Person: TİMURAĞAOĞLU, MEHMET ÖMER
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TİMURAĞAOĞLU
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MEHMET ÖMER
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Publication Analytical validation of macromodeling techniques of infilled rc frames(Springer Int, 2019-07-01) Timurağaoğlu, Mehmet Ömer; Doğangün, Adem; Livaoğlu, Ramazan; TİMURAĞAOĞLU, MEHMET ÖMER; DOĞANGÜN, ADEM; LİVAOĞLU, RAMAZAN; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/İnşaat Mühendisliği Bölümü.; 0000-0002-6329-905X; 0000-0002-1867-7103; 0000-0001-8484-6027; ABF-2355-2020; M-6474-2014; AAR-6126-2020The present study focuses on validation of compressive strut models, in which infill wall is replaced with single and multi-equivalent diagonal struts. A full-scaled, one-bay and one-story reinforced concrete (RC) frame, representing weak sides of existing buildings widely used in Turkey, is produced and tested under lateral cyclic loading. Furthermore, the efficiency of three different strut models, commonly used in the literature to present the effects of walls on the RC frames, is investigated using finite element method. Consequently, the analytical results show that single equivalent strut model is an easy and influent way of representing global behavior of infilled RC frames. Additionally, using multi-struts will only cause small variations in global behavior of the system, whereas the failure mode of the RC frame is more accurately represented compared to single strut.Publication Investigation of the infill wall effect on the dynamic behaviour of RC frames(Ediciones Univ Oviedo, 2015-01-01) Timurağaoğlu, M. Ömer; Livaoğlu, Ramazan; Doğangün, Adem; Aenlle, M. L.; Pelayo, F.; Canas, F. J. C.; Prieto, M. G.; Hermanns, L.; Rey, M. J. L.; FraileDeLerma, A.; Canteli, A. F.; TİMURAĞAOĞLU, MEHMET ÖMER; LİVAOĞLU, RAMAZAN; DOĞANGÜN, ADEM; Uludağ Üniversitesi/Fen Bilimleri Enstitüsü.; Aenlle, M. L.; Pelayo, F.; Canas, F. J. C.; Prieto, M. G.; Hermanns, L.; Rey, M. J. L.; FraileDeLerma, A.; Canteli, A. F.; 0000-0002-6329-905X; 0000-0001-8484-6027; 0000-0002-1867-7103; AAR-6126-2020; S-4676-2019; M-6474-2014; ABF-2355-2020The simplicity of construction and economic reasons have made the infilled frame one of the most preferred structural form for reinforced concrete (RC) frame buildings around the world. For these reasons, the usage of infill walls with reinforced concrete frames increased rapidly over the past decades. On the other hand, although the reinforced concrete frame-infill systems are commonly used throughout the world, the infill is rarely included in the numerical analysis of the structures. For this reason the main goal of this study is to investigate, obtain and compare the dynamic characteristics such as natural frequencies, mode shapes and damping ratios of RC frames with and without infill wall by using classic vibration test results within elastic limit. In addition, the contribution of infill wall to the RC frame behavior for the small strain level is also the target of this paper. For this purpose, full scaled, one bay and one storey RC frames with and without infill wall are constructed and tested.Enhanced Frequency Domain Decomposition technique is used in order to attain the experimental dynamic characteristics of the frames. The results from tests showed that the forced vibration test measurements are sufficient and satisfying to identify the dynamic properties of the RC frames for both with and without infill walls. Furthermore, addition of infill wall to the bare frame does not have an important effect on the dynamic characteristics of the system for small strain level. On the other hand, it is shown that the application of plaster to the infill wall changes the dynamic behavior of the system significantly even for such a so small forces used in this study.Publication P-Y curves for laterally loaded single piles: Numerical validation(Taylor, 2021-08-23) Timurağaoğlu, Mehmet Ömer; Fahjan, Yasin; Doğangün, Adem; TİMURAĞAOĞLU, MEHMET ÖMER; DOĞANGÜN, ADEM; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/İnşaat Mühendisliği Bölümü; 0000-0002-6329-905X; 0000-0002-1867-7103; AAR-6126-2020; ABF-2355-2020Pile foundations are widely used in marine and coastal engineering structures. The correct analysis method must be used to ensure the safety of piled systems used in marine and coastal structures. Despite several methods available in the literature, the numerical method is increasingly applied for understanding the loading mechanism of pile-soil interaction under vertical, lateral, or seismic loadings. The present study focuses on the numerical validation of centrifugal test results of the single pile in dense sand under lateral loading. An extensive parametric study is carried out to validate numerical models due to the lack of experimental tests such as shear or triaxial tests. In the numerical model, the soil is represented by a kinematic hardening model, which is simple to calibrate in finite element analysis, whereas pile is modeled as an elastic material. The p-y family of the curve is back-calculated for a single pile and an algorithm is generated. Two interface models between soil and pile, namely full contact and frictional slip contact, are investigated to represent the behavior under horizontal loading. Then, the analyses are extended to vertical loading to assess the influence of interface models.Publication Investigation of snow-induced collapse in Bozuyuk market(Elsevier, 2020-12-01) ALMahdi, Fikrat; Doğangün, Adem; Genç, Fatih; Rasekh, Waheed; Timurağaoğlu, Mehmet Ömer; ALMahdi, Fıkrat; DOĞANGÜN, ADEM; Rasekh, Waheed; TİMURAĞAOĞLU, MEHMET ÖMER; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/İnşaat Mühendisliği Bölümü; 0000-0002-1867-7103; 0000-0002-6329-905X; 0000-0002-9373-9589; AAR-6126-2020; ABF-2355-2020; ABE-2272-2020; DMA-8361-2022Heavy snowfall and frost are common phenomena in some areas of Turkey. Since it is an active seismic region, most engineering efforts focus on the impact of seismic loads. Meanwhile, the evaluation of structural and non-structural damages caused by snow loads are less of a concern. Depending on region geographical characteristics, snow is considered one of the most critical loads, especially in the case of large spans industrial structures, sport facilities and malls. This study investigates the snow induced failure of Bozuyuk Market in Turkey. An evaluation of the attributed reasons behind the reported collapse is provided. To investigate the critical regions of the structural systems, a finite element model has been generated, linear and nonlinear static push-down analysis are carried out for the collapsed portion of the structure of interest. The snow load calculations are compared in regard to national standards TS 498 and TS EN 1991-1-3. It has been found that the construction defects were the primary reason behind the partially failure of the investigated roof. The paper highlights the urgent need to upgrade the national standards regarding snow loads to go along with the changes in snowfall density and frequency due to accelerated climate change.Publication Numerical investigation on p-y method of group piles under static and dynamic loads(Springer, 2022-08-26) Timurağaoğlu, Mehmet Ömer; Fahjan, Yasin; Doğangün, Adem; TİMURAĞAOĞLU, MEHMET ÖMER; DOĞANGÜN, ADEM; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/İnşaat Mühendisliği Bölümü.; 0000-0002-6329-905X; 0000-0002-1867-7103; AAR-6126-2020; ABF-2355-2020The present study aims at scrutinizing the static and dynamic behavior of pile-soil interaction in the context of p-y method using finite element analysis. For this purpose, a series of static and dynamic analyses are carried out for single pile, 2 x 2 and 3 x 3 group piles in homogeneous clayey soil. In the analysis, the nonlinear behavior of soil is taken into account using a kinematic hardening model, while piles are modeled as elastic. The soil model parameters are calibrated using experimental modulus degradation and damping curves. The pile-soil interface is modeled considering normal and shear behavior to account for separation and sliding between soil and pile elements. In the static analyses, variation of pile moments and displacements with depth and the back-calculated p-y curves are evaluated. The soil resistance is directly obtained by extracting the shear and normal forces of the nodes in a pile at any depth. The p-multipliers for 2 x 2 and 3 x 3 group piles are calculated and compared with that of the experiments. The variation of p-multipliers with depth and lateral displacement is also evaluated. In dynamic analyses, first, site response analyses are carried out and validated against one-dimensional results under different loading frequencies. Infinite elements are applied at the boundaries to provide non-reflective boundaries. Later, single, 2 x 2 and 3 x 3 group pile analyses are executed. The influence of loading amplitude and frequency on the response are investigated using moment-depth and displacement-depth relationships. Dynamic p-y curves are back-calculated and the results are deeply assessed by comparing with static curves.