Flexural Behaviour of Bridge Deck Slabs Reinforced With FRP Composite Bars

Abstract

The serviceability concerns, specially cracking and deflections usually govern the design of reinforced concrete deck slabs. This research program is designed to investigate the flexural behaviour of concrete one-way (deck) slabs reinforced with different types of FRP composite bars. A total of 7 full size slabs were constructed and tested. The slabs were 3100-mm long xlOOOmm wide x 200-mm deep. The test parameters are the type of FRP reinforcing bars as well as the reinforcement ratio. Three slabs were reinforced with glass FRP, three were reinforced with carbon FRP bars, and one control slab was reinforced with conventional steel. The slabs were tested under four-point bending over a simply supported clear span of 2500 mm and a shear span of 1000 mm. The test results are presented in terms of deflection, crack width, strains in concrete and reinforcement, ultimate capacity, and mode of failure. Comparison with the predictions of CAN/CSA-S806-02 Code and ACI 440.1R-01 design guidelines were also made.

Static behavior of RC deck slabs partially prestressed with hybrid fiber reinforced polymer tendons

“…The deflections at the service load level ( P ser = 110.25 kN) for the tested deck slabs ranged from 1.20 to 2.28 mm, which were below the allowable limits (1/400 of the span) . The control slab (SF) exhibited the largest deflection at the service load level, but it should be noted that due to continuity of the slab over the girders in the actual bridge deck, the deflections at the same load level are expected to be less than what was measured in the laboratory . The FRP‐reduction factor and the partial prestressing index have no effect on the deflection at the service load level.…”

“…13 The control slab (SF) exhibited the largest deflection at the service load level, but it should be noted that due to continuity of the slab over the girders in the actual bridge deck, the deflections at the same load level are expected to be less than what was measured in the laboratory. 2 The FRP-reduction factor and the partial prestressing index have no effect on the deflection at the service load level. In fact, these slabs exhibited cracking loads higher than the service load level; therefore, the deflections of these slabs were controlled by the gross inertia of the concrete cross section.…”

“…Bridge decks reinforced with fiber reinforced polymer (FRP) tendons have been widely investigated and applied over the past 20 years . Moreover, the design and construction methods of FRP‐RC bridge deck slabs are proposed in the existing literature .…”

“…Bridge decks reinforced with fiber reinforced polymer (FRP) tendons have been widely investigated and applied over the past 20 years. [1][2][3][4][5][6][7][8][9] Moreover, the design and construction methods of FRP-RC bridge deck slabs are proposed in the existing literature. 10,11 Because of the relatively low stiffness of FRP composites, especially GFRP, RC members reinforced with FRP based on the equivalent strength principle exhibit larger deflections and crack widths than the conventional steel-reinforced members.…”

Nonlinear finite element analyses of FRP-reinforced concrete slabs using a new layered composite plate element

“…However, due to the relatively low modulus of FRPs, FRP-reinforced concrete structures would exhibit greater deflections than their steel-reinforced counterparts, and this reduces the serviceability of the flexural members. Accordingly serviceability requirements govern the design for FRPreinforced concrete members in most cases [3][4][5], especially for intermediate and long spanning sections reinforced with FRP bars. In addition, the linear stress-strain relationship of FRPs up to rupture without a discernible yield point leads to a non-plastic ultimate state for concrete members reinforced with FRPs.…”