Nonlinear Dynamic Analysis of Steel Frames by Modal Superposition
Publication: Journal of Structural Engineering
Volume 123, Issue 11
Abstract
When analyzing steel frames subjected to dynamic loads, several geometrical and material nonlinearities can be encountered in the early stages of loading. These include second-order effects, and semirigid connection and panel zone nonlinearities, respectively. The well-known modal superposition procedure, which is a very popular method for linear dynamic analysis, can be easily modified to perform nonlinear analysis while retaining many of the advantages of the method in the linear range. These modifications are developed in this paper. Element models are derived for panel zone elements and for two types of connection moment-rotation curves. Several approximations of panel zone behavior are also examined and a sample frame is analyzed. Extensive numerical studies are presented. The methodology presented was found to be both a useful and relatively fast method for nonlinear dynamic analysis of steel frames. It was also found that connection and panel zone behavior affect frame behavior and, hence, must be considered in the dynamic analysis. Connection and panel zone behavior are particularly important when frame drift is the controlling criterion in the design, as tends to be the case for taller frames.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 123 • Issue 11 • November 1997
Pages: 1519 - 1527
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Nov 1, 1997
Published in print: Nov 1997
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