Session Dates
17 Oct 2002
Abstract
Box-beam headers are commonly used in walls framed with cold-formed steel studs to span openings in bearing walls. Based on the results of previous experimental studies, it has been shown that box-beam headers subjected to interior one flange (IOF) loading have been conservatively designed. This paper presents the results of an ongoing experimental study conducted at the University of Missouri-Rolla to establish the web crippling strength of box-beam headers for an IOF loading condition. Box-beam header specimens were tested as a system consisting of two C-sections together with top and bottom track sections. The header configuration used in this study is defined in the AISI pUblication Standard for Cold-Formed Steel Framing - Header Design (2000). Tested as a system, it was found that the web crippling strength was greater than that for two independent, single web C-sections. Based on the results of this study, an adjustment factor was developed to modify the web crippling strength determined using the AISI Specification for single web C-sections. An interaction equation was also derived for combined bending and web crippling.
Department(s)
Civil, Architectural and Environmental Engineering
Research Center/Lab(s)
Wei-Wen Yu Center for Cold-Formed Steel Structures
Meeting Name
16th International Specialty Conference on Cold-Formed Steel Structures
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 2002 University of Missouri--Rolla, All rights reserved.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Stephens, Sutton F. and LaBoube, Roger A., "Web Crippling and Combined Bending and Web Crippling of Cold-formed Steel Box-beam Headers" (2002). CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018). 3.
https://scholarsmine.mst.edu/isccss/16iccfss/16iccfss-session3/3
Web Crippling and Combined Bending and Web Crippling of Cold-formed Steel Box-beam Headers
Box-beam headers are commonly used in walls framed with cold-formed steel studs to span openings in bearing walls. Based on the results of previous experimental studies, it has been shown that box-beam headers subjected to interior one flange (IOF) loading have been conservatively designed. This paper presents the results of an ongoing experimental study conducted at the University of Missouri-Rolla to establish the web crippling strength of box-beam headers for an IOF loading condition. Box-beam header specimens were tested as a system consisting of two C-sections together with top and bottom track sections. The header configuration used in this study is defined in the AISI pUblication Standard for Cold-Formed Steel Framing - Header Design (2000). Tested as a system, it was found that the web crippling strength was greater than that for two independent, single web C-sections. Based on the results of this study, an adjustment factor was developed to modify the web crippling strength determined using the AISI Specification for single web C-sections. An interaction equation was also derived for combined bending and web crippling.
