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  • Users: cal91
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  1. cal91

    Is this a custom built-up I-joist?

    Wondering if anyone has seen a wood I-joist like this. The building was built in 1988. I've asked RedBuilt as it seems similar to their 28" Red-I90HS. Hopefully they reply tomorrow. This is in a warehouse in Stockton, CA. 40' x 40' bays. These span 40' and are spaced at 8'-0" o.c. I...
  2. cal91

    Large Concrete Cracks in Basement

    I'm with you but the problem is that the builder doesn't need to convince you that this is reasonable performance. You need to convince the builder that it is not reasonable performance, and that they are legally obligated to fix it. Good ole' burden of proof.
  3. cal91

    Large Concrete Cracks in Basement

    The contractor sent a photo of the floor plans for the basement, first floor, and second floor. Will be getting the full set of plans including notes and details from the city this week. The post has only 72 square feet of tributary area at the 2nd floor (master bedroom), and a 3x3 footing...
  4. cal91

    Large Concrete Cracks in Basement

    Thanks all. Trying to get building plans and will update soon.
  5. cal91

    Large Concrete Cracks in Basement

    Thanks guys. I'm not sure if there's a footing under the (4) ply post. There SHOULD be, but who knows? The (4) ply is a post that continues through the floor and up to the roof. The (3) ply is header studs.
  6. cal91

    Large Concrete Cracks in Basement

    I was asked to look at some slab cracks in an unfinished basement. The house is coming up on a year old (when the warranty expires). The builder was asked to come and look, and he said they were fine and they would not fix the cracks. The cracks are near structural posts, and there is moderate...
  7. cal91

    Steel Joists Supporting Parking

    Hello, I have a steel framed building currently in design phase. It will have rooftop parking, no Trucks, so 40 PSF live load. The spans will be 55'-0", will have a 4" topping slab, over 3" structural slab over W3 deck, so 10 total thickness. With the spans being 55'-0", we are looking into...
  8. cal91

    Can you solve the Rigid Plate on Springs Puzzle?

    It seems overkill to have each cable/connection/spreader bar designed to carry half the load of the unit. We're taking care to ensure that the cables are the correct length such that the weight is distributed across all the cables. Here's a youtube video of what we're hoisting...
  9. cal91

    Can you solve the Rigid Plate on Springs Puzzle?

    AaronMcD is correct. It balances all three equilibrium equations. Azcats has F and Mx balanced but My is not balanced.
  10. cal91

    Can you solve the Rigid Plate on Springs Puzzle?

    Well done Denial and Aaron McD! I arrived at the same conclusion using the same method. Azcats, I was trying to use the method, P/N + M*x/Ix + M*y/Ix, but the problem is the M*X/Ix will have components in the y direction. The real world interpretation being, if you put a force directly on the...
  11. cal91

    Can you solve the Rigid Plate on Springs Puzzle?

    I'm designing hoisting/rigging/spreader bars for picking these large modules. They give me the attachment points to the modules and where the center of gravity is. So I just need to figure out how much force is going into each pick point. Theres are large modules with 12 pick points each, and I...
  12. cal91

    Old Bowstring Wood Truss Bottom Chord Split. Worried.

    That last picture clearly shows the split propogated from the connection bolt, and then through the knot.
  13. cal91

    Old Bowstring Wood Truss Bottom Chord Split. Worried.

    Turns out there's (2) 1" Ø turnbuckle steel rods at each bottom chord as well. I'm not sure how I'd know how much force is going into the rods vs staying in the wood, but it's definitely a relief that they are there. dhenger, great suggestion, and PropertyGuy67, thanks that is super helpful...
  14. cal91

    Old Bowstring Wood Truss Bottom Chord Split. Worried.

    Thanks everyone for your responses, very helpful. Busy at the moment but will responding later today be posting other pictures, none are a whole lot better unfortunately.
  15. cal91

    Old Bowstring Wood Truss Bottom Chord Split. Worried.

    I've got this 50 to 60 year old warehouse with these existing bowstring trusses. California, light wind, no snow. The owner is putting up a structure interior to this existing one, I am doing calculations for the interior structure only. However, the architect just sent me this picture...
  16. cal91

    Wood Shearwall Overstrength

    Great. Thanks Deker.
  17. cal91

    Shear Wall Cost Efficiency

    ...Ex. 40,000 10D nails vs 60,000 8D nails. 10D nails = 40,000 nails ($40/hour) / (1000 nails/ hour) = $1,600 in labor. 10D nails = 40,000 nails * ($0.02 / nail) = $800 in material $2,400 total 8D nails = 60,000 nails ($40 / hour) / (1000 nails / hour) = $2,400 in labor 8D nails = 60,000...
  18. cal91

    Wood Shearwall Overstrength

    I'm trying to find code provisions addressing overstrength but am coming up short. It's intuitive to design both the sill plate anchors in shear for overstrength and the holdown anchors in tension for overstrength. At least for failure modes involving concrete. However it seems many people...
  19. cal91

    Shear Wall Cost Efficiency

    I'm creating my shear wall standards and would like to hear other's experience on what is most cost efficient. Obviously 8d nails are cheaper than 10d, 6" spacing cheaper than 4", and regular (whats a better term to distinguish?) panels are cheaper than structural 1, and 15/32" panels are...
  20. cal91

    1-bolt connection

    Two bolts is also nice for erection. The iron worker sticks his spud through one hole to align the pieces and then he can bolt up the other hole. With only one bolt you can't do that, so one bolt should only be used on small pieces.

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