Nested Buildings: An Innovative Strategy for the Integrated Seismic and Energy Retrofit of Existing Masonry Buildings with CLT Panels

The Italian building heritage is aged and inadequate to the high-performance levels required nowadays in terms of energy efficiency seismic response. Innovative techniques are generating a strong interest, especially multi-level approaches solution optimizations. Among these, Nested Buildings, an integrated intervention approach which preserves external existing structure provides new structural system inside, aim at improving both performances. research presented hereinafter focuses on strengthening unreinforced masonry (URM) buildings with cross-laminated timber (CLT) panels, thanks their lightweight, high stiffness, good hygrothermal characteristics. improvement performance was investigated through 2D-model analyzed dynamic regime, showed general decreasing overall thermal transmittance for retrofitted configurations. Then, evaluate behavior coupled system, parametric linear static analysis implemented in-plane out-of-plane directions, considering various types connector spacings. Results improve response walls, thus validating possible applications URM buildings, where local overturning mechanisms prevented by either sufficient construction details or specific solutions.