Modification For Wing-wall And Spill-through Slopes Kt

The ABSCOUR program calculates a Kt value based on the ratio of X1/X2 designated as SF in the equation below, (Click here for definition of X1 and X2)

For an abutment with a spill-through slope:

  Kt  = 0.55 +0.05 (1/(SF) - 1)
Where the shape factor (SF) = X1/X2

For abutments with wing-walls:

  Kt = 0.82 + 0.02((1/(SF) - 1)
Where the shape factor (SF) = X1/X2

For vertical wall abutments,

  Kt  = 1.0
For all abutments shapes, If SF<0.1, then Kt=1.0