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  1. Althalus

    STAAD Feet vs Inches

    I've inherited a model that was built using inches as the base unit. But I've found problems with that when analyzing the section properties, etc. And it appears to be the case with the current model I have. Is there a fairly easy way to just scale down the model x1/12 so I can change all the...
  2. Althalus

    Dynamic Settlement

    I think this ^^ was what my coworker was talking about. Your wording is much more clear. Thanks.
  3. Althalus

    Dynamic Settlement

    I've received a client request that I've never been asked to look at before. A fellow engineer said that it was "just a number" and didn't really represent anything in the real world. CLIENT REQUEST: Provide calculations for soil settlement due to dynamic load conditions. I'm going to guess...
  4. Althalus

    FEA on a really Thick Box culvert

    For reasons I can't discuss, we have an extremely large box culvert with a 2' thick wall (all around). This box culvert is large enough to drive a car through. When applying load to any of the four planes, I'm wondering how one would take into account the corners. Say the box is 10' wide on...
  5. Althalus

    ASCE 7-22 Roof Wind Load

    OK, I did some calculations and I don't see those numbers generating the max vertical and horizontal as described. It must be some odd combination I'm not seeing. So, I spoke with a real wind expert on this matter. He said There is only one direction of load. It is not vertical or...
  6. Althalus

    Concrete beam loaded at the bottom?

    Thank you for your posts.
  7. Althalus

    Concrete beam loaded at the bottom?

    My team was given a cryptic message about our design from the design manager. And we won't be able to discuss with him for another day. Design: Concrete beam: 4ft x 3ft(H x W) with a 70ft clear span. 30kip load hanging down from an embed plate at the bottom of the beam. Embedment uses Nelson...
  8. Althalus

    ASCE 7-22 Roof Wind Load

    Sorry, I missed that detail. One is max vertical. The other is max lateral. Interesting.
  9. Althalus

    ASCE 7-22 Roof Wind Load

    I'm looking at the part of the table you cited (Windward side for h/L = 0.5 @ 10 degrees) Cp = -0.9 and -0.18. Both of those numbers are for the windward side. Both indicate uplift. When would the -0.18 ever control? This is only a 10 deg pitch. I can't come up with a scenario...
  10. Althalus

    Moment transfer through weld.

    I'm thinking that the project specifcations team has not looked at the load path carefully enough. But maybe I'm missing something. [ol 1] I have an embed plate that has an array of nelson studs welded to it. The studs are embedded on the underside of a concrete structure. On the underside of...
  11. Althalus

    STAAD Triangles

    these are plate/shell elements. Staad doesn't make a distinction. They are either line elements (beams/columns) or they are plates. The plates can be designated with various thicknesses and give the properties of steel or concrete. In this case, concrete. This is for out-of-plane loads. I...
  12. Althalus

    ASCE 7-22 Roof Wind Load

    Why are there two sets of values for Cp in Figure 27.3-1 (Continued)? I can understand if there is a positive or negative. But when they are both negative, I cannot conceive of a situation where the lower negative value (closer to zero) would govern.
  13. Althalus

    Water Saturation on Retaining Wall

    Thanks for all the comments. I'm afraid I'm not allowed to share a lot of details of this project. But you've given me food for thought. And there may be some considerations that the other engineers conservatively made, even if the probability is very low. I checked rainfall data in the...
  14. Althalus

    STAAD Triangles

    I tried asking Bentley this question and they never answered. I've noticed that if I use a triangular plate in a STAAD model, the resulting plate stresses are unusual. For some reason, a few of the stresses are completely uniform. All three corner stresses and the center stress are all the...
  15. Althalus

    Support reaction distribution in plate with one bolt

    Here's what happens in reality. 1. One end of the plate has a hole drilled such that the edge of steel hits that bolt first. 2. That bolt will yield a bit and possibly go into the plastic range for a tiny bit because it is taking double the design load. 3. That causes strain hardening to make...
  16. Althalus

    Opening Up Attic

    it is possible to do what you're intending. But you need to reinforce all the connection points. Some questions: 1. Is the connection at the top a true truss connection? i.e. are all the pieces of wood sandwiched by some steel plates that have been factory pressed? If so, you'll need an...
  17. Althalus

    Lateral system for row houses

    I am not sure about the one question (whether this single unit is not allowed to use the lateral capacities of the neighboring houses). It makes sense. But I've never done row houses. I have had an experience where the owner wanted pretty much the entire wall completely open (no shearwalls)...
  18. Althalus

    Lateral load on joist to joist connection

    I'm interpreting SDI deck on SJI joists. Correct? The diaphragm's function is to transfer the forces to the parallel edges (in this case, the short walls). This will include the attachment of the joists to the deck. You heard that right, joists to deck, not deck to joist. The joist doesn't...
  19. Althalus

    Wood Design Question

    For the most part I agree with the concensus here. The grading system does take into account the level of defects. That's a major part of the system. However, if you as an engineer see something that is so bad (like waning at an end that cuts out 50% of the cross-section) you might want to...
  20. Althalus

    Anchor Rod and Rebar Development Length

    The anchors being used are not threaded rod. They're fairly smooth rods.

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