Forum Discussion
DrewE
Jun 08, 2018Explorer II
joshuajim wrote:Pangaea Ron wrote:
I'm baffled to understand how tire pressure would impact allowable loads to the concrete slab and compacted sub-grade below. So a 200 psi tire would transfer twice as much weight to the slab? It possibly
could, but the motorhome weight does not change nor do the dead loads to the slab which was the OP's question. The denser air of course would weight more, and the tire profile and footprint might change.
If 200#, then the contact patch would be 1/2. The OP question was ONLY if a 4000PSI slab would support his motor home.
To continue, the weight transferred would be the same, but the pressure applied would be higher; it would be more concentrated.
For actual tires, the relationship between contact area and tire pressure is anything but directly linear because they have considerable structure of their own and don't really behave like balloons. The stiffness of the sidewalls contributes a good part of the weight carrying ability (exactly how much depends on many variables, such as the sidewall height/aspect ratio).
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