Browsing by Author "Doğan, Talha Polat"

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Betonarme Binalarda Dayanım Fazlalığı Katsayısı Üzerine Bir İrdeleme
(Konya Teknik Üniversitesi, 2019) Doğan, Talha Polat; Erkan, İbrahim Hakkı
Yapıların analiz ve tasarım hususları üzerinde yeni bir düzenleme getiren ve 1 Ocak 2019 tarihinde yürürlüğe giren TBDY 2018 'de belirtilen koşullara uygun olarak dayanım fazlalığı katsayısı üzerine bir irdeleme yapılmıştır. Bu doğrultuda literatür incelemesi yapılmış ve TBDY 2018 'de belirtilen tasarım esaslarına bağlı kalarak 18 tip yapı modeli hazırlanmıştır. Bu modeller 4 kat, 7 kat ve 10 katlı olmak üzere 3 farklı bina yüksekliğinde tasarlanmıştır. Her bina yüksekliği için referans model teşkil etmesi için çerçeveli taşıyıcı sisteme sahip birer model, TBDY 2018 'in 7.6.1.3 Maddesi 'nde belirtilen tanıma uygun olacak şekilde taşıyıcı sistemlerinde ‰ 0.5, ‰ 1, ‰ 1.4, ‰ 1.7 ve ‰ 2 oranlarında betonarme perde eleman bulunduran 6 model tanımlanmıştır. Hazırlanan bu 18 tip yapı model, TDY 2007 üzerine yürürlüğe giren TBDY 2018 ile gelen değişimlerin de incelenmesi adına doğrusal analizler için her iki yönetmeliğe uygun olarak Eşdeğer Deprem Yükü Yöntemi ve Mod Birleştirme Yöntemi ile 36 adet doğrusal analize tabi tutulmuştur. Bu analizler sonucu iki çözüm yöntemi için de TBDY 2018 'deki koşullar ile yapıların periyotlarının arttığı, taban kesme kuvvetlerinin azaldığı, yani kısaca yapıların daha sünek davranış sergilediği görülmüştür. Bu tezin genel amacı olan dayanım fazlalığı değerlerini belirlemek için TBDY 2018 'e göre Mod Birleştirme Yöntemi ile elde edilen sonuçlar kullanılmıştır. Dayanım fazlalığı katsayılarının belirlenmesi adına yapılan doğrusal ötesi analizlerde yığılı plastik davranış kabulü ile statik itme analizi tercih edilmiştir. Plastik mafsal boyu değişiminin dayanım fazlalığı katsayısı üzerindeki etkisinin incelenmesi için her model için 6 farklı Lp kullanılmıştır. Bu bölüm için toplamda 108 adet doğrusal ötesi analiz yapılmıştır.Analizler sonucu mafsal boyundaki değişimin push-over eğrisindeki akma sınırına kadar olan bölgede bir farklılık göstermediği, gözlemlenmiştir. Rijit diyafram kabul durumunun dayanım fazlalığı katsayısı üzerinde etkisini incelemek adına seçilen 6 tip model 3 farklı plastik mafsal boyu ile analiz edilmiştir. Hazırlanan 18 tip yapı modeli için toplamda 162 adet analiz yapılmıştır. Elde edilen dayanım fazlalığı katsayıları TDY 2018 'de belirtilen değerlerin altında kalmış olmasına rağmen tamamı 1 'den büyüktür. Bu da yapıların yeterli dayanımı sağladığı anlamına gelmektedir. Bu durumda konut türünde inşa edilecek binalar için ‰ 1 oranında betonarme perde içeren taşıyıcı sistem tasarımı, özenli yapılması halinde optimum çözüm olacağı sonucuna varılmıştır. Bina önemi artması ya da kat ötelenmelerinin önlenmesi durumlarında daha fazla perde oranı kullanılması önerilir.
Citation - WoS: 19
Citation - Scopus: 25
A Comparative Study on the Rapid Seismic Evaluation Methods of Reinforced Concrete Buildings
(ELSEVIER, 2021) Doğan, Talha Polat; Kızılkula, T.; Mohammadi, M.; Erkan, I. H.; Kabaş, H. Tekeli; Arslan, M. H.
In this study, firstly, visual screening based (VSB) (FEMA 154, RVS and RBTE) and capacity-based (P25, Yakut, AURAP and DURTES) methods which are rapid seismic safety assessment methods of existing buildings have discussed. In addition, the linear and nonlinear earthquake performance procedures of the reinforced concrete structures according to the TBEC-2018 which does not have a rapid evaluation method but includes a detailed performance analysis procedure code were also given. After that, 30 existing reinforced concrete buildings collected from Istanbul-Turkey have been analyzed to all these mentioned methods. In this study results of all 7 different rapid seismic assessment methods were compared with results of TBEC-2018?s linear and nonlinear performance with regard to advantages and disadvantages. Finally, it was seen that while FEMA 154, RVS and RBTE methods are faster to apply on the buildings however P25, Yakut, AURAP and DURTES methods take more time to apply and give more conservative results. It was observed that the results obtained from the non-linear evaluation method of TBEC-2018 are less conservative than other methods. In addition, different results obtained from linear and nonlinear evaluation methods given in TBEC-2018 for the same buildings were also drawn attention.
Comparison of Equivalent Seismic Load and Response Spectrum Methods According To Tsc 2018 and Tsc 2007
(2019) Erkan, İbrahim Hakkı; Doğan, Talha Polat
In this study, two different analysis methods were compared; the first is a linear static analysis method and the second is a linear dynamic analysis method. First one is the Equivalent Seismic Load Method, which is a linear static method where seismic loads can be obtained by applying a simple calculation. The second method, the Response Spectrum method, is a linear dynamic analysis method which obtains the seismic loads using more complex statistical calculations. For this analysis study, 18 structural models with 3 different building heights were analyzed according to the conditions of Equivalent Seismic Load Method and Response Spectrum Method specified in both TSC 2007 and TSC 2018 and base shear forces obtained as a result of these analyzes were compared. As a result of analysis; compared to the results obtained from TSC 2007, due to the effective stiffness coefficients specified in TSC 2018, it was observed that the base shear forces obtained for both methods were lower and the modal period values were longer in the analyzes applied according to TSC 2018. This means that the structural systems created with the designs according to TSC 2018 are more ductile than the structural systems created with the designs made according to TSC 2007. Base shear forces obtained by 2 different analysis methods applied according to regulations stated in both TSC 2018 and TSC 2007; it was observed that the base shear forces obtained by the Equivalent Seismic Load Method were higher than the results of the Response Spectrum Method.
Citation - WoS: 4
Citation - Scopus: 4
Evaluation of the Nonlinear Seismic Responses of High-Rise Reinforced Concrete Buildings With Different Foundations and Structural Plans-Considering Soil-Structure Interactions
(MDPI, 2024) Doğan, Talha Polat; Erkan, İbrahim Hakkı
Regarding the behavior of reinforced concrete structures under seismic loads, the interaction between structure and soil is as important as the load-bearing system and foundation type. This study was designed to assess the effect of structural types and soil-structure interactions (SSIs) on the responses of reinforced concrete (RC) buildings to earthquakes. Therefore, nonlinear time history analyses were performed on 20-storey RC buildings. In this analysis, three different structural system types and three different foundation types were considered for the parametric study. The numerical results obtained from the nonlinear dynamic analysis were criticized in terms of base shear force and roof displacement. Based on the obtained numerical results, utilizing SSI in the nonlinear time history analysis of the RC buildings improved the overall structural integrity by delaying plastic hinge formation and preventing the total failure of structural elements. Base shear forces increased up to 20% for the same structural system and different SSI situations, and up to 60% for different structural systems and the same SSI situation. Roof displacements increased up to 17% for the same structural system and different SSI situations, and up to 24% for different structural systems and the same SSI situation. All of the behavioral differences showed the importance of considering the SSI in the design stage of the buildings.
An Investigation on Determining Optimum Wall Ratio–cost Relationship of Shear Walled Reinforced Concrete Buildings
(2020) Erkan, İbrahim Hakkı; Doğan, Talha Polat; Arslan, Musa Hakan
Reinforced concrete walls are very efficient structural elements in terms of carrying the lateral loads that are expected to affect the structures during the service of the buildings. These elements, which are not used for economic reasons in buildings designed in areas with low seismic hazard, can actually provide a significant increase in performance with a very small increase in construction cost. In this study, a total of 9 building models have been created and the relationship between optimum reinforced concrete wall ratio and cost on these buildings has been investigated. The design and analysis of the models were carried out according to the criteria specified in TSC 2018. Three different structural systems specified in TSC 2018 were used in the designed models. These structural systems used; RC frame structures, RC wall-frame structures and RC wall structures. These structures were analyzed by Response Spectrum Method which is linear analysis method and base shear forces were obtained. Then, push-over analysis, which is a nonlinear analysis method, was applied to obtain the base shear forces that the structure can actually carry. After the analysis, the quantities of materials to be used for the construction of the structural systems of the models were calculated and current manufacturing prices and rough costs were calculated. In order to compare the obtained costs with the structural performances, nonlinear shear forces and linear shear forces ratios were calculated and the over strength factors were calculated for each model. In the light of the data obtained from the studies in the literature, when the over strength factors and cost values are examined together, it is concluded that the optimum design for the conditions specified in TSC 2018 will be provided with the RC wall ratio between 0.001 - 0.0016. It is concluded that lateral load carrying capacity of construction increases up to 650% by increasing the construction cost by 17% for the designed models.