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Publication
Modal identification of infill masonry walls with different characteristics
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Advisor(s)
Abstract(s)
A significant number of structural damages observed in reinforced concrete (RC) structures that occurred in regions affected by earthquakes are due to the presence of the infill masonry walls (IMW). Survey of the structural damages caused by earthquakes reported that the infills panels had an important contri bution in the seismic response of the buildings, namely through the modification of the natural period of the structure due to the increase of the structural lateral stiffness provided. Different failure mecha nisms were observed, in particular the infills’ out-of-plane (OOP) collapse that can have important con sequences for the structure and for the human life’s. The infills’ OOP seismic performance depends on different variables such as the wall geometry, existence of openings, boundary conditions, slenderness
and existence of previous damage. This manuscript presents an experimental study of ambient vibration tests on IMW with the main goal of characterize the dynamic properties such as the in-plane and OOP frequencies of the panel and the cor responding vibration modes. For this, two different campaigns were carried out: i) in-situ tests were car ried out in IMW of three infilled RC structures with aim of capture the OOP frequencies and vibration modes of infill panels with different characteristics and evaluate the influence of each variable; ii) labo ratory tests were carried out on a full-scale infilled RC frame in order to evaluate the natural frequencies evolution along the period after construction. Additionally, it was evaluated the effect of the axial load in the adjacent RC columns and also the existence of damage on the IMW natural frequencies and corre sponding vibration modes. From the results, it was observed that the openings reduced the OOP frequen cies around 20–40%, the axial load increment in the adjacent columns increased the OOP stiffness and consequently the natural frequencies of the panel.
Description
Keywords
Infill masonry walls Out-of-plane Modal identification Ambient vibration tests
Citation
André Furtado, Hugo Rodrigues, António Arêde, Humberto Varum, Modal identification of infill masonry walls with different characteristics, Engineering Structures, Volume 145, 2017, Pages 118-134, ISSN 0141-0296, https://doi.org/10.1016/j.engstruct.2017.05.003.
Publisher
Elsevier BV
Collections
CC License
Without CC licence