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Joist Explore and Report

Joist Explore and Report. nominal dimensions 8x2x0.5 t=0.054 straight corner model. cont. Team Exercises. Group 1:Team Lip Examine the influence of changing the lip length or lip geometry on the elastic buckling (M cr ), and (if time) the DSM strength – share then report.

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Joist Explore and Report

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  1. Joist Explore and Report nominal dimensions 8x2x0.5 t=0.054 straight corner model

  2. cont.

  3. Team Exercises Group 1:Team Lip Examine the influence of changing the lip length or lip geometry on the elastic buckling (Mcr), and (if time) the DSM strength – share then report Group 2: Team Flange Examine the influence of changing the flange width or geometry on the elastic buckling (Mcr), and (if time) the DSM strength – share then report Group 3: Team Supports Examine the influence of adding springs or supports at different appropriate locations in the section on the elastic buckling (Mcr) and (if time) the DSM strength – share then report Group 4: Team Stiffener Examine the influence of adding folded stiffeners at different appropriate locations in the section on the elastic buckling (Mcr) and (if time) the DSM strength – share then report

  4. Group 1: Team Lip • Varied lip length 0.3-2 in., tried return, and 45 • Lip length not local buckling, unless really long • Inc. lip length = inc. dist. Buckling • Lip not controlling allowables on this particular section (800S200-54), even HDS style lip not a big improvement • Did not try thickening the lip… • Cost analysis….

  5. Group 2: Team Flange • Tried bigger flange ( 3 in.).. • 12% increase in capacity • Tried single V in the middle of the 2 in. flange • 17.9% increase in capacity! • Tried other cases in the flange.. Single V was the winner in these trials

  6. Group 3: Team Supports • Put springs on top and bottom flanges, distortional goes up 1.21 • Two spring on top flange up to 1.31 (DB) • Springs on web.. Local went way up! (DB?) • Looked at other locations

  7. Group 4: Team Stiffener • Ribs and V’s in the flange, also looked at stiffening lip, also looked at planking (ribs) in the web • Double planking in the web, with returns, 18% increase in the moment capacity • Flange and lip help DB, but needed something in the web to get a big boost…

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