Profile URL: https://hdl.handle.net/20.500.13091/11739
Job Title:Doç. Dr.
Email Address:mkocer@ktun.edu.tr
Main Affiliation:02.02. Department of Civil Engineering
Status: Current Staff
ORCID:
0000-0002-5505-2065
0000-0002-5505-2065Scopus ID:
57301576300
57301576300YÖK Akademik: 3DB62C0D746B4D09
Google Scholar:
8hDOYvEAAAAJ
8hDOYvEAAAAJWeb of Science ID:
ABB-2636-2020
ABB-2636-2020Name Variants:
Kocer, Mustafa
21 results
Scholarly Output Search Results
Now showing 1 - 10 of 21
Article Citation - WoS: 19Citation - Scopus: 20Investigation of Reinforcement Corrosion Effects in Rc Columns Produced With Blast Furnace Slag and Fly Ash Under Reversed-Cyclic Lateral Loading Tests(ELSEVIER SCI LTD, 2021-10-01) Koçer, Mustafa; Boğa, Ahmet Raif; Öztürk, MuratCorrosion, which threatens reinforced concrete structures throughout their service life, adversely affects the earthquake performance of the structures. For countries located in an active earthquake zone, it is of great importance to investigate the behavior of reinforced concrete structures exposed to corrosion damage under lateral load. For this purpose, the effect of the use of blast furnace slag (BFS) and fly ash (FA) in certain proportions by weight of CEM I 42.5R cement on the reinforcement corrosion inside the RC column and the positive/ negative contribution to the behavior of the columns under lateral load were experimentally investigated. Within the scope of this study, firstly three RC column specimens without any mineral admixture were produced as CONTROL series. In the mineral admixture series, a total of 12 RC column specimens, 3 from each series, were produced by using 20% and 40% BFS, 10% and 20% FA of the cement amount instead of cement, respectively. One of the three columns produced for each series was selected as a reference, and the remaining two-column specimens were exposed to corrosion under constant voltage until theoretically 10% and 30% weight losses were achieved, respectively, using the Faraday Equation in the reinforcements. After the accelerated corrosion tests, the RC columns were tested under reversed-cyclic lateral loading reflecting the earthquake effect. Experimental results show that the use of mineral admixtures in concrete production reduces the risk of corrosion of reinforced concrete elements and improves earthquake behavior.Article Citation - WoS: 24Citation - Scopus: 27Determination of Moment, Shear and Ductility Capacities of Spiral Columns Using an Artificial Neural Network(ELSEVIER, 2019-11-01) Koçer, Mustafa; Öztürk, Murat; Arslan, M. HakanIntelligent systems are frequently used to solve difficult and complex problems in today's world. Especially in the discipline of civil engineering, much research has been conducted with the help of intelligent systems. The objective of this study is to identify the moment and shear force capacities of reinforced concrete spiral columns and their displacement ductility values by using an algorithm based on an Artificial Neural Network (ANN). In the study, 86 different spiral column experiments tested in the literature were compiled, and the moment and shear force capacities obtained through the experiments were arranged at a certain level. In addition, the ductility values of the tested columns were calculated using graphical experimental data. The output layer consists of four neural network models, which are ANN(1) (with three output neurons), ANN(2), ANN(3), and ANN(4) (with one output neuron), and moment, shear force capacity, and displacement ductility parameters were obtained, respectively. According to results of this study, it was observed that moment and shear force capacities of spiral columns could be particularly well estimated using ANN. However, it was found that the estimation success of ANN for displacement ductility was not sufficient.Article Citation - WoS: 18Citation - Scopus: 21Multifunctional Behavior of Composite Beams Incorporating Hybridized Carbon-Based Materials Under Cyclic Loadings(ELSEVIER SCI LTD, 2022-01-01) Öztürk, Oğuzhan; Koçer, Mustafa; Ünal, AlptuğThe investigation was performed on the cyclic self-sensing behavior of reinforced composite beams produced with carbon fiber (CF) and carbon black (CB) in a hybridized form. Prior to the investigation, CFs and CBs were individually used in small-scale specimens at different ratios. The electrical properties were tailored by binary using of CFs and CBs for the improved self-sensing functionality. After evaluation of electrical and mechanical properties, self-sensing reinforced composite beams were produced with a span/effective depth ratio of 2.2. Repetitive loading and unloading cycles within elastic and plastic range were separately evaluated and applied for the developed composite beams. Beams were tested up to 30% and 70% of their ultimate flexural strength for the cyclic loadings within elastic and plastic range, respectively. Engineering properties and self-sensing assessments were simultaneously performed. Experimental findings revealed that developed composite beams provided a reversible piezoresistive behavior under plastic regime although it was partially possible under the elastic regime. Only beams coupled with hybrid carbon-based materials were able to repetitively self-sense damages between %30 and %70 of the total applied load. Carbon-based materials made a slight contribution to the engineering properties of beams as also validated by finite element analysis.Conference Object Vertical Equivalent Earthquake Load and Time History Earthquake Analysis on a Sample Building(2022) Akay, Büşra Selvi; Ünal, Alptuğ; Koçer, MustafaSpectral acceleration values that will affect the structure during an earthquake are obtained from the design acceleration spectra in the regulations, and the earthquake loads that will affect the structure are determined by the dynamic and static methods in the regulations. Although dynamic methods are more realistic and more difficult to understand, they are applied on all existing buildings if a sufficient number of natural vibration modes and their contributions reach the limit values specified in the regulations. Static methods, on the other hand, are obtained by calculating the spectral acceleration value determined depending on the dynamic feature of the structure, depending on the mass of the structure, and distributing it as a static load, taking into account the first mode of the structure. Compared to dynamic methods, there are limitations of usage areas and building height classes. In the regulations, in order to make the design earthquake calculation simpler, they suggest static methods as the design spectrum and liken it to the dynamic method. The main purpose of this study is to compare the vertical earthquake analysis required according to the structural defects defined in TEC 2018 according to the code design spectrum and linear time history analysis. According to TEC 2018, static and dynamic earthquake load analyzes were carried out on buildings with different overhang rates. It has been observed that the structural results according to the dynamic lateral load analysis are quite low compared to the assumptions in the static method. The regulation remains on the safe side in calculating the vertical earthquake force with the static earthquake load analysis.Conference Object Examination of the Vertical Earthquake Force on a Sample Building With Different Outputs According To Tec2018(2022) Akay, Büşra Selvi; Ünal, Alptuğ; Koçer, MustafaThe concept of vertical spectrum started to be implemented in Turkey with the Turkish Building Earthquake Code 2018 (TEC 2018) regulation. Before this regulation, earthquake analysis was carried out under horizontal loads with only the horizontal spectrum in buildings and it was predicted to stay on the safe side with the axial load limitation made on the columns. In TEC 2018, vertical earthquake analysis is performed depending on the structural defects in the structures. In this study, vertical earthquake analyzes were carried out on building samples with different ratios of cantilever overhangs. During these analyses, the vertical earthquake acceleration assumption made in the earthquake code and the analysis results obtained from the vertical earthquake spectrum were examined. For this purpose, firstly, horizontal earthquake forces under equivalent earthquake force, axial load levels on the columns and sectional effects and displacements on the cantilever supports were obtained on the structures. These results were compared with the data obtained from the vertical spectrum analysis with the response spektrum method, which is the dynamic analysis. The results obtained show that the assumptions made in the equivalent earthquake load method are on the safe side.Conference Object Piezo-Resistivity of Cement-Based Mortars Doped With Carbon Black and Carbon Fibers for Self-Sensing Behavior(2021) Öztürk, Oğuzhan; Ünal, Alptuğ; Koçer, MustafaThe efficient use of carbon-based materials is of a challenge for the advanced self-sensing behavior of cement-based mortars. This study deals with the dispersion of the carbon-based materials and investigating the self-sensing response by using conductive fillers. To do this, carbon black (CB) and carbon fibers (CF) were used cement mortars to evaluate the piezo-resistivity response. Dispersion of the conductive fillers was achieved by using sodium hydroxide as surfactant. Reference specimens were produced and comparison was made with the specimens doped with CB and CF. Experimental work reveals that CB and CF enabled superior relative change in electrical resistivity of composites. However, CF was more promising than CB in terms of achieving higher piezo-resistivity. In addition to non-structural functionalities, mechanical properties of developed mixtures were also evaluated. The use of CF provided higher flexural strength compared to reference and CB-bearing specimens. On the other hand, carbon-based materials made a negligible contribution to the compressive strength of the cement-based mortars.Master Thesis Geniş Açıklığa Sahip Çelik Makasların Dıştan Ard Germe Halatlar ile Kapasitelerinin Arttırılması(2024) Şen, Hüseyin; Koçer, MustafaÜlkemizde çelik konstrüksiyon yapı uygulamaları yaygındır. Çelik malzemenin yüksek dayanıma sahip olması, elastik tasarım imkânına sahip olması, hafif olması, depreme dayanıklı olması, uzun ömürlü ve sürdürülebilir olması, ön üretimli olması, hassas üretim olanakları sağlaması ve daha hızlı inşa edilmesi gibi sebeplerle özellikle sanayi yapılarında tercih sebebi olmaktadır. Günümüzde depremin yapıya olan etkileri göz önünde bulundurulduğunda, özellikle deprem bölgelerinde farklı yapı tipleri için de çelik konstrüksiyon kullanım alanı gün geçtikçe artmaktadır. Çevre bilincinin artmasıyla birlikte sürdürülebilir malzemelere verilen önem de artmaktadır. Ekonomik olanakların da gün geçtikçe arttığı göz önünde bulundurulduğunda, çelik konstrüksiyon yapıların inşasının ilerleyen dönemlerde artarak devam edeceği öngörülmektedir. Bu sebeple çelik konstrüksiyon için yapılan çalışmalar da artmaktadır. Bu çalışmalarda, klasik tasarımdan farklı olarak alternatif tasarım yöntemleri belirlenmeye çalışıldığı gibi mevcut yapıların, zaman şartlarına göre inşa edildiği göz önünde bulundurularak günümüz yönetmelik normlarına göre performansları da incelenmektedir. Yönetmeliklerin gün geçtikçe değiştiği göz önünde bulundurulduğunda mevcut yapıların bir kısmının günümüz yönetmelik şartlarına cevap veremeyecek durumda oldukları görülmektedir. Can ve mal güvenliğini sağlamak için bu yapıların yeniden inşa edilmesi veya uygun şekilde güçlendirilmesi gerekmektedir. Bu kapsamda ard germe halatları ile güçlendirilen çelik makasların yatay ve düşey yüklemeler altında çelik yapı üzerine etkisini belirlemek için parametrik bir çalışma yapılmıştır. Bu çalışmada ilk olarak ard germe halat tasarım tipi belirlenmeye çalışılmış ve daha sonra optimum ard germe halat yükü göz önünde bulundurularak önerilen güçlendirme halat tipinin yüklemeler altındaki davranışı incelenmiştir. Bu çalışmanın sonucunda ard germe halat etkisinin kesit tesirleri ve çelik konstrüksiyon tasarımı üzerinde ne gibi etkisi bulunduğu tespit edilmeye çalışılmıştır. Ayrıca mevcut yapıların güçlendirilmesi için de bir yöntem olarak kullanılıp kullanılamayacağı tartışılmıştır.Article İnşaat Mühendisliği Deneysel ve Analitik Tasarımlarında Taguchi Yönteminin Kullanılabilirliğinin Araştırılması(2023-03-05) Uray, Kemal; Koçer, Mustafa; Uray, Esra; Açıkel, HicranYapıların tasarımı, inşası, işletilmesi ve bakımı gibi konularda çalışmalar yapan bir mühendislik dalı olan inşaat mühendisliğinde deneysel çalışmalar, yapı malzemelerinin ve taşıyıcı sistemlerinin yük-deformasyon davranışının gözlemlenmesi ve yapılan imalatların kontrol edilmesi gibi birçok problemde vazgeçilmez çözümler üretmektedir. İnşaat mühendisliği alanında özellikle beton üretiminde ve zemin iyileştirme çalışmalarında yoğun olarak kullanılan çimentonun üretiminde önemli ölçüde CO2 gazı salmaktadır. Bu malzemenin optimum miktarının belirlenerek daha az kullanılması, sürdürülebilir ve çevre dostu olması açısından çözülmesi gereken önemli bir problem olarak karşımıza çıkmaktadır. Uçucu kül, silis dumanı ve öğütülmüş yüksek fırın cürufu gibi atık malzemelerin ikamesiyle çimento miktarı azaltılabilmekle birlikte bu atık malzemelerin optimum değerleri önemli olmaktadır. Öte yandan istatistiksel tabanlı deneysel tasarım yöntemleri, deneysel çalışmaların optimum değerinin tasarımdan etkilenen parametreler dikkate alınarak araştırılmasını gerektirdiği için yaygın olarak kullanılmaktadır. İstatistik tabanlı deney tasarım yöntemlerin kullanılması ile basınç dayanımı, geçirgenlik gibi hedef değeri etkileyen faktörlerin yorumlanması ve bu faktörlerin optimum değerlerinin elde edilmesi mümkün olmaktadır. Genichi Taguchi tarafından geliştirilen yöntem sayesinde zamandan, iş gücünden, maliyetten ve enerjiden tasarruf sağlanarak güvenilir sonuçlar elde edilmekle birlikte sonuç üzerinde etkili parametrelerin etkisi ve optimum değerleri güvenilir bir şekilde elde edilebilmektedir. Bu çalışmada inşaat mühendisliğinin deneysel çalışmalarının yoğun olarak bulunduğu yapı malzemesi ve geoteknik alanında Taguchi yönteminin kullanım alanlarına dair geniş kapsamlı literatür incelemesi verilmiş ve özellikle son yıllarda yöntemin yaygın bir şekilde istatistik deney tasarım yöntemi olarak kullanıldığı görülmüştür.Conference Object Comparison of Tec 2018 and Tec 2007 According To İzmir Earthquake Acceleration Record(2021) Koçer, Mustafa; Öztürk, Oğuzhan; Ünal, AlptuğSignificant changes were made with Turkey Earthquake Building Regulations published in 2018. However, when the building stock in our country is examined, it is seen that most of the buildings are built according to the old regulations. Similarly, there are buildings designed in accordance with old and new regulations in İzmir province. In this study, a building was modelled and analyzed with time-domain based on the acceleration records of İzmir Earthquake (31.10.2020) according to both Turkey Building Earthquake Regulations in 2007 and 2018. Analyzes were made with a nonlinear structural analysis programand the differences between the two earthquake regulations were evaluated in terms of Izmir earthquake. In the TEC 2007 regulation, since the design spectral acceleration values in the tail part of the spectrum curve after TB are higher than the TEC 2018 regulation, similar results were obtained in the base shear force value.Article Analytical Study on the Effect of Corrosion To the Construction Performance(2019) Koçer, Mustafa; Öztürk, Murat; Boğa, Ahmet RaifCorrosion is one of the most important factor to achieve in completing the service life of reinforced concrete structures also cause significant losses in energy damping capacities of structures. In this study, the reinforced concrete column designed in ½ geometrical scale was subjected to accelerated corrosion test for 26.5 days under 1 ampere constant current. As a result of the experiment, weight loss and strength reductions was obtained. Loss of strength in reinforcement due to corrosion damage was obtained with experimental procedure. Loss of cross section and reduction of compressive strength of concrete were obtained with empirical formulas in the literature. Thanks to this data, 3 different scenarios applied on a sample building in Hatay province. Static pushover analyzes of the sample building designed in accordance with the regulations were carried out with Sap 2000 program under the specified corrosion scenarios. The load-displacement curves obtained by the scenarios are compared with the curves of the reference building. As a result of the comparisons, it was observed that corrosion damage caused significant loss in horizontal load carrying capacity of the building. The corrosion scenarios show that corrosion in columns or beams changes collapse modes of the structure.
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Research Topics
Domains
Physical Sciences
Fields
ChemistryEngineeringMaterials Science
Subfields
SpectroscopyInorganic ChemistryCivil and Structural EngineeringMaterials ChemistryBuilding and Construction
Specific Research Areas
Molecular Sensors and Ion Detection
Metal-Organic Frameworks: Synthesis and Applications
Structural Health Monitoring Techniques
Advanced Nanomaterials in Catalysis
Seismic Performance and Analysis
Structural Behavior of Reinforced Concrete
Concrete Corrosion and Durability
Sustainable Development Goals
11SUSTAINABLE CITIES AND COMMUNITIES
5
Research Products
7AFFORDABLE AND CLEAN ENERGY
1
Research Products
9INDUSTRY, INNOVATION AND INFRASTRUCTURE
1
Research Products
17PARTNERSHIPS FOR THE GOALS
1
Research Products
12RESPONSIBLE CONSUMPTION AND PRODUCTION
1
Research Products
Documents
12
Citations
160
h-index
8
Documents
4
Citations
65
Publication Collaboration
| Affiliation Name | Count |
|---|---|
| Konya Technical University | 13 |
| Selçuk University | 12 |
| Afyon Kocatepe University | 4 |
| Ankara University | 2 |
| Necmettin Erbakan University | 2 |
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Data obtained from OpenAlex
| Journal | Count |
|---|---|
| ENGINEERING STRUCTURES | 2 |
| Applied Sciences-Basel | 1 |
| Journal of Building Engineering | 1 |
| JOURNAL OF BUILDING ENGINEERING | 1 |
| Konya Mühendislik Bilimleri Dergisi | 1 |
Current Page: 1 / 3
Scholarly Output
21
Articles
12
Views / Downloads
45/120
Supervised MSc Theses
2
Supervised PhD Theses
1
WoS Citation Count
61
Scopus Citation Count
68
Patents
0
Projects
0
WoS Citations per Publication
2.90
Scopus Citations per Publication
3.24
Open Access Source
13
Supervised Theses
3
Scopus Quartile Distribution
Competency Cloud
