İnşaat MühendisliğiConstruction Engineeringhttps://hdl.handle.net/20.500.12508/382024-03-29T13:57:07Z2024-03-29T13:57:07ZNehirlerdeki Katı Madde Miktarının Bulanık Smgrt Yöntemiile TahminiDayan, FeyzullahDemirci, MustafaÜneş, FatihTaşar, Bestamihttps://hdl.handle.net/20.500.12508/30412024-01-18T13:37:14Z2021-01-01T00:00:00ZNehirlerdeki Katı Madde Miktarının Bulanık Smgrt Yöntemiile Tahmini
Dayan, Feyzullah; Demirci, Mustafa; Üneş, Fatih; Taşar, Bestami
Nehirlerdeki katı madde miktarının doğru tahmin edilmesi; kirliliğin belirlenmesi, akarsu taşımacılığı, barajömrünün tespiti vb. konularda oldukça önemlidir. Bu çalışmada, Çoklu Doğrusal Regresyon (ÇDR) BulanıkMantık- Simple Membership Functions and Fuzzy Rules Generation Technique (Bulanık SMRGT) yöntemleri kullanılarak nehirlerdeki katı madde tahmini yapılmıştır. Katı madde tahmini için Catonsville yakınında PatapscoNehri üzerinde bulunan katı madde (sediment) gözlem istasyonuna ait 2015-2018 yılları arasında bulunan akımverileri, girdi parametresi olarak kullanılarak modeller geliştirilmiştir. Model sonuçları birbirleriylekarşılaştırıldığında Bulanık Mantık modellerinin gözlem sonuçları ile uyumlu sonuçlar verdiği görülmüştür.; Determination of pollution, river transport, determination of dam life, etc. matters are very important in theaccurate estimation of the amount of sediment in rivers. In this study, sediment estimation in river was made usingMultiple Linear Regression (MLR) Fuzzy Logic-Simple Membership Functions and Fuzzy Rules GenerationTechnique (Fuzzy SMRGT) methods. For the sediment estimation, the models were developed by using the flowdata of the sediment observation station located on the Patapsco River near Catonsville between the years 2015- 2018 as input parameters. The model results were compared with each other and it was seen that the FuzzySMRGT model gave consistent results with the observation results.
2021-01-01T00:00:00ZTectonic implications of the February 2023 Earthquakes (Mw7.7, 7.6 and 6.3) in south-eastern TürkiyeÖver, SemirDemirci, AlperÖzden, Sühahttps://hdl.handle.net/20.500.12508/30122024-01-16T07:57:04Z2023-01-01T00:00:00ZTectonic implications of the February 2023 Earthquakes (Mw7.7, 7.6 and 6.3) in south-eastern Türkiye
Över, Semir; Demirci, Alper; Özden, Süha
The series of earthquakes that took place on February 6, 2023 caused one of the saddest major calamities in Turkiye. The first major earthquake of magnitude Mw7.7 broke the Pazarcik and Erkenek segments moving north on the East Anatolian Fault Zone (EAFZ) between Turkoglu and celikhan. According to the Coulomb failure criterion, the Pazarcik earthquake (Mw7.7) increased stress on the Surgu-cardak Fault, a segment on the north splay of the EAFZ, and nine hours later the Elbistan earthquake (Mw7.6) occurred. This great event ruptured the cardak Fault, the western part of the E-W trending Surgu-cardak Fault between Nurhak and Goksun. The Amanos Fault, which extends from Turkoglu south to Antakya, broke almost simultaneously to the first Pazarcik earthquake. Similarly, the earthquake that broke the Amanos Fault transferred increased stress to its southwestern neighbour, the Cyprus-Antakya Transform Fault, triggering the 6.3 magnitude Samandag earthquake 14 days later. The February 2023 earthquakes, which caused the collapse of >100,000 buildings and the death of >50,000 people, created surface ruptures hundreds of kilometres in length and caused different displacements on different faults, the two largest of which were 4.6 and 6.7 m. On all the faults where the deadly earthquakes occurred in February 2023, inversion of the focal mechanisms of the earthquakes (main shocks and their aftershocks) indicates a transtensional stress regime, or a change from strike-slip to normal slip. For all strike-slip inversions, the R values are <0.45 indicating transtension. The stress tensors obtained indicate left-lateral movement with normal component on all faults where the earthquakes occurred. The transtensional regime, which is thought to reflect regional tectonics, is the result of forces caused by relative movements of Arabia, eastern Mediterranean and Eurasia.
2023-01-01T00:00:00ZYeşil Mutabakatı Destekleyen Mineral Katkılı Çimento Esaslı Kompozitlerin Asit-Sülfat Direnci ve Karbonatlaşma DerinliğiBalçıkanlı Bankir, Müzeyyenhttps://hdl.handle.net/20.500.12508/30012024-01-15T10:25:41Z2022-01-01T00:00:00ZYeşil Mutabakatı Destekleyen Mineral Katkılı Çimento Esaslı Kompozitlerin Asit-Sülfat Direnci ve Karbonatlaşma Derinliği
Balçıkanlı Bankir, Müzeyyen
Çalışma kapsamında sürdürülebilir ve yeşil mutabakatı destekleyen çimento esaslı kompozitlerin mekanik ve durabilite performanslarını değerlendirmek için Granüle Yüksek Fırın Cürufu (GYFC), Uçucu Kül (UK) ve Silis Dumanı (SD)’nın tekli, ikili ve üçlü kompozisyonlarının çimento ile ağırlıkça %15, %30 ve %45 oranında ikame edilmesi ile sekiz farklı beton üretilmiştir. Numunelerin 28 ve 90 günlük dört noktadan eğilme dayanımı ve basınç dayanımının yanı sıra 30 gün boyunca %5 konsantrasyonda hazırlanan sülfürik asit ve sodyum sülfat içeren ortamlara maruz kalan betonların performans değerlendirilmesi ağırlık ve dayanım değişimleri dikkate alınarak yapılmıştır. Çimento miktarının %30 azaltılması ile üretilen kompozit numuneler kontrol numunesine göre daha üstün mekanik ve durabilite özelliği sergilemiştir. Laboratuvar ortamında bekletilen numunelerin 60 ve 120 günlük karbonatlaşma derinlikleri (KD) de ölçülmüş ve KD’yi sınırlayan en ideal kompozisyon %15 GYFC+ %15 UK’dir.; Within the scope of the study, in order to evaluate the mechanical and durability performances of cement-based composites that support sustainable production and green deal, single, double and triple compositions of Granulated Blast Furnace Slag (GYFC), Fly Ash (UK) and Silica Fume (SD) were replaced with cement 15%, 30% and 45% by weight and so eight different concretes were produced. In addition to the four point flexural and compressive strength of the samples at 28 and 90 days, the concretes were exposed to sulfuric acid and sodium sulfate solutions prepared at 5% concentration for 30 days. Performance evaluation was made by considering weight and strength changes. Concrete samples produced by reducing the amount of cement by 30% showed superior mechanical and durability properties compared to the control sample. Carbonation depths (KD) of 60 and 120 days samples, kept in the laboratory, were measured and the ideal composition limiting the KD was 15% GYFC + 15% UK.
2022-01-01T00:00:00ZDynamic response of laminated functionally graded carbon nanotube-reinforced composite viscoelastic platesDoğan, Alihttps://hdl.handle.net/20.500.12508/29882024-01-12T12:59:13Z2023-01-01T00:00:00ZDynamic response of laminated functionally graded carbon nanotube-reinforced composite viscoelastic plates
Doğan, Ali
The dynamic response of viscoelastic plates reinforced with functionally graded carbon nanotube-reinforced composite material (FG-CNTRC) under dynamic loads was examined in this work. This research investigates the dynamic analysis of CNTRC plates by single-walled CNTs (SWCNTs). SWCNTs were considered to be straight and aligned, with a homogeneous pattern. Carbon nanotube (CNT) configurations were investigated, inclusive of uniform, and three varieties of FG distributions of CNTs across the thickness. The equation of motion of composite plates was obtained using Hamilton’s principle. The time-dependent equations were derived by applying the Navier solution method to the equation of motion. These equations were converted into the Laplace domain. The Modified Durbin procedure was used to convert the resultant computations from the Laplace field to the time field. The resulting findings were compared to other methods. It was demonstrated that the findings are consistent with those of other methods. Then, sensitivity analysis revealed that CNT volume fractions, damping ratios, and FG distributions had a substantial influence on the quasi-static and dynamic behavior of viscoelastic FG-CNTRC plates. Results show that with the help of the Laplace technique no need to use free vibration frequencies or modes, it is possible to solve the problem quite precisely, effectively, and easily.
2023-01-01T00:00:00Z