1927: F = C·W : based on Pacific Coast Building Officials Conference (PCBOC)
here, C : foundation-dependant factor
1933: V = 0.02 ∼ 0.08(DL + LL) : after Long Beach earthquake
1935: V = 0.08∼0.16(DL + 0.5LL) for only Z=3 : introduced Z=1,2,3
1959: V = K·C·W : SEAOC, Blue Book
1961: V = Z·K·C·W : UBC
1974: V = Z·I·K·C·S·W : SEAOC, Blue Book
1988: V = Z·I·C·W/Rw : UBC
1997: V = Cv·I·W/(R·T) : UBC
2000: V = Cs·W : IBC, ASCE
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