Operational modal analysis of the hagia sophia bell-tower
3rd International Operational Modal Analysis Conference, IOMAC 2009, Portonovo, İtalya, 4 - 06 Mayıs 2009, ss.491-498, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Basıldığı Şehir: Portonovo
- Basıldığı Ülke: İtalya
- Sayfa Sayıları: ss.491-498
- Karadeniz Teknik Üniversitesi Adresli: Evet
Özet
Many of historical structures have degenerated in time by environmental effects because of the inadequate preservation. Protective measures can be supplied if the actual behaviour of these structures is known. The ambient vibration test has been preferred in many applications to determine actual dynamic parameters of structures. The paper presents the ambient vibration tests of the Hagia Sophia bell-tower. The experimental measurements are done by using uni-axial accelerometers. Six vibration modes of the tower are identified within the frequency range 2-9Hz. Because the tower has an approximately square shape, first and second bending modes have near frequency values. The first natural frequency of the tower is calculated using an equation given in literature for this type of structures. Comparing the experimental and calculated frequency value, they are different because of some degeneration on the walls of the tower. The study clearly indicates that the experimental measurements on historical structures by ambient vibration test provide us invaluable data. The changes in the dynamic behaviour of historical structures can be followed by this way and protective measurement can be supplied.