Calculation of crawler crane ground bearing pressure?

I am looking for sample calculation that details the steps for estimating the ground bearing pressure exerted by a crawler crane when lifting a load.

Ground pressure is most meaningful (to me at least) when it is measure in pounds per square inch.

An example:

A loader weighs 5000 lbs and lifts a 2000 pound load. The load is distributed on four tires with 150 square inch ground contact per tire.

5000 lbs + 2000 lbs / (4 x 150) = 11.7 ponds per square inch

This assumes the tires are bearing weight equally (which they don't), but you can probably see ahead to how you could estimate the weight carried by a front tire versus a back tire.

The other assumption is that the tire or bearing surface is smooth (which it isn't). Considerably more pressure is exerted by the cleats of a tire than by the recessed surface.

Another interesting calculation:

A 200 lb human with a 25 square inch foottrack/shoe print would exert 8 psi force on the ground when standing on one foot.

Keep in mind that static force is considerably different than impact force.

The answers post by the user, for information only, does not guarantee the right.

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