RE: Clarification: Per the Example Calculating Semirigid Diaphragm E'

Tiberiu Polocoser — Mon, 01 Nov 2021 16:58:51 GMT

Understood, thank you Seth. To reiterate, the E' that is calculated using this approach means to enter in the same plate thickness as the gauge thickness, but because this doesn't capture the out-of-plane stiffness that is present from the deck geometry you are saying to arbitrarily proportion components in the product t*E' to adjust for this.

Yes, the equation for the G is given in the example. By not giving the option to enter it you are making sure it is not inadvertently defined twice, also meaning isotropic properties. This is fine, just good for me to know.

RE: Clarification: Per the Example Calculating Semirigid Diaphragm E'

Seth Guthrie — Mon, 01 Nov 2021 16:43:36 GMT

For in plane stiffness what matters is E' and t (the product of the two). I often advise people to make the thickness more than the gage, while reducing E', so that the out of plane stiffness is greater (since this is related to t^3). You don't enter G directly, but it's obtained from Hooke's law give E and Poisson's ratio.