Prediction of residual stresses and strains in cold-formed steel members

Cristopher D. Moen, Takeru Igusa, B. W. Schafer

Research output: Contribution to journalArticlepeer-review

Abstract

The objective of this paper is to provide an unambiguous mechanics-based prediction method for determination of initial residual stresses and effective plastic strains in cold-formed steel members. The method is founded on basic physical assumptions regarding plastic deformations and common industry practice in manufacturing. Sheet steel coiling and cross-section roll-forming are the manufacturing processes considered. The structural mechanics employed in the method are defined for each manufacturing stage and the end result is a series of closed-form algebraic equations for the prediction of residual stresses and strains. Prediction validity is evaluated with measured residual strains from existing experiments, and good agreement is shown. The primary motivation for the development of this method is to define the initial state of a cold-formed steel member for use in a subsequent nonlinear finite element analysis. The work also has impact on our present understanding of cold-work of forming effects in cold-formed steel members.

Original languageEnglish (US)
Pages (from-to)1274-1289
Number of pages16
JournalThin-Walled Structures
Volume46
Issue number11
DOIs
StatePublished - Nov 1 2008

Keywords

  • Cold-formed steel
  • Finite element analysis
  • Residual strains
  • Residual stresses

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanical Engineering

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