Table 2.1 Summary of Deflection Basin Parameters
Parameter
Definition3
NDT Device13
Dynaflect maximum deflection (DMD)
DMD
=
d
l
d-d
1 2
d d
4 5
Dynaflect
Surface curvature index (SCI)
SCI
=
Dynaflect, Road Rater model 400
Base curvature index (BCI)
BCI
=
Dynaflect
Spreadability (SP)
SP
=
( Id. /56J x
100
Dynaflect
i=l to 5
SP
=
( Idi /4di) x
i=l to 4
100
Road Rater model 2008
Bsin slope (SLOP)
SLOP
=
d-d
Dynaflect
Sensor 5 deflection (W )
5
W
5
=
1 !)
d
5
Dynaflect
Radius of curvature (R)
R
=
r2/f2-dm[(Vdr)
-1]}
Benkelman beam
Deflection ratio (Qr)
Qr
=
r/dQ
FWD, Benkelman beam
Area, in inches (A)
A
=
6[ 1 + 2(d /d ) +
2 1
2(d /d )
3 1
+ (d /d )] Road Rater model 2008
4 1
Shape factors (F F )
1 2
F
l
=
(d d )/d
1 3 2
Road Rater model 2008
F
2
=
(d d )/d
2 4 3
Tangent slope (TS)
TS
=
(dm dxVx
a d = deflection; subscripts 1,2,3,4,5 = sensor locations; o = center of load; r = radial distance;
m = maximum deflection; x = distance of tangent point from the point of maximum deflection.
b The NDT device for which the deflection parameter was originally defined.
Source: Uddin et al. (120)