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RE <br />V <br />I <br />S <br />I <br />O <br />N <br />S <br />40 <br />1 <br /> <br />S <br />O <br />U <br />T <br />H <br /> <br />R <br />O <br />S <br />S <br /> <br />S <br />T <br />R <br />E <br />E <br />T <br />SA <br />N <br />T <br />A <br /> <br />A <br />N <br />A <br />, <br /> <br />C <br />A <br /> <br />9 <br />2 <br />7 <br />0 <br />1 <br />(9 <br />0 <br />9 <br />) <br /> <br />7 <br />5 <br />7 <br />- <br />8 <br />4 <br />6 <br />0 <br />NG <br />U <br />Y <br />E <br />N <br />, <br /> <br />P <br />A <br />U <br />L <br />AP <br />N <br />: <br /> <br />3 <br />9 <br />8 <br />2 <br />9 <br />1 <br />0 <br />1 <br />DA <br />T <br />E <br />X_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />_ <br />LI <br />C <br /># <br />: <br /> <br />1 <br />0 <br />4 <br />1 <br />3 <br />1 <br />7 <br />, <br /> <br />C <br />- <br />1 <br />0 <br />, <br /> <br /> <br />E <br />X <br />P <br />. <br /> <br />0 <br />6 <br />/ <br />3 <br />0 <br />/ <br />2 <br />0 <br />2 <br />4 <br />PV 2.1 <br />ST <br />R <br />U <br />C <br />T <br />U <br />R <br />A <br />L <br /> <br />C <br />A <br />L <br />C <br />U <br />L <br />A <br />T <br />I <br />O <br />N <br />S <br />STRUCTURAL ENGINEERING FOR PV SOLAR PANEL INSTALLATION <br />CODE: 2022 CALIFORNIA BUILDING CODE / ASCE 7-16. RISK CATEGORY: II <br />GRAVITY LOAD CHECK <br />ROOF LIVE LOAD (PSF)20.00 <br />PV DEAD LOAD (PSF)3.00 <br />Dr = ROOF DEAD LOAD (PSF)10 <br />S = SNOW LOAD (PSF)0 <br />W = TOTAL LOAD (PSF)33 <br />RAFTER CHECK <br />DOUGLAS FIR-LARCH #2, Fb = 900PSI, LOAD DURATION FACTOR, <br />Cd = 1.25, F'b = Fb X Cd = 1,125PSI <br />RAFTER SIZE (IN)2 X 6 <br />ACTUAL Sx (IN3)7.56 <br />SP = RAFTER SPACING (IN)32 <br />Lm = MAXIMUM SPAN LENGTH (FT)8 <br />M = BENDING MOMENT (FT-LBS) (PER 1 FT <br />TRIBUTARY LOAD WIDTH)264.0 <br />Sx REQUIRED 7.5 <br />Sx REQUIRED < ACTUAL Sx RAFTERS O.K. <br />WIND LOAD CHECK: <br />MAX WIND SPEED = 130MPH, EXPOSURE 'C' (LOW RISE BUILDING, MAX HEIGHT 30 FT) <br />MAX WIND UPLIFT = 0.6 X 1.29 X 97.4psf <br />75.4psf (ZONE 3R) <br />(WIND LOADS ON COMPONENTS AND CLADDING: ASCE 7-16, FIG. 30.4-1) NET UPLIFT = 75.4 - 3.0 <br />(PV WEIGHT) = 72.4psf <br />PV PANEL SIZE = 3.44' X 6.37' = 22 SQ. FT, MAX TRIBUTARY AREA PER LAG SCREW = 22 SQ. FT / 2 <br />LAG SCREWS = 11 SQ. FT <br />ALLOWABLE WITHDRAWAL VALUE FOR 5/16" LAG SCREW = 266 LBS/IN (NDS TABLE 12.2A G = 0.5 <br />FOR DOUGLAS FIR-LARCH) <br />LOAD DURATION FACTOR = 1.6, REDUCTION FACTOR FOR PRYING ACTION = 0.8, MINIMUM <br />PENETRATION = 2.5 IN <br />T = 72.4 X 11 = 746 LBS < T(ALLOW) = 266 X 2.5 X 1.6 X 0.8 =851 LBS O.K. <br />SEISMIC LOAD CHECK: <br />(MAX) SDS = 2.0, I = 1.0 <br />NON-STRUCTURAL COMPONENTS (ASCE7-16, TABLE 13.6-1) <br />(Rp = 1.5, Ap = 1.0) -> MECHANICAL OR ELECTRICAL COMPONENTS <br />Fp = (0.4 X Ap X Sds X lp/ Rp) X (1 + 2 X Z / H) X Wp <br />Fp = (0.4 X 1.0 X Sds X 1.0/1.5) x (1 +2 x 20/20) x Wp <br />Fp = 0.8 X SDS X Wp = 0.8 X 2.0 X Wp = 1.6 X Wp -> GOVERNS <br />Fp(MIN) = 0.3 X SDS X Wp, Fp(MAX) = 1.6 X SDS X Wp <br />DESIGN LOADS = 1.6 Wp X 0.7 = 1.12 Wp (ALLOWABLE STRESS DESIGN) <br />Fp (SHEAR FORCE PER LAG SCREW) = 1.12 X 3.0psf X 11 SQ. FT = 37LBS < F(ALLOW) = 130 LBS --> <br />O.K. <br />SEISMIC FORCE INCREASE DUE TO PANEL WEIGHT: <br />(CBC SEC. 3404.A4) <br />V(BASE SHEAR) = Sds X I / R X W = CW <br />UNIT SEISMIC LOAD (w) = C (15psf (ROOF) + 15psf (WALLS) / 2 X 2) = C X 30psf WHEN THERE ARE <br />NO SOLAR PANELS. <br />UNIT SEISMIC LOAD (w') = C (15psf + 3psf + 15psf / 2 X 2) = C X 33psf WHEN THERE ARE SOLAR <br />PANELS. <br />INCREASE RATIO = C X 33 / C X 30 = 1.1 -> MAXIMUM 10% INCREASE WHEN ENTIRE ROOF IS <br />COVERED WITH SOLAR PANELS. (ENTIRE ROOF WILL NOT BE COVERED BY SOLAR PANELS) <br />INCREASE OF SEISMIC FORCE DUE TO SOLAR PANEL WEIGHT IS LESS THAN 10% --> O.K. <br />STRUCTURAL LOAD CALCULATIONS <br />401 S Ross St <br />11/30/2023