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19011 Wood-Sao Road NE,Suite 100 <br /> Woodinville,WA 98072-4436 <br /> Phone:425-814-9448 <br /> ENGINEE$Ilti G Fag:425-821-2120 <br /> Pacific Ridge Homes Revision Date: 1/11/2021 <br /> Thelon Elevations A & Bt <br /> Redundancy, p 1.0 'w (Section 12.3.4) <br /> Design Base Shear <br /> SMs = Fa SS (Eq. 11.4-1) SM l = F„S, (Eq. 11.4-2) <br /> = 1.80 = 0.90 <br /> S DS = s S MS (Eq. 11.4-3) S D I _ Y-S M 4 (Eq. 11.4-4) <br /> = 1.20 = 0.60 <br /> Seismic Design Category: Structure Period and Weight: <br /> Short Period— D <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, TB = Ct (h„)x (Eq. 12.8-7) <br /> T= Ta = 0.22 <br /> Tz = 6 (Figs. 22-14 thru 22-17) <br /> Calculated design base shear. <br /> V= CS W (Eq. 12.8-1) <br /> SDS <br /> C 5 = (TR 1 (Eq. 12.8-2) <br /> Cs = 0.18 <br /> The total design base shear need not exceed. <br /> (Eq. 12.8-3) (Eq. 12.8-4) <br /> SD1 SDiTL <br /> for T Tz CS = Il <br /> TQR3 for T> Ti Cs = T2(TR <br /> 1 e <br /> CS = 0.43 Cs = 11.78 <br /> CS = 0.43 T<_TL <br /> C 5 = 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 s = 0,044S Ds l e >_0.01 (Eq. 12.8-5) <br /> CS = 0.05 <br /> nor when-S z >_ 0.6g. <br /> CS = 0.5S,/(R/1e) (Eq. 12.8-6) <br /> CS = 0.00 <br /> Cs = 0.18 <br /> V= 0.18 W Date:4/6/2022 <br /> Page: L1.3 <br />