Slab on Grade - Crane Loads
Slab on Grade - Crane Loads
(OP)
Does anyone have any resources for checking the capacity of a slab on grade for crane loads? ACI commentaries only discuss vehicle loads, which are lower and long term.
I need to check a one-time 160 kip axle load (putting up tilt-up walls) but am unsure how to check the slab.
Thanks
I need to check a one-time 160 kip axle load (putting up tilt-up walls) but am unsure how to check the slab.
Thanks






RE: Slab on Grade - Crane Loads
RE: Slab on Grade - Crane Loads
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RE: Slab on Grade - Crane Loads
RE: Slab on Grade - Crane Loads
Solving loading conditions under an outrigger is more complicated. However, a great way we got out of determining this was we placed the entire weight of the crane + weight of object + weight of rigging on one outrigger, and calculated the loading by a 4’ x 8’ oak timber (we usually used 12” thick oak timbers). This is conservative, but if it exceeded the concrete’s strength………a great source of reference is “Cranes and Derricks” by Shapiro. It lays out the required formulas regarding C.G. of the boom, etc., that is needed to accurately solve your problem. But it will take some time and you may not be able to get all the info you are wanting.
One last thing, in the book it talks about the effective length of your oak mats. This basically deducts the amount of area your able to spread out the load….if you have a 4’ x 8’ mat, the effective area could be say 4’ x 6.5’.