I am confused with the design of Diaphragm shear calculation in floor or flat roof for plywood. Let say I have five shear walls carrying 20kips of shear force on each shear walls of length 20 ft. My roof and floor width is 40ft wide by 120 ft long. So, I when i calculate the diaphragm shear force along floor or roof (width side of 40ft) it will be 20K/20ft = 1kips/ft of diaphragm shear. So i provide the sheathing size and nailing pattern for diaphragm shear on floor per 1kips/ft??? Is this correct? Do i take the full diaphragm width of 40ft and diaphragm force will be 20k/40ft = 0.5k/ft and design sheathing and nailing pattern per this load? Please suggest which is correct. I am told to take the full length of diaphragm width as 40 ft????????
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