Browsing by Author "Basaran, B."

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Influence of Overhang Length on Ltb Behavior of Compact Doubly-Symmetric Steel I-Beams
(Taylor and Francis Ltd., 2025) Basaran, B.; Aksoylu, C.; Kalkan, I.
The present study pertains to elaborating on the effects of overhang lengths beyond end supports on elastic and inelastic Lateral Torsional Buckling behaviour of doubly-symmetric steel I-beams. Finite element analyses were performed on compact sections to avoid the local (plate) buckling and beam distortions to interfere with the overall beam behaviour. Accuracy of the numerical analyses was verified with the help of existing experimental results. Subsequent to this verification, 120 beams with five different compact I-sections, four different overhang lengths, two different unbraced span lengths and three different sweep values were analysed. The numerical buckling moments of the beams with considerable overhangs were established to remain well below the respective estimates from AISC 360-16 formulation. The difference between the numerical and analytical values stems from the inability of the formula to reflect the lateral deflections of overhangs, i.e. predicating on full lateral restraint beyond unbraced spans. The study also indicated that flexural rigidities and moment capacities of beams increase with increasing overhang lengths. The increase in the buckling moment resistance in elastic and inelastic LTB were established to reach 11 and 16%, as the overhang-to-total length ratio increases from 0 to 0.30 for various sweep values. © 2025 Informa UK Limited, trading as Taylor & Francis Group.
Shear Behavior of Reinforced Concrete Beams Strengthened With a 45° Inclined MSS Technique: Parametric Study of Shear Span-To Ratio and Beam Height
(Taylor and Francis Ltd., 2025) Aksoylu, C.; Fadimana, Bas; Uysal, Y.; Basaran, B.; Arslan, M.H.; Özkılıç, Y.O.
Current methods for strengthening reinforced concrete beams with insufficient shear capacity have structural and practical limitations. This study experimentally investigated the performance of a 45° inclined Mechanical Steel Stitches (MSS) technique under four-point loading. 17 beams (3 reference, 14 strengthened) with shear span-to-depth ratios (av/d = 2.5, 3.3, 4.9) and section heights (250, 360 mm) were tested, while a group with av/d = 3.3 and 250 mm height was adopted from the literature for comparison. Beams were evaluated in terms of maximum load, displacement, energy dissipation, stiffness, ductility, and failure modes. Results showed that MSS was highly effective, particularly at low av/d ratios. The maximum capacity increase reached 86.2% for av/d = 2.5, decreasing to 50.6% at av/d = 3.3 and 14.9% at av/d = 4.9, where diagonal cracks intersecting MSS anchor holes limited the contribution. The optimum MSS spacings were determined as d/2.5 for av/d = 2.5 and d/5 for av/d = 3.3 and 4.9. Increasing beam height from 250 to 360 mm reduced MSS effectiveness by 5.4–27.5%. All reference beams failed in brittle diagonal tension, while strengthened beams exhibited splitting (43%) or combined diagonal tension–splitting (29%). Decreasing MSS spacing shifted failure from diagonal tension to splitting. Overall, the inclined MSS technique proved effective and practical for strengthening shear-deficient beams, offering guidance for design and application. © 2025 Taylor & Francis Group, LLC.