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Öğe A new approach in understanding the influence of irregular framing over the lateral drift in reinforced concrete structures(Gazi Univ, Fac Engineering Architecture, 2023) Karaca, Hakan; Aydin, Ersin; Severcan, Metin HakanThe approximate prediction of lateral performance of buildings without any analytical study requires quite a lot of knowledge and experience in the field for an engineer and an architect as well. An algorithm is required to enhance the mentioned predictions that mostly rely on the knowledge and experience. In this context, in order to quantify the degree of irregularity in framing of the structure in plan column density maps are developed, and thanking to the developed quantification method, the derivation of the relationship between the degree of irregularity and the maximum global roof drift of the structure is aimed. Knowing that the degree of irregularity has a negative impact on the lateral performance, in order to derive the relationship between the two, a regular structure is designed and 16 irregular models based on the regular model are developed. Linear response spectrum analysis and non-linear pushover analysis are conducted to obtain the global drifts and based shears. For linear analysis, the fundamental periods of vibration, mass participation ratio and eccentricity are monitored, while in non-linear analysis the global drifts are monitored. Shortly, the quantification of the irregularity in plan, is a novel approach which a potential to strengthen the hands of the designers, engineers and architects, also could be treated an evaluation tool as an improved global drift and lateral performance prediction method.Öğe Cam elyaf takviyeli polyester (CTP) profillerden oluşan tek eğrilikli uzay kafeskirişlerin yapay sinir ağları ile analizi(2021) , Ahmet; Severcan, Metin HakanBu çalışmada cam elyaf takviyeli polyester (CTP) malzeme kullanılarak üretilen profillerin tek eğrilikli uzay kafes sistemlerde kullanımı incelenmiştir. Farklı sistem davranışlarını görmek üzere 20 farklı sistem modeli tasarlanmıştır. Tasarlanan sistemlerde 12 farklı yükleme kullanılarak oluşturulan toplam 240 farklı model, SAP 2000 programı ile statik olarak analiz edilmiş ve AISC-ASD89’ a göre de boyutlandırılmıştır. Boyutlandırılan çubuk elemanların minimum kesit alanı değerleri, 12 farklı girdi değişkeni kullanılarak yapay sinir ağları yönteminde geliştirilen model ile tahmin edilmiş ve analiz sonuçlarına yakın değerler elde edilmiştir. Bu çözümler sonunda Cam elyaf takviyeli polyester malzemenin yapı malzemesi olarak tek eğrilikli uzay kafes sistemlerde diğer yapı malzemelerine ikame olarak kullanılabileceği gözlemlenmiştir.Öğe Deprem yer hareketi kayıtları ve yapıların tepki kayıtları arasındaki ilişkilerin yapay sinir ağları ile tayini(Niğde Üniversitesi, 1998) Severcan, Metin Hakan; Anmehmetova, ZarifeBu çalışmada deprem yer hareketi karakteristikleri ile Tek Serbestlik Dereceli sistemlerde oluşan hasar arasındaki ilişki Yapay Sinir Ağlan ile incelenmiştir. 12 farklı TSD'li sistem 75 farklı depreme maruz bırakılarak süneklilik değerleri elde edilmiştir. Deprem yer hareketlerinin maksimum ivme değerleri, maksimum hız değerleri, maksimum deplasman değerleri, ivmegram şiddetleri, kuvvetli yer hareketi süreleri, Housner spektrum şiddetleri ve Enerji yayılma indeksi ile hasar arasındaki dağılım elde edilmiştir. Daha sonra Deprem yer hareketlerinin karakteristik özelliklerinin TSD'li sistemlerde oluşan hasar üzerindeki etkinlikleri Yapay Sinir Ağlan yardımıyla bulunmuştur.Anahtar Sözcükler: Yapay Sinir Ağlan. Tek Serbestlik Dereceli Sistem. Yer Hareketi Maksimum İvmesi. Yer Hareketi Maksimum Hızı. Yer Hareketi Maksimum Deplasmanı. İvmegram Şiddeti. Housner Spektrum Şiddeti. Kuvvetli Hareket Süresi. Enerji Yayılma İndeksi.Öğe Determination of Tire Contact Stress and Deflection Distributions in a Layered Half-Space Using 3-D Boundary Element Method(2022) Deneme, İbrahim Özgür; Severcan, Metin HakanIn this study, the Boundary Element Method (BEM) was employed for the numerical determination of the response of a layered half-space. The material behaviour of the soil was assumed to be isotropic and linear elastic. The BEM was used in the Fourier transform space (FTS). The focus of this paper is to determine the stress and deflection distributions of interior points of a layered half-space. To achieve this aim, in this study, a computer program is developed for three-dimensional elastic or visco-elastic problems. The results of stress and deflection distributions in a layered half-space determined using boundary element formulation are presented in figures.Öğe Empirical Modeling of Modal Damping Ratio of Impact-Damped Flexible Beams by GEP(Springer Heidelberg, 2018) Severcan, Metin HakanIn this paper, the empirical models for predicting the modal damping ratio ( of impact-damped flexible beams (IDFB) via gene expression programming (GEP) are proposed. The experimental data used in training and testing phases of the GEP are obtained from the literature. The training and testing sets of the empirical models for the GEP are chosen from the database. The empirical models are developed for predicting the of IDFB as functions of gap between vibrating mechanical system and impact damper (c), mass of particle (m), modal amplitude at the location of the damper (, frequency of excitation (f), and peak value of the imaginary part of the frequency response functions (. The results of empirical models are compared with the results of experimental study and equation given in the literature. The results of empirical models for the are in good agreement with the experimental results according to the results of equation given in the literature. The results of empirical models also reveal that GEP technique exhibits better performance to predict the of IDFB.Öğe Investigation of material deterioration and seismic behavior of Fertek and Hançerli Churches in Cappadocia Region(2022) Severcan, Metin Hakan; Yavaşcan, Emel; Akçaözoğlu, Semiha; Akçaözoğlu, KubilayCappadocia is one of the rare natural and cultural centers on earth with its fairy chimneys, underground cities, rock churches, stone buildings and natural beauties. Among these artifacts, Fertek and Hançerli Churches that are subjected to the scope of the study are very original buildings with their superior construction techniques and rich workmanship according to the period they were built. In this study, the architectural features of Fertek and Hançerli Churches which were built in the 19th century and located within Niğde province in the Cappadocia Region were examined and material deteriorations were determined. In the light of the determinations, the existing static properties of these buildings were examined using Dynamic Finite Element Analysis program. Discoloration, vegetation, crack formation, humidification and partial mortar and stone loss were detected in both churches. When the analysis results are evaluated it has been determined that the buildings need repair and conservation depending on the region and soil class and considering the earthquake forces.Öğe Mechanical properties of SFRHSC with metakaolin and ground pumice: Experimental and predictive study(Techno-Press, 2017) Saridemir, Mustafa; Severcan, Metin Hakan; Celikten, SerhatThe mechanical properties of steel fiber reinforced high strength concrete (SFRHSC) made with binary and ternary blends of metakaolin (MK) and ground pumice ( GP) are investigated in this study. The investigated properties are ultrasonic pulse velocity (U-pv), compressive strength (f(c)), flexural strength (f(f)) and splitting tensile strength (f(st)) of SFRHSC. A total of 16 steel fiber reinforced concrete mixtures were produced by a total binder content of 500 kg/m(3) for determining the effects of MK and GP on the mechanical properties. The design fc was acquired from 70 to 100 MPa by using a low water-binder ratio of 0.2. The test results exhibit that high strength concrete can be obtained by replacing the cement with MK and GP. Besides, correlations between these results are executed for comprehending the relationship between mechanical properties of SFRHSC and the strong correlations are observed between these properties. Moreover, two models in the gene expression programming (GEP) for predicting the f(c) of SFRHSC made with binary and ternary blends of MK and GP have been developed. The results obtained from these models are compared with the experimental results. These comparisons proved that the results of equations obtained from these models seem to agree with the experimental results.Öğe MEVCUT BETONARME YAPILARIN DEPREM PERFORMANSININ ANALİZİ(2019) Severcan, Metin Hakan; Sınanı, BesianBu çalışmada, Deprem Bölgelerinde Yapılacak Binalar Hakkında Yönetmelik 2007 (DBYBHY-2007) veEurocode 8 kullanılarak mevcut yapıların performansları belirlenmiştir. Örnek olarak 8 katlı bir adet mevcutbetonarme yapı ele alınmıştır. Bu yapının performans değerlendirmesi, hem Deprem Bölgelerinde YapılacakBinalar Hakkında Yönetmelik 2007 hem de Eurocode 8’de belirtilen şartlara göre doğrusal olmayan elastikyöntemlerden biri olan statik itme analizi yöntemi kullanılarak yapılmıştır. Analiz sonucunda elde edilendeğerler doğrultusunda eleman hasar düzeyleri ve yapı performansları her iki yönetmeliğe görekarşılaştırılmıştır.Öğe Microstructural Analyses of High Strength Concretes Containing Metakaolin at High Temperatures(Springer, 2017) Saridemir, Mustafa; Severcan, Metin Hakan; Ciflikli, Murat; Celikten, SerhatIn this study, the effects of high temperatures on the mechanical and microstructural properties of high strength concretes (HSCs) containing metakaolin (MK) are investigated. For this purpose, the concrete mixtures containing MK were produced with a water-binder ratio of 0.2. The mechanical properties of these concretes at 25, 250, 500 and 750 degrees C temperatures were determined. Besides, the effect of high temperature on the microstructural properties of cementitious matrix, interfacial transition zone between cement and aggregates, and aggregates of concretes were inspected by X-ray diffraction, scanning electron microscope and plane polarized transmitted light (PPTL) analyses. The results indicate that the ultrasound pulse velocity (U-pv), compressive strength (f(c)), flexural strength (f(fs)) and splitting tensile strength (f(sts)) values of these concretes decrease with the increasing of the high temperature especially after 250 degrees C. The heated concrete specimens were also examined at both macro- and micro-scales to determine the discoloration, alteration and cracks of HSC at different temperatures. PPTL analyses show that increasing temperature causes impairing of interfaces between aggregate particles and cementitious materials. The results also show that the partial replacement of 10 % MK with cement has the best performance on the mechanical properties of HSC.Öğe Prediction of long-term effects of GGBFS on compressive strength of concrete by artificial neural networks and fuzzy logic(ELSEVIER SCI LTD, 2009) Saridemir, Mustafa; Topcu, Ilker Bekir; Oezcan, Fatih; Severcan, Metin HakanIn this study, artificial neural networks and fuzzy logic models for prediction of long-term effects of ground granulated blast furnace slag on compressive strength of concrete under wet curing conditions have been developed. For purpose of constructing these models, 44 different mixes with 284 experimental data were gathered from the literature. The data used in the artificial neural networks and fuzzy logic models are arranged in a format of five input parameters that cover the age of specimen, Portland cement, ground granulated blast furnace slag, water and aggregate, and output parameter which is 3, 7, 14, 28, 63, 90, 119, 180 and 365-day compressive strength. In the models of the training and testing results have shown that artificial neural networks and fuzzy logic systems have strong potential for prediction of long-term effects of ground granulated blast furnace slag oil compressive strength of concrete. (C) 2008 Elsevier Ltd. All rights reserved.Öğe Prediction of splitting tensile strength from the compressive strength of concrete using GEP(SPRINGER, 2012) Severcan, Metin HakanSplitting tensile strength is one of the important mechanical properties of concrete that is used in structural design. In this paper, it is aimed to propose formulation for predicting cylinder splitting tensile strength of concrete by using gene expression programming (GEP). The database used for training, testing, and validation sets of the GEP models is obtained from the literature. The GEP formulations are developed for prediction of splitting tensile strength of concrete as a function of water-binder ratio, age of specimen, and 100-mm cube compressive strength. The training and testing sets of the GEP models are randomly selected from the complete experimental data. The GEP formulations are also validated with additional experimental data except from the data used in training and testing sets of the GEP models. GEP formulations' results are compared with experimental results. Results of this study revealed that GEP formulations exhibited better performance to predict the splitting tensile strength of concrete.Öğe SİSMİK İZOLATÖRLÜ BİNALARDA KAT ADEDİ ETKİSİ(2019) Severcan, Metin Hakan; Şen, PınarBu çalışmada, sismik izolatör kullanımının bina kat adedine bağlı olarak yapısal davranışa ve maliyete olanetkisi araştırılmıştır. Kat adedinin etkisini belirlemek üzere 5, 10 ve 15 katlı binalar tek yüzeyi sürtünmeli sarkaçizolatörler yerleştirilerek modellenmiştir. Sarkaç yerleşim yerleri en alt kat kolonlarının üstü olarak seçilmiştir.Oluşturulan sismik izolatörlü bina modellerinde 24 adet 6 farklı tipte efektif rijitlik değerlerine sahip sürtünmelisarkaç kullanılmıştır. Sismik izolatörlü ve ankastre mesnetli oluşturulan 5,10 ve 15 katlı bina modelleri 1. Derecedeprem bölgesinde inşa edildikleri göz önüne alınarak bilgisayar programı ile analiz edilmiştir. Analizlersonucunda tek yüzeyi sürtünmeli sarkaç izolatörlerin kullanıldığı 5 ve 10 katlı binaların deprem esnasında çokiyi performans sergilediği ancak yüksek katlı yapılarda hem bina performansı hem de maliyet bakımından tekyüzeyi sürtünmeli sarkaç izolatörlerin kullanımının uygun olmadığı görülmüştür.Öğe The Use of Genetic Programming and Regression Analysis for Modeling the Modulus of Elasticity of NSC and HSC(SPRINGER HEIDELBERG, 2016) Saridemir, Mustafa; Severcan, Metin HakanArtificial intelligence has recently drawn the attention of explorers to predict the physical, chemical and mechanical properties of normal-strength concrete (NSC) and high-strength concrete (HSC). This study presents gene expression programming (GEP) and regression analysis (RA) for modeling the modulus of elasticity (E-c) from the compressive strength (f(c)) values of NSC and HSC. In order to create the models, experimental results of NSC and HSC are collected from the published literature. The evaluated results by training, testing and checking of the GEP and RA models are compared with the results obtained from the experimental studies, the formulations presented by some national building codes and the formulations proposed by some authors available in the literature. These comparisons and statistic results show that GEP and RA models are very effective methods for calculating the E-c from f(c) of NSC and HSC.
