foundation design for a 1000 ton press, what is the load? 6

[DavidStructural08]

Hi guys,

I ran into this foundation design for a 1,000 ton press. I am just curious what is the design load I should use:

I understand 1,000 ton is the press capacity. However, should I design the FTG for a live load of 2,000 kips???

 

[swearingen]

The 1,000 tons will be an internal load and will not be transferred to the footing. One caveat is if the load is applied very quickly and there are inertial loads. Other than that, the foundation should be designed for the weight of the machine plus what's being pressed.


If you "heard" it on the internet, it's guilty until proven innocent. - DCS

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[nutte]

Get the operating weight from the manufacturer. No need to second guess what the machine is doing.

 

[DavidStructural08]

Thanks guys.

I got this "equipment dead load of 100 kips plus 50% impact" specification. So I only need to consider 150 kips dead load in design? No more live load?

 

[baw1]

Get a copy of ACI publication 351.3R-04 "Foundations for Dynamic Loads". Also be sure to get all the information the manufacturer can give you including any special design parameters, as others have suggested.

 

[JStephen]

Do you have any photos or diagrams of the press? Normally, that's a machine with upper and lower beds, and that force is exerted between them, not between the machine and the foundation.

One example here:

http://www.youtube.com/watch?v=ppEy7wiOpYk

Note that the 4 posts are tension members, the ram is the compression member.

 

[PSlem]

http://www.slideruleera.net/foundations.html

 

[concretemasonry]

David -

The press capacity has little bearing (pun) on the foundation design.

If it is just the weight, it could be just a car or bunch of people.

If is dynamic and cyclical, where there are many cycles and vibration, that gets into a different world that really has little to do with the statics and structural design.

In my experience with heavy individual pieces of equipment (40,000#+) and cycling (6 - 10 cycles per minute and ramped up), the more mass you can prodive is well justified. The reason is that a few yards of concrete and the stability go a long way toward making the equipment operate correctly and last longer. Since this is an industrial situation, the extra construction cost is minimal if it leads to a better operation and reliability.

Just a "seat of the pants" observation.

Dick