Longobardi, Giovanna (2025) Aluminium alloy systems for integrated seismic-energy retrofitting of existing masonry buildings. [Tesi di dottorato]

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Abstract

In Italy, as in many other European countries, a significant portion of the existing building stock consists of unreinforced masonry structures, commonly arranged in clusters, typical of small historic centres. Built before modern seismic codes, these constructions are highly vulnerable to horizontal actions, as recent earthquakes have highlighted. Besides structural issues, these buildings also exhibit energy inefficiencies due to low-quality materials as well as the widespread presence of thermal bridges. To address this, recent European directives, aimed at reducing CO₂ emissions from the building sector—which accounts for over 30% of total emissions—promote energy retrofitting of existing buildings as a key measure to reduce consumption and waste. In this context, an integrated approach capable of simultaneously improving seismic and energy performance emerges as an effective and sustainable solution. Based on these premises, the PhD thesis investigates the MIL15.s system, patented by the Italian company TM Group S.r.l., for the integrated seismic-energy retrofitting of existing masonry structures. The technique combines a base-frame exoskeleton made of extruded aluminium alloy elements, designed to absorb seismic loads, with insulating sandwich panels capable of reducing thermal losses. The system’s effectiveness was assessed through an experimental campaign on full-scale elements, and the results were subsequently validated by carrying out numerical simulations using the finite element software ABAQUS CAE. The integrated solution was then evaluated on various aggregates located in medium-to-high seismic risk areas with different plan configurations and a heterogeneous distribution of structural units. The findings showed a notable increase in the seismic safety index, along with enhanced strength, stiffness, and ductility, accompanied by a marked reduction in thermal dispersion due to lower envelope transmittance. The benefits and the results from both experimental and numerical phases confirm the strong potential of the MIL15.s system, a lightweight, innovative, minimally invasive, and sustainable solution for integrated seismic-energy retrofitting of existing masonry buildings, both in isolated and aggregate configurations.

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