Session Start Date

10-19-2000

Abstract

The design approach for predicting the increase in yield strength due to cold work of forming in the AISI 1996 Specification for the Design of Cold-Formed Steel Structural members is different from the approach used by the CSA Standard, CSA S136-94, Cold Formed Steel Structural Members. The AISI approach is based on the experimental work conducted by Karren and Winter, while the S136 approach is based on theoretical work by Lind and Schroff. Lind and Schroff used Karren and Winter's data to substantiate their theory. Karren and Winter conducted tests on five full sections and also collected strength data on the flat and corner elements of the same sections, allowing for comparison oftested to calculated values. Twelve different sections were tested as part of the University of Waterloo test program. Strength data was collected on virgin material, full sections and on the flat elements of formed sections, thus permitting comparisons to be made using only experimental data. The main purpose of this investigation was to help answer two questions, Le., 1) should the average yield strength in the flats after forming be allowed in either design approach? and 2) is there a simplified expression that would produce similar results with fewer inputs? Based on the research of this paper, design recommendations were formulated.

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

Publication Date

10-19-2000

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

Yield Strength Increase of Cold Formed Sections Due to Cold Work of Forming

The design approach for predicting the increase in yield strength due to cold work of forming in the AISI 1996 Specification for the Design of Cold-Formed Steel Structural members is different from the approach used by the CSA Standard, CSA S136-94, Cold Formed Steel Structural Members. The AISI approach is based on the experimental work conducted by Karren and Winter, while the S136 approach is based on theoretical work by Lind and Schroff. Lind and Schroff used Karren and Winter's data to substantiate their theory. Karren and Winter conducted tests on five full sections and also collected strength data on the flat and corner elements of the same sections, allowing for comparison oftested to calculated values. Twelve different sections were tested as part of the University of Waterloo test program. Strength data was collected on virgin material, full sections and on the flat elements of formed sections, thus permitting comparisons to be made using only experimental data. The main purpose of this investigation was to help answer two questions, Le., 1) should the average yield strength in the flats after forming be allowed in either design approach? and 2) is there a simplified expression that would produce similar results with fewer inputs? Based on the research of this paper, design recommendations were formulated.