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  • Küçük Resim
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    A 3D nonlinear numerical analysis of buried steel pipes at strike-slip fault crossings
    (Croatian Soc Civil Engineers-Hsgi, 2016) Kaya, Ercan Şerif; Uçkan, Eren; Çakır, Ferit; Akbaş, Bülent
    A 3D nonlinear soil-pipe interaction model is presented in this study to calculate the response of steel pipes subjected to strike-slip fault displacements. The general-purpose finite element analysis program ABAQUS is used to determine the seismic response of high strength steel pipes, as well as for various surrounding soil conditions and diameter to thickness, D/t, ratios. Relatively low strength pipes X65, and high strength pipes X70 and X80, which correspond to European pipes L450, L485 and L555, respectively, have been studied for various pipe diameters and thicknesses.
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    Failure analysis of a welded steel pipe at Kullar fault crossing
    (Pergamon-Elsevier Science Ltd, 2017) Kaya, Ercan Şerif; Uçkan, Eren; O'Rourke, Michael J.; Karamanos, Spyros A.; Akbaş, Bülent; Çakır, Ferit; Cheng, Yin
    The seismic response of a 2200-mm-diameter welded steel pipe at strike slip Kullar fault crossing in Izmit, Kocaeli during 1999 Kocaeli earthquake is investigated. The pipe was crossing the fault-line with an angle of 55 degrees and suffered leaks due to 3.0 m of right lateral movement of fault, which imposed compressive axial strain in the pipe. The backfill material of the trench was native soil which was non-homogenous (soft and stiff clay) with respect to fault line-soft material on the North side, stiff material on the South side. Field observations revealed two major wrinkles with finger width cracks and a minor wrinkle on the soft soil side of the fault. Large plastic strains and local folding were observed at wrinkles due to compressive strains. The case is known as one of the best documented fault crossing examples. The failure behavior of the Thames water pipe during 1999 Kocaeli earthquake is simulated by utilizing a 3D nonlinear continuum FE model. The numerical model considers contact surface at soil pipe interface and performs large deformation analyses of the pipe. The locations of wrinkles as well as axial displacements/rotations demands due to fault rupture are predicted. It is observed that once wrinkle initiates, strain in the pipe away from the wrinkle reduces after initial local buckling and additional shortening of the pipeline tends to accumulate at the wrinkle causing large plastic strains and rotation demands associated with fault rupture, an observation consistent with field observations and 2005 ALA guidelines. (C) 2016 Elsevier Ltd. All rights reserved.
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    Merkezi çaprazlı çerçevelerde dayanım farklılığı sonucu oluşan burulma etkileri
    (2018) Akşar, Bora; Akbaş, Bülent; Kaya, Ercan Şerif; Çakır, Ferit
    Bu çalışma, çapraz elemanların dayanımındaki rastlantısal farklardan dolayı merkezi çaprazlı çerçeveler(MÇÇ) kullanılarak tasarlanmış yapıların kuvvetli deprem yer hareketleri altında sergilediği burulmadavranışını incelemeyi amaçlamıştır. Bu çalışmada, çaprazlardaki dayanım farklılığının, çaprazın gerçekdayanımının minimum akma gerilmesinden (Fy) değil, arttırılmış (beklenen) akma gerilmesinden (RyFy) kaynaklandığı kabulü yapılmıştır. Bu amaçla alçak ve orta katlı yapıları temsilen, üç ve dokuz katlı dışçerçeveleri MÇÇ olarak tasarlanmış farklı çapraz dayanım konfigürasyonlarına sahip iki yapıdaki burulmanedeniyle oluşabilecek doğrusal olmayan davranış kuvvetli deprem yer hareketleri altında incelenmiştir.Yapının kapasite eğrisi farklı durumlar için elde edilmiştir ve zaman tamın alanında doğrusal olmayan analizyöntemi ile belirlenen göreli kat ötelemesi oranları sunulmuştur
  • Küçük Resim
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    Numerical Heat Flux Analysis of a Trombe Wall System in Turkey
    (2022) Kaya, Ercan Şerif
    Trombe wall is an inexpensive passive heating design method used for storing and utilizing solar energy to increase indoor temperature without relying on any mechanical system that requires additional energy. Most recent studies concerning solar wall configuration and energy efficiency have been conducted by using computational fluid dynamics. One reason for this is because semi-transparent and opaque boundaries are provided in simulating wall and glazing surfaces around the fluid domain and solar heat flux energy are allowed in through semi-transparent boundaries. However, finite element method programs employ solid and shell elements as opaque walls that transmit the energy into the domain. In this study, numerical heat flux analysis of a Trombe wall system, which was built for a previous experimental study, has been performed and numerical and experimental analysis results have been verified. According to the simulation studies, heat transfer analysis results are obtained in a good agreement with real time measurements when additional solar load calculated due to transmissivity are defined at the surfaces which are expected to be sun exposed. Besides, numerically verified model of the Trombe wall system was used in evaluating energy saving potential of residential buildings for three cities with different climate regions in Turkey.
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    Relative story displacements and torsional effects caused by strength variations in concentrically braced frames
    (Gazi Univ, Fac Engineering Architecture, 2018) Aksar, Bora; Akbaş, Bülent; Kaya, Ercan Şerif; Çakır, Ferit
    This study will investigate the accidental torsional response in steel structures designed by CBFs due to the variation in strength of braces under strong earthquake ground motions. For this study, it is assumed that the variation in strength of braces would come from the expected yield stress (RyFy) rather than minimum specified yield stress (Fy) of brace member. For this purpose, inelastic torsional response of a three and nine-story building having perimeter CBFs having various brace strength configurations subjected to strong earthquake ground motions is investigated in detail. The results are presented in the form of base shear vs. roof displacement (pushover curve, capacity curve) and drift ratio through nonlinear dynamic response analyses.
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    Seismic vulnerability of masonry Jack arch slabs
    (Pergamon-Elsevier Science Ltd, 2017) Özdemir, Muhammed Alperen; Kaya, Ercan Şerif; Aksar, Bora; Şeker, Burçin Şenol; Çakır, Ferit; Uçkan, Eren; Akbaş, Bülent
    After the industrial revolution, the use of jack arch slabs (JAS) was quite common in many historical structures with the availability of iron and steel in structural engineering field. JAS is a composite system of steel I-beams and masonry bricks, which are placed between steel I beams. This study focuses on the structural failures and weaknesses of masonry structures with JAS. The aims of this paper are to deeply illustrate the structural vulnerability of masonry JAS and to summarize the positive and negative effects of JAS on structural behavior. Within the scope of this study, this study focuses on historical American Boarding School for Girls in Merzifon, Turkey, which has one-way masonry JAS. It essentially assesses the structural behavior of the school and investigates the seismic vulnerability of JASs. For this purpose, the mechanical properties of the structural materials have been primarily evaluated with experimental tests. Then the finite element analyses have been carried out with the use of three dimension numerical model in order to investigate the structural behavior of the structure. (C) 2017 Elsevier Ltd. All rights reserved.
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    The performance of thames water pipeline at the kullar fault crossing
    (American Society of Civil Engineers (ASCE), 2016) Uçkan, Eren; Kaya, Ercan Şerif; O'Rourke, Michael; Çakır, Ferit; Akbas, B.
    This paper summarizes the earthquake performance of the welded steel Thames water transmission pipeline which was crossing the Kullar fault in the 1999 Kocaeli earthquake. The pipe suffered wrinkling damage at three locations (two major and one minor) due to net compression which was caused by the right lateral movement of the fault. However, it still managed to stay in service in the aftermath of the earthquake. It is known to be one of the best documented pipe failure cases due to fault displacement hazard. A 3D nonlinear analysis of the pipe-soil interaction system is utilized to investigate the effects of both native and artificial backfill soils. The failure mode and limit state of pipe for compressive and tensile strains are mentioned. The rotation and displacement demands at the wrinkles due to incrementally applied fault displacements are calculated. Results are compared with the field observations. Recommendations are provided to mitigate earthquake risk and for safe operation of similar critical infrastructures against fault displacement hazards. © 2017 American Society of Civil Engineers.