Journal
INTERNATIONAL JOURNAL OF ARCHITECTURAL HERITAGE
Volume 15, Issue 10, Pages 1375-1394Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/15583058.2019.1675803
Keywords
Diagonal compression tests; FRCM strengthening system; grout injection; shear behavior; stone masonry
Funding
- Italian Department of Civil Protection
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The study evaluated the improvement in shear behavior of stone masonry elements through different strengthening procedures. Experimental testing and non-destructive sonic tests were used to determine the efficiency of the grout injection, showing a good correlation with the shear capacity of the retrofitted samples. The presence of reinforcing fibers mainly influenced the post-peak behavior and resulted in a more ductile failure mode.
Existing stone masonry buildings, constituting a significant portion of historical city centers, suffered often severe damages during seismic events. Traditional and innovative strengthening techniques can be applied to restore or enhance the structural capacity of these construction typologies. The objective of the present work was to evaluate the improvement given by different strengthening procedures to the shear behavior of stone masonry elements. In particular, an experimental campaign on stone masonry samples was carried out, in which the specimens were strengthened through different Fiber Reinforced Cementitious Matrix (FRCM) systems and grout injection. Non-destructive sonic tests were performed before and after the strengthening procedure to determine the efficiency of the grout injection. Then, the samples were subject to diagonal compression test with the objective of evaluating the influence of the different FRCM strengthening systems on the shear behavior, in terms of stiffness, load bearing capacity and failure mode. Comparisons between experimental results showed, on the one hand, a good correlation between the quality of the grout injection, analyzed through sonic tests, and the shear capacity of the retrofitted samples. On the other hand, the presence of the reinforcing fibers influenced mainly the post-peak behavior and determined a more ductile failure mode.
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