In AASHTO it gives two equations for determining the stress that can be used in design of prestressed strands that are extended past the girders and into a continuity diaphragm with a 90 degree bend. See below.




In the equations it shows that the stress is a function of the total strand length minus 8 inches. Below it says that the strands must project at least 8 inches before they are bent.
My question is if the equations need to be adjusted if the distance before the bend is longer than 8 inches? See below example where strand extends 10 inches before being bent upwards. In this case would the equation be updated to f_psl = (30"-10")/0.228, or would it remain the same as in the code with f_psl = (30"-8")/0.228.
I think the equation should remain the same as presented in the code regardless of the distance before the bend as it specifies that l_dsh is the total length the extended strand which includes the total horizontal and vertical distances. But the 8 inches in the equations and the 8 inches projecting requirement throw me off.