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  1. catsndogs

    Wood Roof - Thrust

    The Engineering Guide for Wood Frame Construction (Canadian Wood Council) provides solutions for this. Includes nailing requirements. Easy to follow.
  2. catsndogs

    1913 One-Way Slab

    The normal live loads on a wharf are far greater than anything in the building code. And I imagine that the slab you're looking at is massive. Commentary L of NBCC would allow a structural assessment based on satisfactory past performance. That doesn't mean you can add concentrated loads...
  3. catsndogs

    Acceptable failure rate for glass

    It depends what values of m and k you use in the glass failure prediction model, of course. In the Canadian standard, the relationship between stress and breakage rate is prescribed, and is evidently based on different m and k values than you have used.
  4. catsndogs

    Acceptable failure rate for glass

    Isn't that the trap that designers fall into? Designing for the maximum stress at the extreme fibre of the glass section, like it's steel. Aren't the glass flaw parameters (m and k) exactly what their name suggests? An indication of the surface flaws that initiate glass failure, even in areas of...
  5. catsndogs

    Acceptable failure rate for glass

    Designed for the full factored load with one ply broken? How have you established such a low breakage rate for glass on your projects? (ie 8 in 1,000,000) Based on tests of glass from a specific supplier, with specific glass flaw parameters, m and k? Based tests of prototype assemblies? Others...
  6. catsndogs

    Acceptable failure rate for glass

    For a glass structure without redundant load paths, "crack" means "break", and "break" means "collapse". For a laminated glass floor, the failure of one glass ply under static load will create a shock load in the remaining ply (or plies). Canadian codes identify an analogous problem in lightly...
  7. catsndogs

    High moisture content in concrete slab on grade

    I assume that you're posting because the drying time for this slab is significantly outside the norm for your projects, your area, and the site conditions. So, notwithstanding what was specified... Are you sure that the vapour barrier is there? Is it a material that is not easily punctured by...
  8. catsndogs

    Slab on Grade

    They tires have to get into the building. Won't the wheel loads of forklifts be ***much*** more significant than the uniform load of stacked tires? Design charts are readily available for slabs on grade subjected to wheel loads. But at 5" thick, your slab might be just outside the scope of many...
  9. catsndogs

    Acceptable failure rate for glass

    I think you're looking at the problem in reverse. Glass design for windows has always been based on breakage rate. But structural design of everything else is based on reliability. For example, you wouldn't say that steel has a 1% chance of yielding; you'd say that it has a yield strength that...

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