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■ r ■ <br /> MORRISON HERSHFIELD <br /> Project#: 7170339 Date: 10/09/2017 <br /> Site: SEA Casino Road By: YW <br /> SEISMIC CALCULATION <br /> Seismic Loads: IBC 2015 Strength Level Forces <br /> Risk Category : II <br /> Importance Factor(I): 1.00 <br /> Site Class: D Gass D <br /> Ss(0.2 sec)= 141.90%g' <br /> S1 (1.0 sec)= 54.40%g' <br /> Fa= 1.000 Sms= 1.419 Sos= 0.946 Design Category= D <br /> Fv= 1.500 Sm1 = 0.816 Soi= 0.544 Design Category= D <br /> Seismic Design Category=' D f-1 I <br /> Check to use SDC D as a minirn�m <br /> ARCHITECTURAL COMPONENTS SEISMIC COEFFICIENTS <br /> Architectural Component: Signs and Billboards <br /> Importance Factor(Ip): 10 a 1.0 all other componentsAV <br /> Component Amplification Factor(op)= 2.5 b= 15.5 feet <br /> Comp Response Modification Factor(Rp)= 3 z= 26.0 feet z/h= 1.00 <br /> Fp= 0.4apSdsIpWp(1+2z/h)/Rp= 0.946 Wp <br /> not greater than Fp= 1.6SdslpWp= 1.514 Wp <br /> but not less than Fp=0.3SdslpWp= 0.284 Wp use Fp= 0.946 Wp <br /> Seismic loads: <br /> On new antenna = 0.7x0.946x57 = 38 lbs <br /> On existing antenna = 0.7x0.946x24 = 16 lbs <br /> Seismic loads are less than wind loads. Therefore, wind load governs the mount design. <br /> 4 <br />