Session Dates

19 Oct 2000

Abstract

An experimental investigation of cold formed steel stiffened C-and Z sections subjected to web crippling is presented in this paper. This study was devoted to two loading conditions according to the AISI Specification, namely End Two Flange (ETF) and Interior Two Flange (ITF) loading, with particular emphasis on large inside bend radius to thickness ratios, R, (up to 12) and the specimens being fastened to the support during testing. There is no experimental data available in the literature regarding the web crippling resistance of such members that are fastened to the support and have inside bend radius to thickness ratios greater than 2.7. A total of 72 tests were conducted on C-and Z sections at the University of Waterloo, Waterloo, Canada. Although most of the parameters of the test specimens were beyond the limits specified by the current North American Cold Formed Steel Design Standards (AISI and S136), the test results were compared to the calculated values of the AISI and the S136 web crippling design equations. This was done in an effort to determine the behavior of the current design equations for fastened to the support sections with large inside bend radius ratios. Using the same model of the web crippling design expression currently used in S 136, a nonlinear regression analysis was used to establish the new coefficients for the ETF and ITF loading conditions for both C and Z-sections. The new coefficients showed an excellent agreement with the test results. Furthermore, the S 136 design expression was calibrated for the safety requirements of both the S136-94 Standard and the AISI Specification.

Department(s)

Civil, Architectural and Environmental Engineering

Research Center/Lab(s)

Wei-Wen Yu Center for Cold-Formed Steel Structures

Meeting Name

15th International Specialty Conference on Cold-Formed Steel Structures

Publisher

University of Missouri--Rolla

Document Version

Final Version

Rights

© 2000 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Oct 19th, 12:00 AM

Web Crippling of Cold Formed Steel C-and Z- Sections

An experimental investigation of cold formed steel stiffened C-and Z sections subjected to web crippling is presented in this paper. This study was devoted to two loading conditions according to the AISI Specification, namely End Two Flange (ETF) and Interior Two Flange (ITF) loading, with particular emphasis on large inside bend radius to thickness ratios, R, (up to 12) and the specimens being fastened to the support during testing. There is no experimental data available in the literature regarding the web crippling resistance of such members that are fastened to the support and have inside bend radius to thickness ratios greater than 2.7. A total of 72 tests were conducted on C-and Z sections at the University of Waterloo, Waterloo, Canada. Although most of the parameters of the test specimens were beyond the limits specified by the current North American Cold Formed Steel Design Standards (AISI and S136), the test results were compared to the calculated values of the AISI and the S136 web crippling design equations. This was done in an effort to determine the behavior of the current design equations for fastened to the support sections with large inside bend radius ratios. Using the same model of the web crippling design expression currently used in S 136, a nonlinear regression analysis was used to establish the new coefficients for the ETF and ITF loading conditions for both C and Z-sections. The new coefficients showed an excellent agreement with the test results. Furthermore, the S 136 design expression was calibrated for the safety requirements of both the S136-94 Standard and the AISI Specification.