WEB CRIPPLING OF COLD-FORMED STEEL MEMBERS

摘要

The North American Specification for the Design of Cold-Formed Steel Structural Members (NAS 2001) has recently adopted a new web crippling approach, which is the approach contained in the Canadian S136 Standard (CSA 1994). The objective of this work was to develop new design coefficients for the web crippling strength design expression currently used in the Canadian S136 Standard (CSA 1994) and the North American Specification (NAS 2001). An extensive statistical analysis was performed using published test data up to 1999, from the United States, Canada and Australia. The resulting web crippling coefficients, calibrated resistance factors and respective factors of safety of this study, have been adopted by the North American Specification (NAS 2001). The new coefficients were developed based on section geometry, loading case and two different support conditions, fastened to the support and not fastened to the support during testing. The new coefficients showed excellent agreement with the test data for a wide range of cross section dimensions, yield strengths, bearing lengths and angle of web inclination.