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    Experimental and analytical research on geopolymer concrete beams reinforced with GFRP bars
    (Techno-Press, 2024) Adakli, Suleyman Anil; Tokgoz, Serkan; Karaahmetli, Sedat; Dundar, Cengiz
    This paper presents the behavior of geopolymer concrete beams reinforced with glass fiber reinforced polymer (GFRP) bars. In the study, ordinary Portland cement concrete and geopolymer concrete beams having GFRP bars were prepared and tested under four- point loading. The load- deflection diagrams and load capacities of the tested beams were obtained. It was observed that the tested beams exhibited good ductility and significant deflection capacity. The results showed that increasing the tension GFRP reinforcement ratio caused enhancement in the strength capacity of geopolymer concrete beams. In addition, the tested beams were analyzed to obtain the load capacity and the load- deflection responses. The theoretical load-deflection curves and load bearing capacities have been predicted well with the test results. Parametric study has been performed to determine the influences of concrete strength, shear span to depth ratio (a/d) and reinforcement ratio on the behavior of geopolymer concrete beams longitudinally reinforced with GFRP bars. It was concluded that increasing concrete strength led to an increase in load capacity. Besides, the ultimate load increased as the reinforcement ratio increased. On the other hand, increasing a/d ratio reduced the ultimate load value of GFRP reinforced geopolymer concrete beams.
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    Investigation of Seismic Behaviour of a Construction of a Conveyor Line in a Coal Power Plant
    (2023) Uludamar, Erinç; Egüz, Sinan; Çelebi, Kerimcan; Karaahmetli, Sedat
    The conveyor line that carries raw materials from storage area to inside of a facility is the main vessel of a coal power plant. Therefore, this critical line should be designed by considering the many loads likely to be exposed in the field in order for the plant to operate uninterruptedly. In this study, seismic behaviour of a construction of a conveyor line was investigated by using Finite Element Analysis. The structure of coal carrier conveyor line of a coal power plant, operating in Adana, Türkiye was considered as a case study. In the study, the parts of the conveyor line were modelled as 1-D. The modified acceleration history of Golcuk-1999 earthquake was applied on the structure on lateral direction. The results showed that the maximum stress is slightly higher than the elastic limit of the steel and less than the ultimate strength. Although the construction of the conveyor line withstands the applied loads, modification should be carried out to prevent the damage on the construction.
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    Research on concrete-filled stainless steel tubular composite columns
    (Elsevier Science Inc, 2021) Tokgoz, Serkan; Dundar, Cengiz; Karaahmetli, Sedat; Ozel, Ruken
    Concrete-filled stainless steel tubular composite columns are used in the structures. It is important to define the structural behaviour of this type of columns. This paper presents experimental and theoretical studies of eccentrically loaded concrete-filled stainless steel tubular composite columns. The column specimens were manufactured with high strength outer stainless steel tube, in-filled concrete and inner carbon structural steel. The tubular composite column specimens were designed with plain concrete and steel fiber reinforced concrete. The column specimens were tested and the experimental load-deflection curves of columns were presented in the study. In addition, the tested plain and steel fiber concrete-filled stainless steel tube composite columns were analysed based on a theoretical method for the prediction of strength and load-deflection behaviour. It was observed that the tested tubular column specimens behaved in a ductile manner. A good degree of agreement was obtained between the experimental and theoretical load-deflection curves of concrete-filled stainless steel tubular composite columns. In addition, a parametric study was carried out to examine the influences of loading eccentricity, slenderness, plate slenderness and the concrete compressive strength on concrete-filled stainless steel tubular composite column behaviour. It was concluded from the parametric study that the strength of columns increased by increasing stainless steel wall thickness and concrete compressive strength. However, column strength decreased when the eccentricity and column length were increased.
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    Test and analysis of concrete-filled double steel and double skin tubular columns having outer stainless steel tube
    (Techno-Press, 2022) Tokgoz, Serkan; Karaahmetli, Sedat; Dundar, Cengiz
    This paper presents experimental and analytical studies of eccentrically loaded concrete-filled double steel (CFDST) and concrete-filled double skin tube (DCFST) columns having outer stainless steel tube. Eighteen CFDST and DCFST column specimens were manufactured and tested to examine the strength and load-deflection responses. In the study, the main parameters were concrete strength, load eccentricity, cross section and slenderness. The strengths, load-deflection diagrams and failure patterns of the columns were observed. In addition, the tested CFDST and DCFST columns were analyzed to attain the capacity and load versus lateral deflection responses. The obtained theoretical results were compared with the test results. A parametric study was also performed to research the effects of the ratio of eccentricity (e/Ho) slenderness ratio (L/r), Ho/to ratio, Hi/ti ratio and the concrete compressive strength on the behavior of columns. In this work, the obtained results indicated that the ductility and capacity of columns were affected by cross section, concrete strength, steel strength, loading eccentricity and slenderness.