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

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Presentation transcript:

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) 

Prelim. Formulation (dist. 2 of 2)

Modeling Nonlinear shell FE models of imperfect CFS member End displacements over desired P, M x, M y Boundary conditions and lengths to isolate local and distortional buckling Preliminary models completed with success

P-M major, distortional, C section

P-M minor, distortional, C section

Local DSM vs minor axis strength bounds for C Potential!

Selecting industry relevant beam-columns Trusses

Load combinations D+LLD+0.75LL+0.75WD+LL+W Fy (ksi)L- ftWPa-lbMa-ft.lbP- lbMmaxInteractionPM maxInteractionP lbM max- lbinInteraction DEVCO Lower level 600S psf lb502lb-ft lb536lb-ft0.727 ADTEK-Exterior bearing wall 600S rd floor psf/29p/f S nd floor psf/29p/f S st floor psf/29p/f NUCON 1st Exterior End walls psf3.540kips1.068ft-kips2.383kips0.418ft-kips0.89 1st Exterior walls psf3.540kips1.068ft-kips1.840kips0.629ft-kips0.92 2nd Exterior walls psf3.540kips1.068ft-kips1.280kips0.689ft-kips0.82 1st interior wall at unit AL-A 550NF psf2.371k0.751ftk2.329k0.083ft-kips0.98 1st interior wall at unit AL-A 350NF psf2.592k0.588ftk 2.329k0.083ft-kips0.9 Selecting industry relevant beam-columns Framing

Selecting efficient sections Most efficient P n /A M n /A

Identifying SSMA sections based on limit state

Selecting Member length

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

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