Dimensione del carattere:
Influence of the Axial Behaviour of Braces in the Scissor-Toggle Configurations
Maria Maglio, Martina Della Corte, Alessandro Pisapia, Elide Nastri, Rosario Montuori, Vincenzo Piluso
Ultima modifica: 2025-08-12
Sommario
This study explores the enhancement of structural protection against seismic damage through Toggle Brace Dampers (TBDs), an innovative bracing system that maximizes energy dissipation. While TBDs have gained attention in recent decades, their behaviour remains partially understood. The research focuses on the amplification factor (f), which indicates how much displacement is transferred to the dissipative element relative to the structure's seismic displacement. Ensuring a high amplification factor requires analyzing its definition and influencing factors, such as rod deformability and stiffness ratio in the toggle mechanism. A design framework for TBDs is developed and tested through SAP2000 modeling, comparing different configurations via pushover analyses. Capacity curve and amplification factor-displacement relationship are generated. Results highlight that the scissor toggle configuration, with a 9° internal inclination angle and direct connection to the beam-column joint, offers optimal performance. However, real models show delayed activation due to rod deformability, reducing effectiveness at low displacements compared to traditional diagonal bracing. TBDs prove advantageous only when properly designed. Their effectiveness largely depends on parameter selection, particularly support placement. Further experimental research is needed to refine design methods and better understand critical factors.
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