Recent content by mountaineers19

Thank you very much for the input!

Slab details are thickness ranging from 6-14 inches depending on the area with 66-44 WWF reinforcement. Compressive strength from samples has been anywhere from 5000 psi in the 14" section to 7000 in the thinner areas. Soil bearing capacity was stated at 4000 psf minimum in the 70s and the crane...

Gotcha, so in this case there are areas where they have a heavy duty slab acting as a spread footer would this still be the case?

Wouldn't my effective area when checking the bearing pressure on the soil below be limited to the area of the baseplate plus the 45 degree projection from bottom of baseplate to the soil?

Correct, the concrete came back with a much higher compressive strength than anticipated and passed punching shear so i was more curious about the effects of the limited effective area I have on the soil bearing capacity with the 25% weight increase.

Passes punching shear and is a spread footer. But someone did raise the point of this being an older construction that it has had 20+ years of soil consolidation which does help. One of my main concerns was the soil bearing pressure due to this not having a large effective area.

Dude I know computer models are not end all be all. Reason I posed the question was to get feedback or other alternatives. I never said I believe this will work 100%, I wouldn’t be posing the question if I was. I really do appreciate your feedback. I was more pointing towards the question for...

I think I may have been confusing with my wording for my question. The steel for this system is good for the load increase but the foundation is not. I'm in a situation where doing concrete work is to be avoided if at all possible so my thoughts are to somehow increase the effective area for the...

There are plates at the top of column and top of runway braced back to the building column to resists axial loads from the crane.

No issue is the increase in axial load transferred from the column to the foundation. 50 foot runways and and roughly 47.5 feet wide.

Apologies I just threw that together real quick for visual purposes.

Unfortunately no due to spaces requirements for aisle ways.

The column is indeed under capacity

I am trying to find alternatives to increasing the capacity of this crane without messing with the foundation if I do not have to. I know the foundation is good for the current loading and according to my model this brace would handle the additional load and help disperse it on a larger...

When designing a WF column where the bottom 1.5 feet of it is going to be encased in concrete do you take the unbraced length from the baseplate to be conservative or is it okay to take it from the top of the concrete to try and trim down the column size?