Modal identification of infill masonry walls with different characteristics

• Type: Article in International Scientific Journal
• Date: 2017-08-15

Authors

André Furtado (Author) FEUP; Hugo Rodrigues (Author) Other; António Arêde (Author) FEUP; Humberto Varum (Author) FEUP

Journal

Title: Engineering Structures

Vol. 145

Pages: 118-134

ISSN: 0141-0296

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 9 Citations

ISI Web of Science

Scopus - 13 Citations

Scientific classification

CORDIS: Technological sciences ; Technological sciences > Engineering > Civil engineering > Structural engineering

FOS: Engineering and technology > Civil engineering

Associated Projects

ASPASSI - Avaliação da segurança e reforço de paredes de alvenaria de enchimento para solicitações sísmicas

Other information

Authenticus ID: P-00M-SMT

DOI: 10.1016/j.engstruct.2017.05.003

Abstract (EN): 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 contribution 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 mechanisms were observed, in particular the infills' out-of-plane (OOP) collapse that can have important consequences 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 corresponding vibration modes. For this, two different campaigns were carried out: i) in-situ tests were carried 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) laboratory 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 corresponding vibration modes. From the results, it was observed that the openings reduced the OOP frequencies around 20-40%, the axial load increment in the adjacent columns increased the OOP stiffness and consequently the natural frequencies of the panel.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 17