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Re: Old UBC Base Shear

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Well, here are the requirements of the 1967 UBC (presumably what would be operative in 1969):

Base Shear, V = ZKCW;      Z =1.0 for Seismic Zone 3 (No Zone 4 in '67)
                           K  = 1.33 for Shear Wall Building
                           C = 0.05/T^0.33 w/ T = 0.05Hx/D^0.5 (Hx = Height
                                                              D = Bldg. Dimen.
                                                              in Force Dir.)

HTH,

Ephraim G. Hirsch, S1200 (CA)