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RB Engineers,Inc. Project: yam: RB/MJ'1' <br /> 1312 2nd St Kirkland,WA 'Clint: Date: 2/27/2021 <br /> Phone: (425) 822-3009 Subject: Laferal Calculations Page: <br /> Email: rbe1992@gmail.com <br /> QUAKE FORCES (ASCE 7-16) <br /> Site Class "D" (Table 11.4.2) <br /> Ss= 1.6-Critical Values per Latest SEAOC website; <br /> Si =0.57-Critical Values per Latest SEAOC website; <br /> Fa= 1.2 Minimum if Site Class D is taken as Default(Without Soils Report) Section(11.4.4) <br /> Fv= 1.8 per Table 11.4-2 <br /> Sms=Fa* Ss= 1.2 (1.6)= 1.92 (11.4-1) <br /> Sm l =Fv * S 1 = 1.8 (0.57)= 1.03 (11.4-2) <br /> Sds=2/3 * Sms=2/3 (1.92)= 1.28 (11.4-3), Seismic Design Category"I)", Table 11.6-1 <br /> Shc =2/3 * Sml =2/3 (1.03)=.69 (11.4-4); Seismic Design Category D,Table 11.6-2 <br /> SEISMIC RESPONSE COEFFICIENT: Use Section(12.8.1.1)ASCE 7-16 Except as Noted <br /> To=0.2(Shc/Sds)=0.11 SEC Section 11.4.6 <br /> Ts=Shc /Sds=0.54 SEC Section 11.4.6 <br /> Tstruc=Ct * (Hn)^3/4=0.020(25.3)^3/4=0.23 SEC (12.8-7);Ct=.02,Table 12.8-2 <br /> Where To<Tstruc<Ts; Sa=Sds= 1.28 Section 11.4.6,item 2 <br /> R=6.5 for Wood Shear Walls per ASCE 7-16 Table 12.2-1, item 15 <br /> Ie=1.0 Section 11.5.1,Table 1.5-1 and 1.5-2) <br /> Cs=Sds/(RJI)= 1.28/(6.5/1)=0.196 (12.8-2) <br /> Cs=0.20 <br />