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Evaluation of wind load integration in disproportionate collapse analysis of steel moment frames for column loss

TitleEvaluation of wind load integration in disproportionate collapse analysis of steel moment frames for column loss
Publication TypeJournal Article
Year of Publication2011
AuthorsGerasimidis S, Baniotopoulos CC
JournalJournal of Wind Engineering and Industrial Aerodynamics
Volume99
Issue11
Start Page1162
Pagination1162–1173
Date Published11/2011
KeywordsAlternate path method, Column loss, Damaged steel frames, Disproportionate collapse, Lateral load, Robustness, Wind loading
Abstract

The design of steel structures, in most cases, depends majorly on the level of wind loads which are prescribed by codes and regulations and are used in the structural analysis due to the fact that steel structures being light and ductile systems are strongly affected from a slight difference in the values of wind loading. During the last decades, disproportionate collapse analysis has become of major interest mainly due to the increasing number of failures occurring in that pattern. Commonly accepted guidelines and methods of analysis have been produced, the most dominating of which being the Department of Defense Facilities criteria or DoD. In the DoD, as well as in other criteria, the event of a column loss is suggested as the modeling scenario which has to be sustained by a structural system in order to be robust. However, all the guidelines so far have disconnected the column loss analysis from wind loads and have only performed it for gravity loading. This paper presents the dynamic time history disproportionate collapse analysis of steel frames, including various levels of wind loading. Interesting aspects are discussed through the parametric analysis of five different numerical examples of moment resisting frames.

DOI10.1016/j.jweia.2011.09.009