Numerical Analysis of a Reduced-Scale RC Structure Reinforced by an Aluminum Alloy-Timber Exoskeleton

This research investigates an integrated retrofitting approach designed to improve the structural safety, energy efficiency, and functionality of existing buildings, with a strong emphasis on eco-sustainability. The focus is on outdated reinforced concrete (RC) structures that currently demonstrate inadequate seismic performance and poor energy efficiency. The study explores the implementation of an innovative exoskeleton system, which serves as an external envelope aimed at enhancing both seismic behaviour and energy efficiency. Various configurations of the exoskeleton are considered, featuring a glued timber frame connected to the existing RC structure via steel elements. The seismic-resistant component can be constructed using either shear walls or X-bracing systems, both made from aluminium alloys. Additionally, cork panels are incorporated for thermal insulation. Numerical analyses are conducted on a reduced-scale RC structure reinforced with the proposed exoskeleton system to identify the most effective configuration for future laboratory testing. Seismic evaluations, including modal and nonlinear analyses, are performed to compare the upgrading performance of the retrofitted structure against that of the unreinforced original. Energy performance is assessed through thermophysical parameters. The results reveal significant advantages, underscoring the effectiveness of the integrated rehabilitation intervention presented in this study.