Sürdürülebilir Kalkınma Amaçları

• 11
• 8
• 7

• MakaleAçık Erişim2024Scopus SJRQ1/r/munzur/1719
  Effect of White-Portland cement containing micro and nano silica on the mechanical and freeze-thaw properties of self compacting mortars

  Etli, Serkan; Yılmaz, Tekin; Hansu, Osman

  This study concentrated to investigate the influences of white-Portland cement (W-PC) containing silica fume (SF: micro-silica (µSi) and nano-silica (nSi)) as replacement (2–4 wt%) on mechanical (strength and durability), physical and microstructural behaviors of self-compacting mortars (SCMs) fabricated at 0.48–0.63 w/b ratios. In keeping with these purposes, besides of carrying out the workability (mini-slump flow: M−SF and V-funnel: V-F) experiments of SCMs, the mechanical and microstructural tests implemented were: unconfined compressive strength (UCS), flexural strength (FS), freeze–thaw (F-T) and scanning electron microscope (SEM) analysis. The outcomes displayed that, in comparison with the control, replacing W-PC by SF (particularly nSi) enhanced the UCS and FS, resisted against F-T durability by lowering the strength losses in UCS and FS. The ameliorated microstructure resulting in a reduction in the number and/or a narrowing in the size of micro-cracks and pores contributed to generate a more compact and consolidated SCM structure for the improving of strength and durability due of pore-filling effect and superior pozzolanic characteristics of µSi and especially nSi, this in turn reduced the permeability of SCM, which has a significant effect on the strength and durability behaviors of the SCM.

  • 
  AtıfScopus16·WoS16·OpenAlex19

  İncele
• MakaleYalnız künye2024Scopus SJRQ1/r/munzur/1685
  Investigation of the variation of mechanical and durability properties of elements manufactured with rubber substituted SCMs with element height

  Akgül, Melek; Etli, Serkan

  Controlling the homogeneous distribution of granulated rubber materials added to self-compacting concrete/mortars along the height is of great importance in terms of preserving and defining the holistic behavior of structural elements. In this study, the effect of EPDMGR (ethylene propylene diene monomer granulated rubber) ratio (0 %, 5 %, 10 %, 15 %, 20 % and 25 %), test age, L/D (slenderness ratio) and element test zone (bottom, middle and top) on the mechanical properties (flexural and compressive), durability properties (porosity and sorptivity) of the elements produced with SCM were evaluated. The results obtained were statistically evaluated by GLM-ANOVA. It was observed that flexural tensile strength was strengthened up to 5 % substitution rate due to the hydrophobic properties and elasticity properties of EPDMGR used, while porosity values increased with height in the upper regions compared to the lower regions due to the placement properties of SCM. Differences in compressive strength appeared in the upper and lower sections after 5 % EPDMGR substitution. This indicates that for the mixture properties used, the properties examined in terms of mechanical and durability test results may have different properties with limited variability in terms of L/D ratio depending on the EPDMGR ratio used and the region where the element was taken.

  • 
  AtıfScopus7·WoS7·OpenAlex10

  İncele
• MakaleAçık Erişim2023/r/munzur/6441
  Comparative Analysis of Composite Buildings Produced in National and International Standards

  Etli, Serkan; Akgül, Melek

  Composite moment resisting frame buildings with 5-, 10-, 15- and 20-story concrete filled steel tube columns and composite beams were modelled. The buildings are designed according to Turkish Code for Design and Construction of Steel Structures-2016 (TCDCSS-2016) and Türkiye Building Earthquake Code-2018 (TBEC-2018) regulations at high ductility levels. The design of the DCH structures was designed in ZC ground for a 0.79 g PGA. While choosing the design location, it is assumed that the construction will be made in a region between the North Anatolian fault line and the East Anatolian fault line, that is, in a region with high earthquake risk. Within the scope of the study, SeismoStruct [1] software was used during the design and performance evaluation of the structures. Nonlinear static push and incremental dynamic analyses were used. Uniform and triangular load distributions were adopted in the PO analysis, and 16 earthquake ground motions were used in the dynamic analysis. The effect of story number on the seismic behavior of CMRFs was investigated using nonlinear analysis results. Accordingly, variation in lateral response, overstrength factors, ductility, and section capacity change of members for CMRF structures were presented. In addition, a mutual evaluation was made with the performance parameters obtained from previous studies with similar geometries.

  • 
  • 
  AtıfOpenAlex3·TR Dizin2

  İncele
• MakaleAçık Erişim2023/r/munzur/6367
  Behaviour of Composite Buildings Designed with TBDY 2018 in Main and Aftershocks

  Etli, Serkan; Akgül, Melek

  Within the scope of the study, the designs of the structures consisting of 5, 10, 15 and 20 story moment resisting composite frames were carried out for TBDY 2018 and ZA group soils. The behavior of the designed structures was evaluated by using dynamic analysis in the time history domain. The earthquakes used were selected in series consisting of the main earthquake and aftershocks. The results obtained were evaluated in terms of roof displacements, base shear coefficients, interstory drift and base accelerations. The structures examined within the scope of the study show excellent behavior under the influence of the main and aftershocks.

  AtıfOpenAlex1·TR Dizin2

  İncele
• MakaleAçık Erişim2023Scopus SJRQ3/r/munzur/2786
  Performance evaluation of steel-concrete composite structures designed in poorly graded soils

  Etli, Serkan

  In this study, the seismic behavior of steel concrete composite buildings in a specific region was investigated. For this purpose, 5-, 10-, 15- and 20-storey composite moment-resisting framed structures were designed. Moment-resist-ing composite framed structures are modeled with concrete-filled steel tube columns and designed and modeled using composite beams. The buildings are designed according to ÇYTHYE-2016 and TBEC-2018 regulations at design levels with high ductility. In the design of the designed structures, the peak ground acceleration value is 0.79 g, and the design ground is planned as ZE class. SeismoStruct software was used for the design and performance evaluation of the structures. During the performance evaluations of the structures, nonlinear static pushover and incremental dynamic analyzes were used. Uniform and triangular load distributions are adopted in the static pushover analysis and 16 earthquake ground mo-tions are used in the incremental dynamic analysis. Evaluation of the effect of the number of stories on the earthquake behavior of composite moment-resisting framed structures was investigated using the non-linear analyzes mentioned. Ac-cordingly, lateral response, overstrength factors, ductility, and dynamic behavior factor values for composite frame struc-tures were calculated and presented using the relevant analysis results. It has been calculated that the behavior factor of all moment-resisting composite framed structures can perform well above the design assumptions, whereas moment-resistant composite framed structures absorb seismic energy by using inelastic deformations. Ductility is almost 30% higher than the design assumption for international standards. As a result, it was concluded that these structures could continue to serve theoretically.

  • 
  • 
  AtıfScopus6·WoS3·OpenAlex9

  İncele
• MakaleAçık Erişim2023Scopus SJRQ3/r/munzur/2690
  Effect of glass sand used as aggregate on micro-concrete properties; [Učinak recikliranog stakla kao agregata na svojstva mikrobetona]

  Etli, Serkan

  Micro-concrete (MC) can be defined as a high-performance cement-based material produced using microaggregates and cement in the required proportions. Owing to its high performance, it has the potential to be used in the structural repairs of existing building elements. Within the scope of this study, an evaluation was conducted by creating a usage scenario under which glass, which is a waste product, can be reduced and applied in a way that provides a sufficient MC performance. There are four different binder contents in the mixtures within the scope of the present study, i.e., 570, 580, 599, and 658 kg/m3. From these mixtures, together with the control mixture, 12 %, 27 %, and 50 % microaggregates were replaced with glass sand and 16 different mixtures with a total of 4 different aggregate contents were produced. For the mechanical, physical, and durability tests, 40 × 40 × 160 mm sized prisms and 50 × 50 × 50 mm sized cubes were produced. For the purposes of this research, mechanical tests were carried out on 144 7-, 28- and 56-day old prismatic specimens. In addition, the effects of a freeze-thaw and temperature on the mechanical properties were investigated on 192 prismatic samples. In determination of the durability, physical properties such as the porosity, sorptivity, and specific gravity were tested and determined using cubic samples. The test results show that the replacement of MA with GS has positive effects on all mechanical behaviours of MC.

  • 
  AtıfScopus7·OpenAlex12

  İncele
• MakaleYayıncıda açık erişim2023Scopus SJRQ1/r/munzur/2453
  Evaluation of the effect of silica fume on the fresh, mechanical and durability properties of self-compacting concrete produced by using waste rubber as fine aggregate

  Etli, Serkan

  The supply of sand, which is obtained by disposing of natural resources for the purpose of concrete production and in accordance with production standards, is increasing rapidly and therefore its amount is rapidly depleted. A study is presented that aims to reduce the aggregate content by using this waste tire aggregate (WTA) in the construction industry, and thus, a sustainable production and conservation of nature is the basis. The water/binder ratio used in the study is kept constant as 0.39 and the binder dosage as 550 kg/m3. WTA and SF are replaced with sand and cement at the ratios of 5%, 10% and 15% by volume, and 5% and %15 b y weight, respectively. The fresh (slump flow, V-funnel, and L-box) and hardened (axial compression, splitting tensile strength, flexural tensile strength, diagonal tensile strength, and modulus of elasticity, chlorine penetration and sorptivity) properties of self-compacting concrete (SCC) mixtures produced in this way are evaluated. For the mechanical and durability tests, a total of approximately 500 SCC (100 × 100 × 500 mm: prism, 100 × 100 × 100 mm: cube and 100 × 200 mm: cylindrical) samples are produced. The mechanical experiments of SCC were carried out at 28-, 56- and 90-days age. The test results have shown that WTA substitute concrete, which can be used in terms of civil engineering in terms of all these features, has shown that it has sufficient performance.

  • 
  • 
  AtıfScopus51·WoS43·OpenAlex55

  İncele
• MakaleYalnız künye2023Scopus SJRQ2/r/munzur/2333
  Effect of Using Eccentric Braces with Different Link Lengths on the Seismic Demand of CFST Column-Composite Beam Frames Subjected to Near-Field and Far-Field Earthquakes

  Etli, Serkan; Güneyisi, Esra Mete

  In recent years, in the light of technological developments, the utilization of composite members that enable the use of superior properties of concrete and steel together in earthquake-resistant building design has become widespread. In this study, 5-, 8-, 10-, 13- and 15-story composite moment-resisting framed buildings were designed using composite beams and concrete filled steel tube columns. The effect of using steel braces and the variation of the link length of the eccentric steel braces on the seismic demand of the composite buildings were investigated. For this, eight different cases with braces were considered and compared with the bare structure. The first case had concentric braces (having no link), and the other seven cases had eccentric steel braces with different link lengths classified as short, medium and long. The nonlinear dynamic response of braced and non-braced composite structures was evaluated under the effect of earthquake groups of far-field, near-field with and without pulse effects. Each earthquake group includes ten different ground motion records. SeismoStruct which is a fiber element-based software was used in modeling and analysis of the structures. Seismic behavior of the case studied structures was investigated comparatively through the demand parameters such as the maximum inter-story drift ratios, the maximum roof drift ratios and the deformation states in the structural elements. It was observed that the inclusion of the steel braces provided significant gains in dissipating seismic energy acting through composite buildings and the beam/column deformations decreased considerably, depending on the length of the link and the height of the structure. In some cases, significant damage was monitored in the link members; however, this type of deformation was limited.

  • 
  AtıfScopus3·WoS3·OpenAlex18

  İncele
• MakaleAçık Erişim2022/r/munzur/6518
  Kyb'de kullanılan cam kumun kyb yük-deplasman ilişkisinin davranışı üzerindeki etkisinin araştırılması

  Etli, Serkan

  Doğada atık olarak bulunan cam, özellikle son yıllarda sıcaklığın artmasıyla birlikte ormanlık alanlarda ve düzenli depolama alanlarında çıkan yangınların sebepleri arasında görünmektedir. Çalışma kapsamında atık sahalarından ve doğal ortamdan toplanan atık soda cam şişeleri öğütüldükten sonra 0.25-0.5 mm arasında eleklerden geçirilerek ayrıştırılmıştır. Bu cam kum ile üretilen kendiliğinden yerleşen beton (KYB), içindeki doğal kum ile değiştirilmiştir. Doğal kum ve cam kumu, hacimce %5 ila %35 arasında %5'lik artışlarla ikame edilmiştir. KYB, yönetmeliklerle ilgili standartları sağladığı taze özellik testleri ile test edilmiştir. Elde edilen karışımlardan 7 ve 28 günlük numunelerde gerilme-şekil değiştirme ilişkileri elde edilmiştir. Elde edilen bu ilişkiler literatürde sıklıkla kullanılan beton modeli ile karşılaştırılarak değerlendirilmiştir. Ortaya çıkan yük-deplasman ilişkilerinin özellikle 7 günlük yaşta iyi bir şekilde seçilen modele yakınsadığı ancak özellikle başlangıç kısmında 28 günlük yaşta kullanılan modelden ayrıldığı görülmüştür.

  • 
  AtıfOpenAlex10·TR Dizin3

  İncele
• MakaleAçık Erişim2022/r/munzur/6502
  Rijit Bodrum Perdelerinin TBDY 2018 ile Tasarlanan Az Katlı Yapılardaki Etkisi Üzerine Bir İnceleme

  Etli, Serkan

  Çalışma kapsamında rijit bodrum perdelerinin 6 katlı betonarme bir binanın davranışına etkisi incelenmiştir. İncelenen yapının tasarımı, TBDY-2018'e uygun olarak 3 boyutlu olarak SeismoStruct yazılımında gerçekleştirilmiştir. Bunun için bina ilk etapta ZD sınıfı katta rijit bodrum perdeleri ile tasarlanmıştır. Daha sonra bu rijit bodrum perdeleri kaldırılarak ikinci bir yapı elde edilmiştir. Sonuç olarak bu iki yapının yatay yükler altındaki performansları incelenmiştir. Her iki durumda da yapılar 3 boyutlu olarak incelenirken doğrusal olmayan statik itme analizlerine tabi tutulmuştur. Modeller, iki farklı yatay yükleme koşuluyla doğrusal olmayan artımlı statik itme analizi ile her iki tasarım yönü için analiz edilmiştir. Sonuç olarak, rijit bodrum perde duvarlı ve perdesiz binanın performans faktörleri, aşırı güç faktörü, doğal aşırı güç faktörü, süneklik ve rijitlik faktörü değerleri açısından karşılaştırmalı olarak değerlendirilmiştir.

  • 
  AtıfOpenAlex4·TR Dizin4

  İncele