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  1. Rigger12

    Residential beam sizing for deflection

    Looking at the numbers provided in Metwoods example for the 7 1/4" beam for my situation, I dont see how it's better than a double MC 7x22.7, I have a 13' triburaty width, LL 40psf, floor DL of 15pf and I added an additional linear deadload laong the beam for a partition wall located above the...
  2. Rigger12

    Residential beam sizing for deflection

    That’s exactly what I’m going to do at this point, I wasn’t sure if I was being drastically overconservative with the deflection limits I was trying to meet, and from the different opinions it doesn’t seem like I am, I was trying to fully hide the beam in the ceiling, but I’d rather just upsize...
  3. Rigger12

    Residential beam sizing for deflection

    Thanks for the suggestions, yeah so maybe it would make sense to just go with a W10 and clad it to look like a reclaimed wood beam to break the ceiling up, and I appreciate the other suggestions to, I’ll have to give those ideas to my boss (my wife), she’s the one that ultimately has to like it...
  4. Rigger12

    Residential beam sizing for deflection

    So that comes back to my original question of if I was being grossly over conservative trying to keep total deflection under L/600, which some seem to be saying I am others are saying that’s what they design to. The double MC7x22.7 would satisfy a live load deflection of L/600 (would be L/709)...
  5. Rigger12

    Residential beam sizing for deflection

    Pharmeng yes, sadly the double MC7x22.7 is L/438 in deflection from total load, I was trying to keep it under L/600 total, I’m not looking at the numbers now but I think I would need an W8x40 to keep it to L/600 total, which would stick down from the ceiling a little bit. XR250, the advantage...
  6. Rigger12

    Residential beam sizing for deflection

    Thanks for the info, I'll talk to my GC to see how he would want to do that. I also just looked into doing (2) MC7x22.7's back to back, I'm getting a LL deflection of L/709, and total deflection of L/438. So that may also be a winner since it's only 7 inches deep. My main concern is the total...
  7. Rigger12

    Residential beam sizing for deflection

    We're looking to cut the existing joists, pack the beam with hardwood and put the beam up in the floor and then attach the joists with hangers, that way it will be as little hanging down as possible, we only have 8' ceiling and were trying to not have any bump down, but 2x8's are only 7.25"...
  8. Rigger12

    Residential beam sizing for deflection

    I'm currently sizing a beam to take out a load bearing wall in my own home (to open up between the kitchen and dining room) and have a couple questions about how you size for deflection limits when removing an existing wall, on new construction we size for live load deflection as the dead load...
  9. Rigger12

    "Design and Construction of Lifting Beams"-David Ricker, Question regarding lifting lug de

    I am currently making a spreadsheet to determine the capacity of lifting lugs using the processes laid out by David T. Ricker in his article "Design and Construction of Lifting Beams" published by AISC in 1991. In the article he states the 4 failure modes to check are: 1. Tension Failure at the...

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