Progressive Damage Analyses of Masonry Buildings by Dynamic Analyses
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RESEARCH PAPER
Progressive Damage Analyses of Masonry Buildings by Dynamic Analyses Fuat Aras1
•
Tolga Akbas¸2 • Hızır Eks¸i3 • Seyit Çeribas¸ı2
Received: 31 July 2019 / Revised: 4 March 2020 / Accepted: 6 April 2020 Ó Iran University of Science and Technology 2020
Abstract This study investigates the effects of prescribed damage on the walls of masonry buildings by experimental and numerical methods. Ambient vibration survey method was applied to an existing, two-story, unreinforced masonry building to determine its dynamic characteristics, such as mode shapes and natural frequencies. Then, the walls on two exterior sides of the building were demolished, and dynamic testing was repeated for the damaged building. As the next step, the amount of damage on the building was increased by more impacts, and the dynamic characteristics of the heavily damaged building were identified. The results obtained from the undamaged, damaged and heavily damaged building were compared, and the damage effect on the natural frequencies of the building was noted. Besides, finite element analyses of the undamaged, damaged and heavily damaged buildings were performed. It was found that, the numerical models, constructed with codebased material properties, do not sufficiently represent the dynamic behavior of masonry buildings. Secondly, as the result of the sustained damage, while the experimental and the numerical modal analyses revealed the decrease in the dominant frequencies of the building, the difference between them increases with the severity of the damage. With the framework presented in this study, the behavior of masonry buildings can better be determined and used for analysis purposes. Keywords Vibration survey Masonry Full-scale test Numerical model Identification
1 Introduction In terms of structural stability, masonry buildings are a class of buildings vulnerable to external actions, such as seismic events, blast effects and direct force impacts. Past & Fuat Aras [email protected]; [email protected] Tolga Akbas¸ [email protected] Hızır Eks¸ i [email protected] Seyit C¸eribas¸ ı [email protected] 1
Civil Engineering Department, Istanbul Medeniyet ¨ nalan mahallesi, F Blok, No: University, Kuzey Yerles¸ kesi, U ¨ sku¨dar, ˙Istanbul, Turkey 133, 34732 U
2
Civil Engineering Department, Maltepe University, ˙Istanbul, Turkey
3
Civil Engineering Department, Is¸ ık University, ˙Istanbul, Turkey
earthquakes have given the chance of observing the behavior of masonry buildings under various levels of seismic action. Moreover, masonry walls have been realistically studied with experimental and numerical techniques under blast and impact effects. Recent studies reported substantial damage cases of masonry buildings subjected to low level of ground shakings [1–5]. These damage types have been classified as vertical corner cracks, diagonal tension cracks, sliding, toe crashing, rocking, out-of-plane cracks and horizontal cracks on the vi
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