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  1. Mike Mike

    IEBC Allowable 5% Gravity Increase on Total Load or Load Type?

    RWW, agreed, similar to the deficiency you pointed out in your previous post, increasing snow from 0 to 5psf would mandate design per IBC, even if the same project was reducing the dead from 100psf to 10psf. "confusing wording got inserted" is a nice way of putting it, very charitable. phameng...
  2. Mike Mike

    IEBC Allowable 5% Gravity Increase on Total Load or Load Type?

    Thanks lex, read thru all your stuff and it looks like I would need to set myself a reminder to submit my proposal between October 15, 2027 and January 10th, 2028. Then there would be a bunch of rounds of stuff that I would probably need to partake in, culminating in maybe 10 hours of my time? I...
  3. Mike Mike

    IEBC Allowable 5% Gravity Increase on Total Load or Load Type?

    Lex, in your case D+S would increase 5%, not 10% 1.05D + 1.05S = 1.05(D + S) Thanks for the tips, I am way too busy with work to get into the committees right now, but I'm writing all this down on my to do list for the next housing bubble / virus leak. I assume all Reid Middleton's stuff goes...
  4. Mike Mike

    IEBC Allowable 5% Gravity Increase on Total Load or Load Type?

    great point RWW about increasing load cases that don't control. anyone know are ICC committee member positions typically volunteer? or are they paid? maybe it's time I became part of the solution
  5. Mike Mike

    IEBC Allowable 5% Gravity Increase on Total Load or Load Type?

    Flotsam, oh, I just scrolled up. I see you and hturak were the others in the "each load" camp. Unfortunately it looks like we got out-voted by the silent majority Trak, EZ, respawn, and gte. 4 to 3. Celt and Waysh, do you have a vote? Is there any argument to be had for the 5% rule applying to...
  6. Mike Mike

    IEBC Allowable 5% Gravity Increase on Total Load or Load Type?

    Flotsam, If dead, live, and snow all increase by 4.9%, the combined load would increase 4.9%. In this case the increase is not sufficient to mandate member reevaluation per either edition: 2018 IEBC and later or 2015 IEBC and earlier. Does that answer your question? Not sure I understand the...
  7. Mike Mike

    IEBC Allowable 5% Gravity Increase on Total Load or Load Type?

    "... causes an increase in ... dead, live, or snow ... of more than 5% ..." if Waysh's roof top unit increases the dead load by 6%, this clause returns a value of true, even if the total load only increases by 3%. it's just english. can anyone think of a way to interpret this clause as false?
  8. Mike Mike

    IEBC Allowable 5% Gravity Increase on Total Load or Load Type?

  9. Mike Mike

    IEBC Allowable 5% Gravity Increase on Total Load or Load Type?

    I agree with the majority that the rule should be 5% of total load. I disagree with the majority that the rule is 5% of total load. ICC has clearly stated their requirements. From a legal standpoint, we are generally not permitted to flaunt any requirements, even where the committee has...
  10. Mike Mike

    The beam is too deep Mr. Engineer

    ANE91, Yes, a line has to be drawn somewhere. The line will be different for each of us.
  11. Mike Mike

    The beam is too deep Mr. Engineer

    I have no issue with any of these solutions if properly designed and detailed. I agree with everyone above. Another solution I might be ok with is (6) 1 3/4 x 9 1/4 LVL. Just gotta make sure it's detailed to facilitate load sharing between plies, which could get expensive. Might be better to...
  12. Mike Mike

    Timber Detail for Torsion Due to Eccentricity

    drlt5, in light framing we typically don't belabor unbalanced loads on flush beams, but I think you're right to think it thru for mass timber, where there may be less redundancy and load spreading. I agree with all comments above. if your eccentricity is extreme, Kootk's analysis will reveal...
  13. Mike Mike

    Shear Lag

    Thanks 217808, I had not seen this article before and have not dug into the canadian standard, but assuming x bar prime is the same as x bar this formula gives U = 0.43, plenty for our scenario. Packer's paper appears to be behind a paywall, but I did reach out to him directly. I agree if...
  14. Mike Mike

    Shear Lag

    217808, #1 The specification does not state the length of the weld must be greater than the width of the HSS. In my opinion the l >= H notation notes the limit of applicability of the simple formula. #2 How do you know AISC would say no? Do you know of anything they've said on this topic? #3a...
  15. Mike Mike

    Shear Lag

    Human, I agree and you are correct. Compressive buckling controls member design, LRFD capacity is only around 140k. We have always just specified the rule of thumb minimum weld length for this scenario but I'm questioning our decision for 2 reasons. One, I want to improve myself, so I'm digging...
  16. Mike Mike

    Shear Lag

    Thanks JAE, I spent a half hour unsuccessfully hunting for that reference. I found "Guide to Design Criteria for Bolted and Riveted Joints" Kulak, Fisher, and Struik 2nd edition 1987 and skimmed thru it, but found no reference to our discussion. This appears to be a discussion of research by...
  17. Mike Mike

    Shear Lag

    Hi all, what is the minimum weld length for tension members? We are designing a ton of welded knife plate connections for HSS10x10x1/4 tension and compression braces. The LRFD tensile capacity is 371k. The LRFD axial load is +-100k, so we only need (4) 6" long 3/16" fillet welds, and we only...
  18. Mike Mike

    Do these deck beams look stable to you?

    phameng, I still didn't have time to dig into your links yet (doing real work over here), but came across another dropped beam. this one is probably fine right?
  19. Mike Mike

    What are the limits of prescriptive design?

    lex, Great find on the repeal of the 2006 wall anchorage requirements. Here's a screenshot of the 2006 code: 5" OC!!! quite a difference from 6', no wonder the powers that represent the contractors flipped, here's the movement to squash it: I have no issue with their conclusions. If they have...
  20. Mike Mike

    What are the limits of prescriptive design?

    lex, I can't find any Gnijolli on google, can you send a specific reference? I forgot about R602.3 and after re-reading it I agree with XR's interpretation: "studs shall be continuous ... to... foundation... floor, ceiling or roof diaphragm". I think you and XR are saying the same thing. XR was...

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