Effect of Column Stiffness on Braced Frame Seismic Behavior
Publication: Journal of Structural Engineering
Volume 130, Issue 3
Abstract
Steel concentrically braced frames are generally designed to resist lateral force by means of truss action. Design considerations for columns in these frames are therefore governed by the column axial force while column bending moment demands are generally ignored. However, if the columns cannot carry moments, then dynamic inelastic time-history analyses show that a soft-story mechanism is likely to occur causing large concentrated deformations in only one story. Such large concentrations of damage are not generally seen in real frames since columns are generally continuous and they possess some flexural stiffness and strength. This paper develops relationships for column stiffness and drift concentration within a frame based on pushover and dynamic analyses. It is shown that continuous seismic and gravity columns in a structure significantly decrease the possibility of large drift concentrations. An assessment method and example to determine the required column stiffness necessary to limit the concentration of story drift is provided.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 130 • Issue 3 • March 2004
Pages: 381 - 391
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Jun 11, 2002
Accepted: Mar 28, 2003
Published online: Feb 19, 2004
Published in print: Mar 2004
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