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.; 19011 Wood-Sao Road NE,Suite 100 <br /> WoodinviUe,WA 98072-4436 <br /> Phone:425-814-8448 <br /> E NGINEERIN G Fa1c 425-821-2120 <br /> . Pacific Ridge Homes Revision Date: 1/11/2021 <br /> Lennon (Elevations A & B) <br /> Redundancy,p 1.0 • (Section 12.3.4) <br /> Design Base Shear <br /> Sms = FeSs (Eq. 11.4-1) SMz = F„S1 (Eq. 11.4-2) <br /> = 1,80 = 0.90 <br /> SDs = %S Ms (Eq. 11.4-3) SDI = a/SM 1 (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, T. = C, (h„)" (Eq. 12.8-7) <br /> T= Ta = 0.22 <br /> T� = 6 (Figs. 22-14 thru 22-17) <br /> Calculated design base shear. <br /> V= C 5 W (Eq. 12.8-1) <br /> SDS <br /> Cs = (R (Eq. 12.8-2) <br /> re <br /> CS = 0.18 <br /> The total design base shear need not exceed: <br /> (Eq. 12.8-3) (Eq. 12.8-4) <br /> SDl SDiTL <br /> for T :-!� TL Cs = T�R� z for T> T� CS = T (TR <br /> ie <br /> CS = 0.43 CS = 11.78 <br /> Cs = 0.43 Ts TL <br /> CS = 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$ = 0.044SDs le >_0.01 (Eq. 12.8-5) <br /> CS = 0.05 <br /> nor where S 1 >_ 0.6g: <br /> CS = 0.5S1/(R/le) (Eq. 12.8-6) <br /> CS = 0.00 <br /> Cs = 0.18 <br /> V= 0.18 W Date:3/31/2022 <br /> Page: L1.3 <br />