Pipe Monorails - Local Stresses

[alex_mech_12358]

Hi,

I'm designing an aluminium pipe monorail. I'm struggling to find any guidance on local stress checks at the trolley wheels. I'm familiar with the normal I beam monorail bottom flange stress checks but not sure what to do for a circular hollow section where the trolley wheels ride along the 10 and 2 o'clock positions.

Has anyone seen any references or design guides dealing with this application?

Thanks