Full-scale cyclic shear-compression testing of stone masonry retrofitted with CRM and FRM: The ERIES-RESTORING project

This paper presents the outcomes of the ERIES-RESTORING project, a collaborative transnational experimental campaign aimed at improving the seismic performance of undressed stone masonry structures using Composite Reinforced Mortars (CRM) and Fiber Reinforced Mortars (FRM). Despite increasing interest in mortar-based jacketing systems, their application to irregular stone masonry elements lacks experimental validation and codified design procedures. To address this gap, a comprehensive program of structural and material testing was conducted. Structural behavior was assessed through seven full-scale quasi-static cyclic shear-compression tests on masonry piers with two aspect ratios, designed to induce shear and flexural failure modes, respectively. Four strengthening configurations were investigated: unreinforced masonry, CRM applied to one or two faces, and FRM applied to two faces. Mechanical characterization included companion vertical and diagonal compression tests on masonry wallettes and bending and compression tests on mortar prisms. Results demonstrate significant improvements in lateral load and ultimate displacement capacity, as well as in compressive and tensile strength of the jacketed masonry. Retrofitted specimens displayed more distributed cracking and delayed failure, highlighting enhanced damage tolerance. An open-access dataset ( https://doi.org/10.60756/euc-vbua48i530 ) accompanies this study, providing full time-series measurements, instrumentation layouts, and imagery suitable for Digital Image Correlation to support future analytical and numerical modeling. These findings provide experimental evidence to inform design methodologies and code formulations and to support the adoption of CRM and FRM systems for seismic rehabilitation of stone masonry heritage buildings.