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- PROJECT: Buitron Solar Panels Doug Engineering SHT.1 OF 2 <br />CLIENT:TPS Civil Engineering DATE 7/23/2013 <br />BY:DM DE JOB NO. TPS-1194 <br />DESIGN LOADS <br />Dead Loads <br />Roof <br />Comp. Shingle 3.5 psf Pupliftzl =14.0 psf <br />5/8" Ply shtg 1.9 Pupliftz2 =23.0 psf <br />Rf Frm'g 2.8 PWLdown -8.2 psf <br />Misc.1.5 0.6DL+WL <br />(N) PV System 3.0 Pnetzl = 0.6*3.0-14.0 -12.2 psf <br />Pnetz2 = 0.6*3.0-23.0 -21.2 psi <br />Total DL 12.7 psf DL+WL <br />LL 20 psf DL+WL =11.2 psf <br />Uplift Check <br />2x4 rafters @ 24" o.c. <br />Spacing 2.00 ft Trib panel width =6 ft <br />E 1500000 psi Fb=900*1.5*1.15 1553 psi <br />5 inA4 Mallow2x4Wind =1109 ft-lb <br />Spanl 8.00 ft Mallow2x4LL =867 ft-lb <br />Span2 6.00 ft See below for Wind Uplift loads <br />Span3 0.00 ft due to concentated loads at attachments <br />(Distance Wind Mmax P =Mmax <br />to Att.Load Trib Load wind(ft- PVDL live(ft- <br />Pts) a b Rl (lb) R2 (lb (psf) W (ft) (lb) lb) (lb) lb) <br />Panel Edge O.00 <br />1 1.00 1.00 7.00 -299.4 -42.8 -21.2 6.0 -342.2 -299.4 48.4 36.86 <br />2 4.38 4.38 3.62 -154.8 -187.3 -21.2 6.0 -342.2 -678.2 48.4 83.49 <br />Panel Edge 5.38 <br />Panel Edge 5.38 <br />3 6.38 6.38 1.62 -39.9 -157.0 -12.2 6.0 -196.9 -254.4 48.4 62.56 <br />4 9.76 1.76 4.24 -104.4 -43.3 -12.2 6.0 -196.9 -183.7 48.4 45.17 <br />Panel Edge 10.76 <br />Span 1 Uniform DL 8.00 46.6 46.6 5.8 psf 2.0 11.6 pif <br />Span 2 Uniform DL 6.00 34.9 34.9 5.8 psf 2.0 11.6 <br />Reactions at Spanl -447.5 -340.6 Negative values are uplift reactions <br />Reactions at Span2 -69.4 -8.4 <br />Mmaxwinduplift =912 ft-lb < 1109 ft-lb OK <br />For DL+LL including the PV system weight point loads W=59.4 pif P = <br />Mmax =631 ft-lb < 867 ft-lb OK <br />93.1 <br />52.4 <br />48.4 Ib <br />.