I am designing a bridge on private property that the owner would like to be wood. However, due to the span and clearance limitations, I will be using timber planks over steel stringers. I was comparing load distribution between AASHTO 22.214.171.124 and table 126.96.36.199.2a-1. The 36" spacing or 6x nominal plank thickness limitation bothers me. In the commentary, the code states that the approximate methods of analysis are not valid and two dimensional methods of analysis are recommended.
Now, I'm having difficulties with the "Orthogonal plate theory" method, especially considering a wood plank deck. Can someone shed some light on this?
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