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Direct Strength Prediction of Cold-Formed Steel Beam-Columns . Y. Shifferaw , B.W. Schafer Report to AISI February 2012. Current Progress. Prelim. Formulation (dist. 1 of 2). g. Prelim. Formulation (dist. 2 of 2). Modeling. Nonlinear shell FE models of imperfect CFS member

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direct strength prediction of cold formed steel beam columns

Direct Strength Prediction of Cold-Formed Steel Beam-Columns

Y. Shifferaw, B.W. Schafer

Report to AISI

February 2012

modeling
Modeling
  • Nonlinear shell FE models of imperfect CFS member
  • End displacements over desired P, Mx, My
  • Boundary conditions and lengths to isolate local and distortional buckling
  • Preliminary models completed with success
potential
Potential!

Local DSM vs minor axis strength bounds for C

selecting efficient sections
Selecting efficient sections

Pn/A

Most efficient

Mn/A

testing
Testing

Related recent testing:

Basic basis for our forthcoming testing…

current progress1
Current Progress

Conclusion: work is modestly behind, but progress being made. Looking forward to providing

More results, including testing results, at July meetings.