Browsing by Author "Arisoy, B"

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    EXPERIMENTAL AND NUMERICAL ANALYSIS OF REINFORCED CONCRETE BEAM STRENGTHENED USING CARBON FIBER REINFORCED PLASTIC SHEETS AND BOLTED STEEL PLATE
    Ercan, E; Arisoy, B; Özyüksel Çiftçioglu, A
    This paper presents experimental and numerical study on reinforced concrete (RC) beams with flexural strengthening by carbon fiber reinforced polymer (CFRP) sheets and steel plates. In the study, effect of strengthening on flexural of RC beams is examined. Also, the differences between CFRP sheet and steel plate retrofitting regarding flexural strength of the RC beams are indicated. For experimental study, seven RC beams were produced. One of the beams is regarded as control sample, three of samples were strengthened using CFRP sheets and the other three samples strengthened using steel plates. Four points bending test was conducted, vertical displacements of the beams were measured. Tests results indicated that the beams were strengthened for flexure became vulnerable shear failure and CFRP application was better strength values in flexure than steel plates application. For numerical analysis, three-dimensional finite element modeling of strengthened and non-strengthened reinforced concrete beams is prepared. Reinforced concrete beam is modeled by using hexahedral, steel plate and CFRP sheets are modeled by using tetrahedral elements. Finite element analysis is performed by using ATENA non-linear analysis program. The results of experiments and finite element analysis are compared. Results indicated that the strengthened reinforced concrete beams have larger moment capacity, yet exhibit shear failure. Although, strengthened samples exhibit shear failure, failure is not brittle. Experimental results are also validated by finite element analysis.
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    Analysis of Strengthened Composite Beams Under Flexural Stress
    Ercan, E; Arisoy, B; Demir, A; Özdemir, A
    A steel-concrete composite beam is composed of a steel beam and concrete slap connected with shear connectors. Composite beams are highly efficient structural members in order to load carrying capacity because the tension component of the force pair originating from bending is carried by the steel profile and the compressive component is carried by the concrete slab in composite beams. In this study, numerical and experimental analysis of steel-concrete composite and strengthened steel-concrete composite beams is presented. In experimental study, one strengthened and one un-strengthened specimens are produced and tested in bending. Strengthening is produced applying carbon fiber reinforced polymers sheet to the lower flange of the steel beam and using steel fiber reinforced concrete in the concrete slab. Specimens are tested under four-point loading test. During the tests, load, deflection and strain values are collected by data acquisition system. In numerical study, the finite element models of the steel-concrete composite beams are generated and analyzed by Atena-GiD program. Comparison and evaluations are made in terms of strength, applicability, stiffness and energy consumption about the steel-concrete composite beams with carbon fiber reinforced polymers and steel fibered concrete for both numerical and experimental results.
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    The behavior of concrete-encased steel composite column-beam joints under cyclic loading
    Sermet, F; Ercan, E; Hökelekli, E; Demir, A; Arisoy, B
    This study outlines the cyclic loading response of a concrete-encased steel profile composite column-reinforced concrete beam connection. The experimental study performed for an interior joint. The column in joint was designed as a concrete-encased I-steel profile composite column according to Eurocode 4, and the beam was designed as a regular reinforced concrete beam according to local building codes. In order to emphasize the effect of the joint design, different steel core orientations were used. The numerical analysis was performed using ABAQUS to predict behavior of the joint. The performance of the samples compared the load-carrying capacity, ductility, and failure type. Comparisons were made using load-displacement relationships and failure mechanisms. The analysis results showed that the failure was determined by the behavior of the beam, and the joint capacity depended on the shear capacity of the beam.
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    Strengthening of brick masonry with PVA fiber reinforced cement stucco
    Arisoy, B; Ercan, E; Demir, A
    This paper presents the behavior of masonry walls externally strengthened by poly vinyl alcohol (PVA) fiber reinforced cement plaster. Tensile weakness of masonry wall is improved by simply applying fiber reinforced cement (FRC) plaster on masonry surface. Strengthening by ductile materials, in order to maintain ductile behavior of masonry to resist shear forces would provide reduction in the crack development and crack width providing delay in failure. FRC was applied to surfaces of the masonry wall as stucco to prevent crack growth under shear effect. An experimental program was performed to study the response of unreinforced and retrofitted masonry walls with externally applied fiber reinforced cement mixture, under shear and compressive loading. The experimental results indicate that retrofitting masonry walls with PVA fiber reinforced cement stucco increases the shear strength of the wall approximately half times in solid and high strength brick walls, 2.5 times in regular brick walls. (c) 2015 Elsevier Ltd. All rights reserved.