1 foot = 0.305 m
1 kip = 4.448 KN
1 kipft = 1.356 KNm
Determine diaphragm chord and collector forces
Chord Forces: Upper roof
Transverse direction:
The chord members for the upper roof diaphragm are the edge beams (W 12 x 26).
The diaphragm is assumed to be simply supported between the exterior shear walls and the interior
CMU wall.
w = 102 plf, span = 80 ft., depth = 40 ft.
M = wL2/8 = (102)(80' 2/8 = 81.6 kipft. (110.6 KNm)
)
T = M/d = (81.6 kipft) / 40 ft. = 2.04kips (9.07KN)
H1-26
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