Flexural Strength of Composite Deck Slab with Macro Synthetic Fiber Reinforced Concrete

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.

Deflection Estimation Based on the Thermal Characteristics of Composite Deck Slabs Containing Macro-Synthetic Fibers

“…The deck plate used in the tests was SGC 365Y steel grade, as suggested in KS D 3506 [28]. The yield strength was 365 MPa and the modulus of elasticity was 210,000 MPa [2]. V f : macro fiber dosage, f r : flexural tensile stress, f R,1,2,3 : residual flexural tensile strength corresponding to CMOD = 0.5 mm, 1.5 mm, and 2.5 mm.…”

“…Therefore, it is possible to shorten the construction period, increase constructability, and reduce costs [ 1 ]. Because the deck plate acts as a tension member, a separate reinforcing bar placement is not required [ 2 , 3 ]. However, the deck slab is vulnerable to high temperatures because the deck plate is exposed to the external environment.…”

“…To overcome this, fire protection coverings are applied to the exposed surface to form a fire-resistant structure. Modern structural deck plates have a modified shape to increase the composite effect of deck plates and concrete, with the addition of a rib on the bottom steel plate and a Y-shape flange at the end of the rib [ 2 , 3 ]. Because this composite slab increases the composite effect of the deck plate and concrete, fire resistance and structural performance can be ensured without a fire-protective covering on the deck plate [ 1 ].…”

“…Fiber-reinforced concrete (FRC) does not require upper temperature shrink reinforcement, so the constructability is expected to increase while the construction process decreases. Macro-synthetic fiber is easy to construct, is more effective at crack control than microfiber, and has high tensile strength [ 2 , 3 ]. Moreover, macro-synthetic fiber is an economical material because it can replace shrinkage and temperature reinforcement and can reduce the reinforcing bar work.…”

Design Study of Steel Fibre Reinforced Concrete Shaft Lining for Swelling Ground in Toronto, Canada

“…Recently, many types of fibre reinforced concrete (FRC), including steel and synthetic materials, have been investigated to serve as a material that can partially or fully substitute for RC in structures [17][18][19][20][21][22]. In particular, steel fibre reinforced concrete (SFRC) is becoming increasingly used in structures because it has advantages over RC in terms of increasing cracking resistance and residual strength of cracked concrete due to the fibres bridging effect [23][24][25][26][27][28][29].…”