Experimental study on the seismic enhancement of brick masonry spandrels using a single-sided composite reinforced mortar coating

Gams, Matija (author), Boem, Ingrid (author), Gattesco, Natalino (author), Rizzi, Emanuele (author), Dudine, Allen (author)

The paper reports on four cyclic tests of brick masonry spandrels in reference state and strengthened state. The tests were carried out on full-scale, H-shaped masonry panels to investigate the coupling role of the spandrel in connecting two piers in a historical masonry wall subjected to in-plane lateral actions. Two 250-mm-thick solid-brick masonry samples were tested—one single-leaf, the other two-leaves masonry. Both samples were tested before and after strengthening by applying a Composite Reinforced Mortar (CRM) coating on one surface. The CRM coating consisted of a lime mortar coating (nominal thickness = 30 mm), reinforced with mesh made of Glass Fibre-Reinforced Polymer (GFRP) that was anchored to the wall by GFRP transverse connectors. For the double-leaf masonry, there were additional transverse connectors made of steel bars in concrete cores (artificial diatones) to prevent masonry leaves separation and to improve the bonding of the CRM coating to the masonry. The test responses are compared in terms of crack pattern, failure mode, resistance, displacement and energy dissipation capacity. The tests showed the effectiveness of the proposed CRM system, which increased the spandrel resistance by 33% and 125% in the single—and double-leaf masonry, respectively, with the ultimate drift being 3.2% (one order of magnitude greater than for the unstrengthened reference samples). Data on energy dissipation and the equivalent viscous damping are also collected and compared. Importantly, the presence of the reinforcing mesh and the composite action of the coating and the wall changed the damage evolution and response mechanism, which resulted in a much better seismic response.

• Language: English
• Keywords: civil engineering, masonry spandrels, structural strengthening, single-leaf brick masonry, double-leaf brick masonry, textile reinforced mortar, composite reinforced mortar
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publication status: Published
• Publication version: Author Accepted Manuscript
• Year: 2024
• Number of pages: 22 str.
• Numbering: Letn. XX, št. feb.
• PID: 20.500.12556/RUL-154596
• UDC: 624.042.7
• ISSN on article: 1570-761X
• DOI: 10.1007/s10518-024-01868-2
• COBISS.SI-ID: 186484227
• Publication date in RUL: 22.02.2024

Record is a part of a journal

• Title: Bulletin of earthquake engineering
• Publisher: Springer Nature, European Association for Earthquake Engineering
• ISSN: 1570-761X
• COBISS.SI-ID: 897639

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

• Language: Slovenian
• Title: Eksperimentalna študija potresnega utrjevanja opečnih prekladnih zidov z enostranskimi oblogami
• Keywords: gradbeništvo, prekladni zid, potresno utrjevanje, enoslojni opečni zid, dvoslojni opečni zid, armirani omet, kompozitni materiali