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- Yüksek Lisans TeziYalnız künye2026Farklı özelliklerdeki tarihi minarelerin sonlu elemanlar yöntemi ile dinamik karakteristiklerinin belirlenmesi
Yusuf Saraçoğlu
Bu tez çalışmasında, Gümüşhane İli Süleymaniye Mahallesi'nde bulunan üç farklı tarihî yığma minarenin dinamik karakteristikleri sonlu elemanlar yöntemiyle karşılaştırmalı olarak incelenmiştir. Çalışmanın temel amacı, aynı malzeme parametreleri kullanılarak farklı geometrik özelliklere sahip minarelerin doğal frekans, periyot ve mod şekillerindeki değişimleri ortaya koymaktır. Bu kapsamda minarelerin kaide, gövde, şerefe, petek ve külah bölümlerine ait geometrik ölçümleri yapılmış ve ANSYS Mechanical APDL ortamında üç boyutlu sayısal modelleri oluşturulmuştur. İncelenen minarelerin malzeme özellikleri, yapıya zarar vermeyen tahribatsız yerinde değerlendirmeler, saha gözlemleri ve literatürde tarihi yığma yapılar için kabul gören yaklaşık malzeme parametreleri birlikte dikkate alınarak belirlenmiştir. Yapılan değerlendirmeler sonucunda elde edilen bulguların literatürdeki benzer tarihi taş yığma minare değerleriyle uyumlu olması nedeniyle, üç minare için ortak malzeme parametreleri kullanılmıştır. Böylece analiz sonuçlarındaki farklılıkların daha çok minarelerin yükseklik, kesit düzeni, gövde genişliği, şerefe konumu ve genel narinlik oranı gibi geometrik özelliklerinden kaynaklanması hedeflenmiştir. Modal analizler sonucunda elde edilen frekans, periyot ve mod şekilleri karşılaştırılarak minarelerin dinamik davranışları değerlendirilmiştir.
- MakaleAçık Erişim2026Dynamic and Mechanical Properties of Nanoparticle Doped Aramid/Glass Fiber Reinforced Interply Hybrid Composites
Sadik, Ayşegül Cansu; Karabudak, Filiz; Kula, Muhammed Emin
In this study, the mechanical and dynamic properties of glass/aramid interply hybrid composites reinforced with four different nanoparticles were investigated. Firstly, matrix modification was performed and composite plates were manufactured by hand lay-up technique. Silicon dioxide (SiO2), graphene (GNP), silver (Ag) and cerium oxide (CeO2) nanoparticles were added to the epoxy matrix as reinforcement. With the addition of nanoparticles, the highest tensile (16%) and flexural (67.3%) strengths were observed in Ag reinforced composites. Tensile (16.8%) and flexural (14.4%) strengths decreased with the addition of graphene nanoparticles. Tensile and flexural tests revealed delamination, matrix and fibre rupture in all plate types. As a result of modal analysis, the highest natural frequency values and the lowest damping ratios were determined in the FFBC boundary condition. The addition of nanoparticles improved the mechanical properties of the composites in general.
- MakaleYalnız künye2023Scopus SJRQ1Full-scale structural evaluations of İskenderpaşa minaret
Aymelek, Abdullah; Yanik, Yusuf; Demirtaş, Betül; Yildirim, Ömer; Çalik, İsmet; Türker, Temel
Nowadays, innovative methods have been used for observing and structural evaluating of historical structures. In this paper, it is presented the full-scale structural assessments of a minaret after a Finite Element model calibrating according to vibration test results. Also, the structural behaviours under earthquake and wind loads were identified by considering the environmental effects on the selected masonry minaret of İskenderpaşa Mosque. First of all, modal analysis was executed on the three-dimensional Finite Element model created according to field survey in ANSYS Workbench. In-situ vibration tests were implemented at different intervals by using developed vibration measurement system. The experimental modal parameters were attained from collected signals. The experimental results were used as reference values in model calibration of this minaret to reflect the existing structural behaviour. Model calibration process was carried out on the initial model both by changing of material properties of masonry wall and by taking into account the interactions with mosque walls and ground. Full-scale structural evaluation was carried out under earthquake and wind loads on both the initial and the calibrated models in the weak direction of this minaret. The top displacements, drift ratios, principal stress values and their distributions were determined. It was shown that the analyses on the calibrated model produce more realistic structural behaviour.
AtıfScopus21WoS20
İncele - MakaleYalnız künye2022Scopus SJRQ1A comparative study to determine seismic response of the box culvert wing wall under influence of soil-structure interaction considering different ground motions
Ozturk, Kasif Furkan; Cakir, Tufan; Araz, Onur
The present study deals with evaluation of the effects of different ground motions, backfill-structure interaction (BSI) and soil-structure interaction (SSI) on dynamic response of a box culvert wing wall. In obtaining numerical results, five different earthquake records with different frequency contents, five different backfill types and four different subsoil types are taken into account. Firstly, a finite element model (FEM) and three analytical models are proposed for analysis of the wing wall-backfill system under fixed-base case, and these fixed-base models are compared with each other through both modal analysis and displacement time-history analysis under the assumption of linear-elasticity. After validating the ability of the FEM approach, by extending the fixed-base FEM to take account of elastoplastic behavior of soil and SSI, a three dimensional (3-D) model has been described, and 3-D nonlinear analyses have been carried out in time domain. The numerical results show that the seismic response of the wing walls are affected remarkably by the SSI, BSI and frequency content of the earthquake.
AtıfScopus20WoS19OpenAlex20İncele
