Laserfiche WebLink
SHEET: 7 OF 10 <br />DATE: <br />DE JOB NO.: <br />DESIGN LOADS <br />Dead Loads Uplift <br />Roof 0.6WL <br />COMP SHINGLE 4.0 psf 0.6WL Zone 1 and 2e -20.1 psf, MIN 10 PSF <br />5/8" Ply shtg 1.9 Overhang -25 psf <br />Rf Frm'g 2.8 pWLdown = 11.6 psf 10 psf, MIN 10 PSF <br />Misc. 1.5 Uplift 0.6DL+0.6WL <br />(N) PV System 3.0 Zone 1 0.6*3 -20.1 -18.3 psf <br />Zone 2 0.6*3 -25 -23.2 psf <br />Total DL 13.2 psf Downward DL+0.6WL <br />LL 20.0 psf PDL+WL = 13.0 psf <br />SNOW 0.0 psf <br />Rafter Check <br />Existing 2x4 TRUSSES @ 24" o.c <br />Spacing 2.00 ft Trib panel width = 4 ft <br />E 1500000 psi Fb = 900*1.5*1.15 1552.5 psi <br />I 5.4 in^4 MallowWind = 1110 ft-lb <br />Span1 7.83 ft MallowLL = 867 ft-lb <br />Span2 7.83 ft See below for Wind Uplift loads <br />Span3 0.00 ft due to concentated loads at attachments <br />Span4 0.00 ft <br />(Distance <br />to Att. <br />Pts) a b R1 (lb) R2 (lb <br />Load <br />(psf) <br />Trib W <br />(ft) <br />Wind <br />Uplift <br />(lb) <br />Mmax <br />wind(ft- <br />lb) <br />Wind <br />Down <br />(lb) <br />P = <br />PVDL <br />(lb) <br />-1.50 <br />1 -0.45 -0.45 8.28 326.1 -17.7 25 4.0 308.3 -139 123.33 37.0 160.3 <br />2 3.27 3.27 4.56 144.4 103.5 20.1 4.0 247.9 472 123.33 37.0 160.3 <br />3 5.05 5.05 2.78 88.0 159.9 20.1 4.0 247.9 444 123.33 37.0 160.3 <br />4 8.76 0.93 6.90 218.5 29.4 20.1 4.0 247.9 203 123.33 37.0 160.3 <br />9.65 <br />Span 1 Uniform DL 7.83 47.9 47.9 6.1 psf 2.0 12.2 plf 93.8 <br />Span 2 Uniform DL 7.83 47.9 47.9 6.1 psf 2.0 12.2 93.8 <br />Reactions at Span1 606.4 293.6 Negative values are uplift reactions <br />Reactions at Span2 266.4 77.4 <br />Mmaxwindup =493 ft-lb < 1110 ft-lb OK <br />Mmaxwinddown =605 ft-lb < 1110 ft-lb OK <br />For DL+LL including the PV system weight point loads w = 60.4 plf P = 37.0 lb <br />Mmax =566 ft-lb < 867 ft-lb OK <br />Deflection Check <br />DDL = 5wL4/(384EI) (5*13.2*7.83^4)*1728 = 0.278 in = L/ 338.3 OK <br />384*1.5E6*5.4 <br />PROJECT: <br />CLIENT: <br />BY: <br />PV Panels for Kevin Trieu <br />ParagonSun <br />Doug Engineering <br />11/2/2022 <br />PGS-1254 <br />P = DL+WL <br />(lb) <br />3325 S Baker St <br />01/12/23