The effectiveness of reinforced plasters and Composite Reinforced Mortars (CRM) for increasing the in-plane shear capacity of masonry walls was investigated on a series of 32 single-leaf tuff masonry panels subjected to diagonal compression tests. Six specimens were used as control and two specimens were strengthened with reinforced plaster (steel grid 100 × 100 mm and cementitious matrix) with a thickness of 40 mm. The remaining specimens were strengthened with two different fibre reinforced lime-based mortars, characterized by different cement content ratios, and coupled with three different grids (steel grid 100 × 100 mm, GFRP grid 30 × 30 mm and GFRP grid 40 × 40 mm). Both single-sided and double-sided strengthening configurations were adopted for all strengthening solutions, to investigate the reduction in strengthening effectiveness in case of single-sided applications. The results showed that strengthening in single-sided configuration increased the shear capacity from 42% to 85% with respect to the unreinforced masonry panels (URM) average shear capacity. Conversely, strengthening in double-sided configuration led to a shear capacity increase from 138% up to 288%. Based on experimental results, reducing the matrix cement content ratios in strengthened system led to a reduction in shear capacity and energy dissipation, independently from the grid properties. Furthermore, specimens strengthened with GFRP 40 × 40 grid, although characterized by a large spacing with respect to GFRP 30 × 30, achieved an increase in the shear capacity and energy dissipation greater than other strengthened specimens clearly evidencing that the grid spacing and the interlock between grid and micro-fibres embedded in the mortar are crucial aspects for the strengthening system effectiveness.
In-plane shear capacity of tuff masonry walls with traditional and innovative Composite Reinforced Mortars (CRM) / Del Zoppo, M.; Di Ludovico, M.; Balsamo, A.; Prota, A.. - In: CONSTRUCTION AND BUILDING MATERIALS. - ISSN 0950-0618. - 210:(2019), pp. 289-300. [10.1016/j.conbuildmat.2019.03.133]
In-plane shear capacity of tuff masonry walls with traditional and innovative Composite Reinforced Mortars (CRM)
Del Zoppo M.;Di Ludovico M.;Balsamo A.;Prota A.
2019
Abstract
The effectiveness of reinforced plasters and Composite Reinforced Mortars (CRM) for increasing the in-plane shear capacity of masonry walls was investigated on a series of 32 single-leaf tuff masonry panels subjected to diagonal compression tests. Six specimens were used as control and two specimens were strengthened with reinforced plaster (steel grid 100 × 100 mm and cementitious matrix) with a thickness of 40 mm. The remaining specimens were strengthened with two different fibre reinforced lime-based mortars, characterized by different cement content ratios, and coupled with three different grids (steel grid 100 × 100 mm, GFRP grid 30 × 30 mm and GFRP grid 40 × 40 mm). Both single-sided and double-sided strengthening configurations were adopted for all strengthening solutions, to investigate the reduction in strengthening effectiveness in case of single-sided applications. The results showed that strengthening in single-sided configuration increased the shear capacity from 42% to 85% with respect to the unreinforced masonry panels (URM) average shear capacity. Conversely, strengthening in double-sided configuration led to a shear capacity increase from 138% up to 288%. Based on experimental results, reducing the matrix cement content ratios in strengthened system led to a reduction in shear capacity and energy dissipation, independently from the grid properties. Furthermore, specimens strengthened with GFRP 40 × 40 grid, although characterized by a large spacing with respect to GFRP 30 × 30, achieved an increase in the shear capacity and energy dissipation greater than other strengthened specimens clearly evidencing that the grid spacing and the interlock between grid and micro-fibres embedded in the mortar are crucial aspects for the strengthening system effectiveness.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
