Session Start Date

10-15-1998

Abstract

Results of an extensive experimental investigation of the web crippling behavior of cold formed steel C-sections are presented. This study was devoted to the End One Flange, EOF, loading case, with particular emphasis on large inside bend radius to thickness ratios, (R = ri/t). Seventy-two C-sections with R values ranging between five and 10 were tested at the University of Waterloo. Comparing the experimental results with predictions using the current North American Cold Formed Steel Design Standards, considerable underestimation was observed. Using the same model of the design expression currently used in the Canadian Standard (S136-94), and including 164 test results, a nonlinear regression analysis was conducted to establish the new coefficients for the EOF design expression of single web members. The proposed "Waterloo Expression" showed excellent agreement with test results. Furthermore, the expression was calibrated for the safety requirements of both the Canadian Standard (S136-94) and the American Specification (AISI). Based on this study, it is recommended that the "Waterloo Expression" be adopted by the North American Cold Formed Steel Design Standards.

Department(s)

Civil, Architectural and Environmental Engineering

Research Center/Lab(s)

Wei-Wen Yu Center for Cold-Formed Steel Structures

Meeting Name

14th International Specialty Conference on Cold-Formed Steel Structures

Publisher

University of Missouri--Rolla

Publication Date

10-15-1998

Document Version

Final Version

Rights

© 1998 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Oct 15th, 12:00 AM

Web Crippling of Single Web Cold Formed Steel Members Subjected to End One-flange Loading

Results of an extensive experimental investigation of the web crippling behavior of cold formed steel C-sections are presented. This study was devoted to the End One Flange, EOF, loading case, with particular emphasis on large inside bend radius to thickness ratios, (R = ri/t). Seventy-two C-sections with R values ranging between five and 10 were tested at the University of Waterloo. Comparing the experimental results with predictions using the current North American Cold Formed Steel Design Standards, considerable underestimation was observed. Using the same model of the design expression currently used in the Canadian Standard (S136-94), and including 164 test results, a nonlinear regression analysis was conducted to establish the new coefficients for the EOF design expression of single web members. The proposed "Waterloo Expression" showed excellent agreement with test results. Furthermore, the expression was calibrated for the safety requirements of both the Canadian Standard (S136-94) and the American Specification (AISI). Based on this study, it is recommended that the "Waterloo Expression" be adopted by the North American Cold Formed Steel Design Standards.