Truck wheel disperion angle in slab 3

[tipsabc]

Try to justify the truck wheel load dispersion angle as 1:1.5 (vertical:horizontal) in concrete slab. Where can I get the reference? Thank you.

 

[Ron]

That's probably close. Can't recall a reference on that other than Yoder and Witczak.

You can compute using an elastic layer analysis program (ELSYM5 or similar).

 

[JStephen]

"Formulas for Stress and Strain" shows a load case for square or circular load areas on a semi-infinite body. However, they don't show a load distribution, just the maximum stress in the semi-infinite body. Anyway, the reference for those is Timoshenko & Goodier's "Theory of Elasticity". Don't be surprised if getting stresses down in the body requires evaluating series expressions.

"Structural Engineering Handbook" mentions a 30 degree distribution, then refers to Newmark's influence chart, based on Boussinesq's equation (which is presumably what is in Timoshenko's work above).

 

[whymrg]

According to Fig. R10.17 p. 132 of ACI 319-99, this angle might be 1 vertical to 2 horizontal.

Good luck.

 

[tipsabc]

whymrg,

It should be ACI 318-99, right? Thank you.

 

[tipsabc]

Thank all of you. I appreciate it.