Laserfiche WebLink
SHEET: 5 OF 6 <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 -15.5 psf, MIN 10 PSF <br />5/8" Ply shtg 1.9 Overhang -20.7 psf <br />Rf Frm'g 2.8 pWLdown = 9.0 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 -15.5 -13.7 psf <br />Zone 2 0.6*3 -20.7 -18.9 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 1553 psi <br />I 5.4 in^4 MallowWind =1110 ft-lb <br />Span1 7.75 ft MallowLL =867 ft-lb <br />Span2 7.75 ft See below for Wind Uplift loads <br />Span3 7.75 ft due to concentated loads at attachments <br />Span4 7.75 ft <br />(Distance <br />to Att. <br />Pts) a b R1 (lb) R 2 (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 />23.00 <br />1 22.25 6.75 1.00 24.8 167.4 15.5 4.0 192.2 167 124 37.2 161.2 <br />2 26.15 2.90 4.85 120.3 71.9 15.5 4.0 192.2 349 124 37.2 161.2 <br />3 28.00 4.75 3.00 74.4 117.8 15.5 4.0 192.2 353 124 37.2 161.2 <br />4 31.90 8.65 -0.90 -22.3 214.5 15.5 4.0 192.2 -193 124 37.2 161.2 <br />5 33.75 10.50 -2.75 -68.2 260.4 15.5 4.0 192.2 -716 124 37.2 161.2 <br />34.68 <br />Span 1 Uniform DL 7.75 47.4 47.4 6.1 psf 2.0 12.2 plf 91.9 <br />Span 2 Uniform DL 7.75 47.4 47.4 6.1 psf 2.0 12.2 91.9 <br />Reactions at Span1 47.4 47.4 Negative values are uplift reactions <br />Reactions at Span2 25.1 262.0 <br />Mmaxwindup =248 ft-lb < 1110 ft-lb OK <br />Mmaxwinddown =494 ft-lb < 1110 ft-lb OK <br />For DL+LL including the PV system weight point loads w = 60.4 plf P = 37.2 lb <br />Mmax =527 ft-lb < 867 ft-lb OK <br />Deflection Check <br />DDL = 5wL4 /(384EI) (5*13.2*7.75^4)*1728 = 0.267 in = L/ 348.9 OK <br />384*1.5E6*5.4 <br />PROJECT: <br />CLIENT: <br />BY: <br />PV Panels for April Howard <br />SunLux <br />Doug Engineering <br />8/22/2022 <br />SLE-4569 <br />P = DL+WL <br />(lb) <br />2628 W Northwood <br />Ave10/12/22