FEA Plate stress
FEA Plate stress
(OP)
I have run Concrete element as FEA on Strand7, the C40/50 concrete is surrounding Slot made of Iron, and the load 900 kN . My question is how to check the results of plate stress whether are they correct or not ? The maximum results for Plate stress are XX 135 mpa, yy 115 mpa and xy 48 mpa.
Many Thanks
Leo
Many Thanks
Leo






RE: FEA Plate stress
1) Find an approximate had calculation to verify your numbers. Perhaps something from Roark's stress and strain formula book.
2) Compare output with another software package that you know well.
3) Refine your meshing in intervals to gauge sensitivity to element size.
4) Check overall equilibrium of the applied loads with the computed reaction.
5) Ensure that the displacements and stresses are consistent with your intuition.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: FEA Plate stress
Thanks
RE: FEA Plate stress
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: FEA Plate stress
Many thanks
RE: FEA Plate stress
1) general purpose concrete design texts that cover two-way slab design.
2) verification manuals for SAFE or whatever software you're using.
I don't have a canned example to share I'm afraid.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: FEA Plate stress
RE: FEA Plate stress
Not unless you're attempting to design plain, un-reinforced concrete which would be unusual. There aren't really "allowable stresses" in the traditional sense in modern reinforced concrete design. You simply proportion your cross section and specify your reinforcing to supply the required, ultimate flexural capacity.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: FEA Plate stress
It sounds like you are not familiar with reinforced concrete design, so I would suggest refreshing the basics of that before going too far with the analysis. As noted by KootK, you will need to extract bending moments and shear forces (and axial forces if the loads are in-plane), and calculate the concrete compression and steel tension from that.
But that said, if you have modelled the element correctly the maximum compressive fibre stress from the model will be of the same order as the maximum compressive stress in the concrete, so if you are getting 135 MPa, that is way too high for concrete with a compressive strength of 40 MPa.
If you would like to upload your .st7 file I would be happy to have a quick look at it.
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: FEA Plate stress
RE: FEA Plate stress
My question is if the maximum stress is less than the Compressive strength which is 40 MPa, then the results are reliable?
Many thanks
RE: FEA Plate stress
But if the strain is less 0.003, concrete crushing shouldn't be an issue.
RE: FEA Plate stress
Many Thanks