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  1. teleBob

    Lateral Torsional Buckling Bracing...

    Please check out the discussion on a contemporary thread "Web Stiffeners for Flange Bracing?". I found that Appendix 6 is quite helpful, but does not allow any calculation for continuous lateral compression flange bracing. Your question is appropriate in the example of a roof beam with metal...
  2. teleBob

    Web stiffeners for compression flange bracing?

    It is a TORSIONAL brace to keep the section from twisting, differentiated from a LATERAL brace that would keep the compression flange in a straight horizontal position. So, for the torsional brace, I will add steel tabs on the underside of the upper flange and also on the upper side of the...
  3. teleBob

    Web stiffeners for compression flange bracing?

    Thanks, everyone, for your comments. I now understand that web stiffening is not a proper substitute for external bracing, although it could serve to brace the bottom flange of a beam over a torsionally connected column if the top flange were laterally supported (for instance at a continuous or...
  4. teleBob

    Influence of Counterforts in Ret Walls

    As long as the counterfort wall is properly connected to the retaining wall, you should be able to depend on it, its footing and the soil weight above its footing to resist overturning. I would just check overturning on a 15 foot section of wall, or put 15 feet of soil pressure on the...
  5. teleBob

    Influence of Counterforts in Ret Walls

    The best way I have found to look at realistic behaviour of a retaining wall with frequent jogs (like a walk-out basement wall for a custom residence) is to model it in 3-D using Finite Element Analysis, like in StaadPro, Risa 3-D, etc. If you have width-to-height aspect ratios less than 3, you...
  6. teleBob

    Wall sheathing lapping Rim Joist

    A load path does exist from the wall sheathing to the sole plate through the floor sheathing and to the rim joist. I don't believe that prescriptive braced wall panels are required to lap the rim or connect to the foundation sill plate, although it certainly eliminates a lot of nailed...
  7. teleBob

    Web stiffeners for compression flange bracing?

    We are designing a general aircraft hangar building with 50 foot simple span steel header beams that support prefab wood trusses spaced at 24 inches. I am concerned about lateral support of the compression flanges. Using ASD AISC 9th Edition, for W27x94 (Fy=50) beams with Fb=.66Fy, lateral...

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