Akademik Veri Yönetim Sistemi
STRUCTURAL CONCRETE, cilt.25, sa.3, ss.1-15, 2024 (SCI-Expanded)
In this article, the effect of hooked-end fibers with different lengths on the struc-tural performance of RC-FPs fabricated from hybrid fiber-reinforced self-compacting concrete (HFR-SCC) was investigated. For this purpose, a total of15 full-scale test samples having different plate thicknesses (60, 70, and 80 mm)were produced and tested under bending after a 90-day curing period. Subse-quently, load-carrying capacity (Pp), flexural toughness (Fth), and deflection duc-tility index (μu) of all RC-FPs were found using load-deflection curves obtainedfrom bending tests, while crack patterns were drawn from the samples tested.Besides, high-precision contour plots are proposed to estimate the structural per-formance values of RC-FPs depending on plate thickness and fiber reinforcingindex. As a result, the best structural performance in RC-FPs was obtained fromthe use of a longer hooked-end steel fiber together with micro steel fiber as ahybrid, followed by the lower length hooked-end steel fibers as singles. Specifi-cally, irrespective of the plate thickness, the hybrid use of longer hooked steelfibers in combination with micro fibers increased thePp,Fth,andμuvalues ofRC-FPs on average 1.67, 1.76, and 1.57 times, respectively, compared to the con-trol specimens. As for when using the lower length hooked-end fiber as single,the values ofPp,Fth,andμuincreased on average 1.57, 1.69, and 1.30 times.Lastly, whereas plate thickness has little effect on improving the structural perfor-mance of thin-walled carrier elements such as RC-FPs, adding fibers in differentlengths, aspect ratios, and combinations is much more effective. The collectivetest results demonstrate that using RC-FPs made of HFR-SCC in the roof carriersystem of large span structures could improve structural performance, aesthetics,erection time, and earthquake behavior thanks to reduced dead load.