Horizontal Vessel Reactions

[Jeff Hinkle]

thread404-522383

Realizing now I should have posted this here.

I'm using the PIP guideline (STC01015) to develop a spreadsheet to design concrete foundations for horizontal vessels. I have included both working stress and strength design load combinations - working stress for soil design & strength for concrete design. PIP explicitly states that the thermal expansion load due to vessel expansion should be the lesser of 1) the force required to deflect the foundation an amount equal to the growth of the vessel (huge number) or 2) the force required to exceed the static friction force at the sliding end of the vessel. My question is, when using strength design load combinations - say 1.4D + 1.2T - should the thermal load I consider be mu*1.4*D or mu*D? Mu*D feels right, but mu*1.4*D would be the normal force for that load combination.

 

[dauwerda]

Load factors don't get applied until the end. Calculating the friction (thermal) load would use just the dead load (and content load), so a load factor of 1.0. You would then apply the appropriate load factor to each load type for each combination considered.

 

[Jeff Hinkle]

Thanks for the sanity check!