Abstract
This paper presents the shear capacities of concrete beams reinforced with glass fiber reinforced polymer (GFRP) plates as shear reinforcement. To examine the shear performance, we manufactured and tested a total of eight specimens. Test variables included the GFRP strip-width-to-spacing ratio and type of opening array. The specimen with a GFRP plate with a3×2opening array showed the highest shear strength. From the test results, the shear strength increased as the strip-width-to-strip-spacing ratio increased. Also, we used the experimental results to evaluate whether the shear strength equations of ACI 318-14 and ACI 440.1R can be applied to the design of GFRP shear reinforcement. In the results, the ACI 440 equation underestimated the experimental results more than that of ACI 318.
Highlights
Several studies have been carried out on the flexural behavior of concrete beams with fiber reinforced polymer (FRP) tensile reinforcement because FRP materials have advantages such as corrosion resistance, light weight, machinability, workability, and high strength [1,2,3,4,5]
The strength of the bent portion is significantly less than that of the straight part of FRP rods; several codes and design guidelines have specified the reduced capacity of FRP stirrups caused by bending the bars [9,10,11,12]
We considered the array of openings, glass fiber reinforced polymer (GFRP) strip-width-to-spacing ratio, and the amount of reinforcement as variables
Summary
Several studies have been carried out on the flexural behavior of concrete beams with fiber reinforced polymer (FRP) tensile reinforcement because FRP materials have advantages such as corrosion resistance, light weight, machinability, workability, and high strength [1,2,3,4,5]. Most FRP shear reinforcement for concrete members has been studied as a means of retrofitting. Typical shear reinforcement (stirrup) for concrete members is difficult to fabricate with FRP materials because of their brittle nature and unidirectional characteristics. Recent studies investigated the shear capacities of FRP stirrups and proposed an equation of shear strength [12,13,14,15]. Kim et al proposed a new type of FRP shear reinforcement as a substitute for steel stirrups [16]. Plate-type FRP shear reinforcement has better constructability and easier fabrication than FRP stirrups. The types of FRP and shape of reinforcement did not significantly affect the shear strength. In this paper, considering economics and ease of fabrication, we use a lattice shaped GFRP material for shear reinforcement.
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