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ENGINEERING <br />Pacific Ridge Homes <br />Thelon (Elevations A & B) <br />Redundancy, p 1.0 <br />Design Base Shear <br />SMS = FaSS <br />= 1.80 <br />Sos = % SMs <br />= 1.20 <br />Seismic design Category: <br />Short Period — D <br />19011 Wood-Sno Road NE, Suite 100 <br />Woodhxvikte, WA 98072-4436 <br />Phone: 425-814-8448 <br />Fax: 425-821-2120 <br />Revision Date: 1/11/2021 <br />(Section 12.3.4) <br />(Eq. 11.4-1) SM, = F„S1 (Eq. 11.4-2) <br />= 0.90 <br />(Eq. 11.4-3) St', = V� S M 1 (Eq. 11.44) <br />= 0.60 <br />Structure Period and Weight: <br />1-Second Period — D Ct = 0.020 Table 12.8-2 <br />x = 0.75 <br />Building Height (Mean Roof), h„ = 24 ft <br />Approximate Fundamental Period, Ta = Ct (h„)" (Eq. 12.8-7) <br />T=Ta=0.22 <br />TL = 6 (Figs. 22-14 thru 22-17) <br />Calculated design base shear. <br />V = C, W (Eq. 12.8-1) <br />sps <br />C, = rrR} (Eq. 12.8-2) <br />17! <br />CS=0.18 <br />The total design base shear need not exceed: <br />(Eq. 12.8-3) (Eq. 12.84) <br />SM SPITL <br />for T :E� TL C, = T JR\ for T > TL CS = T2 (21�e-}le <br />Cs=0.43 Cs= 11.78 <br />C, = 0.43 T!; TL <br />C, = 0.64 1.5 times Cs in accordance with 11.4.8 <br />The total design base shear shall not be less than: <br />C, = 0.044S Ds 1, >_ 0.01 (Eq. 12.8-5) <br />C, = 0.05 <br />nor where S t z 0.6g: <br />CS = 0.5Ss/(R/la) (Eq. 12.8-6) <br />C, = 0.00 <br />C, = 0.18 <br />V= 0.18W <br />Date: 4/6/2022 <br />Page: L113 <br />