TABLE 1
THE AASHTO RIGID EQUATION IS AS FOLLOWS:

 

		(-0.079)		[	( 2.783 ) J	(	D 0.75 - 1.132	)]
Log (10220 x trucks/day) =	7.35 Log (D+1)-0.06+	1+ 1.624 x 10 7	+ 3.58 Log				D 0.75 - 18.42
		(D+1) 8.46					[  3.9 x 10 6 ] 0.25 K

VARIABLES

Assumed:   4000 psi (28 day)

   20-year life, 1.4-18 kips per truck

D=    Depth in inches

J =    Load Transfer

          2.2   Continuous Reinforced Concrete

   3.2   Load Transfer – Doweled Joints

   4.2   No Load Transfer

K=   Modulus of Subgrade Reaction

   100 for most Strongsville’s subsoils

      K may be increased for aggregate bases

      K shall be decreased for poorly compacted soils