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Öğe Assessments of Masonry Buildings and Historical Structures during the 2020 Sivrice-Elaz?? Earthquake(Budapest Univ Technology Economics, 2023) Ozmen, Alper; Maras, Muslum Murat; Ayaz, Yasar; Sayin, ErkutTurkey is located on a seismically active region. The active fault zones, primarily the North Anatolian Fault and East Anatolian Fault, constitute a center to the movements. On 24 January 2020 at local time 20:55, an earthquake of Mw = 6.8 struck Sivrice, Elazig located in eastern part of Turkey. After this main shock, 1185 aftershocks were recorded until February 8, 2020. The main event resulted in 41 human casualties and 1632 injured. Also, 45 people were salvaged from the debris. The earthquake mostly affected to Elazig and Malatya provinces. 633 buildings were demolished, 10492 buildings were severely damaged, 2161 buildings were moderately damaged, and 16046 buildings were slightly damaged in the affected region. This paper focus on evaluating the damages and failures of masonry, adobe, and historical structures in the affected areas around Elazig and Malatya provinces.Öğe Effect of slope in S-type adhesive bonding under axial loading(Springer Heidelberg, 2019) Ayaz, YasarContemporary industrial practice takes wide advantage of adhesive materials and adhesive bonding techniques, notably in the aviation and automotive industries. The geometry of bonded joints may vary considerably, and this paper explores the potential advantages of S-shaped lapped profiles with particular reference to the slope of the S. This aspect of the joint offers improvements in the area of adhering surfaces and provides superior bonding in comparison with conventional single lap joints. The study examines 30-mm overlapping specimen joints made from 100-mm-length by 25-mm-width AA 2024-T3 aluminium alloy sheets, having alternative thicknesses of 6.5, 10 and 13.5 mm. It also features three alternative radii for the profiles, thus generating different slopes for the S-shapes. The specimen joints were bonded using acrylic adhesive DP 810, modelled using finite element analysis and subjected to physical confirmation of the analysis results. The results show that a decrease in profile radius correlates with an increase in failure load; that an increase in profile radius lessens the effect of thickness on damage load and that bending moment is absent from the adhesive bonding profile of the S-shape.Öğe Mechanical behavior of butt curved adhesive joints subjected to bending(Walter De Gruyter Gmbh, 2021) Ayaz, Yasar; Citil, SerifFactors such as the surface geometry of a joint, the direction of the applied load, and the type of adhesive used have a great influence on the strength of a joint in adhesive bonding. In adhesively bonded joints (ABJ), it is possible to improve surface geometry by forming various geometric surfaces. ABJs are not very resistant to peeling stress, thus requiring that a bonding model be analyzed according to the direction of the applied load to prevent peeling stress. In this study, a butt curved joint was prepared from aluminum plates (A2024-T3) to improve the surface geometry of the joint. The mechanical behavior of the joints in three-dimensions and subjected to bending were investigated depending on an increase in the curvature radius. The adhesive DP810 was used for bonding. The finite element analysis was performed in ANSYS and cohesive zone modeling was used for a simulation of the damage growth in the adhesive layer. The results of bilinear and exponential models were found to be more appropriate to the experimental results. When the radius of curvature increases, the damage load carried decreases in the butt curved lap joints. It was seen that decreases in the curvature radius significantly decrease normal stress.Öğe Modeling of compressive strength and UPV of high-volume mineral-admixtured concrete using rule-based M5 rule and tree model M5P classifiers(Elsevier Sci Ltd, 2015) Ayaz, Yasar; Kocamaz, Adnan Fatih; Karakoc, Mehmet BurhanCompressive strength and UPV parameters are the methods that are used to determine high-volume mineral admixture concrete quality. But experiments for all levels of these parameters are expensive, difficult and time consuming. For determination of output values, classifiers with model extraction features can be used. In this study, classifiers, with the rule-based M5 rule and tree model M5P in the area of data mining are used to predict the compressive strength and UPV of concrete mixtures after 3, 7, 28 and 120 days of curing. The M5 rule and tree model M5P are tested using the available test data of 40 different concrete mix-designs gathered from literature [1]. The input of the model is a variable data set corresponding to concrete mixture proportions. The findings of this study indicated that the M5 rule and tree model M5P models are sufficient tools for estimating the compressive strength and UPV of concrete. 97% and 87% success is obtained in predicting compressive strength and UPV results, respectively. (C) 2015 Elsevier Ltd. All rights reserved.Öğe Predicting the effect of adherend dimensions on the strength of adhesively bonded joints using M5P and M5 classifiers(Springer Heidelberg, 2020) Ayaz, YasarThe configuration of adhesive bonding, especially adhesive-adherent interface, is very important in adhesive bonding. Adherend thickness, overlap length and adherend width have a great effect on failure load. It is important to know the effect of these parameters in the estimation of failure load. In this study, two models based on data mining techniques were generated for the estimation of the effect of adherend thickness, width and overlap length on failure load in adhesively bonding joints. One of the models is based on the M5P model tree and the other is based on the M5 rule algorithm. Experimental data were used to evaluate the performance of the models. The correlation coefficient parameter was used to compare the models' performance. The evaluated correlation coefficient is 93% for the M5P model tree and 96% for the M5 rule.Öğe Prediction of compressive strength and ultrasonic pulse velocity of admixtured concrete using tree model M5P(Ernst & Sohn, 2020) Kocamaz, Adnan Fatih; Ayaz, Yasar; Karakoc, Mehmet Burhan; Turkmen, Ibrahim; Demirboga, RamazanThe quality of concrete was assessed based on measurements of ultrasonic pulse velocity (UPV) and compressive strength. Portland cement (PC) was substituted with silica fume (SF), fly ash (FA) and blast furnace slag (BFS) as mineral admixtures. The compressive strength and UPV of concrete mixtures were estimated with classifiers alongside the tree model M5P in the data mining field. The compressive strength and UPV were modeled as a function of five input variables: day, cement, SF, FA, and BFS. It was found that UPV and compressive strength had an exponential correlation with SF, FA, BFS, SF + FA, SF + BFS and FA + BFS. However, additive-free admixture and PC-free substitution levels had a different constant in empirical work. According to the results obtained, both compressive strength and UPV of concrete mixtures could be reliably anticipated with the tree model M5P in a proportion of 97%. Hence, this model could be a potential new method for modeling mineral admixture concrete.Öğe Seismic Assessment of the Historical Sutlu Minaret Mosque(Budapest Univ Technology Economics, 2022) Maras, Muslum Murat; Ozmen, Alper; Sayin, Erkut; Ayaz, YasarHistorical masonry structures that connecting the past to the present have great importance because they represent the experiences and characteristics of various cultures. Therefore, the protection of historical structures is important. In this study, the structural response of the historical masonry Mosque was evaluated through dynamic analyses. For this purpose, the Sutlu Minaret Mosque which is located in Malatya, Turkey, was investigated. The three-dimensional model of the historical mosque was generated with ANSYS software. The material properties of the mosque were obtained with experimental tests. The time history analyses were used to obtain the seismic behavior of masonry mosque. In the time history analyses, six different strong ground motion records, including the 2020 Elazig earthquake, were used. After the analysis, displacement and stress values in the mosque were given. The absolute peak displacement value among these earthquake records was obtained from the 1999 Duzce earthquake and the highest principal compressive and tensile stress values were determined for the 2010 Darfield earthquake. Also, the crack regions which occurred in the mosque after the 2020 Elazig earthquake were compared with the dynamic analysis result of the 2020 Elazig earthquake. The crack regions formed after the Elazig earthquake are similar to the possible crack regions formed after the dynamic analysis.Öğe Stress analysis of adhesively bonded double strap joints with or without intermediate part subjected to tensile loading(Taylor & Francis Ltd, 2017) Citila, Serif; Ayaz, Yasar; Temiz, SemsettinAccidents in the industry, especially in the field of aerospace, are quite common. Damages like tears cracks and holes occur especially when small sand particles present in the airfield collide with the body and wings of an airplane during takeoff and landing. This torn, cracked, or pierced region should be repaired gently. Damaged parts are frequently small regions for which repair is more suitable than complete replacement as workmanship; cost and time are an important concept in today's world. A gap occurs between the patches if double-bonded patches are used in the repair of the damaged parts. In this study, the region between patches in a joint with and without intermediate parts was modeled and its effect on strength was examined numerically and experimentally. The effects of patch thickness, overlap length, adherent thickness, and gap length on the strength of the joints with and without intermediate part was compared. The results show that the intermediate part does not have any influence on the strength of the lap joint such that double strap joints without intermediate part have higher failure load. Additionally, it is seen that the failure load decreased with increasing patch thickness and increased with the thickness of the adherent.
