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...
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...
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...
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.
Is there a way to find structural engineering firm with with specialist experience in house design? I ask because of my review of house design that appears to have some questionable design, but I am retired for a number of years so a review by a structural engineer with experience in house...
1. Have there been multistorey (I have in mind 7 suspended parking levels, serving a shopping mall) precast concrete garages built that satisfy structural integrity considerations (i.e. protection against "progressive collapse")?
2. If so, can you give some examples, and approximtely the year...
I have a document in microsoft word, where a line has been drawn. How do I find the start and end control points of the line? I want to delete the line, but to do that I need to find the start and end control points. The videos on line don't seem to help me, maybe they don't match my edition...
I am about to start writing a structural engineering report on the condition of an existing building, and I am wondering if there is a way of dictating to the computer, similar to the way I can compose a text message on an iphone. This would speed the report preparation process from the...
In applying CSA A23.3 Clause 13.12.5 Corner Reinforcement (see attached)in 2 way slab systems with stiff beams, how should the beam inertia be calculated when determining alpha α ? Should it be based on the rectangular beam dimensions without the slab, or should it be based on the tee beam...
In the Canadian Standard CSA A23.3 1984 the commentary N13.4.9.1 explains that the structural integrity bars in two way slabs (such as flat slabs) act by "catenary action". In the 2014 edition, the word "catenary" is deleted (the clause is numbered N13.10.6 in this edition). See attached...
Does anyone have a recommended horizontal reinf for curbs, exposed exterior conditions, and not exposed (i.e. within the conditioned building space)? I ask in reference to a typical detail for curbs that I am developing.
I notice municipal curbs have a corner radius ( I also see that these curbs are sometimes extruded from a continuously moving machine). Does anyone know the amount of this radius so that I can specify it on a typical detail for curbs that I am developing?
For a reinforced concrete curb which is dowelled to a reinforced concrete slab, is there any point in putting in sawcut control joints (say at 6 m o/c)? Will the doweling prevent the movement that the control joints are intended to permit, or do the control joints nevertheless provide some benefit?
Are studrails that are used to increase slab punching shear capacity around supporting rectangular columns, best placed radially or orthogonally around the column? It seems to me that I read an ACI paper a number of years ago that said they were most effective when placed radially. It may even...
CSA A23.1 clause 6.7.5.4 says:
"unless approved by the owner, embedded pipes or conduits shall not be
(a) larger in outside diameter than 1/3 the thickness of the slab, wall, or beam in which they are embedded;
(b) spaced closer than 3 diameters on centres; or
(c) so located as to impair the...
The brick masonry mortar joint thickness in buildings built in the 19th century is generally relatively relatively thin, compared to buildings built in most of the 20th century, at least in my area of practise in Ontario. I believe this is related to the lime mortar that was generally used at...
Given:
An existing installation consists of 3 large commercial laundry driers sitting on a 5" ± thick
housekeeping pad which in turns sits on a 5" (125 mm) thick slab-on-grade reinforced with welded steel wire mesh. The driers are not bolted to the housekeeping pad. The driers are in a...
CSA A23.3:
Openings in 2 way slab systems without beams I believe similar clauses appear in ACI 318:
Why do clauses 13.10.10.3 and 13.10.10.4 say:
"An amount of reinforcement equivalent to that interrupted by an opening shall be added adjacent to the sides of the opening"
whereas clause...
Given:
Need to store boat over the winter, in boathouse. The boat will be supported on 2 beams, that span 14 feet on centre. Owner tells me that boat weighs 3500 pounds (seems a lot to me) and that I should assume that two-thirds of the weight is on one beam only i.e. 2333 pounds point load at...
