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İnşaat Mühendisliği Bölümü

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Citation Count: Çelik, Gence Genç; Çelik, O. (2019). "A Case Study of Structural Failure of Mounting Systems for Solar Panels from South-Eastern Turkey: An Investigation of Design Parameters under Extreme Weather Events", International Journal of Engineering Science Invention (IJESI), Vol. 8, No. 1, pp. 16-23.
A Case Study of Structural Failure of Mounting Systems for Solar Panels from South-Eastern Turkey: An Investigation of Design Parameters under Extreme Weather Events
(2019) Çelik, Gence Genç; Çelik, O.; 101566
One of the biggest demand of growing population, and cornerstone of the socio-economical growth of Nations, Energy is expected today to be Sustainable, Easy to Reach, Economical, and Continuous. As one of the most common and imperative contributors of this Clean Energy Future, Solar Energy in various forms takes a significant role whole around the World. And It shows a great potential particularly for Turkey which imports the majority of its Energy Resources - including Conventional Ones - from Out Sources, to decrease Energy Dependency on Out-of-country Bases and increase awareness to develop competition in New Technology and Production Fields. Based on a Structural Failure Case of Supporting Frames designed for Solar Photovoltaics (PV) in a Solar Power Plant from Turkey, this paper addresses the significance of Local and Site-Specific Investigation of Climate Data to properly decide on Structural Design Parameters -particularly Loads of Snow and Wind- by staying still comformable with National Codes and Standards.
Citation Count: S., Selçuk; P., Tang (2023). "A metaheuristic-guided machine learning approach for concrete strength prediction with high mix design variability using ultrasonic pulse velocity data", Developments in the Built Environment, Vol. 15.
A metaheuristic-guided machine learning approach for concrete strength prediction with high mix design variability using ultrasonic pulse velocity data
(2023) S., Selçuk; P., Tang
Assessment of concrete strength in existing structures is a common engineering problem. Several attempts in the literature showed the potential of ML methods for predicting concrete strength using concrete properties and NDT values as inputs. However, almost all such ML efforts based on NDT data trained models to predict concrete strength for a specific concrete mix design. We trained a global ML-based model that can predict concrete strength for a wide range of concrete types. This study uses data with high variability for training a metaheuristic-guided ANN model that can cover most concrete mixes used in practice. We put together a dataset that has large variations of mix design components. Training an ANN model using this dataset introduced significant test errors as expected. We optimized hyperparameters, architecture of the ANN model and performed feature selection using genetic algorithm. The proposed model reduces test errors from 9.3 MPa to 4.8 MPa. © 2023 The Authors
Citation Count: Ghoroubi, Rahim; Mercimek, Ömer; A.C., Anıl Özgür (2020). "Açılı CFRP Ankrajlı Şeritler ile Beton Yüzey Arasındaki Gerilme Deformasyon Davranışı için Yeni Bir Model Önerisi", Uluslararası Mühendislik Araştırma ve Geliştirme Dergisi, Vol.12, No.2, pp.380-387.
Açılı CFRP Ankrajlı Şeritler ile Beton Yüzey Arasındaki Gerilme Deformasyon Davranışı için Yeni Bir Model Önerisi
(2020) Ghoroubi, Rahim; Mercimek, Ömer; A.C., Anıl Özgür
Betonarme, çelik veya yığma yapılar birçok farklı nedenden dolayı güçlendirilmeleri veya onarılmaları gerekmektedir. Karbon takviyeli elyaf kumaşlar (CFRP) deprem performansı yetersiz yapıların onarım ve güçlendirme çalışmalarında son 20 yıldır yaygın olarak kullanılmaktadır. CFRP ile geliştirilen onarım ve güçlendirme detaylarında önemli olan tasarım kriterlerinden biri CFRP elemanların yüzeyden soyulmalarını geciktirmektir. Bu amaçla CFRP ile geliştirilen güçlendirme detaylarında ankrajların kullanılması artış göstermiştir. Güçlendirme detaylarında kullanılan fan tipi CFRP ankrajlı CFRP şeritler ile ilgili gerilme-kayma deplasmanı modellerinin ankrajsız CFRP şeritlere göre çok daha sınırlı sayıda olduğu görülmektedir. Bu konudaki sınırlı sayıdaki çalışmada ankrajlar CFRP şeritlere uygulanan eksenel çekme kuvvetine göre 90o açılı olacak şekilde yerleştirilmiştir. Yapılan literatür taramasında eksenel yüke göre değişik açılarda yerleştirilen ankrajlı CFRP şeritlerin eksenel kuvvet taşıma gücü ve gerilme kayma deplasmanı modelleri ile ilgili bir çalışmaya rastlanmamıştır. Bu nedenle deneysel bir çalışma düzenlenmiş ve 28 adet beton yüzeyine yapıştırılan açılı ankrajlı CFRP şerit deney elemanı eksenel çekme kuvveti etkisinde yazarlar tarafından tasarlanan bir deney düzeneği kullanılarak test edilmiştir. Deneysel çalışmada incelenen değişkenler CFRP şerit genişliği ve CFRP şeritler üzerindeki CFRP fan tipi ankrajların açılarıdır. Deneysel çalışma sonucunda açılı ankrajlı CFRP şeritlerin maksimum taşıma gücü değerlerinin hesaplanması için bir denklem ve yeni bir gerilme kayma deplasmanı modeli önerilmiştir.
Citation Count: Dinckal, Cigdem; Toreyin, Bechet Ugur; Kucukali, Serhat (2017). Adaptive decision fusion based framework for short-term wind speed and turbulence intensity forecasting: case study for North West of Turkey, Turkish Journal Of Electrical Engineering And Computer Sciences, 25(4), 2770-2783.
Adaptive decision fusion based framework for short-term wind speed and turbulence intensity forecasting: case study for North West of Turkey
(Tubitak Scientific & Technical Research Council Turkey, 2017) Dinçkal, Çiğdem; Töreyin, Behçet Uğur; Küçükali, Serhat; 20413; 26773
In this paper, an online learning framework called adaptive decision fusion (ADF) is employed for short-term wind speed and turbulence intensity forecasting by use of wind speed data for each season for the city of Izmit, located in the northwest of Turkey. Fixed-weight (FW) linear combination is derived and used for comparison with ADF. Wind speeds and turbulence intensities are predicted from the existing wind speed data and computed turbulence intensities, respectively, using the ADF and FW methods. Simulations are carried out for each season and the results are tested on mean absolute percentage error criterion. It is shown that the proposed model captured the system dynamic behavior and made accurate predictions based on the seasonal wind speed characteristics of the site. The procedure described here can be used to estimate the local velocity and turbulence intensity in a wind power plant during a storm.
Citation Count: Acehan, Ayşegül Özden;...et.al. (2021). "Ahşap Bağlantı Noktalarında Mekanik Ankraj Sayısı ve Yerleşim Şeklinin Kayma Gerilmesi-Kayma Deplasmanı Davranışı Üzerindeki Etkilerinin Deneysel Olarak İncelenmesi", Uluslararası Mühendislik Araştırma ve Geliştirme Dergisi, Vol.13, No.1, pp.1-12.
Ahşap Bağlantı Noktalarında Mekanik Ankraj Sayısı ve Yerleşim Şeklinin Kayma Gerilmesi-Kayma Deplasmanı Davranışı Üzerindeki Etkilerinin Deneysel Olarak İncelenmesi
(2021) Acehan, Ayşegül Özden; Mercimek, Ömer; Ghoroubi, Rahim; Anıl, Özgür
Ahşap yapılar ve yapı elemanlarında yapıştırıcı ve mekanik bağlantı elemanları ile bir araya getirilmiş birleşim bölgerinin genel yük-deplasman davranışı, kayma gerilmesi- kayma deplasmanı davranışları, yapısal sistemin kapasitesi ve göçme mekanizmaları üzerinde son derece etkilidir. Ahşap-ahşap bağlantı bölgelerinin davranışları, malzemenin mekanik özelliklerine, yapısına ve türüne göre çok büyük oranda değişim gösteren farklı kayma gerilmesi-kayma deplasmanı davranışları sergileyen, incelenmesi gerekli olan önemli bir konudur. Ahşap yapı elemanlarının yapıştırıcı ve yapıştırıcı ile birlikte mekanik ankrajlar ile birleştirilmesi durumunda genel yük-deplasman davranışlarının, bağlantı bölgesindeki gerilme dağılımları ile kayma gerilmesi - kayma deplasmanı davranışlarının incelendiği kapsamlı bir deneysel çalışmaya literatürde rastlanmamıştır. Bu nedenle deneysel bir çalışma planlanmıştır. Bu çalışma kapsamında birbirlerine yapıştırıcı ve yapıştırıcı ile birlikte mekanik ankrajlar ile bağlanmış olan, kenetlenme uzunlukları 180, 240 ve 350 mm olarak değişim gösteren ahşap bağlantı bölgelerinin, eksenel çekme yükü etkisi altındaki genel yük deplasman davranışları deneysel olarak incelenmiştir. Ayrıca çalışma kapsamında birleşim bölgesinde kullanılan mekanik ankraj sayısı ve yerleşiminin değişim göstermesinin, genel yük-deplasman davranışı ve kayma gerilmesi-kayma deplasmanı davranışları üzerindeki etkileri de araştırılmıştır.
Citation Count: Uzuntarla, F.; Kücükali, S.; Uzuntarla, Y. (2020). "An analysis on the relationship between safety awareness and safety behaviors of healthcare professionals, Ankara/Turkey", Journal of Occupational Health, Vol. 62, No. 1.
An analysis on the relationship between safety awareness and safety behaviors of healthcare professionals, Ankara/Turkey
(2020) Uzuntarla, F.; Kücükali, S.; Uzuntarla, Y.; 20413
Objectives: This descriptive study aims to examine the relationship between the safety awareness of healthcare professional and their safety behaviors. Methods: The study was carried out on 418 healthcare professionals working in a training and research hospital in Ankara/Turkey. The survey method was used as data collection tool. The questionnaire consisted of 3 sections and 18 questions. First section consisted of questions on sociodemographic characteristics and, second section consisted of the awareness scale and third section consisted of safety behaviors scale. Results: The safety awareness and safety behaviors are scored on a scale from 1 (completely disagree) to 5 (completely agree). The safety awareness and safety behaviors has an average score of 3.85 ± 0.81 and 3.56 ± 0.82, respectively. The safety awareness and safety behavior levels of healthcare professionals were found to be high. Conclusion: A significant positive correlation was found between safety awareness and safety behaviors and it was concluded that the increase in safety awareness led to an increase in safety behavior. © 2020 The Authors. Journal of Occupational Health published by John Wiley & Sons Australia, Ltd on behalf of The Japan Society for Occupational Health
Citation Count: Almusawi, Ali; Shoman, Sarmad; Lupanov, Andrei P.;...et.al. (2023). "Assessment of the effectiveness and the initial cost efficiency of hot recycled asphalt using polymer modified bitumen", Case Studies in Construction Materials; Vol.18
Assessment of the effectiveness and the initial cost efficiency of hot recycled asphalt using polymer modified bitumen
(2023) Almusawi, Ali; Shoman, Sarmad; Lupanov, Andrei P.
The drastic increase in environmental concerns and increasing costs of road construction materials necessitate evaluating some alternative solutions. One of the most suitable alternatives is recycling old asphalt pavement to produce reclaimed asphalt pavement (RAP). The RAP materials have been commonly combined with asphalt mixtures during pavement construction. Incorporating RAP material should demonstrate an equivalent or better performance than conventional asphalt mixtures. Conversely, the inclusion of RAP mainly needs to improve performance compared to conventional asphalt mixtures. The key issue of using RAP is to restore the loss properties of aged materials and normally asphalt Agent Rejuvenator (ARA) was used. Also, adding polymers with RAP into the asphalt mixture becomes necessary to obtain the required performance. This study investigated the RAP effects of elastomeric polymer on the performance of the asphalt mixture following Russian standards (GOST). The impact of using PMB with RAP material on the asphalt mixture's performance was primarily considered by employing tests that can reveal the adhesion property. Additionally, the performance of the pavement was evaluated in terms of strength and low-temperature cracking. For this purpose, numerous test methods were implemented to appraise the asphalt performance, such as compressive strength, moisture susceptibility, shear resistance, tensile strength, porosity of the mineral particles, and residual porosity. The results indicated that the overall performance of the asphalt mixtures prepared with RAP and combined with polymer depicted a better performance. Moreover, the initial construction cost for each asphalt composition was estimated and compared. The utilization of PMB increased the cost of the asphalt mixture. However, such an increase in the cost would lead to an increase in the overall performance, especially for RAP mixtures.
Citation Count: Mercimek, Ömer. (2021). "Birden Fazla Boşluklu Çift Doğrultulu Betonarme Döşemelerin Zımbalama Performansının İyileştirilmesi için Tekstil ile Güçlendirilmiş Sıva Şeritler ile Güçlendirilmesi", Uluslararası Mühendislik Araştırma ve Geliştirme Dergisi, Vol.13, No.2, pp.573-582.
Birden Fazla Boşluklu Çift Doğrultulu Betonarme Döşemelerin Zımbalama Performansının İyileştirilmesi için Tekstil ile Güçlendirilmiş Sıva Şeritler ile Güçlendirilmesi
(2021) Mercimek, Ömer; Ghoroubi, Rahim; Anıl, Özgür; Baran, Mehmet
Betonarme kirişsiz döşemelerde meydana gelebilecek olan ani ve gevrek bir şekilde, hiçbir deformasyon belirtisi göstermeden oluşan zımbalama göçme mekanizması yapı içerisinde yaşayanlara zarar verebilecek son derece tehlikeli bir göçme şeklidir. Bu nedenle tasarım aşamasında kaçınılan göçme mekanizmalarının başında gelmektedir. Betonarme döşemelerde havalandırma, elektrik veya dogalgaz gibi alt yapı sistemlerinin geçirilmesi veya merdiven ya da asansör boşluğu gibi mimari zorunluluklar nedeniyle bırakılan boşlukların, döşemelerin zımbalama dayanımını ve davranışını olumsuz etkilediği bilinmektedir. Ancak birden fazla boşluklu çift doğrultulu betonarme döşemelerin zımbalama yüklemesi etkisi altındaki davranışının incelendiği bir araştırmaya literatürde rastlanmamıştır. Bu nedenle betonarme çift doğrultulu döşemelerde birden fazla boşluğun döşemelerin zımbalama davranışı üzerindeki olumsuz etkilerinin belirlenmesi ve boşlukların meydana getirdiği davranış problemlerinin azaltılabilmesi için tekstil ile takviye edilmiş sıva şeritler ile döşemelerin güçlendirilmesinin incelendiği deneysel bir çalışma planlanmıştır. Bu çalışma kapsamında biri boşluksuz referans elemanı, 4 deney elemanı ise 300x300 mm boyutlarında kare kesitli iki adet boşluklu olacak şekilde toplamda 5 döşeme deney elemanı üretilmiştir. Boşluklu deney elemanlarının ikisi tekstil ile güçlendirilmiş sıva katmanlı (TGSK) şeritler ile güçlendirilerek deney elemanlarının zımbalama davranışı üzerinde boşlukların meydana getirdiği olumsuz etkilerin ne ölçüde iyileştirilebildiği deneysel olarak araştırılmıştır. Çalışma kapsamında TGSK şeritler ile geliştirilen ve uygulanan güçlendirme metodunun döşemelerin zımbalama dayanımını önemli ölçüde artırdığı, boşlukların meydana getirdiği olumsuz etkileri sınırlandırdığı görülmüştür.
Citation Count: Gültop, T.; Yılmaz, M.; Alyavuz, B. (2015). "Çarpma Yükü Altındaki Rijit Plastik Kirişlerin Analitik Olarak İncelenmesi", Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi, Vol.30, No.1, pp.87-94.
Çarpma Yükü Altındaki Rijit Plastik Kirişlerin Analitik Olarak İncelenmesi
(2015) Gültop, Tekin; Yılmaz, Mahmut; Alyavuz, Bahadır; 5168
Kirişler, kullanım ömürleri boyunca dinamik bir yükleme türü olan çarpma yüklerine maruz kalabilirler. Bu çalışmada kirişlerin düşük hızlı çarpma yükü etkisi altındaki davranışları analitik olarak incelenmiştir. Basit ve ankastre mesnetli kirişler, rijit plastik davranış kabulü yapılarak dinamik yükler altında incelenmiştir. Göçme mekanizmasının ani olarak plastik mafsal oluşumuyla gerçekleştiği kabul edilmiş, enerji ve momentumun korunma ilkeleri dikkate alınarak dinamik yük altında kirişlerin limit analizi yapılmıştır. Darbe yükü altındaki rijit plastik kiriş davranışı, benzer yükleme koşulları altındaki elastik kiriş davranışıyla karşılaştırılmıştır.
Citation Count: İbiş, Ahmet Buğra;...et.al. (2022). "Determination of Optimum Bitumen Content in Porous Asphalt Pavement by Different Methods", Usak University Journal of Engineering Sciences, Vol.5, No.1, pp.13-27.
Determination of Optimum Bitumen Content in Porous Asphalt Pavement by Different Methods
(2022) İbiş, Ahmet Buğra; Şengöz, Burak; almusawi, Ali; Kaya Özdemir, Derya; Topal, Ali
In recent years, studies on porous asphalt have gained more importance and countries are conducting various studies in order to improve the engineering properties of this type of pavement. As a result of these studies, each country developed its own standard and therefore different optimum bitumen content (OBC) determination methods emerged. This paper investigates the determination of the optimum bitumen content of porous asphalt samples prepared by using different aggregate types and polymers by the methods implemented in Turkey and in other countries. The results have shown that the application of each method yielded different bitumen content.
Citation Count: Almusawi, Ali;...et.al. (2022). "Economic and environmental impacts of utilizing lower production temperatures for different bitumen samples in a batch plant", Case Studies in Construction Materials, Vol.16.
Economic and environmental impacts of utilizing lower production temperatures for different bitumen samples in a batch plant
(2022) Almusawi, Ali; Sengoz, Burak; Ozdemir, Derya Kaya; Topal, Ali
The utilization of hot mix asphalt (HMA) for road construction necessitates high temperatures during mixing bitumen and aggregate at asphalt plant. The required (mixing) production temperature is calculated by the standard method (ASTM 2493). The application of this method for polymer modified bitumen (PMB) and warm mix asphalt (WMA) have tendency of higher temperatures. Therefore, some alternative methods suggested by literatures for the determination of production temperature for PMB and WMA have been implemented aiming to determine lower temperatures than the standard method (ASTM 2493). Moreover, the economic impacts of the determined production temperatures through different models are evaluated by the estimation of energy consumption in terms of electricity and natural gas costs for the batch type asphalt plants. Besides, the possible environmental effects are calculated by considering the carbon dioxide emissions. The results of this study have shown that the reduction in production temperatures led to a significant decrease in the total construction cost of each type of asphalt and a significant reduction in the estimated carbon dioxide emission. The results of this study can be used as a reference point for the estimation of both economic and environmental impacts of utilizing lower production temperatures for different bitumen samples.
Citation Count: Bartan, Ayfer; Kucukali, Serhat; Ar, Irfan (2017). Environmental impact assessment of coal power plants in operation, Conference: International Conference on Advances in Energy Systems and Environmental Engineering (ASEE), International Conference On Advances in Energy Systems And Environmental Engineering (Asee17), 22.
Environmental impact assessment of coal power plants in operation
(E D P Sciences, 2017) Bartan, Ayfer; Küçükali, Serhat; Ar, İrfan; 20413
Coal power plants constitute an important component of the energy mix in many countries. However, coal power plants can cause several environmental risks such as: climate change and biodiversity loss. In this study, a tool has been proposed to calculate the environmental impact of a coal-fired thermal power plant in operation by using multicriteria scoring and fuzzy logic method. We take into account the following environmental parameters in our tool: CO, SO2, NOx, particulate matter, fly ash, bottom ash, the cooling water intake impact on aquatic biota, and the thermal pollution. In the proposed tool, the boundaries of the fuzzy logic membership functions were established taking into account the threshold values of the environmental parameters which were defined in the environmental legislation. Scoring of these environmental parameters were done with the statistical analysis of the environmental monitoring data of the power plant and by using the documented evidences that were obtained during the site visits. The proposed method estimates each environmental impact factor level separately and then aggregates them by calculating the Environmental Impact Score (EIS). The proposed method uses environmental monitoring data and documented evidence instead of using simulation models. The proposed method has been applied to the 4 coal-fired power plants that have been operation in Turkey. The Environmental Impact Score was obtained for each power plant and their environmental performances were compared. It is expected that those environmental impact assessments will contribute to the decision-making process for environmental investments to those plants. The main advantage of the proposed method is its flexibility and ease of use.
Citation Count: Yıldız, Ali; Martı, Ali İhsan; Göğüş, Mustafa. (2023). "Farklı savak yüksekliğine ve konfigürasyona sahip dairesel labirent savakların deneysel modellenmesi", Gümüşhane Üniversitesi Fen Bilimleri Dergisi, Vol.13, No.2, pp.373-385.
Farklı savak yüksekliğine ve konfigürasyona sahip dairesel labirent savakların deneysel modellenmesi
(2023) Yıldız, Ali; Martı, Ali İhsan; Göğüş, Mustafa; 6062
Labirent savaklar plan görünümünde zikzaklı geometrilerinden dolayı, doğrusal savaklara göre baraj gövdesinde veya yerleştirildiği kanallarda daha az genişliğe ihtiyaç duyarlar. Bu çalışmada yarım daire şeklindeki labirent savakların içerdikleri göz sayılarının (N) ve yüksekliklerinin (P) debi verimine olan etkisi incelenmiştir. Yarım daire şeklindeki labirent savaklar üçgen ve trapez labirent savakların aksine, kesişim köşelerindeki akış kapasitesini azaltan bölgeleri daha verimli hale getirerek ve akışın savak duvarlarına daha dik doğrultuda hareket etmesini sağlayarak deşarj verimini arttırırlar. Deneyler dairesel savaklar için içerdikleri yarım daire sayısına bağlı olarak (N=2, 3 ve 4) olarak 3 farklı konfigürasyon üzerinde yürütülmüştür. Bütün konfigürasyonlarda toplam 3 adet savak yüksekliği (P=0.20, 0.30 m ve 0.40 m) kullanılmış olup 9 adet deney seti hazırlanmıştır. Ayrıca dairesel savaklardan elde edilen sonuçlara referans oluşturması amacıyla doğrusal savaklar ile 3 farklı savak yüksekliğinde (P=0.20, 0.30 m ve 0.40 m) deneyler yapılmış olup toplamda 12 adet deney yapılmıştır. Dairesel savakların içerdiği göz sayısı (N) arttıkça debi verimi düşmüştür ve yüksekliğin debi verimi üzerine belirgin bir etkisi olmamıştır. Dairesel labirentler savak deneylerinden elde edilen sonuçlar önceki çalışmalar ile karşılaştırılmış ve yarım daire labirent savakların, üçgen kesitli labirent savaklara göre daha yüksek debi-deşarj kapasitesine sahip olduğu görülmüştür. Ayrıca yarım daire şeklindeki labirent savaklar aynı kanal genişliğinde üçgen forma göre daha uzun efektif kret uzunluğu sağlamışlardır ve aynı savak yükünde yüksek debi geçirmişlerdir.
Citation Count: Dinçkal, Ç. (2016). "Finite Element Modeling for Vibration of Initially Stressed Non- local Euler-Bernoulli Beams", Celal Bayar Üniversitesi Fen Bilimleri Dergisi, Vol.12, No.3, pp.399-412.
Finite Element Modeling for Vibration of Initially Stressed Non- local Euler-Bernoulli Beams
(2016) Dinçkal, Çiğdem; 26773
This paper is concerned with a precise finite element model for vibration analysis of initially stressed micro/nano beams based on nonlocal Euler-Bernoulli and Eringen's nonlocal elasticity theory. For this purpose analytical solutions for the exact dynamic shape functions has been derived by also use of Hamiltonian's principle for the governing equations. The solution is applicable to various initial stresses such as tensile and compressive and scaling effect. The exact dynamic shape functions have been constructed to obtain analytic expressions for the exact dynamic element stiffness matrix components. Numerical results are displayed to indicate the effects of initial stresses and scaling effect parameters on the vibration characteristics of initially stressed clamped nonlocal Euler-Bernoulli beams. For the first time in literature, this study presents such an element formulation that it provides adequate and accurate representation of the vibration behavior of initially stressed micro/nano beams based on nonlocal Euler-Bernoulli beam theory.
Citation Count: Taştan, Kerem; Yıldırım, Nevzat (2021). "Flow Rate along the Length of the Swirling Vortex Axis at an Intake", Teknik Dergi, Vol. 32, No. 4.
Flow Rate along the Length of the Swirling Vortex Axis at an Intake
(2021) Taştan, Kerem; Yıldırım, Nevzat; 12654
In this study, the characteristics of the flow in the region of swirling vortex are examined. The potential flow model based on the summing infinite number of spherical sinks along the vortex core is introduced to predict the flow field and the flow rate along the vortex axis. The flow towards the swirling vortex core has considerable effects on the radial velocity distribution within the ambient fluid flow region near the intake. The agreement between available test data relating to the radial velocity and the method introduced in this study is found to be satisfactory.
Citation Count: Özel, Halil Fırat; Saritaş, A. (2022). "Frame finite element model for nonlinear and vibration analysis of steel structures with Beam-Column and Column-Base Semi-Rigid Connections", Journal of the Faculty of Engineering and Architecture of Gazi University, Vol.37, No.3, pp.1609-1623.
Frame finite element model for nonlinear and vibration analysis of steel structures with Beam-Column and Column-Base Semi-Rigid Connections
(2022) Özel, Halil Fırat; Saritaş, Afşin; 237150
In this paper, a shear deformable force-based frame finite element with semi-rigid connections is derived for nonlinear analysis of steel structures. Distributed plasticity approach is defined along element length and section depth, and linear or non-linear semi-rigid connection behavior can be specified anywhere along elements without the necessity to define additional nodes and to increase the degrees of freedom of the structural system. To perform vibration analyses with similar accuracy, force-based consistent mass matrix is used considering semi-rigidity in connections and an appropriate shear correction coefficient for I-sections. The element formulation is presented in 2 dimensions to simplify the formulation, and numerical validation and comparison studies are carried out on complex and irregular structures in 2-D and 3-D. In models with semi-rigid connections, the effect of nonlinear behavior on the structural system has been studied in both beam-column and column-bases. In the presented examples, it was possible to push structures higher than the existing displacements, and it was revealed that the nonlinear behavior in the column-base connections could create much more critical results for the structural systems with P-Delta effects. In addition, high-level accuracy results were obtained when performing vibration analyses with the application of force-based consistent mass matrix.
Citation Count: Dinçkal, Çiğdem. (2018). "Initial value problems spreadsheet solver using VBA for engineering education", Fundamental Journal of Mathematics and Applications, Vol.1, No.1, pp.88-101.
Initial value problems spreadsheet solver using VBA for engineering education
(2018) Dinçkal, Çiğdem; 26773
Spreadsheet solver using VBA programming has been designed for solving initial value problems (IVPs), analytically and numerically by all Runge-Kutta (RK) methods including also fifth order with calculation of true percent relative error for corresponding RK method. This solver is user-friendly especially for beginner users of Excel and VBA.
Citation Count: Germanovich, Leonid N...et al (2015). "Measuring fluid flow and heat output in seafloor hydrothermal environments", Journal of Geophysical Research: Solid Eart, Vol. 120, No. 12, pp. 8031-8055.
Measuring fluid flow and heat output in seafloor hydrothermal environments
(2015) Germanovich, Leonid N.; Hurt, Robert S.; Smith, Joshua E.; Genç, Gence; Lowell, Robert P
We review techniques for measuring fluid flow and advective heat output from seafloor hydrothermal systems and describe new anemometer and turbine flowmeter devices we have designed, built, calibrated, and tested. These devices allow measuring fluid velocity at high- and low-temperature focused and diffuse discharge sites at oceanic spreading centers. The devices perform at ocean floor depths and black smoker temperatures and can be used to measure flow rates ranging over 2 orders of magnitude. Flow velocity is determined from the rotation rate of the rotor blades or paddle assembly. These devices have an open bearing design that eliminates clogging by particles or chemical precipitates as the fluid passes by the rotors. The devices are compact and lightweight enough for deployment from either an occupied or remotely operated submersible. The measured flow rates can be used in conjunction with vent temperature or geochemical measurements to obtain heat outputs or geochemical fluxes from both vent chimneys and diffuse flow regions. The devices have been tested on 30 Alvin dives on the Juan de Fuca Ridge and 3 Jason dives on the East Pacific Rise (EPR). We measured an anomalously low entrainment coefficient (0.064) and report 104 new measurements over a wide range of discharge temperatures (5°-363°C), velocities (2-199 cm/s), and depths (1517-2511 m). These include the first advective heat output measurements at the High Rise vent field and the first direct fluid flow measurement at Middle Valley. Our data suggest that black smoker heat output at the Main Endeavour vent field may have declined since 1994 and that after the 2005-2006 eruption, the high-temperature advective flow at the EPR 9°50′N field may have become more channelized, predominately discharging through the Bio 9 structure. We also report 16 measurements on 10 Alvin dives and 2 Jason dives with flow meters that predate devices described in this work and were used in the process of their development. This includes the first advective measurements in the Lau Basin and at the EPR 9°39.5′N. We discuss potential error sources and how they may affect the accuracy of measurements by our devices and other devices. In particular, we use the turbulent plume theory to evaluate the effect of entrainment of ambient seawater. ©2015. American Geophysical Union. All Rights Reserved.
Citation Count: İbiş, Ahmet Buğra...et al. (2024). "Mechanical Characteristics of Environmentally Friendly Permeable Pavement: Enhanced Porous Asphalt", Jordan Journal of Civil Engineering, Vol. 18, No. 2, pp. 212-223.
Mechanical Characteristics of Environmentally Friendly Permeable Pavement: Enhanced Porous Asphalt
(2024) İbiş, Ahmet Buğra; Şengöz, Burak; Almusawi, Ali; Özdemir, Derya Kaya; Topal, Ali
This study explores the mechanical properties of porous-asphalt pavement, focusing on the influence of various polymers (elastomeric and reactive elastomeric terpolymers) and different aggregate compositions. Two aggregates were utilized: one is exclusively limestone-based and the other is a blend of limestone and basalt aggregates. The research findings unveiled that mixtures containing the conventional bitumen failed to meet the Cantabro loss-test criterion required for porous asphalt, necessitating a maximum threshold of 20%. In contrast, asphalt mixtures modified with polymers exhibited notably superior performance, particularly in terms of permeability, Cantabro loss and the ratio of indirect tensile strength. These results underscore the significant impact of polymer modification on enhancing the crucial mechanical properties of porous asphalt. Therefore, the study suggests the adoption of polymer-modified asphalt as a viable strategy to improve pavement longevity and overall performance, promoting its use for sustainable and durable infrastructure.
Citation Count: Dinçkal, Çiğdem. (2017). "New predictor-corrector type iterative methods for solving nonlinear equations", Sakarya University Journal of Science, pp.464-468.
New predictor-corrector type iterative methods for solving nonlinear equations
(2017) Dinçkal, Çiiğdem; 26773
This paper proposes two new predictor-corrector type iterative methods for finding roots of nonlinear equations. These methods are generated by based on the combination of the two well known Bisection method and Newton-Raphson method. Various numerical examples serve to verify the main purpose of these methods and compare the numerical results. Numerical results are also presented to test the convergence rate of these new proposed methods in terms of number of iterations achieved to reach the exact root of any nonlinear equation. These numerical results obtained also indicate that new proposed methods perform better than both well known methods Bisection and Newton-Raphson and also the other methods in literature.