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  1. Thoughtclaw

    Cracking block

    Hey folks, a customer came to me with concerns about the following situation. We've got two courses of block on top of a wall footing that are fully grouted and have started to form hairline cracks. I'm wondering if the grout is expanding and contracting, and maybe that's what's causing the...
  2. Thoughtclaw

    Cracked block over cold joints in foundation

    It appears to be settlement to me, but it's hard to say without digging out next to the footing.
  3. Thoughtclaw

    Cracked block over cold joints in foundation

    Hey folks, I was called out to look at a new building where hairline cracks have appeared in the block over cold joints in the strip footing underneath. The customer says he'll be satisfied as long as it doesn't get any worse. I'm thinking of epoxying rebar into the existing footing and...
  4. Thoughtclaw

    Walls separating from building

    Thanks, everybody. I can tell you that the trusses have plenty of bearing on the block. I have no information on vertical rebar (or lack thereof) in the walls, but I can investigate that. But clearly Cliff is correct that there's no corner joint reinforcement. I will figure out the wind...
  5. Thoughtclaw

    Walls separating from building

    Hey folks. I just visited a block building in which both the front and rear walls are separating from the rest of the building, and appear to have been doing so for quite a long time. I've attached a bunch of photos. I haven't seen anything quite like it. My initial thought is to put an angle...
  6. Thoughtclaw

    Suspension bridge for piping?

    Thanks so much, guys. I'm going to explore the truss idea. I feel silly for not thinking of it myself.
  7. Thoughtclaw

    Suspension bridge for piping?

    Hey folks, I've been asked to design a bridge structure that will carry some piping across a parking lot, a span of 70 feet. The client was thinking a suspension bridge might make the most sense, given the long span, but we're only talking about a load of 2.9 pounds per lineal foot, and the pipe...
  8. Thoughtclaw

    Circular steel plate

    Thanks so much, Joel. I was able to figure it out with the software. Dik, thanks for your questions. I designed it as a flexure element. The flat of the angle will be welded to the plate.
  9. Thoughtclaw

    Circular steel plate

    Apparently my file didn't properly attach. Trying again.https://files.engineering.com/getfile.aspx?folder=c9068e7e-45be-486e-9f13-027eb0425268&file=EPSON273.PDF
  10. Thoughtclaw

    Circular steel plate

    Hello all. I've been asked to design a steel plate to support a 12'0" tall water tank with a 10'0" diameter. The framing has already been designed by others, but the tank manufacturer has said we need to put a plate under it. There is a 6x6 angle down the center of the frame (very rough sketch...
  11. Thoughtclaw

    Spalled Spancrete

    Thanks for your input, Ingenuity. It was built in 1999.
  12. Thoughtclaw

    Spalled Spancrete

    Apparently only one photo uploaded; here's another one.https://files.engineering.com/getfile.aspx?folder=0399a5e7-6708-4859-a4ef-1009009e6222&file=193226427_319660049698930_8304357573105270891_n.jpg
  13. Thoughtclaw

    Spalled Spancrete

    I was just called out to inspect some fresh spalling in a Spancrete panel at a car dealer/service shop. The photos show the bottom half of an 8" panel that has 2" of concrete poured overtop. We had a brief but intense rainstorm here yesterday, and it's not clear whether the spalling happened at...
  14. Thoughtclaw

    Drift load between doghouses on roof

    Thanks again, guys. The exception still doesn't apply because the projection is going to be flashed directly into the existing roof. The only roof plan I have is the sketch I attached with my initial post. The units are denoted by X's.
  15. Thoughtclaw

    Drift load between doghouses on roof

    Thanks, Dik and Curveb. I have 7-10, not 7-16, but I'm guessing you're referring to the provision that you can neglect drift if it's less than 15 feet? Both sides are longer than that. And unfortunately, they have to be where they are. I'll go ahead and add the loads together. I appreciate the...
  16. Thoughtclaw

    Drift load between doghouses on roof

    I'm designing a pair of doghouses in an existing building to accommodate machines that are taller than the existing roof. They're close enough together that the snow drift loads (as they would be if not for the other doghouse) intersect. I've attached a rough sketch showing the drift loads only...
  17. Thoughtclaw

    Design of poured walls

    The company manufactures perlite and vermiculite. Perlite is extremely light, so I'm looking at it as if it's all vermiculite. Making some conservative assumptions, I came up with 15". Obviously it's not a final design, but I've got a pretty good handle on it now. Thanks to both of you for your...
  18. Thoughtclaw

    Design of poured walls

    Thank you, jayrod12. That at least gives me an idea of how to get started.
  19. Thoughtclaw

    Design of poured walls

    I've been asked for to give a preliminary size (for bidding purposes) of 12' tall poured walls for a manufacturing company. They're going to be storing heavy materials in each area of the building, and loading and unloading them with bulldozers. The attached sketch shows the anticipated weight...
  20. Thoughtclaw

    Cutting off bar joists; replace bottom with I-beam

    The building dates back to the early 1980s. So it's older, but not super-old.

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