10181208_2031 S. ARTESIA - Plan - Laserfiche WebLink

Home Browse Search

Structural Calculations -Roof Mounted Solar System - 2 arrays April 22, 2014 job: Luis Reyes Contractor: Sunpro Solar (Bob Kornmann) 2031 South Artesia 34859 Frederick St. Suite 101 Santa Ana, Ca. 92704 * (714) 915-8744 Wildomar, Ca. 92595 * (951) 813-5408 Description: (12) solar panels (217 total sq ft) mounted in (2)arrays on (5) lines, 79 total feet of Sun Frame rails supported by (23) standojfs connected to roof with (1) lag screw each through roof diaphragm (sealed) and supported by 2x4 trusses, 24 " c/c on south & east facing roofs ofexisting 1-story residence with standard flush mount on 3:12 pitch comp roofatjob address shown above.Area at bases to be patched with new roof sealant per Professional Solar Products installation instructions. Page 5 Worst Case loading considering all trusses and both arrays: wdl = 12.4 plf (6.2 psfx 2' dc trusses) see page 4 Mmax < 191 it-lb (array 1), V 1145 ib (D+L array 2-0= 1.25 stress increase), Lmax = 6.04' (array 2), Vnet uplift = /-115 lb (arrayx)+ 20 lbunifdead load+ 16 lbpointload/ = 79 lb < V - OK Vnet uplift at eaves = /-1411b (array l)+ 60 tb unif dead load + 211bpoint load/=60lb< V -OK If-1 ties or (3) 8d Mails each truss to plate - OK (3 - 8d nails allow 456 lb, H-1 allow 450 tb) Mnet uplift = /-206 ft lb (array 1)+ 26ft lb unif dead load + 46 ft lb point load / = 133 ft lb <M-OK Unif load: Mmax = 0.08 wL x L and Rmax = 0.607 wL, where continuous over supports Unif DL deflection = 0.027" max < 0.15" allowable, OK (I = 4.29 in4th &E= 1.7 x10 6th psi) (defl = .0069 wL4th(1728)/EI, max @ .44L from lowest end - where continuous over supports) 4 = 1.2" (2 x4 - OK) (Fv =95 psi) 1.b = 2.6" (2 x4 - OK) (Fb = 875 psi) Dead load deflection = 0.03 " unif + 0.02" = 0.05 " < 0.15 " (L/480) - OK Wind Download Deflection: 0.06" (array 1) < 0.26" (L/240) - OK Wind Download + dead loaddeflection = 0.11" < 0.34" (L/180) - OK Dead Load defl + Live Load defl = 0.05" DL + 0.07" LL = 0.12" < 0.40" (L/180) - OK Negative net uplift deflection: /-0.10" + 0.05 "/ = 0.05 " < 0.26" (L/240) - OK 4€ 20£. 1.4- (Fl--s- Ii_ nnt- 4/snn The 2x4 top chords of the trusses at 24" c/c can handle the additional dead 101*is*al@*WiiRkm:-ry, .g*down loads & uplift loads of the solar systems with the spans as shouy.]ron'notn,tfuss la,tourier diagrams herein for both Arrav 1 & Array 2)./ / I4%(«291<, i ice Z->•r f Lawrence R. Phelps, RCE 35280, Calif Lip: Renewal 9/30/201.5 NO. nLC JOZOU 1 fr :P167)Et31130Avenida Del Reposo,/Temea, California 9259144 . en,n. . , x77 0 < -- <3 (DF C ALIFL.1Cell/voice (951) 297-0554/ Office/voice (951) 694-6336 E>