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  1. DaveAtkins

    Beam Reinforcement Calculation

    I would use the shear flow formula, VQ/I, to determine the load per lineal foot in the weld. Then design the weld accordingly.
  2. DaveAtkins

    Eccentric Pad Footing with Tie Bars?

    There is a moment which must be resisted by the slab-on-grade. There will be an upward reaction at the center of the footing, not lined up with the downward wall load. The wall load times this eccentricity is a moment which must be resisted by the slab. The slab will need to be reinforced...
  3. DaveAtkins

    Roof Collapse in Madison Wisconsin

    Update - the collapse was caused by blocked drains. I think the takeaway is if your building does not have overflow drains or scuppers, you need to check the roof drains on a regular basis.
  4. DaveAtkins

    Roof Collapse in Madison Wisconsin

    Right. And they may not have had overflow drains. That seems to be a more recent thing.
  5. DaveAtkins

    Roof Collapse in Madison Wisconsin

    https://www.fox6now.com/news/woodmans-roof-collapse-madison-video I am guessing a ponding failure. I lived in Madison many years ago, and I believe this is an older building. Roof may not have been designed for ponding.
  6. DaveAtkins

    Shelf Support Steel Angle Fastened to Cold Form Exterior Stud for Brick Veneer

    Because there will be tension in the bolt, it will bend the stud flange. I suppose you could make a bolt work if you used a plate washer to prevent the flange from bending, or if the load is light enough, perhaps justify the flange bending.
  7. DaveAtkins

    Shelf Support Steel Angle Fastened to Cold Form Exterior Stud for Brick Veneer

    I have never used bolts to connect a brick veneer shelf angle to cold formed studs. I have always used welds. It is best to weld vertically, to the web, not horizontally, to the flange, because the flange can bend due to the tensile component of the moment.
  8. DaveAtkins

    2x10 Floor Joist Hung from Ledger

    That detail looks fine to me.
  9. DaveAtkins

    Birdsmouth I-Joist Cut

    I would share the photo with Boise and get their recommendation.
  10. DaveAtkins

    Design Advice for Sheet Piles Supported on Steel Columns

    Why are you transferring the sheet pile load to the catwalk columns? I think they should be treated separately.
  11. DaveAtkins

    What metal deck connections do you use for K joist?

    I just checked online - I guess gunpowder driven pins are still an option! Sounds dangerous to me[cannon]
  12. DaveAtkins

    What metal deck connections do you use for K joist?

    Early in my career (almost 40 years ago), I think they were called POWDER driven fasteners, because I believe there was gunpowder involved.
  13. DaveAtkins

    Snow drifts against low roof parapet per ASCE 7-22

    I think you should use lu = 344 feet for the low roof parapet. I don't know of any literature or code that allows you to reduce the upwind length of roof due to interruption by a parapet.
  14. DaveAtkins

    What metal deck connections do you use for K joist?

    I used to specify puddle welds, but now I always specify screws. Seem a little more foolproof to me.
  15. DaveAtkins

    Slab on Grade - Reinforcement Design and Placement

    You do not need to provide 0.5% reinforcement for such a small pad. That reinforcement ratio is for an infinitely large slab with no control joints. You should design the pad for any loads imposed upon it. I typically create a 3D finite element model supported on springs.
  16. DaveAtkins

    rectangular underground concrete vault built with single rebar mats in walls

    If you can justify the load path, you are OK from a strength and stability point of view. However, the corners could open up and allow ground water to seep into the vault. This in turn could lead to sink holes forming at the ground surface.
  17. DaveAtkins

    rectangular underground concrete vault built with single rebar mats in walls

    Normally the walls in a below grade vault are two way slabs -- they span horizontally and vertically. Without corner bars, I think your walls have to span vertically, from base slab to top slab. Are there no dowels between the wall and the base slab?
  18. DaveAtkins

    Effective Wind Area - Stud Wall with Parapet

    And to answer your original question, I have always used the entire height of the stud, including the parapet, to determine the C&C wind load.
  19. DaveAtkins

    Effective Wind Area - Stud Wall with Parapet

    When it comes to connections, I do not follow ASCE 7 literally. If you do, you need to calcuate the effective area to an individual fastener which makes the wind load unreasonably high.
  20. DaveAtkins

    Does a diaphragm chord need to attach to the diaphragm? See attached image.

    Agree with JAE.

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