ENHANCING SEISMIC RESILIENCE OF FLEXIBLE HIGH-RISE STEEL FRAME BUILDINGS USING ROCKING TRUSSES

The dynamic characteristics of buildings inherently exhibit significant variations. However, there is currently limited research focusing on assessing the inherent differences in building characteristics for seismic resilience and developing strategies to enhance seismic resilience in response to these variations. The Stiffness-Flexibility Indicator (SFI), determined by structural height and fundamental period, quantifies the stiffness and flexibility properties of buildings. These properties affect seismic displacement and acceleration responses, leading to diverse post-earthquake consequences. The study focuses on the flexible high-rise steel frame building, also known as uncontrolled flexible frame (FF). Adhering to the seismic resilience evaluation code (GB/T 38591 – 2020), the evaluation encompasses time history analysis considering design basis earthquakes (DBEs) and maximum considered earthquakes (MCEs). The findings indicate that FF has significant non-uniform inter-story drift but acceptable floor acceleration. To primarily address FF deformation, a seismic strategy with a self-centering rocking truss was implemented. The effectiveness of the controlled steel frame, denoted as FFRT (FF with Rocking Truss), was evaluated through a comprehensive analysis of seismic resilience. This assessment highlighted the enhancements brought about by the rocking truss in three key aspects: repair costs, time allocation, and personnel losses related to structural and non-structural components. Leveraging the SFI, direct determination of seismic control measures for steel frames is possible.