Abstract
The aim of this paper is to assess the structural behavior of hybrid thin-walled beams which were fabricated using laminated carbon fiber reinforced polymer (CFRP). Seven hybrid (CFRP) I-beams were fabricated, instrumented, then have been tested under monotonic four-point loading in order to evaluate their behavior up to failure. In constructing the I-beam specimens which were evaluated in this study, plywood core was implemented on both the web and flanges. Several important parameters were conducted in this study considering changing both of the ply orientations and stacking sequences of laminated fibers, also changing the shear span-to-depth ratio (a/d) of the specimens. The experimental results showed that stacking sequence is the most significant parameter that influences both flexural strength and stiffness of the hybrid beams. Also, the experimental results promoted the effectiveness of the core material for enhancing the flexure (bending) stiffness of beams. Then, these results were compared with a previous simulated study which used the finite element modeling to model the beams. Also, in order to evaluate the efficiency of the CRFP beams, the results were compared to similar steel beams having the same dimensions of the CFRP beams. As compared to steel beams, the load carrying capacity of the laminated beams is being high compared with steel beams when taking into consideration their specific strength ratio.
Highlights
In the last few years, there has been widespread use of FRPs in the construction field for different structural proposes, including the repair of existing damaged concrete members, as well as the erection of new structures entirely made of FRP
Different laminated thin-walled I-beams were fabricated, analyzed, and tested in 4-point bending to study its behavior. e experimental behavior of such beams was compared with the simulated study which was conducted by Yosri et al [10]. e parametric study was included changing the laminates stacking sequence and changing the laminates ply orientations and studied those effects on the behavior of HCFRP beams
We study the effectiveness of changing of shear span to depth ratio on the overall performances of HCFRP beams
Summary
In the last few years, there has been widespread use of FRPs in the construction field for different structural proposes, including the repair of existing damaged concrete members, as well as the erection of new structures entirely made of FRP. Hai et al [1] have performed bending tests on a group of hybrid carbon-glass FRP I-beams including variable carbon fiber contents in their flanges. E increase in the amount of carbon fiber (CF) had a direct effect for higher bending stiffness of the beams; the maximum load capacity was conducted for 33% content of CF. Nuno et al [2] have studied the performance of hybrid fiber-reinforced polymer five series I-beams under flexure. Several codes dealing with design methods and equations and safety factors for hybrid fiber-reinforced polymer composite elements have been developed. Seven different (CFRP) beams were studied experimentally and analytically and compared the results with a previous simulated study conducted by Yosri, A.M et al [10] which used the finite element modeling to model the beams. In order to evaluate the efficiency of the CRFP beams, the results were compared to similar steel beams having the same dimensions of the CFRP beams
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