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 rb
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Radius of gyration of bracing member, in
rT
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Radius of gyration of a section comprising the compression
flange plus 1/3 of the compression web area taken about an
axis in the plane of the web, in
ru
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Ultimate unit resistance, psi or lb/in
rx, ry -
Radius of gyration in x- and y-axis, respectively, in
Ru
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Ultimate total resistance, k
S
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Elastic section modulus, in3
t
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Sheet thickness, in
tf
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Flange thickness, in
tw
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Web thickness, in
T
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Blast load duration, ms
TN
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Natural period of vibration, ms
V
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Support shear, k or lb
Vp
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Dynamic shear, k or lb
w
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Weight per unit length, lb/ft or k/ft
Load per unit area, psf
W
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Total weight, lb
XE
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Equivalent elastic deflection, in
Xm
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Maximum deflection, in
Z
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Plastic section modulus, in3
[alpha]
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Ratio of total horizontal to vertical peak loading
[beta]
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Base fixity factor
[gamma]
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Angle between bracing member and a horizontal plane, degrees
[delta]
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Relative sidesway deflection between stories
[theta]max - Maximum end rotation
[mu]max
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Maximum ductility ratio
2.08-196
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