How do I solve a 3D problem involving a trailer and wheel sizing using statics?

[Mechaman]

Hi all, I have a problem with a 3 wheel trailer and sizing the wheels. Using statics, how would I solve this 3D problem by breaking it down?

The trailer is sitting on rectangular section and a plate on top carries an even load of 3500kg (roughly 35kN)

If I take a cross section A-A and try and find the load wheel B is under, there is nothing to support it. I'm not sure how I would approach this problem?

Problem attached: https://imgur.com/Pf0tfKH

 

[scottdave]

Since it is static, you can sum the moments about a particular point equal to zero. Then all forces acting on the trailer must sum to zero. You will have some equations to solve for the different unknowns.

 

[scottdave]

What happened to the rear axle (A) on the bottom diagram?

 

[Mechaman]

What happened to the rear axle (A) on the bottom diagram?

Would the axle be considered the same as wheel A when looking at it in section view?

 

[scottdave]

Yes, that section is supported at point where wheel A is. Think along the same lines as you being able to collapse the entire rectangular plate down to a single line with the 35 kN.

 

[Mechaman]

Yes, that section is supported at point where wheel A is. Think along the same lines as you being able to collapse the entire rectangular plate down to a single line with the 35 kN.

Great I think I understand now. Thanks for the help.