# Weight load for Steel Lid

• 03-12-2015, 12:45 PM
Marvinator
Hi. Im in the middle of designing a chimney cap which I will build myself. I am making the top and bottom out of ready made galvanized steel trash can lids. (Reason: cheap!)

I"m concerned in my design whether or not I will need to support the center of the top to take more weight (from snow and ice) The manufacturer says that the lids are made from 28 - 30 guage steel. If the lid is 21" round and only supported at the edges, what is the weight limit?
• 03-12-2015, 03:10 PM
Kelly Bramble
Equations and Calculator to determine stress, strain and deflection:

[B][COLOR=#000000][URL="http://www.engineersedge.com/beam_bending/circular_plate-bending.htm"]Circular Plate Deflection, Moments and Stress Equation and Calculator[/URL]

[URL="http://www.engineersedge.com/gauge.htm"]Sheetmetal Gage Size Chart[/URL]

[/COLOR][URL="http://www.engineersedge.com/calculators/section_square.htm"]Section Area Moment of In[/SIZE][/FONT]ertia Properties Square At Center[/URL][/B]
• 03-12-2015, 03:21 PM
Marvinator
Ok. Thanks. Did I say that I have no idea what I"m doing in this regard?
I filled in the calculator, but it seem to be saying the load is a -346...not sure I'm doing this right. LOL
But really thanks for the reply.

[QUOTE=Kelly Bramble;10583]Equations and Calculator to determine stress, strain and deflection:

[B][COLOR=#000000][URL="http://www.engineersedge.com/beam_bending/circular_plate-bending.htm"]Circular Plate Deflection, Moments and Stress Equation and Calculator[/URL]

[URL="http://www.engineersedge.com/gauge.htm"]Sheetmetal Gage Size Chart[/URL]