Special braced stairs versus typical braced frames. New architectural‐structural‐seismic approach to stair design

This paper presents a new approach to the project of steel buildings, mainly focused on architectural, structural, and seismic design stairs. The objective is structural stair system capable controlling damage contributing bracing building. article begins with review standard (ATC, FEMA, EC8) which current criteria for buildings stairs are based. research based two spatial building models (A–B) same elements but placed differently. Reference Model A follows classical approaches. It means, considered nonstructural that do not influence behavior structure corresponds typical braced frames (IV-CBF EBF) according EC8. B includes designed help control effects inter-story drifts inertia forces. In this case, were integrated into B. comparative analysis typically (A) versus specially (B) presented. was static nonlinear (pushover) capacity spectrum method (ATC-40) performance levels (FEMA) limitation (EC8). Finally, verified via time-history in order better capture safety evacuation routes their deterministic satisfactory results compared reference systems.