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(2025 CBC) <br />Switchboard <br />Material Properties: <br />fc' =2.5 ksi (= Concrete Compressive Stress) <br />c =150 pcf (= Concrete Unit Weight) <br />Concrete Pad Dimension: <br />B =5.2 ft <br />L =12.2 ft <br />t = 0.83 ft 10"pad <br />s =0.0 ft, Eccentricity <br />A = 62.9 ft2 <br />Wc = 7,858 lbs <br />Stability Check :(in Short Direction) <br />Equipment Weight, We =7,500 lbs 0.7EQ = 1,880 lbs COG = 4.6 <br />Total Vertical Load, Q = 15,358 lbs 0.6WL = 990 lbs <br />Seismic:MR =0.6Wcx(B/2)+0.6(We-0.14SdsWe)x(B/2-s)MOT =0.7 x V x COG <br />=20.6 kips-ft =8.7 kips-ft <br />FS =MR/ MOT <br />=2.4 > 1.0 (O.K) <br />Wind:MR =0.6Wc x (B/2) + 0.6We x (B/2-s)MOT =0.6 x V x COG <br />=23.8 kips-ft =4.6 kips-ft <br />FS =MR/ MOT <br />=5.2 > 1.0 (O.K) <br />Bearing Pressure Check: <br />qallow =1,500 psf <br />e =MOT / Q =0.6 ft < B/6 <br />qmax =Q/A (1+6e/B)qmin =Q/A (1-6e/B) <br />=405 psf =84 psf <br />qmax =405 psf < 1,500 psf (O.K) <br />Sliding Check : <br />Vmax=1,880 lbs f =0.35 <br />Vresisting=0.6Q x f <br />=3,225 lbs >1,880 lbs (O.K) <br />As min. Check :min =0.0018 (for fy = 60 ksi) <br />try #5 @ 16 inch O.C. <br /> As,req =0.29 in < As =0.31 in (O.K) <br />L <br />B <br />t <br />25