Aksoylu, Ceyhun
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Aksoylu, C.
Aksoylu, Ceyhun
Aksoylu, Ceyhun
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caksoylu@ktun.edu.tr
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02.02. Department of Civil Engineering
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| Case Studies in Construction Materials | 7 |
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Article Citation - WoS: 1Citation - Scopus: 2Shear and Flexural Performance of Reinforced Concrete Beams with Recycled Concrete Aggregates(De Gruyter Poland Sp ZOO, 2025) Ozkilic, Yasin Onuralp; Althaqafi, Essam; Karalar, Memduh; Aksoylu, CeyhunThis study investigates the effects of recycled concrete aggregate (RCA) content and stirrup spacing on the structural performance of reinforced concrete beams (RCBs) under flexural and shear loading. A total of 24 RCB specimens were cast with RCA replacement ratios of 0, 10, 20, and 40%, and tested under four different stirrup spacings: 100, 160, 200, and 270 mm. The experimental program evaluated key structural parameters, including load-bearing capacity, stiffness, ductility, and energy dissipation. The results demonstrated that increasing the RCA content generally led to reductions in both flexural and shear strength. The most significant shear strength loss (46.86%) occurred at 40% RCA with 270 mm stirrup spacing, while the highest flexural load reduction (11.24%) was observed in beams with & Oslash;10 longitudinal reinforcement and 40% RCA. Moreover, although higher RCA content generally reduced stiffness, ductility, and energy dissipation, specimens with wider stirrup spacing exhibited relatively better performance under shear, suggesting that transverse reinforcement can partially mitigate RCA-induced performance losses in shear-dominated beams. These findings suggest that while RCA can be used in RCBs, proper detailing of transverse and longitudinal reinforcement is essential to maintain adequate structural performance.Article Citation - WoS: 27Citation - Scopus: 35A Comparative Study on Asce 7-16, Tbec-2018 and Tec-2007 for Reinforced Concrete Buildings(PONTIFICIA UNIV CATOLICA CHILE, ESCUELA CONSTRUCCION CIVIL, 2020) Aksoylu, Ceyhun; Mobark, Ahmed; Arslan, Musa Hakan; Erkan, İbrahim HakkıDoctrines of earthquakes and also the latest approaches of earthquake resistant building design in standards need to be revised periodically. While the revisions and updates in the American standards occur over periods of three or five years including limited subjects, in Turkey the same revisions are done once over long periods including the whole subjects of the standards. As examples the standards of 1975, 1998, 2007 and finally 2018 could be given. Especially, in 2018 standard (TBEC-2018) many changes were made over concepts and criteria. The procedure of calculating the earthquake loads in 2018 standards is similar to the one in the American standards of (ASCE-7- 16), however for the element design the changes are shown as developments over the one of 2007 earthquake standard (TEC-2007). The changes made by 2018 standard for calculations of earthquake loads and their effects on civil engineering are very important factors of new building design. The earthquake load affecting a building which is the first factor of earthquake resistant building design shows important differences according to the condition changes in the standard. Based on this motivation in this study reinforced concrete frame type buildings of different elevations were researched by using ETABS (structural software for building analysis and design) according to linear equivalent seismic load method. According to the analysis results of the chosen buildings, a comparison forthe base shear force, top displacement and relative story displacement between TEC-2007, TBEC-2018 and ASCE 7-16 standards was carried out. From the analysis results, it is found that for most of the soil classes while the maximum base shear forces in 3 and 5- story buildings are achievedat TEC-2007, the maximum base shear forces in 7 and 9- story buildings are achieved at TBEC-2018. Also, it is predicted that the higher increment in the design forces of buildings with higher elevations is obtained at TBEC-2018 for strong soils, and at TEC-2007 for weak soils. By considering cracked sections at TBEC-2018 the calculations displacement and period was affected as periods in TBEC-2018 were increased by almost 34% respected to TEC-2007. The same increment ratio was determined for ASCE 7-16 as 45%. Also, as a response for the increments in period, the spectral acceleration determined from the elastic spectrum diagram was decreased. At the end of the study, nonlinear performance analysis was also performed and performance points were determined according to the demand spectra of the seismic codes. ASCE's demand displacement values are in any case lower than Turkish codes. TBEC-2018 reveals less displacement demands in high-rise buildings than TEC-2007. The closest results for the three regulations occurred on the softest grounds.According to the results obtained from the static pushover analysis, a ductile behavior occurred in all of the structural systems and plastic hinge mechanism started from the beams firstly.Article Citation - WoS: 4Citation - Scopus: 6Experimental and Numerical Investigation of Shear Strength at Dapped End Beams Having Different Shear Span and Recess Corner Length(Elsevier Science Inc, 2023) Aksoylu, Ceyhun; Özknliç, Yasin Onuralp; Arslan, Musa HakanThe geometric properties of the support region of dapped end beams (DEBs) cause a significant change in the ratio of the distance between the support and suspension reinforcement (a) to the effective depth (d). This ratio is effective in the shear capacity of DEB. In addition, in the ratio of the distance of the load on the beam from the support (av) to the depth of the beam (deff) is also effective on the behavior of the beam under vertical loads. For the first time in the literature, the combined effects of these two ratios on the shear capacity of DEBs was investigated by experimental and numerical methods in this study. Firstly, an experimental study was carried out having 1/1 cross-sectional scale six different DEBs. In the experimental study, while the a/d ratio was kept constant as 1.8, the av/deff ratio was varied between 0.75 and 3. The experiments results indicate that towards increasing the av/deff ratio, the DEBs failed by flexure. The strength of DEBs decreases with an increase in the av/ deff ratio. With smaller av/deff, the DEBs show greater stiffness and ultimate load. Numeric finite element models by using ABAQUS were verified by the load-displacement relationships and damage modes obtained from these experiments. After that, at the parametric stage of the study numeric models were also constructed in order to further investigate the effect of different a/d ratios and av/deff on the strength of DEBs. According to all test and numeric results, it is recommended that DEBs should be placed on the supporting member by considering the minimum a/d ratio. Otherwise, the capacity of the DEBs will be significantly reduced since the damage in the thinned zone will occur at lower load levels. At the end of study, considering the combined effects of a/d and av/ deff, a shear capacity reduction coefficient based on these parameters has been proposed. The shear capacity, which is reduced using the proposed coefficient, approaches the numerical results, which converge to a great extent with the experimental data by 92.46%.Conference Object Prefabrike İnceltilmiş Aşık Uçlarının Deneysel ve Numerik Sonlu Eleman Analizlerinin Karşılaştırılması(2019) Özkılıç, Yasin Onuralp; Aksoylu, Ceyhun; Yazman, Şakir; Gemi, Lokman; Arslan, Musa HakanConference Object Kesme Donatısı Yetersiz Ön Hasarsız Betonarme Kirişlerin Yenilikçi Bir Yaklaşımla Güçlendirilmesi: Mekanik Çelik Dikişler(2022) Uysal, Yusuf; Aksoylu, Ceyhun; Özkılıç, Yasin Onuralp; Arslan, Musa HakanBu çalışmada kesme kapasitesi yetersiz betonarme kirişlerin güçlendirilmesine yönelik pratik, ekonomik ve inovatif bir güçlendirme yöntemi araştırılmıştır. Bunun için kesme açıklıkları boyunca kirişin her iki yüzüne dıştan U şeklinde Mekanik Çelik Dikişler (MÇD) 45° ve 90° açı ile uygulanmıştır. Yapılan güçlendirme sonrası değişen davranış değişimlerini gözlemlemek için düşey yükler altında dört noktalı eğilme deneyleri yapılmıştır. Çalışmada, ½ geometrik ölçekli 125 x 250 x 2500 mm boyutlarında biri referans olmak üzere toplam 3 adet betonarme kesmekritik kiriş üretilmiştir. Kirişlerde kesme kapasitesinin yetersiz olması için etriyeler Ø6 / 350 mm olarak seçilmiştir. Ayrıca uygulanan MÇD’nin kesme kapasitesine katkısını görebilmek için çekme donatısı 3Ø16 ve basınç donatısı 2Ø12 olarak seçilmiştir. Seçilen bu yüksek boyuna donatı oranı sayesinde MÇD’nin kesme kapasitesine katkısı tespit edilmeye çalışılmıştır. Bunun için numunelerden bir tanesi güçlendirilmeden referans olarak test edilirken diğer iki numune sırasıyla d/5 (45mm) aralıkla 45° ve 90° MÇD uygulanarak güçlendirilmiştir. Yapılan deneysel çalışma sonucunda referans numuneye (RN) göre 45° ve 90° güçlendirilen S-45 ve S-90 numuneler sırasıyla yük taşıma kapasitesinde %53.74 ve %14.76 artış sağlamıştır. Toplam enerji tüketme kapasiteleri karşılaştırıldığında RN’ye göre S-45 numunesinde %261.6 artış gözlenirken, S-90 numunesinde %93.73 artış meydana gelmiştir. Bu durum MÇD’lerin güçlendirmede 45 derece olarak uygulanmasının daha etkili olduğunu göstermiştir. Ulusal ve uluslararası yönetmeliklerde olmayan ve literatür için oldukça yeni bir güçlendirme alternatifi olan MÇD’nin optimum tasarımına yönelik yapılacak yeni çalışmaların oldukça önemli olduğu düşünülmüştür.Master Thesis Gövde Boşluklu Prefabrik Betonarme Aşıkların Düşey Yükler Altında Davranışı(Konya Teknik Üniversitesi, 2022) Çeledir, Emrullah; Arslan, Musa Hakan; Aksoylu, CeyhunPrefabrik yapı sistemlerinde çatı makası veya sundurma kirişlerinin aralarındaki açıklıkların geçilmesi, çatı sisteminin ana taşıyıcı elemanlarını birbirine bağlayarak birlikte çalıştırılması ve çatı sisteminin taşıyacağı kaplama gibi ölü yüklerin çatının ana taşıyıcı elemanlarına aktarımını sağlamak amacıyla aşıklar kullanılmaktadır. Kullanılan aşıkların adet olarak prefabrik yapı projelerinde büyük miktarlarda bulunması göz önüne alındığında, bu kirişlerin yüksek eğilme bölgelerinde ve gövde orta noktasında oluşturulacak olan boşlukların özellikle üretim malzemesi olan betondan tasarruf sağlayabileceği düşünülmektedir. Bu temel düşünceden hareketle tez çalışmasında 8 cm sabit yüksekliğe sahip 24, 40, 56, 72, 3x24, 88 ve 104 cm uzunlukta yedi farklı boyutta boşluk formunun hem öngerilmeli hem de öngerilmesiz aşıklarda uygulanması ile aşıkların yük taşıma kapasitesi ve sünekliklerinde meydana gelen değişiklikler deneysel olarak incelenmiştir. Üretilen toplam 16 aşık kesme açıklığı (av/d) 3,58 olacak şekilde dört noktalı eğilme testine tabi tutulmuştur. Deneysel çalışma sonucunda oluşturlan boşlukların ve boşluk boyutunun artması ile aşık kirişlerinin eğilme kapasitesinde referans kirişlere göre belirgin bir değişim olmadığı ancak sünekliğin arttığı gözlemlenmiştir. Öngerilmesiz ve öngerilmeli aşıklarda kirişin uzunluğunun %25'inden daha uzun boşluklar basınç bölgesinde belirgin ezilme hasarı ortaya çıkarmıştır. Artan boşluk uzunluğu ile eğilme hasarlarında kesme bölgesine doğru yayılım davranışı izlenmiştir. Öngerilmeli aşıkların teorik olarak %30 toplam taşıma kapasitesine sahip olan öngerilmesiz aşık kirişlerinde öngerilmeli kirişlerden farklı olarak lineer elastik bölgedeki yük taşıma kapasitesinde daha belirgin artış görülmüştür. Enerji tüketimi kapasitesi açısından bakıldığında ise öngerilmesiz kirişlerde artan boşluk boyutu toplam enerji tüketimi ile elastik enerji tüketimini arttırırken öngerilmeli kirişlerde ise 88 ve 104 cm uzunluğundaki boşluklarda özellikle lineer elastik bölgedeki enerji tüketiminde belirgin azalma görülmüştür.Article Citation - WoS: 4Citation - Scopus: 4Experimental and Numerical Investigation of Bending Performance of Prestressed Purlins Having Different Longitudinal Web Opening(Elsevier Science Inc, 2024) Aksoylu, Ceyhun; Özkılıç, Yasin Onuralp; Çeledir, Emrullah; Başaran, Boğaçhan; Arslan, Musa HakanVariable cross-section pre-stressed precast concrete purlin (PPCP) members are frequently used in industrial buildings. Lightening these elements, which create a significant weight on the roof plane, is extremely important to reduce both concrete consumption and the weight that will affect the earthquake force. The voids left in the purlin bodies can make them even more economical. A series of experimental and numeric studies were carried out to find an answer to this research question. In the study, 8 PPCP beams with different 1/1 geometric scale web opening ratios (ranging between 7.5%similar to 35% depending on the beam length) were tested. At the end of the experimental study, the openings created in the beams did not significantly reduce the load carrying capacity. In addition, bearing capacity of the reference beam was obtained approximately 17% greater than the calculated analytical value. The results of the tests were validated utilizing ABAQUS FEM. Then, a parametric study was performed on 48 models according to three different pre-stressing levels (0.3 P, 0.6 P and 0.9 P) and three different concrete strengths (30 MPa, 40 MPa and 50 MPa). According to results, especially in PPCP with web opening ratios of 27.5% and 32.5%, both initial stiffness and ductility values increased compared to the reference beam. From the numerical models, it was revelead that the decrease in concrete strength caused a capacity loss of up to 17%, especially in beams with the highest opening ratio. It was discovered that the increase in the pre-stress level increased the stiffness and capacity, but the least increase was in the beam with the highest opening ratio.Article Citation - WoS: 2Citation - Scopus: 2Effects of Shear Wall Ratio and Location on Earthquake Performance of Reinforced Concrete Buildings Having Different Ribbed Slab Configurations(Elsevier, 2025) Uysal, Yusuf; Serdar, Ali; Aksoylu, Ceyhun; Arslan, Musa HakanThis study investigates the earthquake performance of reinforced concrete buildings designed with ribbed slab system. Analyses were performed on hypothetical models representing residential buildings in Gaziantep/Islahiye region. In this study, a total of 18 shear wall-frame structure models with three different shear wall placements in accordance with TBEC-2018 were analyzed. Wall density index (0.003, 0.005 and 0.008), shear wall locations defined as M1 (vertically placed on the outer axes), M2 (center-mounted), and M3 (parallel to the outer axes), and ribbed slab placements (parallel and staggered) are considered as variable parameters. The seismic performance of the structures was evaluated using linear and nonlinear analyses. Nonlinear static pushover analyses were used to compare capacity curves, overstrength factor, interstory drift ratios, base shear forces, overturning moments, and second-order effects for each model. As the wall density index increased from 0.003 (%25) to 0.008 (%75), the initial stiffness increased by 158 %, but this increase decreased the plastic deformation capacity and modal displacement values. Models M1 and M3 with walls positioned on the outer axes provided 20.53 % more load carrying capacity than Model M2 with the central wall. The uncracked section shell exhibited 19 %-83 % stiffer behavior, while the cracked sections absorbed more energy. No significant effect of the slab rib arrangement (parallel/staggered) on the stiffness and period was observed. As the shear wall ratio increased, the torsional period decreased by up to 55 %, and the highest torsional strength was achieved in Model M3. Low shear wall ratio models exceeded code drift limits and showed increased interstory drift differences. The results showed that shear wall placement and ratios are critical to seismic performance, and that TBEC-2018 effectively enhances safety in ribbed slab systems.Article Citation - WoS: 13Citation - Scopus: 17Influence of Ceramic Waste Powder on Shear Performance of Environmentally Friendly Reinforced Concrete Beams(Nature Research, 2024) Özkılıç, Y.O.; Althaqafi, E.; Bahrami, A.; Aksoylu, C.; Karalar, M.; Özdöner, N.; Shcherban, E.M.This investigation considered the usability of ceramic waste powder (CWP) in altered quantities in reinforced concrete beams (RCBs). In this way, it was aimed to reduce the environmental impacts of concrete by using CWP as a raw material in RCBs. 12 small-scale shear RCBs with the dimensions of 100 × 150 × 1000 mm were tested in this study. The variations of stirrups spacing and CWP ratio were examined in these specimens. The percentages of CWP by weight utilized in RCBs were 10%, 20%, and 30%, and stirrups spacings were adopted as 270 mm, 200 mm, and 160 mm. At the end of the study, it was determined that more than 10% CWP additive negatively affected the RCBs' compressive strength. The load-carrying capacity reduced between 30.3% and 59.4% when CWP increased from 0% to 30% as compared to RCB with stirrups spacing of 270 mm without CWP. However, compared to RCB with stirrups spacings of 200 mm and 160 mm without CWP, there were decreases in the load-carrying capacity as 21.4%–54.3% and 18.6%–54.6%, respectively. While the CWP ratio increased, the specimens with 160 mm, 200 mm, and 270 mm stirrups spacings obtained a lower maximum load value. However, with the increase of the CWP ratio in the specimens with 160 mm stirrups spacing, RCBs reached the maximum load-carrying capacity at an earlier displacement value. When stirrups spacing was selected as 270 mm, it was observed that the maximum load-carrying capacity of RCBs reached at a similar displacement value as the CWP ratio increased. Besides, it was resulted that the bending stiffness of RCBs reduced as the quantity of CWP enhanced. The bending stiffness decreased by 29.1% to 66.4% in the specimens with 270 mm stirrups spacing, 36.3% to 20.2% with 200 mm stirrups spacing, and 10.3% to 36.9% with 160 mm stirrups spacing. As an implication of the experiments, the use of CWP up to 10% in RCBs was realized as an economical and environmental approach and is suggested. There is some evidence to report that making use of CWP may be considered to be ecologically benign. This is due to the fact that reusing CWP may significantly reduce CO2 emissions, save energy, and reduce total power consumption. Furthermore, the experimental results were compared to the analytical calculations. © The Author(s) 2024.Article Citation - WoS: 14Citation - Scopus: 18Experimental and Analytical Investigation of Chemical Anchors's Behaviour Under Axial Tensile(ELSEVIER SCI LTD, 2020) Müsevitoğlu, Abdullah; Arslan, Musa Hakan; Aksoylu, Ceyhun; Özkış, AhmetIn this study, to observe the behavior of chemical anchors embedded in concrete under the tensile effect, 108 different anchor specimens were prepared with different parameters as concrete compressive strength, reinforcement bar diameters, anchor depths, sizes of drilled holes, cleanliness of the drilled holes. Pull-out tests were conducted and obtained data were examined with the axial-load capacities and the failure situations. Finally, the depth of anchors, compressive strength and reinforcement diameter were observed to increase the axial-load-bearing capacity. The specimens cleaned with water could bear more axial loads than cleaned using air. For the anchors installed without cleaning the holes, a significant decrease was observed in the axial-load carrying capacities compared to the other two conditions. The ANN algorithm exhibited a 78.3% prediction success compared with other algorithms. The empirical relations in the literature were found to have limited level of prediction success rates according to the ANN's results. (C) 2020 Elsevier Ltd. All rights reserved.
