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Vibratory noise when vehicles pass over the steel grating sections over a trench drain: I would be interested in possible way(s) to stop or reduce the noise produced when cars and other vehicles cross the grating sections that span across a trench drain. There are 5 grating sections each 8±...

The following is a continuation of an earlier post of mine, but I don't know how to put it in that part of the forum. Is there anything in the Ontario Building Code (or any other generally recognized Code, preferably Canadian or Northeastern U.S. Code) that says that if a product based on a...

I recall that when I was starting out in 1964 that we used what were called "Tin pan joists" which were concrete joists formed with removable steel pans. Eventually Joist systems were abandoned as a system because they were not as economical as other systems.(Before 1964, the joist system used...

Within about the last year, I raised the issue I think in this discussion forum about the pros and cons of using a sheet of fiberglass (6 foot x 4 foot ±) as a material to cover graves in a cemetery. The fiberglass would be placed at grade level (not at casket level). If the graves are to be...

Where I worked from my graduation from university about 1965, up to about 2017 (I partially retired about 2006; fully retired about 2017), our shop review drawing stamp was changed to remove the word "approved". This was after we asked a law firm to review our procedures, documents, etc., and...

LOL

To dauwerda - thanks very much for your comment. Very interesting indeed that you have found pictures of fibreglass covers with holes at each corner, presumably to insert some sort of hold-down anchorage to keep the fibreglass cover from blowing away. Why do you think that holes in each...

I will drop the matter now, following your wise advice. I was just trying to see if anyone could come up with a good reason for fibreglass cover panels.

If anyone has other sources of data that might be useful for this please don't hesitate to post them. The only other way to determine what I seek is by a boundary layer wind tunnel like I recall they had at the University of Western Ontario, but I have lost track of them, and anyway I dont think...

Looking at the NRC 1995 - CNRC User's Guide- NBC 1995 Structural Commentaries (Part 4): CpCg: From Commentary B, Figure B-9(a) External peak pressure coefficients, for roofs of 10° slope or less for design of cladding and secondary structural members I read the value for CpCg of about...

I remember this question being around from time immemorial, such as from before I retired. I believe that the general thought was that the minimmum area of welded wire steel mesh was not only unhelpful in slab-on-grade; it was counterproductive, and it was better not to put it in, because it...

TYPO: should say "I am told by a friend that he has seen fibreglass panels over some graves."

Does anyone have any advice on what the wind uplift suction (kPa or psf) on a cemetary grave fibreglas cover at ground level might be? The environment would genrerally be suburban or rural, although it could be urban depending on where the cemetary is located. I am told by an friend that he...

to phamENG - thank you for your reply. What you say sounds logical Much appreciated.

thread507-310737 I have not been on this forum for some years. Nevertheless a question has recently arisen, that I seek to comment on, and woud like to hear engineering connents on, viz. Someone on the cemetaary ccommittee at the place of worship that I attend, has proposed covering each new...

Thank you everyone. Interesting answers. I have not been on this system for quite some time, so it is great to see the names that I used to see, like BARetired who I recall generally held similaar thoughts as I, and I recall kindly defended me when someone sought to mock. Stay well everyone.

In otherwords, a floating slab seems to be what I used to in my younger pre-retirement days decades ago, call a slab-on-grade or slab-on-earth. Right?

What is the definition of a "floating slab"? Is it a slab that is supported throughout by soil ( versus a "suspended slab" that is reinforced to span between supports such as driled concrete piers founded on natural undisturbed soil of sufficient strength to support the load.

In my opinion, corrosion was not a significant cause of collapse. Also lack of floor slope was not a significant cause of collapse. If water containing corrosive chlorides runs over the floor over many years, and the floor has no membrane protection, the concrete will absorb the chlorides...

I do not know to what extent rebar corrosion may be a significant factor in the collapse, but am somewhat doubtful, unless there are areas where the deterioration is much more than the photos that I have seen to-date, although I did see one photo where the delaminatio was horrendous. I have seen...