Cyclic Bending Tests to Determine Fully Ductile Section Slenderness Limits for Cold-Formed Circular Hollow Sections
Publication: Journal of Structural Engineering
Volume 130, Issue 7
Abstract
This paper determines new section slenderness limits suitable for design and construction of seismic resisting structural systems. It describes an experimental investigation of the cyclic inelastic flexural behavior of cold-formed circular hollow section (CHS) beams. Controlled-rotation, symmetrical cyclic bending tests were performed on different sizes compact CHS with section slenderness ranging from 13 to 39. With continuous cycling, the growth of ovalization caused a progressive reduction in the bending rigidity of the tube and eventually an instability occurred. The CHS beams exhibited stable hysteresis behavior up to local buckling and then showed considerable degradation in strength and ductility depending upon the ratio. Seismic capacity parameters are presented, including strength, stiffness, hysteresis loops and modes of failure for each specimen. Peak moments obtained in the cyclic tests were compared with those obtained in monotonic tests published previously and also with design moments predicted using a number of steel specifications. The deformation ductility demand was determined and used to derive new fully ductile section slenderness limits suitable for seismic design. A comparison is made between these seismic slenderness limits and the static limits available in the design codes.
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Published In
Journal of Structural Engineering
Volume 130 • Issue 7 • July 2004
Pages: 1001 - 1010
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Mar 11, 2003
Accepted: Jul 29, 2003
Published online: Jun 15, 2004
Published in print: Jul 2004
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