Effects of Structural Bracing on the Progressive Collapse Occurrence

Statistics of human losses and financial casualties induced progressive collapse, as one the new modern concepts in field civil engineering, have doubled importance having knowledge about this phenomenon strategies to reduce its effect. Progressive collapse starts with a local failure loss load-carrying capacity small portion structure spreads throughout from element element. These consecutive failures may cause either entire or major part it. This paper studies effect adding bracing system steel moment frames designed for seismic loads through nonlinear dynamic method according GSA-2003 UFC-4-023-03 criteria. The study was conducted using computational simulation building models two different elevations three six floors located moderate seismicity region. results showed higher resistance against braced less sensitivity removal column spans comparison without bracing. prediction possible criterion is more conservative than criterion. Although, generally there no significant difference between analysis these