Sürdürülebilir Kalkınma Amaçları
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- MakaleAçık Erişim2025Scopus SJRQ3Erzurum Central Cortan Mosque and 2020-2021 Restoration
Çelik, Bayram; Gültepe, Gulten
The city of Erzurum has always maintained its feature of being one of the most important cities of the region in terms of military, trade and culture and art throughout history. Being geographically at the junction of important civilizations and being at the transition point of these civilizations has not only preserved this feature but also caused its cultural and artistic richness to be very diverse and of high standards. The city, which was the gateway to Anatolia for the Turks, was also the city where the first Turkish architectural works were built. Structures such as the Ulu Mosque, the Twin Minarets and the Yakutiye Madrasahs not only raised the building standards of the architectural tradition in this city to a very high level, but also became a reference for later structures in terms of building standards. The high building standards that began with the Saltukids and Ilkhanids gained new momentum in the 16th century. After this transformation, very large foundations were established in the city and intensive construction activities began. Many valuable structures were added to the city in the construction activities that continued uninterruptedly until the Republic period. One of these is the & Ccedil;ortan Mosque, which is thought to have been built in the 1850s. The mosque with wooden pillars and wooden beams is a structure that greatly reflects the architectural tradition of Erzurum and the characteristics of the period in which it was built. With this study, both the cultural and artistic characteristics of the structure will be determined and brought to the literature, and the restoration conveyed in detail.
AtıfWoS1
İncele - MakaleYalnız künye2024Scopus SJRQ1Evaluation of the seismic performance pre- and post-restoration of a masonry clock tower's FE model updated via experimental and optimization methods
Ergün, Mustafa; Tayfur, Bilal
This article presents comprehensive numerical and partial experimental studies to determine the seismic performance of the recently restored masonry clock tower in Bayburt before and after restoration. The numerical dynamic characteristics of the structure are obtained by free vibration analysis conducted on the preliminary finite element model, while the experimental ones are determined through ambient vibration testing. The ultimate finite element models reflecting the actual state of the structure pre- and post-restoration are created through a model updating process based on the principle of minimizing the differences between numerical and experimental dynamic properties via the Tabu Search Algorithm. Dynamic analyses of the models are carried out by the mode superposition method in the time domain, using eleven earthquake ground motion records selected considering the tectonic structure of the region and scaled to the design spectrum explicitly established to the site. Seismic responses are evaluated based on displacement, maximum-minimum principal stress, and maximum-minimum principal strain. The maximum principal stress value, the most critical parameter jeopardizing the safety of masonry structures, is 2.069 MPa before the restoration reaches 2.489 MPa, with an increase of approximately 20.3 % after the restoration. Since this value is less than the tensile strength of the masonry material, 3.120 MPa, it is not at a level that poses any risk to the structure. Other structural reactions also remain below the limit values. Therefore, according to today's seismic hazard analysis criteria, it can be said that the clock tower is safe. However, the North Anatolian Fault Zone, with high tectonic activity passing just south of the city, has the potential to produce severe earthquakes that may affect the region in the future. Therefore, it is necessary to periodically monitor the seismic behaviors of the historical masonry structures in Bayburt and take essential precautions based on the results.
AtıfScopus12WoS11OpenAlex13
İncele - MakaleYalnız künye2024Scopus SJRQ1Variations of natural frequencies of masonry minarets due to environmental effects
Yanik, Yusuf; Aymelek, Abdullah; Yildirim, Ömer; Demirtaş, Betül; Türker, Temel
It is very important to distinguish the reason of change in natural frequencies of structures either caused by a possible damage or environmental conditions (temperature and humidity). In this study, the changes in the dynamic properties of masonry and reinforced concrete minarets under environmental effects, such as temperature and humidity, were investigated. The masonry minarets of İskenderpaşa, Hacı Kasım, and Tavanlı Mosques and the reinforced concrete minarets of Karadeniz Technical University, Dilaveroğlu and Papatya Mosques in Trabzon were monitored by ambient vibration test method, and the relationship between natural frequencies and temperature and humidity was tried to be determined. For this purpose, the natural frequencies of these minarets were measured at certain intervals under different temperature and humidity conditions over a period of approximately 6 months. The vibration measurement system which was developed by our research team was used in the measurements. From the data collected by these measurements, the variation intervals of the natural frequencies (the smallest and the highest values), the percentages of change and their relations with temperature and humidity were revealed. This relationship was determined using linear–non-linear simple and multiple regression analyses. From this study, it was found that the natural frequencies change under environmental effects, such as temperature and humidity, and this rate of change was approximately 7%. There was moderate correlation in Tavanlı, Dilaveroğlu, and Papatya Minarets, and strong correlation in Hacı Kasım Minaret.
AtıfScopus16WoS17OpenAlex16İncele