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  1. Ron247

    Anchorage of Structural Walls ASCE 7-16 12.11.2 Paradox

    The commentary has a section about when the equation (1+2*z/h)/3 must be taken as unity. Maybe that has something to do with it. The condition it mentions is not noted in the main chapter 12 text but it is in the commentary.
  2. Ron247

    Revit structures beginner

    At least with Statics and Mech of Materials, you should have a working understanding of Forces, Reactions, Stress and Deformations. IMO, at this stage, it is not just knowing what these terms and several others mean, it is a matter of having mental images forming rapidly and accurately of them...
  3. Ron247

    Revit structures beginner

    First, why don't give us some detail about what the beginners course covered. Since you are a first-year student, I assume you have not been exposed to much in the way of structures so far. Have you completed Statics or Strength of Materials (AKA Mechanics of Materials)?
  4. Ron247

    Bolt force in sleeve connection

    Your sketch shows gaps top and bottom between the components. If the sleeve is laid on the beam with all the gap at the bottom, then the top-left fastener is in tension and the lower left is either compression or zero at the same time depending on whether it has a pilot hole or not. In any...
  5. Ron247

    Light pole stiffener plates

    I would use thicker plates, cheaper and probably more reliable. The stiffeners in the detail look somewhat useless to me. Stiffeners try to route bolt loads towards the stiffener and thus reduce plate thickness. The locations of those stiffeners look like the corners of the plate will still...
  6. Ron247

    Manager Says Keep the Restraints — I Think They’re Unnecessary. Who’s Right?

    Just a preliminary look, but why terminate the column before it hits the roof? It looks like you can get rid of the horizontal beam braces without turning the entire thing into a double-cantilever (arm is a cantilever and column is a cantilever). How bouncy would this thing be if the column is...
  7. Ron247

    bARN WALL GIRT DEFLECTION

    Forget about a note from my previous post since your girts are not retaining the salt.
  8. Ron247

    bARN WALL GIRT DEFLECTION

    I would not rely on them to stop at 4', so cover yourself good with a stern and clear note. Also, require a note to be posted. Also, be cautious about mentally using the words "just and only". It is how we talk ourselves into something that sometimes is not a good idea. Only 4' is still 4'...
  9. Ron247

    PEMB Zee and Cee Purlins

    Also, are your Zs simple span or continuous? That may make some difference.
  10. Ron247

    PEMB Zee and Cee Purlins

    While a 4:12 may be a "standard offering" roof slope for many, a lot of PEMB roof structural logic was based on lower slopes (0.5:12 and 1:12). Somehow people have extended the design "logic" to 4:12s. I have seen many design calcs as if the purlins were 0:12 and then used on a 4:12 building...
  11. Ron247

    bARN WALL GIRT DEFLECTION

    Is the salt going to be piled against the wall like some grain storage or is it piled on the floor only and does not push on the wall? Strong direction of 2x6 horizontal, or vertical? 2x6 strong direction at 8' long should not be that flimsy. I see what DanKile noted, my table shows l/120 for...
  12. Ron247

    Shed Dormer on House w/ Exist Gable Dormer

    I guess the design did not account for joints in the 2x12s. The last one I witnessed was a steel center floor beam being cut for a new stairway in a 100+ year old multi-wythe. The project was not mine. I was called out by the contractor to look at vertical brick cracks in both front corners...
  13. Ron247

    Shed Dormer on House w/ Exist Gable Dormer

    I assume the window in the picture is the 33' wall in your drawing and that the right roof slope in the picture is the front existing gable. Looks like 2 different roof slopes in the picture. I realize by design the ridge board is not generally a structural member, but in this case, parts of...
  14. Ron247

    Shed Dormer on House w/ Exist Gable Dormer

    Based on the age, I assume the roof decking is plank. Is that correct? If so, how close are the planks to each other?
  15. Ron247

    Shed Dormer on House w/ Exist Gable Dormer

    I am trying to picture the original load paths since you will be altering that by any modification. Does the right side currently have a stiffleg near the brick wall like the left side? Is the stiffleg isolated to the hip rafter or is it part of a kneewall? What do you know about the floor...
  16. Ron247

    Shed Dormer on House w/ Exist Gable Dormer

    If the existing hip rafters or the hip jack rafters have vertical supports for them, they are most likely holding up the main ridge where the front dormer ridge frames into it. If they do not, then I am surprised that everything is currently intact unless you are not in an area with a...
  17. Ron247

    Shed Dormer on House w/ Exist Gable Dormer

    I never like answering something like this without a fairly clear idea of what is proposed. So here it goes. Is the picture the concept of the final product or the existing condition? How are you going to "anchor" to a brick wall? How is the brick wall built? Plan view of existing framing...
  18. Ron247

    Learning Structural Connection Types – Pin vs Fixed (Real World Example)

    Thanks, I noticed it at the last minute and from that point forward, I was confused. Then I saw 3 lanes, and 3 different Yield signs (I think). I actually thought it was a 1-way street. Dang-it, now I have to change my FE model to metric since it is AU!!
  19. Ron247

    Learning Structural Connection Types – Pin vs Fixed (Real World Example)

    Is this the famous bridge that trolls stay under? Looks tall enough for trolls but no one in the NBA. Am I missing something about the direction the sign faces? Looks like the sign info is on the far side but traffic also looks like it drives under the sign AFTER it has gone under the bridge...
  20. Ron247

    Learning Structural Connection Types – Pin vs Fixed (Real World Example)

    I think it is the last one, but I feel more comfortable building a Finite Element model before I commit. Is it safe for me to assume the temperature will be constant in the model?

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