Shake table tests on a tuff masonry structure strengthened with composite reinforced mortar

•Shake table tests were performed on a real-scale structure strengthened with CRM.•Strengthening was designed based on structural features and damage state.•Acceleration and displacement capacity were significantly enhanced.•Strengthening was applied to the outer wall surface to minimize inconvenien...

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Bibliographic Details
Published in:Composite structures 2021-11, Vol.275, p.114508, Article 114508
Main Authors: De Santis, Stefano, de Felice, Gianmarco
Format: Article
Language:English
Subjects:
3D vision
Experimental modal analysis
GFRP mesh
Mortar-based composites
Shake table test
Textile reinforced mortar
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Summary:•Shake table tests were performed on a real-scale structure strengthened with CRM.•Strengthening was designed based on structural features and damage state.•Acceleration and displacement capacity were significantly enhanced.•Strengthening was applied to the outer wall surface to minimize inconvenience on occupants.•CRM requires fast installation, includes durable materials and is 30 mm thick. The seismic vulnerability of unreinforced masonry structures threatens the life and health of people and the conservation of the built heritage in earthquake prone areas, highlighting the need of gaining a deeper understanding of their dynamic behaviour and of developing appropriate strengthening technologies. This work investigates the effectiveness of a low-impact technology consisting of composite reinforced mortar (CRM) applied to the outer surface of masonry walls for enhancing their seismic capacity, without the need to evacuate the building. Shake table tests were performed under natural accelerograms (applied in horizontal and vertical directions) on a real-scale structure, built with tuff blocks and consisting of a façade with a window, two side walls (one of which with a door near the corner) and an inclined timber roof. The mock-up was tested unstrengthened, then repaired and strengthened by applying a glass fibre reinforced polymer mesh embedded in a lime-based plaster to the outer surface of damaged walls. The experimental investigation showed the effects of CRM on damage accumulation, failure mode and on the increase of base acceleration and displacement capacities.
ISSN:0263-8223
1879-1085
DOI:10.1016/j.compstruct.2021.114508