Diagonal compression testing of masonry panels with irregular texture strengthened with inorganic composites
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ORIGINAL ARTICLE
Diagonal compression testing of masonry panels with irregular texture strengthened with inorganic composites Marta Del Zoppo
. Marco Di Ludovico . Alberto Balsamo . Andrea Prota
Received: 6 March 2020 / Accepted: 23 July 2020 The Author(s) 2020
Abstract Inorganic composites for enhancing the in-plane shear capacity of masonry walls with irregular texture were investigated on twenty-one panels under diagonal compression tests. Three specimens were used as control and twelve specimens were strengthened with two Fibre Reinforced Mortars (FRM-A and FRM-B), characterized by a different content of fibres embedded in the lime-based matrix. The remaining six specimens were strengthened with Fabric Reinforced Cementitious Mortars (FRCM), consisting in a GFRP grid embedded in a fibre reinforced matrix (the same used for FRM-A). The influence of single-side and double-side strengthening configurations on the capacity of strengthened panels was also investigated, to point out the reduction in strengthening effectiveness in case of single-sided applications. The results showed that all the inorganic composites adopted for the strengthening techniques provided a substantial increase of shear capacity. The grid in FRCM strengthened panels played an important role in both strength and deformation capacity at peak. The different fibres content (lower than 50% in weight) in FRM systems slightly affected the overall performance of panels. Finally, analytical predictions
M. Del Zoppo (&) M. Di Ludovico A. Balsamo A. Prota Department of Structures for Engineering and Architecture, University of Naples Federico II, Naples, Italy e-mail: [email protected]
of experimental results were reported and discussed and a preliminary analytical model for estimating the FRM shear contribution was proposed, obtaining a good agreement with test results. Keywords FRCM FRM TRM Masonry with irregular texture In-plane shear strengthening
1 Introduction Existing masonry buildings in seismic areas are particularly vulnerable to heavy damage due to the reduced in-plane shear capacity of piers [1]. This problem is even more evident in the case of poor quality masonry walls with a lack of transverse connections or with an irregular texture (i.e. uncoursed) [2]. Indeed, it is recognized that the mechanical behaviour of masonry walls with irregular texture is generally poor as shear cracking may easily occur only in the mortar joints, not involving the stone blocks [3]. Recently, the use of inorganic composites has been largely investigated for improving the in-plane shear capacity of masonry panels, due to their higher compatibility with the masonry substrate and their suitability with a life-cycle design of retrofit interventions. Among the inorganic composite materials, three main classes can be identified: Fibre/Fabric
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Reinforced Cementitious Mortar (FRCM, also known as Textile Reinforced Mortar or TRM), Composite Reinforced Mortar (CRM) [4], and
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