Press Foundation Design - Dynamic Wt. versus Static Wt. 1

[Vilhelm]

Is is reasonable to assume that the dynamic (live) load component of a stamping press is equal 50% of the dead weight of the press with tooling (die)?

The owner has stated that they have used this 50% value on prior press installations.

For example,
press weight = 640 kip
die weight = 70 kip

static weight (dead load) = 710 kip

dynamic weight (live load) = 0.5(710) = 355 kip?

total design load (unfactored)= 1065 kip?

 

[MotorCity]

Vilhelm,

I recently designed a mat foundation for a 50 ton generator. The manufacturer specified that the dead load of the mat be equal to twice the weight of the generator to offset the dynamic effect. I have seen other manufacturers specify five times the weight of the equipment. I think it really depends on the type of equipment and the dynamic effect it produces. 50% may be ok for your application, but I would definitely get it in writing from the owner.

Good luck.

 

[jgailla]

SlideRuleEra has a paper concerning dynamically loaded foundations on his website SlideRuleEra.net. You may want to check it out.