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B IL <br />ENGINEERING <br />Pacific Ridge Homes <br />Hudson (Elevations A & B) <br />Redundancy, p 1.0 <br />Design Base Shear <br />SMs=F,Ss <br />= 1.80 <br />S Ds = % S Ms <br />= 1.20 <br />19011 Wood-Sno Road NE, Suite 100 <br />Woodinville, 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) S M , = F„S j (Eq. 11.4-2) <br />= 0.90 <br />(Eq. 11.4-3) S D z = z/ S M ; (Eq. 11.4-4) <br />= 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„ = 23 ft <br />Approximate Fundamental Period, Ta = Ct (h„)" (Eq. 12.8-7) <br />T = T, = 0.21 <br />TL = 6 (Figs. 22-14 thru 22-17) <br />Calculated design base shear.- <br />V = CS W (Eq. 12.8-1) <br />SDS <br />CS = (R\ (Eq. 12.8-2) <br />je <br />CS=0.18 <br />The total design base shear need not exceed.- <br />(Eq. 12.8-3) (Eq. 12.84) <br />for T TL CS = SDI SD1TL <br />(R) for T > TL CS = <br />T \Ie/ Tz ��} <br />CS=0.44 CS= 12.38 <br />Cs = 0.44 T <_ TL <br />C S = 0.65 1.5 times Cs in accordance with 11.4. 8 <br />The total design base shear shall not be less than: <br />CS = 0.044SDs 1e >_ 0.01 (Eq. 12.8-5) <br />Cs = 0.05 <br />nor where S >_ 0.6g: <br />CS = 0.5S1/(R/le) (Eq. 12.8-6) <br />Cs = 0.00 <br />CS=0.18 <br />V= 0.18W <br />Date. 6/20/2022 <br />Page: L1.3 <br />