Person: DOĞANGÜN, ADEM
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DOĞANGÜN
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Publication Dynamic characteristics of minarets of hoca tabip mosque(Ediciones Univ Oviedo, 2015-01-01) Livaoğlu, Ramazan; Baştürk, Mehmet Hudai; Serhatoğlu, Cavit; Doğangün, Adem; Aenlle, ML; Pelayo, F; Canas, FJC; Prieto, MG; Hermanns, L; Rey, MJL; FraileDeLerma, A; Canteli, AF; LİVAOĞLU, RAMAZAN; SERHATOĞLU, CAVİT; DOĞANGÜN, ADEM; Uludağ Üniversitesi; Aenlle, ML; Pelayo, F; Canas, FJC; Prieto, MG; Hermanns, L; Rey, MJL; FraileDeLerma, A; Canteli, AF; 0000-0001-8484-6027; 0000-0002-1867-7103; AAH-4411-2021; AAR-6126-2020; M-6474-2014; S-4676-2019With its thousands of years of history and traces from the past, Bursa is an open-air living history museum. Unfortunately Bursa is located in the earthquake zone and many catastrophic earthquakes occurred in the past. From inscriptions, it is learned that great majority of historical buildings like mosques, madrasahs, inns were damaged by the latest earthquake occurred in 1855. Because of their slender form, minarets were influenced much more than the other structures.Because one of the most important component of liabilities of our society is to preserve and transfer this historical heritage to our posterity, another problematic issue arise on this subject is the lack of literature about minarets. This is because that minarets were built in only Islamic regions. Furthermore, literature review shows that there are only a few scientific studies about seismic behavior of this type of structures. For the mentioned reasons, in this study, dynamic characteristics of Hoca Tabip Mosque which was built in 15th century, were evaluated. One of the in situ tests, modal analysis technique was carried out and the dynamic characteristics of the minaret were captured. At the same time the construction techniques were investigated. These results were compared with those obtained from the numerical model of minaret which was constituted using in situ size measuring. Finally, it was seen that the results from two approaches correspond to each other. In conclusion, it is shown that the numerical model which was carried out in this study represent actual structure with high accuracy.Publication Investigation of structural behaviour of historical Erzurum Lala Pasha Mosque using finite element method(Pamukkale Üniversitesi, 2015-01-01) Şeker, Burçin Şenol; Çakır, Ferit; Doğangün, Adem; Durmuş, Ahmet; DOĞANGÜN, ADEM; Mühendislik Fakültesi; İnşaat Mühendisliği Bölümü; AAR-6126-2020The mosques are the most important pieces of Islamic culture in terms of their architectural and structural properties. The mosques and complexes are built in the center of living areas and constituted important structures in the surroundings in Islamic culture. Therefore, it is very common to observe the mosques in almost every city center. In this study, Lala Pasha Mosque, which is located in the city, center of Erzurum and which take an important part among Erzurum's historical monuments, is investigated by means of static and dynamic analyses by the use of finite element method. The material properties and formulas, given in the literature, have been considered in order to obtain the structural behavior of the structure. The results of the analyses show that the most critical parts of the mosque are the dome, pulley, and the supports of the main arch structures that carry the main dome. Additionally, the dynamic analyses prove that the most critical parts of the mosque are the sub-sections of the main columns, the window edges, and small domes. Moreover, the narthex section has been determined one of the most critical parts in terms of seismic loads.Publication Scaling of vertical component of seismic ground motion(Elsevier, 2020-10-01) ALMahdi, Fikrat; Fahjan, Yasin; Doğangün, Adem; ALMahdi, Fikrat; DOĞANGÜN, ADEM; Mühendislik Fakültesi; İnşaat Mühendisliği Bölümü; 0000-0002-1867-7103; AAR-6126-2020; ABE-2272-2020Three-dimensional time history analysis has become a demand for the majority of updated building codes. A vast literature has addressed the selecting and scaling of horizontal component of earthquake ground motion. Meanwhile, the scaling of vertical component has been less of a concern. This paper investigates the suggestion of using the same scaling factor of horizontal component of ground motion to scale its vertical counterpart. A data set consists of 6409 mainshock records with vertical and orientation independent geometric rotated (GMRotD50) response spectra with 5% damping is used. Even though ASCE7 - 16 among other international codes recommends to use the same scaling factor for horizontal component and its vertical counterpart, this paper shows that scaling factor of vertical component trends an extreme variation from its horizontal counterpart for various soil classes, different magnitudes and over a wide range of Joyner-Boore distances. Results illustrate that the ratio of vertical to horizontal scaling factors has a strong negative relationship with the ratio of vertical to horizontal peak ground acceleration. Earthquake magnitude has no significant role on the ratio of vertical to horizontal scaling factors. A gradual increase is observed in the studied ratio over a wide range of Joyner-Boore distances. The paper ends up with simplified equations to calculate the scaling factor of vertical component in regards with the scaling factor of its GMRotD50 horizontal counterpart based on the (V/H)(PGA) ratio of the recorded components. Robust statistics manifest the goodness of the developed equations. (C) 2020 The Authors. Published by Elsevier B.V. on behalf of Faculty of Engineering, Alexandria University.Publication Comparison and assessment of material models for simulation of infilled rc frames under lateral loads(Croatian Soc Civil Engineers-hsgi, 2019-01-01) Doğangün, Adem; TİMURAĞAOĞLU, MEHMET ÖMER; DOĞANGÜN, ADEM; Timurağaoğlu, Mehmet Ömer; LİVAOĞLU, RAMAZAN; Livaoğlu, Ramazan; Mühendislik Fakültesi; İnşaat Mühendisliği Bölümü; 0000-0002-6329-905X; 0000-0002-1867-7103; 0000-0001-8484-6027; M-6474-2014; ABF-2355-2020; AAR-6126-2020; S-4676-2019In the present study, the behaviour of infilled RC frames under earthquake loading is investigated numerically, and the influence of three different concrete material models on the in-plane behaviour of infilled RC frames is evaluated using the finite element analysis (FEA). For this reason, the efficiency of infilled walls is examined on full scale models. Finite element analysis results show that mathematical model of concrete may change behaviour of infilled RC frames. The post-peak behaviour is especially influenced.Publication Critical remarks on Rayleigh damping model considering the explicit scheme for the dynamic response analysis of high rise buildings(Sage Publications Inc, 2021-07-01) Mahdi, Fikrat A. L.; Fahjan, Yasin; Doğangün, Adem; Mahdi, Fikrat A. L.; DOĞANGÜN, ADEM; Mühendislik Fakültesi; İnşaat Mühendisliği Bölümü; 0000-0002-3046-4389; 0000-0002-1867-7103; ABE-2272-2020; AAR-6126-2020This paper numerically investigates the validity of Rayleigh damping model considering explicit operator to assess the dynamic response of high rise buildings under seismic loads. Considering transverse and longitudinal seismic waves, the bending moment, shear force, axial force, and and inter story drift are evaluated for a Core wall and a frame system of 46 story each. It is found that considering the explicit scheme, the dynamic responses are amplified significantly especially for axial forces. The reported amplification can be attributed to the ignorance of stiffness proportional Rayleigh damping coefficient which is associated with the stability issue of the implemented explicit operator. The paper indicates that Rayleigh damping model does not provide the required/expected damping for the higher modes of higher frequencies hence, it is not appropriate to be used along with the explicit operator especially for buildings of wide range of frequencies. It is worth pointing out that for classical dynamic analysis which follows the implicit scheme, Rayleigh damping seems to well consider the higher modes of high frequencies with higher damping ratio in comparison to the initial mode shapes. Consequently, the literature explicit scheme should be revised to accurately consider a proper damping for the higher modes which is crucial to assess the total response of structures of long periods and wide range of frequencies such as high rise buildings among others.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; 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 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; 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 Evaluation of the effect of change in support conditions on the seismic behavior of a historical masonry bridge(Assoc Computing Machinery, 2023-12-01) Sözen, Şahin; Doğangün, Adem; DOĞANGÜN, ADEM; Mühendislik Fakültesi; İnşaat Mühendisliği Bölümü; 0000-0002-2480-9723; 0000-0002-1867-7103; AAR-6126-2020It is believed that the Yilanli(or Leylekli) Bridge (bridge with stork or snake figures) in Tokat, a city with high seismicity, was built during the Roman or Byzantine period. Although no structural damage was found on the bridge, which is still open to pedestrian traffic, it is very important to determine the seismic behaviour of the bridge considering the possible earthquakes to which the structure will be exposed. This article presents the seismic response of the historical Yilanli(Leylekli) Bridge, which has been subjected to unfavourable human-made changes in geometric shape over time. The original and modified shapes of the bridge were modelled using the macro modelling approach in ANSYS finite element software. The structural performance of the models was evaluated in terms of stresses, deformations, and especially cracks on the arch and spandrel walls using nonlinear static and time history analyses. The results of the analysis show that the change in shape, which is not desirable from an architectural and aesthetic point of view, adversely affects the seismic performance of the historical bridge and makes it more vulnerable to possible earthquakes. In addition, the analyses clearly showed that both models are subject to serious structural damage that could lead to a collapse in the event of a potential large magnitude earthquake.Publication Effects of shrinkage reducing admixture and polypropylene fiber utilization on some fresh state, mechanical and durability properties of khorasan mortar(Taylor & Francis Inc, 2022-07-16) Özen, Süleyman; İsafca-Kaya, Tuğce; Karakuzu, Kemal; Mardani, Ali; MARDANİ, ALİ; Doğangün, Adem; DOĞANGÜN, ADEM; Mühendislik Fakültesi; İnşaat Mühendisliği Bölümü; 0000-0002-1023-3962; 0000-0001-5522-427X; 0000-0003-0326-5015; 0000-0002-1867-7103; AAR-6126-2020; C-7860-2015; AAJ-6415-2021This study aimed to improve the mechanical and durability properties of Khorasan mortar, a type of lime-based mortar, using polypropylene shrinkage reducing admixture (SRA) and fiber. In addition to the control mixture without fiber and chemical admixture, three series of mixtures were prepared. The first series contains 0.4-0.6-0.8% polypropylene fiber by total volume; the second series contains SRA at the 0.05-0.1-0.15% by binder weight; the third series consists of mixtures containing both fiber and the SRA. Within the scope of the study, some fresh state, mechanical and durability properties were determined. The results show that utilization of fiber and SRA reduced the length change depending on drying-shrinkage and mass loss due to abrasion compared to the control mixture. In addition, the 90-day flexural and compressive strength values for all mixtures were lower than the 28-day results. It was determined that the decrease in strength values is less than the control mixture with the utilization of fiber and SRA because of the degradation in drying-shrinkage.Publication Effects of material properties on the mechanical and durability behaviors of khorasan mortar mixtures: A review(Taylor, 2021-03-05) İsafça, Tuğçe; Karakuzu, Kemal; Özen, Süleyman; Doğangün, Adem; Mardani-Aghabaglou, Ali; İsafça, Tuğçe; Karakuzu, Kemal; DOĞANGÜN, ADEM; MARDANİ, ALİ; Mühendislik Fakültesi; İnşaat Mühendisliği Bölümü; 0000-0002-9331-1339; 0000-0002-1023-3962; 0000-0002-1867-7103; 0000-0003-0326-5015; AAR-6126-2020; C-7860-2015; GBH-3020-2022; GFM-1667-2022Historical buildings are an important piece of our cultural heritage. It is important that the materials used in the preservation, repair and reinforcement applications of these structures should be compatible with the existing structure. In many of the historical buildings in Turkey, it was reported use of the Khorasan mortar as the masonry mortar and plaster. Khorasan mortar contains slaked lime as a binder, river sand, and clayey materials as aggregate, which are fired at high temperature. It was emphasized that this mortar is an essential building material widely used in the construction and repair of historical buildings from past to present. In this study, the effects of binder, aggregate, chemical admixture, organic admixture, and fiber properties on the mechanical and durability performance of Khorasan mortar and lime-based mortar mixtures were investigated. For this purpose, a comprehensive literature research was carried out on this subject. In addition, the positive and negative effects of these materials on the mortar mixture were emphasized.