Influence of weak-axis flexural yielding on strong-axis buckling strength of wide flange columns

C. D. Stoakes, L. A. Fahnestock

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In multitier braced frames, the columns are typically wide flange sections with the weak axis oriented in the plane of the frame. Weak-axis buckling strength is commonly computed using an effective length equal to the tier height and the strong-axis buckling strength is based on an effective length equal to the total height of the braced frame. During a large seismic event, inelasticity in the braces can result in differential tier drifts that induce weak-axis flexural yielding of the columns. This inelasticity is not considered in current column strength curves. As a first step toward quantifying the influence of weak-axis flexural yielding on strong-axis buckling strength of wide flange columns, several representative isolated columns were subjected to compressive loads in combination with varying levels of weak-axis flexural yielding using three-dimensional finite element analysis. The results from the computational studies suggest that strong-axis buckling strength can be significantly degraded due to the presence of weak-axis flexure if the weak-axis rotation is large and torsional restraint is not provided at the tier levels.

Original languageEnglish (US)
Title of host publicationStructural Stability Research Council Annual Stability Conference 2012
Pages414-423
Number of pages10
StatePublished - Sep 20 2012
EventStructural Stability Research Council Annual Stability Conference 2012 - Grapevine, TX, United States
Duration: Apr 18 2012Apr 21 2012

Publication series

NameStructural Stability Research Council Annual Stability Conference 2012

Other

OtherStructural Stability Research Council Annual Stability Conference 2012
CountryUnited States
CityGrapevine, TX
Period4/18/124/21/12

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Safety, Risk, Reliability and Quality
  • Building and Construction

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  • Cite this

    Stoakes, C. D., & Fahnestock, L. A. (2012). Influence of weak-axis flexural yielding on strong-axis buckling strength of wide flange columns. In Structural Stability Research Council Annual Stability Conference 2012 (pp. 414-423). (Structural Stability Research Council Annual Stability Conference 2012).