Browsing by Author "Başaran, B."

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Citation - WoS: 33
Citation - Scopus: 41
Experimental Investigation and Analytical Prediction of Flexural Behaviour of Reinforced Concrete Beams With Steel Fibres Extracted From Waste Tyres
(Elsevier Ltd, 2023) Yıldızel, S.A.; Özkılıç, Y.O.; Bahrami, A.; Aksoylu, C.; Başaran, B.; Hakamy, A.; Arslan, M.H.
In recent years, studies on the use of car tyre wastes in concrete have gained momentum. Especially, the effect of recycled waste steel wires (RWSWs) from tyres to be mixed into concrete for using in newly designed reinforced concrete buildings on the performance of construction elements is a fairly new research area. In this study, the bending behaviour of 12 reinforced concrete beams was investigated having 1/3 geometric scale, 100 × 150 × 1000 mm in size, and produced with RWSWs additive in different volumetric ratios (1%, 2%, and 3%) under vertical loads. Another main parameter selected in the study was the amount of varying tension reinforcements (2ϕ12, 2ϕ10, and 2ϕ8). The load-carrying, stiffness, ductility, and energy dissipation capacities of the RWSW reinforced bending beams were compared with the primary aim of this study which was to examine and present the contribution of RWSWs on the improvement of the bending performance of the reinforced concrete beams. The results revealed that the mechanical properties of the hybrid beams with RWSWs vary depending on dosages but are comparable with those of the beams-only with the same fibre dosage. A positive effect was obtained for the hybrid beams containing 2–3% RWSWs. Besides, RWSWs were found to be highly well mobilised at larger crack widths, and the post-cracking strength of RWSW mixes was significantly higher. Considering both mechanical properties of the beams and fresh properties such as the workability, 2% of RWSWs is recommended to be utilised in the reinforced concrete beams. On the other hand, the results were compared with the predictions of the methods given in the literature and standards. Moreover, an equation was derived to better predict the capacity of the hybrid beams using RWSWs. © 2023 The Authors
Citation - WoS: 20
Citation - Scopus: 36
Mechanical Behavior in Terms of Shear and Bending Performance of Reinforced Concrete Beam Using Waste Fire Clay as Replacement of Aggregate
(Elsevier Ltd, 2023) Özkılıç, Y.O.; Başaran, B.; Aksoylu, C.; Karalar, M.; Martins, C.H.
In this experimental and analytical study, waste fire clay (WFC) was consumed by the use of replacing fine aggregate (FA) in confident amounts. It is targeted to remove the current sustainable complications by confirming the consumption of WFC in reinforced concrete beams (RCBs) as raw materials. For this purpose, FAs were partially replaced with WFC in proportions of 0 %, 10 %, 20 %, and 30 %. Based on this motivation, a series of experimental studies were performed on 12 + 12 small-scale bending and shear RCBs of 100×150×1000mm, considering altered WFC and stirrup spacing. While the percentage of WFC in the RCBs was selected as 0 %, 10 %, 20 %, and 30 % by weight, correspondingly, the longitudinal reinforcement was taken into account as ?12, ?10, ?8. Besides, while the longitudinal tension and compression reinforcements of constant 2?12 and 2?6, the stirrup spacing was chosen as 160 mm, 200 mm, and 270 mm. As a result of the study, increasing the tensile reinforcement ratio has made the WFC less effective. Similarly, as stirrup spacing decreases, stirrup dominates the behavior, and as stirrup spacing increases, WFC determines the behavior. Finally, while the WFC content for bending RCBs increases the ability at the maximum level for the range of 20 %-30 %, it can be said that the optimum WFC content for shear RCBs is 20 %. The experimental results were obtained with the prediction of ACI-318 and the reason for the difference between the expected and actual values can be explained in detail. © 2023
Citation - WoS: 4
Citation - Scopus: 4
Strengthening Shear Deficiency in Undamaged Reinforced Concrete Beams Using Innovative 45° Mechanical Steel Stitches
(Elsevier Ltd, 2023) Aksoylu, C.; Uysal, Y.; Özkılıç, Y.O.; Başaran, B.; Arslan, M.H.
In this study, beams with insufficient shear capacity were reinforced with U-shaped Mechanical Steel Stitches (MSS), which is an innovative approach. MSSs were applied at an angle of 45 degrees along the shear span on both faces of the beam body. A total of eight shear beam specimens, one of which is a reference and the other seven with different MSS spacing, were examined under vertical loads. The diameter, anchorage depth and mechanical properties of the MSSs and the geometry, longitudinal and transverse reinforcements of the reinforced concrete beam were kept constant. By changing the MSS intervals (from d/5 to d), the change was investigated in terms of strength, ductility, stiffness and energy consumption capacities. As a result of the study, 54% increase in shear capacity was observed in the beam with the most tightened MSS spacing (d/5). However, the nominal yield and total energy consumption capacity increased by 144% and 366%, respectively, compared to the reference beam. While splitting damage was most frequently observed in the MSS application with d/5, the damage turned into diagonal tension collapse, which is more abrupt and brittle as the spacing increases to d/2 range. As the MSS interval in beams increased from d/5 to d/2, the nominal yield stiffness of the beams showed a decreasing trend between 2.1% and 21.2% compared to the reference beam. Based on the experimental results, the developed novel strengthening methods can applicable to beams if the interval of MSS spacing is tightened enough. © 2023 Institution of Structural Engineers