Axel road load

[crfaccin]

Dear Mostafa, i didn't understand how the axel road load is consired. Can you help me?

[Mostafa-Nakhaei]

Hi, there is no axle load. The program only take into account the single tire as the original method developed based on a single tire.

[PeteTam-js]

Dear Mostafa, i didn't understand how the axel road load is consired. Can you help me?

**Here you go @crfaccin :
If 18 kips (80kN) is the axle load for single axle single tire configuration, then the load on the each tire is 9 kips (40 kN).

If the tire pressure is 80 psi (552 kPa), and assumed that the contact area between the tire and pavement surface is circular, then the circular contact area =9000 lb/80 psi = 112.5 sq in. = the circle with the radius 6 in (150 mm).

Then, you will use q = 80 (note that it is pressure in psi, not load @Mostafa-Nakhaei - you may update this ) and a= 6 (radius in inch) in the code**