Session Start Date

10-17-1996

Abstract

The paper describes a design procedure for stainless steel columns failing by flexural buckling. In the approach, the stress strain-curve is assumed to be expressed as a Ramberg-Osgood curve, defined in terms of the initial modulus (E₀), the 0.2% proof stress (σ₀.₂) and the parameter n. It is shown that the column curve can be described in terms of the Ramberg-Osgood parameters by adopting a Perry-curve as basic strength curve and expressing the imperfection paranleter in terms of E₀, σ₀.₂ and n. By using a Perry-curve, the design procedure is explicit. This contrasts the iterative approach described in the ASCE-LRFD Specification for the Design of Cold-formed Stainless Steel Structural Members. The proposed strength curves are compared with tests of stainless steel columns. It is shown that the coefficient of variation of the ratio of test strength to design strength is lower using the proposed design approach than using the ASCE Specification. Thus, the proposed approach is more accurate than that described in the ASCE Specification. Being explicit it is also more efficient. Using the comparison with test results, the resistance factor to be used with the proposed design procedure is derived.

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

An Explicit Approach to Design of Stainless Steel Columns

The paper describes a design procedure for stainless steel columns failing by flexural buckling. In the approach, the stress strain-curve is assumed to be expressed as a Ramberg-Osgood curve, defined in terms of the initial modulus (E₀), the 0.2% proof stress (σ₀.₂) and the parameter n. It is shown that the column curve can be described in terms of the Ramberg-Osgood parameters by adopting a Perry-curve as basic strength curve and expressing the imperfection paranleter in terms of E₀, σ₀.₂ and n. By using a Perry-curve, the design procedure is explicit. This contrasts the iterative approach described in the ASCE-LRFD Specification for the Design of Cold-formed Stainless Steel Structural Members. The proposed strength curves are compared with tests of stainless steel columns. It is shown that the coefficient of variation of the ratio of test strength to design strength is lower using the proposed design approach than using the ASCE Specification. Thus, the proposed approach is more accurate than that described in the ASCE Specification. Being explicit it is also more efficient. Using the comparison with test results, the resistance factor to be used with the proposed design procedure is derived.