In the LRFD code the fatigue shear resistance (Zr) is computed by
Zr = alpha * d^2 >= 5.5*d^2/2.
Where
alpha = 34.5-4.28 * log N
and N = number of cycles over a 75 year design life.
Rearranging, when N > 115,000,000 alpha = 0
So...
When the design N > 115,000,000 do you just use 5.5*d^2/2 ?
Thank you.
Zr = alpha * d^2 >= 5.5*d^2/2.
Where
alpha = 34.5-4.28 * log N
and N = number of cycles over a 75 year design life.
Rearranging, when N > 115,000,000 alpha = 0
So...
When the design N > 115,000,000 do you just use 5.5*d^2/2 ?
Thank you.