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HOOD CALCULATIONS <br />BASIC DESIGN PARAMETERSE PER ASCE7-22 AND CBC2025 <br />SDS =1.17 <br />z/h =1 <br />Response Mod. Coeff.R =6 Table 12.2-1 <br />Component Importance Factor Ip =1 Chapter 13.1.3 <br />Importance Factor by Risk Cat.Ie =1 Table 1.5-2 <br />Oversrength Factor Omega =2.5 Table 12.2-1 <br />Component operating Weight:Wp =775 lbs See Specs by MFR. <br />Amplification with Height Hf = 1+2.5(z/h)(13.3-5) <br />Hf =3.5 <br />Structure Ductility Reduction Factor Ru = [1.1R/(Ie*Omega)]^1/2 >= 1.3 (13.3-6) <br />Ru =1.63 <br />CAR =1.4 Table 13.5-1 <br />Component strength factor Rpo =1.5 Table 13.5-1 <br />Horizontal Seismic Design Fp =0.4*Sds*Ip*Wp*[Hf/Ru]*[CAR/Rpo] <br />Fp =726.89 #GOVERNED <br />Fpmax = 1.6*Sds*Ip*Wp <br />Fpmax =1450.8 # <br />Fpmin = 0.3*Sds*Ip*Wp <br />Fpmin = 272.025 # <br />CHECK CONNECTION FROM HOOD TO WALL <br />No. of hanging angles to wall:6 ea.See Specs by MFR. <br />Withdrawal load 121.15 lbs. <br />Use #12 X 6" Long lag screw connection Hood to Wall. <br />Number of Screws:4 ea.See Specs by MFR. <br />Screw Withdrawal Capacity 154 lbs <br />Total Screw Withdrawal Capacity =616 lbs >121.15 lbs OK <br />CHECK TENSION OF THREADED ROD <br />Use 3/8" Threaded Rod A36 connected to Roof system @ 4 corner. <br />Total Tension Load T = Wp =775 lbs <br />Tension load @ ea. Rod T ea.=193.75 lbs <br />Tension Capacity: Tcap.=600 lbs >193.75 lbs OK <br />Component resonance ductility factor that converts the <br />peak floor or ground acceleration into the peak component acceleration <br />9 of 9