PERFORMANCE-SPECTRA DESIGN OF DISSIPATIVE EXOSKELETONS FOR SEISMIC RETROFIT OF RC BUILDING STRUCTURES

The Performance-Spectra (P-Spectra) method is an effective tool for designing dissipative seismic retrofit systems, allowing precise control of structural performance and response under seismic loads. Originally developed for structures with hysteretic, viscous, and viscoelastic dampers, the P-Spectra approach also adapts to various damping systems, simplifying the process of achieving target performance levels without repeated calculations. This paper explores the application of P-Spectra to the design of dissipative exoskeletons as a seismic retrofit for reinforced concrete (RC) buildings. By aligning the response characteristics of a multi-degree-of-freedom (MDOF) system with an equivalent single-degree-of-freedom (SDOF) model, the method enables direct control over peak displacements, base shear, and acceleration to meet seismic stability and energy dissipation criteria. Dissipative exoskeletons, an emerging retrofit solution, offer a rapid, low-impact, and reversible approach that can be implemented while buildings remain operational - critical for public structures like schools, offices, and cultural sites. This study applies the P-Spectra-based retrofit design to dissipative exoskeletons applied to RC buildings, validating the method's effectiveness through non-linear time-history analyses using diverse seismic inputs. The findings underscore the potential of P-Spectra-based dissipative exoskeletons to enhance seismic resilience in existing RC structures efficiently and sustainably.