Required Mesh for Plate Analysis
Required Mesh for Plate Analysis
(OP)
I have modelled a 10 ft by 10 ft concrete plate with a hydrostatic load to verify the output against plate formulas in "Roark's Formulas for Stess and Strain" So I can apply to a concrete tank model. Using the quadmesh tool, I need about a 3" mesh before results seem to converge.
Is this reasonable? I am new to Risa. The tank I need to model is 212 ft by 50 ft x 25 ft, so a 3" mesh makes a huge model.
Thanks in advance for any help.
Is this reasonable? I am new to Risa. The tank I need to model is 212 ft by 50 ft x 25 ft, so a 3" mesh makes a huge model.
Thanks in advance for any help.





RE: Required Mesh for Plate Analysis
RE: Required Mesh for Plate Analysis
When you say "reasonable results" do you mean the results are close to published plate results?
RE: Required Mesh for Plate Analysis
RE: Required Mesh for Plate Analysis
RE: Required Mesh for Plate Analysis
Thanks for the help.
RE: Required Mesh for Plate Analysis
Instead, you will get a gradual degradation of the results as you get larger than the 3 to 1 ratio. But, it should be gradual. Not like in the old days (1970's elements) where you'd get "shear locking" and your results immediately turned to garbage when you exceed their thickness limit.
That beins said an 11 to 1 ratio certainly exceeds the limit by a significant amount! Hence, I'd be very, very cautious about using a ratio that large.
RE: Required Mesh for Plate Analysis
Instead, I like to look at deflection to determine convergence. I usually use about a 10% convergence rule. If I can sub-mesh 2x2 and the max deflection changes by less than 10% then I feel like I have converged.