Steel Plate Check
Steel Plate Check
(OP)
I have a trench that spans 7 ft. and a steel plate is needed for a load of 16 kips plus impact. I need to check if a 1.5 thick plate works. Also how to get the stresses? Any suggestion? The plate is free at two ends and simply supported at the other two. fy = 36 ksi.
Thank you
Thank you






RE: Steel Plate Check
RE: Steel Plate Check
I've yet to find a good reference for yield line analysis, so maybe that helps you out enough to make it work. Do you know of one CanWest?
But my gut feel (without yield line) is that 7' is too long a span for 1-1/2" A36.
RE: Steel Plate Check
RE: Steel Plate Check
RE: Steel Plate Check
Back checking the stress with a simple-span model, it's about what I would expect to get if about 7' of the plate was engaged to resist the (developed) moment.
A critical condition occurs when the plate is loaded near a free edge (@ mid-span). In that case, you have stresses more than twice what I quoted. Not sure if that can happen in your case.....but wanted to advise.
RE: Steel Plate Check
Did you mean to say simply supported on the long sides, free on the short ends?
BA
RE: Steel Plate Check
RE: Steel Plate Check
Dik
RE: Steel Plate Check
http://wsmurti.lecture.ub.ac.id/files/2012/10/Perencanaan-Praktis-Garis-Leleh1.pdf
RE: Steel Plate Check
RE: Steel Plate Check
The nature of the impact has not been given; the impact factor cannot be determined with precision.
BA
RE: Steel Plate Check
Yes public traffic loading.
IM = 1.3
RE: Steel Plate Check
http://www.amico-grating.com/heavyduty.htm
RE: Steel Plate Check
How can this be? If true, the span of the plate is 15'-0" which does not make sense.
Are there additional supports at each edge of the trench? In that case, the plate is not a simple span.
Perhaps a sketch showing the 15x8 plate and the location of the supports would be helpful.
BA
RE: Steel Plate Check
RE: Steel Plate Check
BA
RE: Steel Plate Check
http://www.nceng.com.au/
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning."
RE: Steel Plate Check
You're correct jayrod. The trench is 7ft by 18ft and the trench plate is being placed in a way that 15ft spans over the trench so 4 feet is pass the trench on each side. Couple plates are needed to cover the trench. Hope that helps.
RE: Steel Plate Check
RE: Steel Plate Check
RG4 -- since the plate overhangs each end, it's worth talking about what is at the edge of the trench. Is this an excavation across a flexible pavement (asphalt) or soil that might lead to an effective span longer than 7'? Or is there concrete or a braced element that will keep the point of support rigid at the edge of the trench?
RE: Steel Plate Check
the Excavation is on dirt and is only 6 ft wide but since it is on dirt you are right the span is longer which is why im saying the trench is 7ft but rather the span is 7 ft.
Would yield line be best to use?
RE: Steel Plate Check
The most critical condition occurs when the load is applied at or near the edge of a plate. A "couple" of plates will not cover the trench in the orientation described above. Three plates would be required to cover a 6'x18' trench. It may be a good idea to place one plate centrally on the trench and allow the other two to overlap 2' on each side, leaving a 4' gap in the middle. This would ensure that neighboring plates share the load while mutually covering a 20' length of trench.
Yield line theory is likely best for determining the capacity of the plates.
BA
RE: Steel Plate Check
Thank you everyone for their help.
RG4
RE: Steel Plate Check
If you are interested in service stresses or deflections, you might want to use a somewhat smaller effective width, depending on where the load is located relative to the middle of the plate, perhaps about 6'-0" would be about right for worst case positioning.
BA