I have a 30 ft. x 30 ft. trellis with perimeter HSS beams and two intermediate HSS or I-beams to break the 2x10 rafters into 10 ft. spans. For wind perp. to the rafters, does anyone have any info on the wind shading from rafter to rafter? I found an old post from 2006 in Eng Tips that states anything within 4d spacing is considered shaded. Not references were cited, however.
(This is cross posted to Eng Tips)