were increased compared with normal concrete. Flexural tensile tests showed that, after achieving maximum strength, the deck plates had sufficient residual strength until fracture. Structural tests showed that flexural strength and cracking load of all specimens increased according to macro synthetic fiber dosage. According to the experimental results, we proposed a flexural strength model of a steel deck plate containing macro synthetic fiber. The model showed greater accuracy than the current standard compared with the experimental results. In addition, since it was confirmed that the MFRC steel decks had greater flexural stiffness until yielding, it will be necessary to quantitatively evaluate the effect of MFRC on the effective flexural stiffness of steel decking in future studies.
Highlights
As more buildings are becoming high-rise, composite slab systems using deck plates are being applied to improve constructability, reduce construction time, and address economic feasibility
With the negative moment test specimens, we aimed to evaluate the flexural strength of the continuous end, with the variables of reinforcing macro-synthetic fiber dosage and amount of upper tensile reinforcement
As greater load was applied, a crack appeared, indicating shear-bond failure at the location of the deck rib height of 78 mm. This behavior was typical of partial-composite action, which occurs if the horizontal sheartransfer device is not effective enough for the steel deck and concrete to act as a unit without the occurrence of slip [25,29,30,31]
Summary
When a structural deck plate is permanent, it can resist tensile force without reinforcement. In slabs such as steel decking, the reinforcement ratio is low, and a larger area is exposed to air than in other structural members. This can cause wide cracks in a building. One method for preventing upper cracks in a slab and improving the flexural performance of the negative moment region of the deck plate is to apply fiber-reinforced concrete
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