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  • Users: Dusni
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  1. Dusni

    Column stability factor, Cp for timber pile

    Hi, I'm struggling to understand AASHTO's (Stnd Specs) guidance, which I have to follow instead of NDS. I understand NDS's approach: The derivation for equation H-2 above is as follows: Then if you have a circle instead of a square cross-section, d gets replaced with r * sqrt(12), where r...
  2. Dusni

    Fitting shear studs on short spans

    Hi, I'm working on a tied arch. The deck is supported by continuous stringers. The stringers are supported by floor beams spaced @ 25'. The floor beams are supported by hanger rods attached to the arch ribs. AASHTO requires (2) checks for shear studs: Fatigue: Use VQ/It to calc shear flow due...
  3. Dusni

    Shear load on bolts in built-up steel box girder due to Torsion

    Hi, The member is a steel box shape consisting of (4) plates held together with an angle in each corner. Each angle leg has a single bolt every 6" along the member length. I calculated the shear on the angle bolts in the direction parallel to the span due to vertical shear using VQ/It. For...
  4. Dusni

    Flexural Torsional Buckling of Built-up Column?

    Hi, I'm analyzing an old truss that has built-up diagonal members composed of (2) angles with lacing (forms a channel shape, with the lacing forming the web). AASHTO Table 6.9.4.1.1-1 says the applicable buckling modes for channels are flexural buckling (FB) and flexural torsional buckling...
  5. Dusni

    AASHTO Wood Reference Design Values (Table 8.4.1.1.4-1)

    Quick question... Southern Pine has the following size classifications: 2"-4" wide 5"-6" wide 8" wide 10" wide 12" wide 5"x5" and Larger Is "wide" the larger dimension? Is a 2x10 considered (2"-4") or (10" wide)?! Thanks
  6. Dusni

    AASHTO Buried Slab vs. Culvert Frame

    Hi, Background: I'm load rating a 3-sided culvert with about 3.5' of fill. There are provisions for slabs and culverts scattered throughout AASHTO LRFD Chapters 3, 4 and 5 as well as the MBE, and I find it confusing what is applicable to culvert frames vs culverts with simply supported top...

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