Failure of Cold-Formed Steel Beams during Concrete Placement
Publication: Journal of Performance of Constructed Facilities
Volume 19, Issue 2
Abstract
During a concrete placement on the second story of a building under construction, the supporting cold-formed steel beams collapsed. Four workers were injured. The collapse occurred while concrete was being placed onto steel decking on the second floor of the structure. Cold-formed steel beams, without shoring, supported the steel decking. Analysis of the steel beams under the weight of concrete and workers using the applicable American Concrete Institute and American Iron and Steel Institute documents indicated that the beams were overstressed for construction loads. After the collapse, part of the structure was rebuilt using thicker beams. For the reconstruction, the slab was shored. Designing with cold-formed steel requires knowledge of failure modes that can often be safely ignored with hot-rolled steel, such as local buckling. Engineers designing with this material should take care to obtain the proper codes and design documents.
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Acknowledgment
R. S. Prabhu provided important information about the properties of cold-formed steel sections to the writer, and his assistance is gratefully acknowledged.
References
American Iron and Steel Institute (AISI). (1997). Cold-formed steel design manual, 1996 Ed., American Iron and Steel Institute, Chicago, with errata.
American Institute of Steel Construction (AISC). (1998). Manual of steel construction, load and resistance factor design, 2nd Ed., Chicago.
Hanna, A. (1999). Concrete formwork systems, Marcel Dekker, New York.
Hurd, M. K. (1995). “Formwork for concrete.” Special Publication No. 4, American Concrete Institute Committee 347, 6th Ed., ACI, Farmington Hills, Mich.
Southern Building Code Congress (SBC). (1997). Standard building code, Birmingham, Ala.
Yu, W.-W. (1991). Cold-formed steel design, 2nd Ed., Wiley, New York.
Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 19 • Issue 2 • May 2005
Pages: 178 - 181
Copyright
© 2005 ASCE.
History
Received: Feb 5, 2002
Accepted: Aug 11, 2003
Published online: May 1, 2005
Published in print: May 2005
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