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 *ln
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Clear span distance, in
LF
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Length of foundation extension, ft
Mcr
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Applied design moment at critical section, in-lb
Mu
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Ultimate unit resisting moment, in-lb/in
N
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Blow count from standard penetration test
NS
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Number of soil elements
pw
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Ratio of area of flexural reinforcement to area of concrete
Pcr
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Bearing pressure at critical section for shear
Ps
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Bearing pressure at critical section for bending
Tc
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Total thickness of foundation, in
TS
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Thickness of foundation extension, ft
TW
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Thickness of wall, ft
Vc
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Allowable concrete shear stress, psi
Vs
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Shear force at support, lb
Vu
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Total applied design shear force at critical section, lb or
lb/in
W
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Explosive charge weight, lb
Ws
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Weight of structure, tons
[phi]
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Capacity reduction factor
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Reinforcement bar diameter
[nu]
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Poisson's ratio
[PHI]
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Overturning angle
2.08-327
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