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Recent content by driftLimiter

  1. driftLimiter

    Combined Footing Design

    If you have satisfied yourself that concrete strength and bearing pressure distribution are okay, then there isn't a reason not to go with option 2 from that standpoint. There are some downsides to number 2 though from a construction standpoint. You have a jagged perimeter which requires more...
  2. driftLimiter

    Rack slab design - ACI 318 vs ACI 360

    318 is the code, 360 is a guide. 360 contains much more information specific to slab on grade and warehouse pallet racking as well as other considerations such as flatness tolerances that you need to consider.
  3. driftLimiter

    Seismic design base shear to ASCE7-16

    If AHJ says you need to use ELF for foundations I don't see how you can get around that. However you could consider use of ASCE 7-22 12.13.4 if permitted. The intent of this section is to address the issue that you present. But If you are saying that RSA gives you 1/5th the overturning of the...
  4. driftLimiter

    Carport MWRFS or Open

    Yep footnote 2 doesn't leave a lot of room for interpretation. If you have over 50% permanent blockage below the canopy in the direction of consideration then you go obstructed, if not then free.
  5. driftLimiter

    Carport MWRFS or Open

    Why not both? See ASCE7 27.3.2 and Figure 27.3-4
  6. driftLimiter

    Effective Wind Area - Stud Wall with Parapet

    Normally I would say that the element is the entire stud and its effective area is calculated based on its actual length & span/trib but the parapet presents a different scenario. How about ASCE 7-22 Section 30.6? And Figure 30.6-1. The parapet wind pressure is much greater than the wall surface...
  7. driftLimiter

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

    The load path from the diaphragm edge nailing to the rim, from the rim to the sill, from the sill through the bolts must all have at least the same or more strength as the diaphragm edge nailing. I don't usually worry about how additional flexibility due to this indirect load path to the chord...
  8. driftLimiter

    Hilti Profis Shear Reinforcement

    The shear lug is for this intent an 'anchor'. You can attempt to reinforce the anchor against breakout in shear. Hilti doesn't provide any guidance on this you need to refer to ACI or the Widianto et al for a rational method to do this.
  9. driftLimiter

    RAM ELEMENTS - MODELLING SAME STEEL FRAME (SAME INPUTS EXCEPT CONNECTIVITY AT NODE) WITH DIFFERENT OUTCOMES

    Did you verify the program understands the unbraced lengths properly? Beam flexure is significantly impacted by the unbraced length and many programs don't get this correct without user override.
  10. driftLimiter

    Seismic Analysis for Trapezoidal Shape House

    If the lateral element takes load from each direction you could consider combining the effects according to ASCE 7-16 12.5.3.1
  11. driftLimiter

    PEMB Shear Breakout

    1. Widianto is the best way to design anchor reinforcement that I have seen yet. Its tedious but effective. I don't think the compression is going to do much at a basic level. Perhaps some Mohrs circle effect on the stresses but I have not seen that addressed. 2. Yep stirrups everytime for...
  12. driftLimiter

    Simpson Strong-Link

    The seismic version is actually unique I believe in that the yielding mechanism is included in the connection elements. Sideplate and kaiser brackets still have a yielding beam element. For wind I can't really see why this is economical other than its easy to design.
  13. driftLimiter

    Simpson Strong-Link

    Idk about wind design. But for seismic this solution is actually quite useful because it reduces the beam bracing requirements for IMF and SMFs. It makes it more practical to spec these frames in wood construction. The downside I have encountered is the drift is quite a bit more and sections...
  14. driftLimiter

    Anchorage for wind design - do you use ultimate or service loads?

    I've just done tension load testing and basically said if it's working for tension it's working for shear. This was a case of epoxy anchors so the limit states for shear are not so much related to the bond strength etc.
  15. driftLimiter

    Post Installed Anchors Due to Anchor Misplacement

    So now Im curious about the epoxy mortar solution. Lets say you core 3" diam hole and then set an anchor in there with Sika212. Does that provide equal strength to a cast in anchor now? On a previous anchor repair project I was asked to justify that the grout develops sufficient interface...

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