Yazar "Buyukkaragoz, Alper" seçeneğine göre listele

Listeleniyor 1 - 6 / 6
  • Küçük Resim
    Öğe
    Finite element analysis of the beam strengthened with prefabricated reinforced concrete plate
    (Academic Journals, 2010) Buyukkaragoz, Alper
    Various strengthening methods were frequently carried out in the world to strengthen weaker cross section beams. In this study, one beam strengthened by bonding with a prefabricated plate which has 80 mm thickness underneath and one control beam were produced. The specimens were tested in the laboratory and a single load was applied on the middle of the beam. The results of the experiments were compared with the results obtained from the beam modelled with ANSYS finite element program. When the results of the experiments were compared with the modelled computer program, it was shown that the results of computer model gave similar results to the real behaviour.
  • [ X ]
    Öğe
    Influence of Web Distortions on Inelastic Lateral Buckling Length
    (Gazi Univ, 2021) Ertenli, M. Fethi; Kalkan, Ilker; Buyukkaragoz, Alper
    A critical failure mode is encountered in double symmetric steel I-beams, which is known as lateral distortional buckling (LDB), when the web slenderness ratio of the section is relatively high. LDB is a buckling mode arising through the interaction of the wellknown lateral torsion buckling (LTB) and web buckling, i.e. local buckling (LB), modes. Web slenderness and flange compactness have significant effects on LDB. This study focused on the inelastic LDB behavior of doubly-symmetric steel I-beams. The inelastic behavior increases and web distortions take place with the initiation of yielding in the web (between neutral axis and compression flange) with decreasing beam length. Generally, web distortions are encountered more commonly in the inelastic range of buckling. In this study, analytical limiting unbraced length (Lr) values of the beams with different web slenderness values from the inelastic LTB (Lr) formula of the Turkish Steel Structures Design Code (TSSDC 2016) were compared to the respective finite element results. Lr values were observed to increase due to web distortions. Yielding was determined to be the most influential parameter on web distortions. As a result of LDB, numerical Lr values were higher than the respective analytical estimates from code formulations. However, as the web slenderness of the section increases, the numerical-to-analytical Lr ratio was shown to increase. The study underscored the need to include LDB formulas into the current steel structure design specifications.
  • [ X ]
    Öğe
    Lateral torsional buckling of doubly-symmetric steel cellular I-Beams
    (Techno-Press, 2023) Ertenli, Mehmet Fethi; Erdal, Erdal; Buyukkaragoz, Alper; Kalkan, Ilker; Aksoylu, Ceyhun; Ozkilic, Yasin Onuralp
    The absence of an important portion of the web plate in steel beams with multiple circular perforations, cellular beams, causes the web plate to undergo distortions prior to and during lateral torsional buckling (LTB). The conventional LTB equations in the codes and literature underestimate the buckling moments of cellular beams due to web distortions. The present study is an attempt to develop analytical methods for estimating the elastic buckling moments of cellular beams. The proposed methods rely on the reductions in the torsional and warping rigidities of the beams due to web distortions and the reductions in the weak-axis bending and torsional rigidities due to the presence of web openings. To test the accuracy of the analytical estimates from proposed solutions, a total of 114 finite element analyses were conducted for six different standard IPEO sections and varying unbraced lengths within the elastic limits. These analyses clearly indicated that the LTB solutions in the AISC 360-16 and AS4100:2020 codes overestimate the buckling loads of cellular beams within elastic limits, particularly at shorter span lengths. The LDB solutions in the literature and the Eurocode 3 LTB solution, on the other hand, provided conservative buckling moment estimates along the entire range of elastic buckling.
  • Küçük Resim
    Öğe
    A numerical and analytical study on distortional buckling of doubly-symmetric steel I-beams
    (Elsevier Sci Ltd, 2012) Kalkan, Ilker; Buyukkaragoz, Alper
    This study investigates the effect of web distortions in a lateral distortional buckling mode on the buckling moments of doubly-symmetric steel I-beams. Analytical buckling moment expressions applicable to both elastic and inelastic lateral distortional buckling were developed. These expressions account for the reductions in the torsional and warping rigidities of I-beams due to web distortions. Numerical results obtained from the finite element analysis showed that the buckling moments of steel I-beams with stocky flanges and slender webs are overestimated by the lateral torsional buckling solutions while the proposed distortional buckling solutions provide estimates in closer agreement with the numerical results. Finally, the lateral torsional buckling solutions in the structural steel standards were found to generally provide conservative buckling moment estimates for doubly-symmetric steel I-beams prone to web distortions. (C) 2011 Elsevier Ltd. All rights reserved.
  • [ X ]
    Öğe
    STRESS ANALYSIS OF DOUBLE SKIN COMPOSITE BEAMS BY FINITE ELEMENT ANALYSIS
    (Pamukkale Univ, 2007) Dogan, Orhan; Buyukkaragoz, Alper
    Double skin composite (DSC) construction consists of a layer of a plain concrete, sandwiched between two layers of relatively thin steel plate, connected to the concrete by welded stud shear connectors. This results in a strong and efficient structure with certain potential advantages over conventional forms of construction. The main aim of the present study is to provide additional numerical solution to compare with previous researches and to develop appropriate functions of optimum design depending on double skin composite beams. Ansys 5.4 program has been used for finite element analysis.
  • [ X ]
    Öğe
    The Effects of Reinforcement Ratio on Flexural Behavior in Hybrid (GFRP-Steel) Reinforced Concrete Beams
    (Gazi Univ, 2021) Kaya, Nalan; Avanoglu Sicacik, Eda; Bakirci Er, Sule; Kopraman, Yagmur; Buyukkaragoz, Alper
    In this study, flexural behavior of hybrid reinforced concrete beams were investigated theoretically and by the finite element method. Within the scope of the study, beams with identical geometry and concrete compressive strength; designed as having different reinforcement ratios. The results obtained from the theoretical work and finite element method were commentated by using load-displacement curves, load carrying capacities and strain indices. The effects of the fibrous polymer / steel ratio (Af / As) on the stiffness, strength and midpoint displacement of the beams were investigated. In addition, the effects of reinforcement ratio on load carrying capacity and deformability indexes were investigated.