Dutch design method - ICPA

Dutch design method – Traffic load stressesEdge loading most critical:. centre of longitudinal edge/joint (temperature gradientstresses). wheel track at transversal joint (no. of load repetitions)‘New’ Westergaard equation for circular tire contact area:( υ )( υ)33 1+ Pcal⎧⎪⎛ Ech ⎞ 4 1−υa⎫⎪σ P = ln1.84 1.182 ⎨ ⎜4 ⎟ + − υ + + ( 1 + 2 υ)⎬π 3+ h ⎪⎩⎝100 k a ⎠ 3 2l ⎭⎪Due to load transfer W at joints/cracks:WPcal( 1 1/2 W /100)P ⎛ ⎞= − = ⎜1−⎟ P⎝ 200 ⎠Values of W given in paper26 October 2009 38