Yazarlar
- Yurdakul, Muhammet(10)
- Cuce, Erdem(9)
- Ergün, Mustafa(8)
- Artar, Musa(7)
- Ates, Sevket(5)
- Cuce, Pinar Mert(5)
- Cakici, Ziya(4)
- Demirtaş, Betül(4)
- Murat, Yetis Sazi(4)
- Tayfur, Bilal(4)
- Tonyali, Zeliha(4)
- Aymelek, Abdullah(3)
- Can, Ömer(3)
- Kiral, Adnan(3)
- Türker, Temel(3)
- Türkmen, Mutlu(3)
- Yanik, Yusuf(3)
- Alacadağlı, Esmeray(2)
- Apak, Ömer Ceyhun(2)
- Ateş, Şevket(2)
- Azimkhani, Amin(2)
- Ergun, Mustafa(2)
- Guleryuz, Didem(2)
- Kara, Adnan(2)
- Ozden, Erdemalp(2)
- Saatchian, Vahid(2)
- Tapkın, Serkan(2)
- Tercan, Emre(2)
- Tozlu, Alperen(2)
- Uyar, Mehmet(2)
- Yarımkaya, Erkan(2)
- Yildirim, Ömer(2)
- Yilmaz, Fatih(2)
- Yıldız, Seçil Gül Meydan(2)
- Şengün, Hayriye(2)
- Şentürk, İdris(2)
- Abusoglu, Aysegul(1)
- Adanur, Suleyman(1)
- Ahiskali, Adem(1)
- Alacadağli, Esmeray(1)
Yayınlar
- MakaleYalnız künye2025Scopus SJRQ1Optimized model updating and site-specific seismic assessment of a historical masonry bridge
Tayfur, Bilal
This study comprehensively evaluates an 800-year-old masonry bridge using advanced non-destructive testing techniques, an innovative model update process, and site-specific ground motion analysis. Employing Operational Modal Analysis, Ultrasonic Pulse Velocity, and Schmidt Hammer tests, the research meticulously characterized the structural dynamic properties. The preliminary finite element model was rigorously refined utilizing the Tabu Search optimization algorithm by minimizing discrepancies between numerical and experimental modal parameters. Site-specific earthquake records, carefully selected and prepared in accordance with the Turkish Building Earthquake Code, were applied to conduct detailed time-history analyses across 11 distinct ground motion records. Despite experiencing stresses approaching critical thresholds, the bridge demonstrated remarkable structural integrity. While the findings indicate the bridge’s structural soundness under current seismic hazard analysis criteria, the results notably emphasize that the frequency content similarities between the structure and ground motion are more critical for seismic performance assessment than peak ground acceleration (PGA) values, underscoring the importance of continuous monitoring given the region’s complex tectonic characteristics.
AtıfScopus5WoS3OpenAlex4
İncele - MakaleAçık Erişim2025Scopus SJRQ1Examining the serial mediating role of emotional solidarity and perceived concern in the effect of residents' community commitment on support for tourism development
Apak, Ömer Ceyhun; Taş, Muhammed; Güneş, Erkan
This paper examines the serial mediating role of emotional solidarity and perceived concern in the impact of community commitment on support for tourism development. The study is designed within the framework of the relational survey model, which is one of the quantitative research designs. The data were collected from the residents of Bayburt (Türkiye), one of the destinations in the early stages of tourism development. The residents participating in the study were informed that it was voluntary. Thus, the study was conducted on a total of 423 samples. SPSS and PROCESS macros Model 6 were used to analyze the data in the study. As a result of the study, community commitment and emotional solidarity were positive, and perceived concern was negatively related to support for tourism development. In addition, it was determined that emotional solidarity and perceived concern significantly mediate the effect of community commitment on support for tourism development.
AtıfScopus5WoS5OpenAlex5İncele - MakaleAçık Erişim2025Scopus SJRQ3Measuring the Effectiveness of Post-Earthquake Social Policies Using the Intuitionistic Fuzzy SIWEC Method: The Case of the February 6 Kahramanmaraş Earthquakes; [Sezgisel Bulanık SIWEC Yöntemi Kullanılarak Deprem Sonrası Sosyal Politikaların Etkinliğinin Ölçülmesi: 6 Şubat Kahramanmaraş Depremleri Örneği]
Keskin, Abdurrahman; Kara, Mehmet Akif; Keskin, Abdulkadir; Besoluk, Erdal
This study aims to evaluate the effectiveness of social policies implemented in the aftermath of the February 6, 2023, Kahramanmaraş earthquakes. The research employed the Intuitionistic Fuzzy SIWEC technique, a multi-criteria decision making method. Eight experts with substantial field experience evaluated seven main criteria and forty-four sub-criteria. The findings indicate that social policies—particularly in the "food and basic needs" category (covering clean drinking water, hygiene products, the food supply chain, food safety, and the provision of special nutritional needs) and, more broadly, policies within the "health and education services" category—have been implemented successfully. In contrast, under the "employment and social security" category, efforts to combat informality, provide vocational training, grant tax exemptions, and support SMEs were deemed inadequate. Similarly, within the "basic infrastructure and public services" category, notable deficiencies were identified in urban planning and construction, in ensuring transparency and fairness in public social policies, and in restoring telecommunication and internet infrastructure. In addition policies targeting vulnerable groups and psychosocial support services were found to be relatively neglected.
AtıfOpenAlex1
İncele - MakaleAçık Erişim2025Scopus SJRQ3A review and classification of conventional, advanced, smart and multifunctional glazing technologies for low-carbon building applications
Cuce, Pinar Mert; Guclu, Tamer; Cuce, Erdem
In this study, various smart window technologies are introduced, examined in terms of energy efficiency, and their advantages over existing conventional windows are presented. Smart window technologies used today are more energy efficient than traditional single and double-glazing windows. It is possible to achieve up to 80% energy savings in building heating/cooling costs compared to traditional window technologies, with a correctly selected and applied smart window technology depending on various external factors such as building facade, climatic conditions and window area. Therefore, smart windows technologies play a leading role in the realisation of nearly/zero energy building goals.
AtıfScopus1WoS1OpenAlex1İncele - MakaleAçık Erişim2024Seismic behavior assessment of RC buildings controlled by passive and active techniques
Uyar, Mehmet; Ergün, Mustafa
In this paper, a numerical study was carried out on the effectiveness of the active earthquake control method in improving the earthquake response of RC buildings. High damping rubber bearing design was made according to the criteria of the Uniform Building Code. Three different types of isolators were obtained geometrically. Passive earthquake control of the building was provided by placing these isolators under the columns. For active earthquake control of the building, controller design was realized by integrating it into the FE transient analysis in ANSYS. The active earthquake control design was studied using a force-based and displacement-based controller with acceleration and displacement feedback. The linear dynamic earthquake analysis in the time history of all three states of the building (un-controlled, passive, and active-controlled) was made using the acceleration record of the Seferihisar (İzmir) earthquake. When the results are examined, it is seen that the active earthquake control method provides almost all of the positive behavior expected from the passive earthquake control method. In addition, it eliminates some of the disadvantages of the passive earthquake control method.
AtıfOpenAlex1İncele - MakaleAçık Erişim2024Ahşap Bazlı Kompozit Yüzey Kaplı Yonga Levhaların Formaldehit Gaz Emisyonu ve Uygulanan Standartlar
Ayata, Ümit; Camlibel, Osman; Bostancıoğlu, Ayşe; Yüksek, Damla
Her geçen gün kullanım alanı artan ahşap bazlı kompozit malzemeler beraberinde birtakım hava kirletici kimyasal maddeler de getirmektedir. Özellikle ahşap esaslı kompozit levhalarda, kapalı ortam kirleticisi olarak isimlendirilen formaldehit içerikli reçine kimyasal maddeler kullanılmaktadır. Formaldehit esaslı reçinelerle üretilmiş ürünlerde zamanla levhalardan salınım formaldehit gaz emisyonu oluşabilmektedir. İnsan sağlığına zararlı olan bu kimyasal maddenin üretimi ve kullanımı sırasında uyulması gereken kurallar ve ülkelerin bu konuyla ilgili belirledikleri standartlar mevcuttur. Bu çalışmada mobilya atölyelerinden üretici firmaların levhaları, örnekleme secim metodu ile 8 mm ve 18 mm yongalamlar alınmış ve bu levhaların formaldehit emisyonu TS 4894 EN 120 ölçüm yöntemlerine göre analiz edilmiştir. Bu analiz sonucunda 18 mm yongalamların en düşük formaldehit gaz emisyonu 4,80 mg/100 g sonuçla E1 sınıfında yer almıştır.
AtıfOpenAlex1TR Dizin1İncele - MakaleAçık Erişim2024Belediyelerin stratejik planlarının kalkınma planıyla ilişkisi: 11. kalkınma planı üzerinden 3 büyük kent üzerine bir araştırma
Kantar, Gokmen; Kan, Muhammed Enes
Devletin ekonomi, sağlık, adalet, güvenlik, istihdam, eğitim, sosyal hizmetler, ulaşım gibi hemen her konusuna ilişkin gelecekte ulaşmak istediği hedeflerin, politika ve tedbirlerin yer aldığı kalkınma planlarının başarıyla ulaşmasında ülkedeki diğer kurumların amaç ve hedeflerinin bu plana uygunluğu oldukça önemlidir. Ulusal stratejik amaç ve hedeflerin yer aldığı kalkınma planları ile yerel stratejik amaç ve hedeflerin belirlendiği stratejik planlar arasındaki uyum da bu anlamda oldukça değerlidir. Bu düşünceden yola çıkılarak yapılan bu çalışmanın amacı kalkınma planları ile yerel yönetimlerin stratejik planları arasındaki uyumun incelenmesidir. Çalışma Türkiye’nin 11. Kalkınma Planı ile Türkiye’nin nüfus bakımdan en kalabalık şehirleri olan Ankara, İstanbul ve İzmir Büyükşehir Belediyesi 2020-2024 Stratejik Planları ile sınırlandırılmış, söz konusu planlar arasındaki uyum incelenmiştir. 11. Kalkınma Planı’nda doğrudan yerel yönetimlere ilişkin düzenlemeleri içeren “Yaşanabilir Şehirler, Sürdürülebilir Çevre” başlığı altındaki düzenlemeler Ankara, İstanbul ve İzmir Büyükşehir Belediyeleri Stratejik Plan’larında araştırılmıştır. Çalışmada veri toplama yöntemi olarak doküman incelemesi yöntemi kullanılmış, kalkınma planı ve stratejik planlardan elde edilen veriler NVIVO 14 paket programının da yardımıyla içerik analizine tabi tutulmuştur. Çalışma sonucunda stratejik planların genel hatları ile 11. Kalkınma Planı ile uyumlu olduğu tespit edilmiştir. Buna rağmen KÖYDES-KIRDES gibi yerel yönetimleri ilgilendiren ulusal projelere stratejik planlarda yer verilmemesi, kalkınma ajansları, KOSGEB gibi uzmanlık kuruluşları ve ilgili bakanlıklar ile işbirliğine yönelik herhangi bir düzenlemensin yer alamaması stratejik planlarda önemli bir eksiklik olarak tespit edilmiştir
AtıfOpenAlex1TR Dizin1İncele - MakaleAçık Erişim2024L Tipi Matris ve Fine-Kinney Metodları Kullanılarak Erzurum Havalimanı’nın Çevresel Risk Değerlendirmesi
Kul, Sinan; İrdemez, Şahset; Ozdemir, Mustafa; Bedir, Ferdin
Dünya ekonomisinde önemli bir yeri olan havacılık sektörü diğer birçok sektör ile karşılaştırıldığında çok daha yüksek bir büyüme oranına sahiptir. Günümüzde küresel sera gazı emisyonlarının yaklaşık %2'sinin bu sektörden kaynaklandığı ve ilerleyen yıllarda bu emisyonların sektörün büyüme oranları ile paralel olarak artacağı düşünülerek gerekli tedbirlerin vakit kaybetmeden alınması yerinde olacaktır. Havalimanlarının inşaat faaliyetleri süresince ekosistem olumsuz olarak etkilenirken, havalimanı altyapılarının yüksek enerji ihtiyaçları, işletme aşamasında oluşan önemli miktarlardaki atık maddeler, havalimanı operasyonlarından kaynaklanan gürültü emisyonları vb. nedenler yerel halkın refahını önemli ölçüde etkileyebilmektedir. Havalimanlarında yürütülen uygulamaların çevreyi ve yerel halkı etkilediği göz önünde bulundurulduğunda, ekonomik gerekçeleri bahane etmeden havalimanlarının yönetimleri tarafından düzeltici önlemlerin uygulamaya alınması gerekmektedir. Bu çalışmada bahsi geçen çevresel problemler değerlendirilerek, Erzurum Havalimanı’nın işletilmesi sürecinde, risk değerlendirmesi yapılması ve çevresel etkilerinin belirlenmesi amaçlanmaktadır. Çalışmada çevresel risk faktörleri belirlenerek, risklerin çevreye olası etkileri L tipi matris metodu ve Fine-Kinney metodu kullanılarak ortaya konulmaya çalışılmıştır. Bu doğrultuda havalimanı bünyesinde yer alan ofis, mutfak, marangozhane, depo, bakım onarım vb. birimlerde çevresel zararlara sebep olabileceği düşünülen çevresel risk etmenleri değerlendirilmiştir. Havalimanında yapılan değerlendirmeler sonucunda L tipi matris metoduyla 11 adet orta, 243 adet katlanılabilir ve 39 adet önemsiz düzey risk tespit edilmişken, Fine-Kinney metoduyla 7 adet yüksek, 31 adet önemli, 136 olası ve 119 adet önemsiz düzey çevresel risk tespit edilmiştir. Alınacak önlemlerin, havalimanının muhtemel çevresel etkilerini büyük ölçüde düşüreceğini göstermektedir.
AtıfOpenAlex2TR Dizin2İncele - MakaleAçık Erişim2024Türkiye'de Ekonomik Kalkınma ve Karayolu Trafiğinde Yaralanma ve Ölümler Arasındaki İlişki: Mekânsal Panel Veri Analizi
Elmalı, Kübra; Pekmezci, Fatih
Günümüzde trafik kazaları dünya genelinde ve Türkiye özelinde büyük bir sorun olarak güncelliğini ve önemini korumaya devam etmektedir. Özellikle artan nüfus ve teknolojik gelişme ile birlikte ele alındığında ülkelerin gelişmişlik oranları ile yaşanan trafik kazaları arasında bir ilişki olduğu düşünülmektedir. Bu doğrultuda çalışmada trafik kazaları ve ekonomik büyüme arasındaki ilişkinin araştırılması amaçlanmış olup komşuluk ilişkilerinin de etkisinin dahil edilerek farklı bir bakış açısıyla bakılması hedeflenmektedir. Mekânsal ekonometri yardımıyla diğer illerin komşuluğunun etkisinin de modele dahil edilerek araştırıldığı çalışmada Türkiye’nin 81 iline ait 2013-2022 dönemi verileri kullanılarak uygulamalar yapılmıştır. Çalışmada bağımlı değişken olarak il düzeyinde trafik kazası sonucu oluşan yaralı sayısı değişkeni alınırken bağımsız değişken olarak ise gelir, araç sayısı oranı ve kaza sayısı oranları modele dahil edilmiştir. Modelde yer alan mekânsal ekonometrik analizler bölge komşuluğu ele alınarak yapılan uygulamalardan oluşmaktadır. Bu doğrultuda mekânsal etkiler üç farklı model altında incelenmiştir. Test sonuçlarına göre; modelde yer alan değişkenlerden gelir değişkeni ve araç oranı değişkeni trafik kazası sonucu oluşan yaralanma ile aynı yönde anlamlı bir ilişki göstermektedir.
AtıfOpenAlex1İncele - MakaleAçık Erişim2024Scopus SJRQ1District heating based on exhaust gas produced from end-of-life tires in Erzincan: Thermoeconomic analysis and optimization
Güngör, Osman; Tozlu, Alperen; Arslantürk, Cihat; Özahi, Emrah
This paper presents the thermoeconomic analysis and optimization of the Erzincan Waste Tire Recycling and Power Plant (EWTRPP) in Turkey and its waste heat-based district heating (DH) system. A thermoeconomical method, namely the specific exergy costing (SPECO), is applied to allocate cost flows through subcomponents of an actual existing plant. Besides, the obtained thermoeconomic results are improved by using an optimization method, namely non-dominant sorting genetic algorithm (NSGA-II), considering the temperature of the exhaust gas discharged to the atmosphere (T25), the thermal conductivity value of the insulation material (ki) and pipe roughness value (s). The energy and exergy efficiencies of the existing plant are found to be 27.37% and 35.57%, respectively, considering the data of the actual plant. Moreover, the energy and exergy efficiencies of the waste heat-based DH system are found to be 43.08% and 55.99%, respectively. The total cost rate of the overall system is deduced 13.98 $/hby means of SPECO method. According to the results of the NSGA-II optimization method, the exergy efficiency and total cost rate of the overall system are evaluated as 6.93% and −2.51 $/h, respectively. Furthermore, it is also proposed that 1304 dwellings can be heated owing to the DH system utilizing the existing exhaust gas.
AtıfScopus9WoS8OpenAlex7İncele - MakaleAçık Erişim2024Scopus SJRQ1A case study comparing seismic retrofitting techniques for a historically significant masonry building's minaret
Kiral, Adnan; Ergün, Mustafa; Tonyali, Zeliha; Artar, Musa; Şentürk, İdris
Historical masonry structures are extremely susceptible to earthquakes due to their characteristic features. Seismic performance and corresponding damage patterns vary between these buildings. Even though the main structure was undamaged, many minarets suffered damage or collapsed due to the transmission of large forces from the main mass to the minaret and the abrupt changes in cross-section due to the geometry of the minaret. This study uses an ancient masonry mosque as a case study, whose minaret and main building are constructed as a single structure. The mosque's minaret under seismic excitation is the focus of this study. The adopted model is called Alaeddin Bey Mosque in Muş, Türkiye. The seismic performance assessment of the minaret, considering various retrofitting options, is mainly based on four critical parameters: base shear, acceleration, displacement, and maximum tensile forces in all three dimensions. The analyzed retrofitting methods include base isolation located in the basement of the mosque, viscous dampers placed only in the upper part of the minaret, Carbon Fiber-Reinforced Polymer fabric fitted to only the minaret, and steel plates applied to only the minaret. Representative structural models of the mosque have been modelled with SAP2000 software. The main novelty of this study is the use of viscous dampers in the minaret. It is the first time a design methodology has been introduced for viscous damper applications in minarets. This methodology aims to prevent local damage to the minaret due to the forces generated by the dampers, while also considering the constraints of limited internal space within the minaret. The finding of this study shows that viscous damper application yields significantly better results compared to the application of Carbon Fiber-Reinforced Polymer fabric and steel plates. However, although base isolation reduces the tensile stress values throughout the entire mosque to levels well below the material's strength, viscous damper application in the minaret significantly reduces tensile stresses only in the minaret. As a result, viscous dampers are recommended for damage reduction in the minaret only. Otherwise, base isolation should be considered for reducing stress values throughout the entire mosque including the minaret. This study contributes towards the development of new seismic retrofitting methods for historic masonry buildings ‘minaret.
AtıfScopus26WoS26OpenAlex24İncele - MakaleYalnız künye2024Scopus SJRQ1Evaluation of the seismic performance pre- and post-restoration of a masonry clock tower's FE model updated via experimental and optimization methods
Ergün, Mustafa; Tayfur, Bilal
This article presents comprehensive numerical and partial experimental studies to determine the seismic performance of the recently restored masonry clock tower in Bayburt before and after restoration. The numerical dynamic characteristics of the structure are obtained by free vibration analysis conducted on the preliminary finite element model, while the experimental ones are determined through ambient vibration testing. The ultimate finite element models reflecting the actual state of the structure pre- and post-restoration are created through a model updating process based on the principle of minimizing the differences between numerical and experimental dynamic properties via the Tabu Search Algorithm. Dynamic analyses of the models are carried out by the mode superposition method in the time domain, using eleven earthquake ground motion records selected considering the tectonic structure of the region and scaled to the design spectrum explicitly established to the site. Seismic responses are evaluated based on displacement, maximum-minimum principal stress, and maximum-minimum principal strain. The maximum principal stress value, the most critical parameter jeopardizing the safety of masonry structures, is 2.069 MPa before the restoration reaches 2.489 MPa, with an increase of approximately 20.3 % after the restoration. Since this value is less than the tensile strength of the masonry material, 3.120 MPa, it is not at a level that poses any risk to the structure. Other structural reactions also remain below the limit values. Therefore, according to today's seismic hazard analysis criteria, it can be said that the clock tower is safe. However, the North Anatolian Fault Zone, with high tectonic activity passing just south of the city, has the potential to produce severe earthquakes that may affect the region in the future. Therefore, it is necessary to periodically monitor the seismic behaviors of the historical masonry structures in Bayburt and take essential precautions based on the results.
AtıfScopus12WoS11OpenAlex13İncele - MakaleYalnız künye2024Scopus SJRQ3Capacity-spectrum push-over analysis of rock-lining interaction model for seismic evaluation of tunnels
Majidian, Sina; Tapkın, Serkan; Tercan, Emre
Evaluation of tunnel performance in seismic-prone areas demands efficient means of estimating performance at different hazard levels. The present study introduces an innovative push-over analysis approach which employs the standard earthquake spectrum to simulate the performance of a tunnel. The numerical simulation has taken into account the lining and surrounding rock to calculate the rock-tunnel interaction subjected to a static push-over displacement regime. Elastic perfectly plastic models for the lining and hardening strain rock medium were used to portray the development of plastic hinges, nonlinear deformation, and performance of the tunnel structure. Separately using a computational algorithm, the non-linear response spectrum was approximated from the average shear strain of the rock model. A NATM tunnel in Turkey was chosen for parametric study. A seismic performance curve and two performance thresholds are introduced that are based on the proposed nonlinear seismic static loading approach and the formation of plastic hinges. The tunnel model was also subjected to a harmonic excitation with a smooth response spectrum and different amplitudes in the fully-dynamic phase to assess the accuracy of the approach. The parametric study investigated the effects of the lining stiffness and capacity and soil stiffness on the seismic performance of the tunnel.
AtıfScopus1WoS1OpenAlex1İncele - MakaleAçık Erişim2024Scopus SJRQ2Effects of Recycled Asphalt Material and Natural Pozzolan as Additives of Hot-Mix Asphalt: A Field Study
Yilmaz, Bahadır; Şentürk, Mehmet Akif
Using existing resources more efficiently and effectively becomes important currently. The question of how to make the best use of resources arises in the choice between constructing new roads and improving deteriorated existing roads. It is also important to reduce the amount of consumption and cost of materials. This has emerged the need to use waste materials by recycling and reusing. In this study, a new hot-mix asphalt (HMA) mixture was developed using recycled asphalt pavement (RAP), which was obtained by excavating the surface of a road at the end of its service life, together with a waste material namely natural pozzolan (NP). The final obtained mixture was used as a wear layer on an active highway. Core specimens were extracted from the paved layer for one year and subjected to dynamic and mechanical laboratory tests. Adding NP improved the resistance of the HMA mixture under heavy seasonal effects and traffic loads. In addition, NP increased the tensile strength, making the HMA mixture more resistant to deformation than control and RAP HMA mixtures. Dynamic creep test results showed that the control asphalt mixture had the most deformation and that the RAP mixture with NP had the least. According to the laboratory results, NP addition increased the stability value of the control mixture by 40%. Especially in cold seasons, the role of NP was more evident. In the performance tests that were applied on core samples taken from the field, ITS values for September increased by 98%, and the deformation values obtained as a result of the dynamic creep test decreased by 12%. In summary, adding NP to RAP HMA improves the performance of the pavement and the cost-effectiveness of the environmentally friendly use of RAP in HMA.
AtıfScopus1WoS1OpenAlex1İncele - MakaleYalnız künye2024Scopus SJRQ1Variations of natural frequencies of masonry minarets due to environmental effects
Yanik, Yusuf; Aymelek, Abdullah; Yildirim, Ömer; Demirtaş, Betül; Türker, Temel
It is very important to distinguish the reason of change in natural frequencies of structures either caused by a possible damage or environmental conditions (temperature and humidity). In this study, the changes in the dynamic properties of masonry and reinforced concrete minarets under environmental effects, such as temperature and humidity, were investigated. The masonry minarets of İskenderpaşa, Hacı Kasım, and Tavanlı Mosques and the reinforced concrete minarets of Karadeniz Technical University, Dilaveroğlu and Papatya Mosques in Trabzon were monitored by ambient vibration test method, and the relationship between natural frequencies and temperature and humidity was tried to be determined. For this purpose, the natural frequencies of these minarets were measured at certain intervals under different temperature and humidity conditions over a period of approximately 6 months. The vibration measurement system which was developed by our research team was used in the measurements. From the data collected by these measurements, the variation intervals of the natural frequencies (the smallest and the highest values), the percentages of change and their relations with temperature and humidity were revealed. This relationship was determined using linear–non-linear simple and multiple regression analyses. From this study, it was found that the natural frequencies change under environmental effects, such as temperature and humidity, and this rate of change was approximately 7%. There was moderate correlation in Tavanlı, Dilaveroğlu, and Papatya Minarets, and strong correlation in Hacı Kasım Minaret.
AtıfScopus16WoS17OpenAlex16İncele - MakaleAçık Erişim2023Covid-19 Pandemisinde Trabzon İli Tıbbi Atık Verilerinin Değerlendirilmesi
Fandaklı, Seda; Ates, Fatih; Atar, Büşra
Nüfusun, şehirleşmenin ve toplumsal refah düzeyinin artışı, teknolojinin gelişmesi, satın alma gücünün artışı, tüketim alışkanlıklarının değişimi, hizmetlerde lüks ve kalite arayışı atık miktarını artırmaktadır. Bu çalışmada, ayrı atık toplama ve azaltma stratejileri ile Trabzon İl Ambulans Servisi ve Toplum Sağlığı Merkezleri'nin atık yönetimini ve bu kurumlardaki atık miktarı ve dağılımına Covid-19'un etkisini incelenmiştir. Covid-19 enfeksiyonunun atık miktarına ve dağılımına etkisini incelemek için ülkemizde Covid-19 enfeksiyonunun ilk görüldüğü 2020 yılı ile önceki ve sonraki yılların verileri karşılaştırılmıştır. Trabzon İli Ambulans Servisinde, ülkemizde ilk Covid-19 vakasının görüldüğü yıl olan 2020 yılında öncesi ve sonrası yıllara göre daha fazla tıbbi atık miktarı (8641 kg) ortaya çıktığı tespit edilmiştir. Toplum Sağlığı Merkezinde ise 2020 yılında oldukça fazla artış gösteren tıbbi atık miktarı, en fazla 2021 yılında (5350 kg) olarak gerçekleşmiştir. Tıbbi atık yönetimi çeşitli riskleri de bünyesinde barındıran maliyetli bir süreçtir. Mevzuata uyumlu atık yönetimi ile riskler engellenebilir ve karşılaşılabilecek iş kazaları da minimize edilebilir. Atık yönetiminin bütün evrelerinde dikkat edilmesi gereken nokta; insan sağlığını, çevre sağlığını ve ekonomiyi olumsuz etkilemeyecek adımların atılmasıdır.
- MakaleYalnız künye2023Scopus SJRQ2An algorithmic application with flexible airspace approach
Kökhan, Ahmet; Kökhan, Serhan; Gökdalay, Meriç
Purpose: The purpose of this study is to develop an operational level decision support system model for air traffic controllers (ATCos) within the framework of the Flexible Use of Airspace (FUA) concept to enable more efficient use of airspace capacity. This study produces a systematic solution to the route selection process so that the ATCo can determine the most efficient route with an operational decision support system model using Dijkstra’s Shortest Path Algorithm. Design/methodology/approach: In this study, a new decision support system model for ATCos in decision-making positions was recommended and used. ATCos use this model as a main model for determining the shortest and safest route for aircraft as an operational-level decision support system. Dijkstra Algorithm, used in the model, is defined step by step and then explained with the pseudocode. Findings: It has been determined that when the FUA concept and DSS are used while the ATCo chooses a route, significant fuel, time and capacity savings are achieved in flight operations. Emissions resulting from the negative environmental effects of air transportation are reduced, and significant capacity increase can be achieved. The operational level decision support system developed in the study was tested with 55 scenarios on the Ankara–Izmir flight route compared to the existing fixed route. The results for the proposed most efficient route were achieved at 11.22% distance (nm), 9.36%-time (min) savings and 837.71 kg CO2 emission savings. Originality/value: As far as the literature is reviewed, most studies aimed at increasing airspace efficiency produce solutions that try to improve rather than replace the normal process. Considering the literature positioning of this study compared to other studies, the proposed model provides a new systematic solution to the problems that cause human-induced route inefficiency within the framework of the FUA concept.
AtıfScopus2WoS2OpenAlex2İncele - MakaleYalnız künye2023Scopus SJRQ3Seismic response of adjacent buildings interconnected by viscous dampers considering soil-structure interaction
Hatipoğlu, Yavuz S.; Düzgün, Oğuz A.
The effectiveness of fluid viscous dampers (FVDs) on dynamic response mitigation of coupled two adjacent structures was investigated, considering soil-structure interaction (SSI) effects under earthquake excitation. A numerical procedure was employed to evaluate system response. The finite elements were used for the numerical treatment of the adjacent buildings and soil region. Viscous boundary conditions were used as special non-reflecting boundaries on the edges of finite soil region. According to the results, the FVDs were found to be very effective for dynamic response mitigation of the adjacent buildings, even if considering the soil medium. The results showed that the most affecting parameter on the system response was found to be soil type. It was also concluded that when adjacent structures coupled by FVDs, the maximum values of the roof displacements, the base shear forces, and the base bending moments could decrease up to around 50%. Changing in lateral stiffness of the one building has minor effects on the effectiveness of viscous dampers
AtıfScopus5WoS5OpenAlex2İncele - MakaleYalnız künye2023Scopus SJRQ1Full-scale structural evaluations of İskenderpaşa minaret
Aymelek, Abdullah; Yanik, Yusuf; Demirtaş, Betül; Yildirim, Ömer; Çalik, İsmet; Türker, Temel
Nowadays, innovative methods have been used for observing and structural evaluating of historical structures. In this paper, it is presented the full-scale structural assessments of a minaret after a Finite Element model calibrating according to vibration test results. Also, the structural behaviours under earthquake and wind loads were identified by considering the environmental effects on the selected masonry minaret of İskenderpaşa Mosque. First of all, modal analysis was executed on the three-dimensional Finite Element model created according to field survey in ANSYS Workbench. In-situ vibration tests were implemented at different intervals by using developed vibration measurement system. The experimental modal parameters were attained from collected signals. The experimental results were used as reference values in model calibration of this minaret to reflect the existing structural behaviour. Model calibration process was carried out on the initial model both by changing of material properties of masonry wall and by taking into account the interactions with mosque walls and ground. Full-scale structural evaluation was carried out under earthquake and wind loads on both the initial and the calibrated models in the weak direction of this minaret. The top displacements, drift ratios, principal stress values and their distributions were determined. It was shown that the analyses on the calibrated model produce more realistic structural behaviour.
AtıfScopus21WoS20OpenAlex22İncele - MakaleAçık Erişim2023Scopus SJRQ1Optimizing the seismic resilience performance of steel truss bridges by maximum energy dissipation via friction dampers
Artar, Musa; Carbas, Serdar
The primary aim of this study is to propose an innovative design methodology for optimizing the seismic resilience performance of steel truss bridges by dissipating the maximum input seismic energy. Maximum seismic energy dissipation is carried out by means of Pall friction dampers (PFDs), popularly categorized among passive energy-damping devices. PFDs distribute input seismic energy with a slip motion along with friction during an earthquake. For that, it is important to determine the optimal slip load value for the PFDs to start working before the structural elements reach the yield point. To determine the optimal slip load values of the PFDs under earthquake effects, the maximum seismic energy distribution is assured by nature-inspired Squirrel Search (SS) and Water Strider (WS) metaheuristic algorithms for steel truss bridges equipped with PFDs. Finally, steel truss bridges on which PFDs with optimal slip load values have been implemented are optimally designed to achieve the minimal structural weight while satisfying ASD-AISC Code of Practice requirements. In order to demonstrate the validity of the proposed design methodology, two design examples of 113-member and 465-member steel truss bridges steel are presented. The optimal slip loads attained with the SS and WS algorithms by conducting the proposed design methodology are 2.45% and 3.75% of the structural weight for the first design example and 2.64% and 2.63% of the structural weight for the second design example, respectively, which are much lower than those considered in practical applications. Moreover, the numerical results show that by 93.5% and 99.48% maximum distribution rates of input seismic energy are accomplished in the bridges. The results indicate that the proposed design methodology exhibit superior performance in optimizing the seismic resilience performance of steel truss bridges by maximum energy dissipation via friction dampers.
AtıfScopus8WoS4OpenAlex5İncele
