Determination roof plate thickness

Dear All,

I am designing the roof plate thickness for downward loading .

Roof type - Fixed roof - Self supported
Tank Dia - 3200 mm
Tank Height - 4575 mm
Existing roof plate thickness - 6 mm
Live load - 122 Kg/m2
Vacuum - 25.4 Kg/m2.
Piping and valves weight - 70Kg.


In existing tank roof some additional weight (piping & valves) are added, for that i have to calculate the roof plate stability.

I have considered load combination as follows,

Corroded weight of roof plate + live load + 0.4 x Vacuum + load due to Piping and valve arrangement.

how to calculate the roof stability for above said load combinations.


Thanks in advance
S.Siva

Hello sivastatic

Would it be possible for you to go through our customer support system (created an SR). You could then send me the file and I can try an figure something out.