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Recent content by onteng

  1. onteng

    Roof Loading

    This is pretty common in Ontario, particularly in urban areas. The local municipality governs whether storm water management is required on a site. Although there are site related solutions, typically we are asked to have stored water on the roof. The Ontario Building Code has a checklist to...
  2. onteng

    Converting old drawings

    We have used raster image in the past with mixed results. For smaller renovations or additions it worked okay. Problem is, even if you get the scale worked out, the drawings are hand drawn and therefore errors will be evident. The other problem is the speed. We found that raster images make the...
  3. onteng

    Load testing

    Ron, thanks for the testing input. I will discuss this with the company overseeing the testing. I had discussed this testing previously with the engineer from the firm who recommended it. At that point, he felt the load testing may not be practical. I think the final say may have been taken out...
  4. onteng

    Load testing

    Thanks for all the replies. If the problem with load sharing is eliminated, I still see problems. The webs are very thin with no web stiffeners and I am concerned that they buckle and cause collapse. I one frame collapses, it may pull the other frames down. At this point I am not sure how they...
  5. onteng

    Load testing

    We have completed an analysis of an existing pre-eng building built in 1975. The frames were overstressed by 150% under unbalanced loads. The purlins were overstressed by over 100% under normal snow load and finally the girts were overstressed by 100% under wind. Once reported to the client, two...
  6. onteng

    Minimum reinf. for slab-on-grade

    For smaller frames, we have specified hairpins with wire mesh reinforcing in the slab. For larger frames with larger thrust reactions, we prefer continuous ties between the piers below the slab in a concrete duct. If you are concerned whether the slab should be reinforced as a structural...
  7. onteng

    Shoring of Masonry for Lintel Installation

    Beyond the numbers, you need to visually inspect the existing wall. A weak bonded wall such as old brick composite walls or clay tile may be problematic. Irregardless of the method employed, some cracking or dislodging of masonry should be expected. If needling is used,specify a beam that will...
  8. onteng

    Interior Bearing Walls

    Offsetting the trusses is still the cheapest solution. Alternate measures to review may be metal truss enhancers. I know Simpson Strong-Tie has this type of connector which provides uplift resistance and also increases bearing capacity. You could also indicate truss scabs at the support points...
  9. onteng

    Periodic Review?

    Ron As I stated earlier I can not do that. In Ontario, the PEO (Professional Engineers of Ontario) is a self regulated profession enacted by the province. The PEO has published regulations in which professionals are bound by. The wording "periodic visits" are direct quotes from the PEO...
  10. onteng

    Water rise in concrete due to capillary

    Check out the Portland Cement Association store web site. They have made available a new publication 'Concrete Floors and Moisture'. Just got my copy today and haven't had a chance to read it all. My biggest concern was vapour movements through the slab and its relationship with flooring...
  11. onteng

    ICF Walls

    Thanks for your posts. The systems we are looking at are open throughout except for the ties. They indicate in their specifications maximum 4'-0" lifts and vibrated using a small pencil vibrator. This seems adequate and may have be written in based on past problems. I agree that even with the...
  12. onteng

    Periodic Review?

    Thanks for your comments. Ron, the items in quotes in my original post including 'periodic review' are directly from our Professional Engineering Association of Ontario regulations. Not like we can strike or amend the wording. The wording is exactly the reason for this post. It troubles me how...
  13. onteng

    ICF Walls

    We have just started design of a large institutional project in which the architect wants to use ICF (Insulated Concrete Forms) Walls. Our initial reaction was positive since we would be designing basically 8" solid concrete walls. However we have since heard 'horror' stories about recent...
  14. onteng

    Periodic Review?

    During the construction of a project we are regulated to "provide periodic visits, on a rational sampling basis". Some trades such as structural steel or wood framing are fairly straight forward since we can see it on a reasonable schedule. The more difficult decision comes for concrete...
  15. onteng

    Columns with no base plates

    I would weld a clip angle on each side of the column in the plane of the stud wall. Anchorage to the slab could then be achieved and bearing taken through the angles.
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