Efficient Configuration of Steel Lateral Load Resisting System (LLRS) Considering Progressive Collapse

Abstract

The stability and safety of high-rise and complex structures largely depend on the effectiveness of their lateral load resisting systems (LLRS). Conventional designs primarily focus on resisting wind and seismic forces; however, recent catastrophic events have highlighted the vulnerability of structures to progressive collapse, where local failures can trigger disproportionate structural damage. This research addresses the efficient configuration of steel LLRS with explicit consideration of progressive collapse mechanisms. A comprehensive literature review identifies limitations in existing approaches, including inadequate redundancy, lack of alternative load paths, and insufficient integration of seismic and dynamic effects. The study proposes an optimized configuration of steel LLRS that redistributes loads under localized damage scenarios to enhance robustness and minimize failure propagation. The methodology involves nonlinear static pushover analysis (NSPA) and nonlinear time history analysis (NLTHA) to evaluate and validate structural performance under varied loading and damage conditions. The expected outcome is a more resilient LLRS framework capable of preventing disproportionate collapse, thereby safeguarding lives, reducing economic losses, and improving structural sustainability.