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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. 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

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  1. Direct Strength Prediction of Cold-Formed Steel Beam-Columns Y. Shifferaw, B.W. Schafer Report to AISI February 2012

  2. Current Progress

  3. Prelim. Formulation (dist. 1 of 2) g

  4. Prelim. Formulation (dist. 2 of 2)

  5. 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

  6. P-Mmajor, distortional, C section

  7. P-Mminor, distortional, C section

  8. Potential! Local DSM vs minor axis strength bounds for C

  9. Selecting industry relevant beam-columnsTrusses

  10. Selecting industry relevant beam-columnsFraming

  11. Selecting efficient sections Pn/A Most efficient Mn/A

  12. Identifying SSMA sections based on limit state

  13. Identifying SSMA sections based on limit state

  14. Selecting Member length

  15. Testing Related recent testing: Basic basis for our forthcoming testing…

  16. Current Progress Conclusion: work is modestly behind, but progress being made. Looking forward to providing More results, including testing results, at July meetings.

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