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The effectiveness of a method to strengthen/repair unreinforced masonry (URM) by using timber-based products was investigated through experimental in situ testing. The strategy consists of timber-based panels connected to the masonry by means of screw fasteners. URM piers obtained from a century-old building were subjected to in-plane semi-cyclic quasi-static loading in as-built, repaired and retrofitted configurations. The application of the reinforcement on previously damaged piers led to a notable increase in the in-plane capacity while the initial stiffness of the repaired specimens was found to be consistent with that of the specimens tested as-built. When applied to undamaged masonry, the retrofit system allowed an in-plane force 40% higher than the capacity of the unreinforced walls, with the initial stiffness comparable with that of the repaired specimens. Both repaired and retrofitted specimens exhibited remarkable displacement capacity (drift levels > 2.0%) and energy dissipation.

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The paper presents the outcomes of an experimental campaign investigating the in-plane behavior of stone masonry walls reinforced with crosslaminated timber (CLT ) panels fixed to the masonry by using steel rods and adhesives. Timber panels are intended to be positioned only on the internal side of the building walls, to preserve the integrity of the external façades and for better durability. The campaign is part of a broader project that already saw testing (from connections to full-scale walls) of clay brick masonry strengthened with timber panels fixed to the masonry by using screw fasteners inserted dry. The research phase presented herein comprised 1) shear testing of timber-masonry connections fixed with epoxy-based resins and 2) in-plane diagonal compression testing of as-built and retrofitted masonry wallets to evaluate the shear capacity of the walls with and without the strengthening.