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  1. Craig_H

    Interesting ponding/deflection problem

    It appears to me that you've derived Equation (1) from Commentary H of the NBC Structural Commentaries: Interesting to know that this equation is based upon a massless structure. If my understanding is correct, this equation would be slightly underconservative if we account for the mass of the...
  2. Craig_H

    Odd Wood Connection

    I'd also be open to a couple of structural screws or even lags loaded in withdrawal, holding a unistrut to the underside of the joist. It would be nice and minimalist. You won't need a ton of thread engagement to get 300 lbs of tension resistance, but it wouldn't be onerous to use long enough...
  3. Craig_H

    Residential- Curved Stud Walls

    Quoting from your website: "bending plywood, is normally made out of hardwood imported veneers with the layers all running in one direction". It would therefore not be considered a wood structural panel. I also imagine that a curved exterior shear wall would exert all manner of odd diaphragm...
  4. Craig_H

    Moment Frame on Asphalt / Wheels?

    I used to work in the specialized rigging, crane, and heavy haul space. We had hydraulic gantries like this: Granted, the use case was a bit different: every use had to have an engineered drawing with the specific equipment arrangement, operational limits, etc. Pretty tightly controlled and...
  5. Craig_H

    Du-Al Beton Concrete Joist System - Literature Anyone?

    Hi all, I'm working a building that was originally built in the mid-1970s and that has a main floor composed of 8" Beton (inverted T) Precast Concrete Joists infilled with Du-Al Blocks, which I have deduced were an interesting floor & roof framing system manufactured by Du-Al Blocks in...
  6. Craig_H

    Forces on Moment Connection for LDMRF (CSA S16 Clause 27.4)

    Seismic in steel is not in my wheelhouse. Have you considered 27.10 Conventional Construction? I believe there's a careveout allowing connections to be designed to resist gravity loads + seismic loads multiplied by Rd. That would effectively allow you to design your connections for a load...
  7. Craig_H

    wheel loads on heavy timber decking

    Forestry road bridges in my area have timber decks. They are typically two layers: one transverse spreading load to the bridge girders, and a second layer longitudinal which provides some additional load spreading and also functions as the wear surface. Most in my area would be as you...
  8. Craig_H

    2x4 Floor Truss

    I had a supplier propose this once. Their explanation was that their tooling couldn't accommodate lumber on its edge on their press table. I'll admit I didn't quite understand why that would be the case, but just went with another supplier who could fabricate the trusses as-normal.
  9. Craig_H

    Engineering Design 'Stack'

    Keep in mind that I am a small one-person shop and keep my software lean as a result: Frame Analysis & FEM SAFI GSE. I sometimes feel like I am the only one using this, but it works well for me. Building Climatic Loads Jabacus. Buddy started charging and he should considering how quickly...
  10. Craig_H

    Seismic Design of Mid-Rise Buildings with Heavy Rigid Floors and Light-Frame Walls

    A little over a year ago, I came across a 4-storey residential building composed of concrete hollow-core plank on light wood framed walls. Many things about the building struck me as odd. It is a combination of materials that I feel is fundamentally flawed. In my case, the building had...
  11. Craig_H

    Gable Frame w/o vertical

    Can you hang the ridge onto the wall-truss using a hanger? Perhaps a simlar to a Simpson CBH or the euro originals that it is a copy of? Regarding the frame and its connections, mortise & tenon connections can often work well. Below example was buried in the wall and is therefore PSL. I was...
  12. Craig_H

    Log cabin Roof Framing

    Wow. I can't say that I've ever engaged in the engineering discipline of "remove it, observe deflection, then add a support based upon that". I'm genuinely curious, how do you plan to size the new support columns without knowing the magnitude of load applied to them?
  13. Craig_H

    Log cabin Roof Framing

    I see a half-lap joint in the ridge beam directly above one of the 8x8s you plan on removing. I wouldn't be taking it out. Having designed these types of fire places, there are definitely cheaper ways to laterally brace the wood stud framing than by adding 8x8 columns. Your justification for...
  14. Craig_H

    LEDGERS ON ICF WALLS

    How much concrete is above your ledger? In the past, I've had the contractor cut out the foam at the interval of the ledger anchors, and form the face with plywood. Plywood can easily be made from scraps and screwed to the plastic webs in the ICF blocks. This left exposed concrete with...
  15. Craig_H

    Information for Wood Log Beams and Trusses

    Definitely a niche and very complicated. I've had the privilege of designing a few log buildings. General tips: [ol 1] I collaborated with the log craftsman. It's truly a craft and the craftsperson's style is likely to drive the truss form. I'm in Canada and my wood code (CSA O86) has...
  16. Craig_H

    Attic Truss - Floor Sheathing Flat Diaphragm

    I seem to remember asking the same question a while back. Recommended solution was to sheath the vertical webs and provide blocking at the web-to-top-chord joint. See this: https://www.eng-tips.com/viewthread.cfm?qid=475689, and KootK's excellent diagram copied below for convenience:
  17. Craig_H

    New Brunswick Structural Engineer Trouble

    I think that it's relatively safe to guess that this transfer slab is loaded to a UC of more than 1.04 (or whatever number you want to argue the semantics of). The regulator is using "serious deficiencies" in its statements, and I doubt that term is being swung around carelessly. Service level...
  18. Craig_H

    Lag Screw Withdrawal from Top of LVL

    If this is a multi-ply LVL that you are fastening to, could you not have a knife plate between the plies with dowels through the LVL? Knife gets stabbed into the column above. Not much fabrication apart from cutting a plate and drilling a few holes. That's about as concealed as you can get...
  19. Craig_H

    National Building Code of Canada - Noncombustible Construction vs Insulated Metal Panels

    Interesting find with the Kingspan K-roc. As it's filled with mineral wool, I'd be confident saying that's non-combustible. While it may be possible to argue that an insulated metal panel (with flammable foam inside) is non-combustible because of the steel wrap, I don't see it as following the...
  20. Craig_H

    Canadian Single Family Housing, do foundations need reinforcement

    Take a look at Table 9.15.4.2.-A

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