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Orie 2 Engineering Project No. : 219.007-24 <br />Structural & Bridge Engineers <br />9750 Miramar Road, Suite 310 Phone # : (858) 335-7643 Project : Vietnamese Alliance Church PV BY : ESY <br />San Diego, CA 92126 www.orie2.com HighRooftop Solar <br />ASCE 7-16 29.4.3: Rooftop Solar Panels w/ Flat/Gable/Hip Roofs w/ Slopes < 7 ⁰ <br />MWFRS - Other Structures - Rooftop Solar Panels <br />Step 1: Determine risk category of building or other structure <br />Risk Category =II Table 1.5-1 <br />Step 2: Determine the basic wind speed, V, for applicable risk category <br />Wind Speed, V =95 mph Figure 26.5-1A, B, C, or D <br />Step 3: Determine wind load parameters: <br />Wind Directionality factor, Kd =0.85 Section 26.6 and Table 26.6-1 <br />Exposure Category =C Section 26.7 <br />Topography factor, Kzt =1.00 Section 26.8 and Figure 26.8-1 <br />Gust Effect factor, G =0.85 Section 26.11 <br />Ground Elevation Factor, Ke =1.00 Section 26.9 <br />Step 4: Determine velocity pressure exposure coefficient, Kz or Kh <br />Height above ground level, z =31 ft <br />Exposure coefficient, Kh =0.99 Table 26.10-1 <br />Step 5: Determine velocity pressure, qz or qh <br />qh =0.00256*Kh*Kzt*Kd*Ke*V2 Equation 26.10-1 <br />= 19.44 psf <br />Step 6: Determine Net Pressure Coefficient, GCrn: <br />Building width, W s =71.5 ft <br />Building length, W L =105.5 ft <br />Roof height, h =31.0 ft <br />Parapet height, hpt = 2.0 ft <br />Panel length, Lp =7.48 ft ≤ 6.7' Section 29.4.3 NOT permitted <br />Tilt, ω =10.00 deg ≤ 35° Section 29.4.3 <br />Effective wind Area, A =34.70 ft2 <br />2*h = 62.0 ft <br />Roof Zone =3 -Figure 29.4-7 <br />Nominal Net pressure Coeff, GCrnnom =1.381 -Figure 29.4-7 <br />γp = min(1.2, 0.9+hpt/h) =1.0 -Section 29.4.3 <br />γc = max(0.6+0.06Lp, 0.8) =1.0 -Section 29.4.3 <br />γE (Uplift) =1.50 -Section 29.4.3 γE =1.5 for uplift loads <br />γE (Downward) =1.00 -Section 29.4.3 γE =1.0 for downward loads <br />Net Pressure Coefficient, GCrn + =γp* γc*γE*GCrnnom Eqn 29.4-6 <br />= 1.397 - <br />Net Pressure Coefficient, GCrn - =γp* γc*γE*GCrnnom Eqn 29.4-6 <br />= 2.096 - <br />Step 7: Calculate wind pressure to panels, p: <br />p (+) = qh*(GCrn) =27.2 psf Eqn 29.4-5 Downward Wind Load <br />p (-) = qh*(-GCrn) =-40.8 psf Eqn 29.4-5 Upward Wind Load <br />All Loads in Strength Value, multiply by 0.6 to get to ASD Design Value <br />BRIDGEORIE 2 <br />STRUCTURAL <br />Page 9Roof Framing Analysis - Wind Design Example: 11-7/8" TJI 560 <br />2130 N Grand Ave <br />10/1/2024