Session Start Date

10-17-1996

Abstract

Current specification procedures for calculating the bending strength of members with multiple longitudinal intermediate stiffeners in the compression flange have been found to be inadequate. A new procedure for calculating the effective width of stiffened elements with multiple intermediate stiffeners is presented. The new method introduces the calculation of a buckling coefficient for overall buckling of the entire stiffened element as a unit, and local buckling of the subelement plates between stiffeners. The expression for calculating overall buckling is derived and verified via comparison to numerical methods. The minimum buckling coefficient from the two modes (local and overall) is used to calculate the critical buckling stress for the element. Using Winter's equation the effective width of the element is determined. The effective width is distributed as two strIps at the corners, in a manner similar to elements without· intermediate stiffeners. The resulting section is found to be a reliable predictor of the bending strength of members with multiple intermediate stiffeners in the compression flange.

Department(s)

Civil, Architectural and Environmental Engineering

Research Center/Lab(s)

Wei-Wen Yu Center for Cold-Formed Steel Structures

Meeting Name

13th International Specialty Conference on Cold-Formed Steel Structures

Publisher

University of Missouri--Rolla

Publication Date

10-17-1996

Document Version

Final Version

Rights

© 1996 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Oct 17th, 12:00 AM

Design of Cold-formed Steel Stiffened Elements with Multiple Longitudinal Intermediate Stiffeners

Current specification procedures for calculating the bending strength of members with multiple longitudinal intermediate stiffeners in the compression flange have been found to be inadequate. A new procedure for calculating the effective width of stiffened elements with multiple intermediate stiffeners is presented. The new method introduces the calculation of a buckling coefficient for overall buckling of the entire stiffened element as a unit, and local buckling of the subelement plates between stiffeners. The expression for calculating overall buckling is derived and verified via comparison to numerical methods. The minimum buckling coefficient from the two modes (local and overall) is used to calculate the critical buckling stress for the element. Using Winter's equation the effective width of the element is determined. The effective width is distributed as two strIps at the corners, in a manner similar to elements without· intermediate stiffeners. The resulting section is found to be a reliable predictor of the bending strength of members with multiple intermediate stiffeners in the compression flange.