Existing masonry buildings often exhibit a brittle behavior during seismic events due to the reduced in-plane shear capacity of piers. Inorganic composite materials are widely used for the seismic upgrading of masonry walls capacity, thanks to the good breathability and compatibility with the substrate. This work presents the results of an experimental program carried out on 17 limestone masonry panels with irregular texture typical of L’Aquila area and tested under diagonal compression. Three panels were used as control specimens; the remaining panels were strengthened with Fiber Reinforced Cement Mortar (FRCM) with anchors and two different lime-based mortars, one cement-free and one with a small cement content ratio, and coupled with two different grids (GFRP grid 40 × 40 mm and BFRP grid 6 × 6 mm). Single-sided and double-sided strengthening configurations were adopted, to investigate the reduction in strengthening effectiveness in the case of single-sided applications. The results showed that the FRCM system allowed a capacity increase by 65% in single-sided configuration and 140% in double-sided configuration. The matrix cement-content did not affect significantly the results. Conversely, the use of the BFRP grid, characterized by a 6 mm spacing, promoted the development of premature delamination problems.
FRCM for the in-plane shear strengthening of masonry panels with irregular texture / DEL ZOPPO, Marta; Maddaloni, Gennaro; DI LUDOVICO, Marco; Balsamo, Alberto; Prota, Andrea. - (2019), pp. 2653-2659. (Intervento presentato al convegno L'Ingegneria Sismica in Italia tenutosi a Ascoli Piceno nel 15-19 settembre 2019).
FRCM for the in-plane shear strengthening of masonry panels with irregular texture
DEL ZOPPO, MARTA;Gennaro Maddaloni;Marco Di Ludovico;Alberto Balsamo;Andrea Prota
2019
Abstract
Existing masonry buildings often exhibit a brittle behavior during seismic events due to the reduced in-plane shear capacity of piers. Inorganic composite materials are widely used for the seismic upgrading of masonry walls capacity, thanks to the good breathability and compatibility with the substrate. This work presents the results of an experimental program carried out on 17 limestone masonry panels with irregular texture typical of L’Aquila area and tested under diagonal compression. Three panels were used as control specimens; the remaining panels were strengthened with Fiber Reinforced Cement Mortar (FRCM) with anchors and two different lime-based mortars, one cement-free and one with a small cement content ratio, and coupled with two different grids (GFRP grid 40 × 40 mm and BFRP grid 6 × 6 mm). Single-sided and double-sided strengthening configurations were adopted, to investigate the reduction in strengthening effectiveness in the case of single-sided applications. The results showed that the FRCM system allowed a capacity increase by 65% in single-sided configuration and 140% in double-sided configuration. The matrix cement-content did not affect significantly the results. Conversely, the use of the BFRP grid, characterized by a 6 mm spacing, promoted the development of premature delamination problems.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.