The ERIES_RESUME Project: Results of Experimental Activities

This paper presents the outcomes of an extensive experimental investigation on the seismic performance of an innovative exoskeleton retrofitting system, developed as part of the ERIES-RESUME project. The proposed system integrates laminated timber and aluminium components to enhance both structural resilience and energy efficiency of existing reinforced concrete (RC) buildings. Two identical 1:3 scale RC models, representing typical non-ductile structures, were tested on a shaking table at the IZIIS Laboratory in Skopje. The first model, initially unstrengthened, was subjected to seismic loads until moderate damage was induced. Following appropriate repairs, the exoskeleton was applied and the model was retested. The second model was equipped with the exoskeleton from the outset. Test results demonstrate significant improvements in seismic performance, including increased stiffness, energy dissipation, and reduced infill wall damage. The study confirms the feasibility and effectiveness of the exoskeleton system as a practical solution for retrofitting vulnerable RC buildings.