1 / 7

Joist Explore and Report

Explore impact of lip & flange changes on elastic buckling & strength of joists. Teams conduct group exercises comparing dimensions & geometries to report results.

kforest
Download Presentation

Joist Explore and Report

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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 Barry and Mike • ½ in  1 in. lip – local stays the same, global stays the same • distort. 0.85 to 1.26 – 50% up, changed half-wave • Inward return lip • about the same as 1 in. straight lip • 2 in. long lip • local changes a bit, global ~ same, dist up another good amount

  5. Group 2: Team Flange Don and Gary • From baseline case.... (2 in. flange) • Flange down to 1 in., local up a small amount, distortional up a bit, global down b/c of reduced I • Flange up to 3 in., big My increase, but local and dist. down a bit, global up... Mn goes up a bit • 1 5/8 in. flange (down from 2) basically in between the 1 and 2 in. flange • Ribs put in the flange.. not much benefit except in local buckling...

  6. Group 4: Team Stiffener Woods, DavidM, DavidP • Accordion corrugation in the web – accordion depth 0.5 in. big boost in local, medium increase in distortional, global down a small amount – 1 in. accordion web – local wrong way, distortional still getting better... 2 folds in the web really boosted local! distortional up a modest amount too • Stiffener in the lip investigated, sigma style web looked at too, Intermediate stiffeners in the lip: no change in local, no real change in distortional, no change in global; Sigma style web: My down a few percent, but, local up to 2.1! distortional 1.21! global about the same – so went from 56 to 62 kip-in. nominal Mn • Stiffeners in the flange.. this is not the place to make changes, you get little change here.

  7. Group 3: Team Supports • skipped

More Related