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HomeMy WebLinkAboutSTRUCTURAL CERTIFICATION REPORT - 23-00514 - 369 W 1st N - Solar PanelsSTRUCTURAL CERTIFICATION REPORT Roof-mounted Solar Panels July 27, 2023 To: 1Solar Re: Kenneth Sare 2391 S. 1560 W Suite C 369 W 1st N Woods Cross, UT 84087 Rexburg, ID 83440 AHJ: Rexburg (City), ID 1Solar proposes to install new roof-mounted solar panels at this residence and asked Right Angle Engineering to review the existing structure for suitability. This letter summarizes the methods that were used to survey, evaluate, and certify the existing roof framing and the attachment of the new solar panels to it. STRUCTURAL DESIGN Building Code:International Residential Code 2018 Design Standards:ASCE 7-16 Snow:Ground: pg= 50.0 psf | Flat Roof: pf= 34.65 psf | Sloped Roof: ps= 29.78 psf Wind:Ultimate Wind Speed = 115.0 mph | Exposure = C Seismic:Risk Category = 2 | Seismic Design Category = A | Site Class = D STRUCTURE Field Technicians from 1Solar visited the site and observed the existing structure : Array Name Panel Quantity Roof Framing Material Pitch Array 1 29 2x4 Fink Truss | 24" o.c.Asphalt Shingles 18° ANCHORAGE The solar panel anchorage shall be installed according to the manufacturer's most current installation manual. Anchorage shall be staggered to distribute the load evenly to adjacent roof members. The solar panels should be mounted parallel (max 10 inches) to the roof surface. Array Name Connection Type Fastener Max Anchorage Spacing Array 1 L-Foot 5/16” lag screw (3.0" embedment) into roof substructure 48" Installation Instructions Solar panels and the equipment shall be installed per the manufacturer's installation specifications. Improper installation will void this certification. Deviations from the approved structural plans (including equipment substitutions) are not allowed without written approval from Right Angle Engineering. Prior to installation, the installer should: •Confirm that the existing structure matches the information provided in the structural survey, the approved installation plans and this certification. •Identify discrepancies between this certification and the approved installation plans. If found, then this certification shall govern. •Identify structural elements that are dangerous (cracked, broken, excessive sag, signs of overstress, rot,decay, fire, water). If found, installation shall cease until those elements are adequately abated and made to comply with the referenced building code. •Verify that both the existing structure and the solar addition has been permitted through the AHJ. 581 E Technology Ave, C1500 | Orem, UT 84097 | 925-787-3067 | www.rightangleeng.com | Page 1 of 7 STRUCTURAL CERTIFICATION I certify the addition of solar panels on the roof of this structure does not cause the structure to become unsafe or make it generally less compliant with the life-safety requirements of the referenced building code. Based on the evaluation methods described below, for the loads that exist at this site, the existing framing will safely support the new solar panels if they are installed and attached correctly. Electrical design is not included in this certification. Array Name Certification Method Retrofits Array 1 Stress analysis International Residential code None required Regards, 07/27/2023 Robert D. Smythe, P.E. Right Angle Engineering 581 E Technology Ave, C1500 | Orem, UT 84097 | 925-787-3067 | www.rightangleeng.com | Page 2 of 7 Job Details Roof Snow Load - ASCE 7-16 Design Criteria Ground Snow Load (pg) Section 7.2 50.0 psf Wind Speed (Vult) Local Design Criteria 115.0mph Exposure Factor (Ce) Table 7.3-1 0.9 Exposure Category C Thermal Factor (Ct) Table 7.3-2 1.1 Risk Category 2 Importance Factor (Is) Table 1.5-2 1 Mean Roof Height 20 ft Flat Roof Snow Load (pƒ) Equation 7.3-1 34.65 psf Roof Type Gable Roof Slippery Surface Slope Factor (Cs) Figure 7.4-1 0.86 Building Type Enclosed Non-Slippery Surface Slope Factor (Cs) Figure 7.4-1 1 Roof Live Load Roof Snow Load Equation 7.4-1 34.65 psf Existing Roof Live Load ASCE 7-16 Table 4.3-1 20 psf Reduced Snow Load (Slippery Surface) Equation 7.4-1 29.78 psf 1Roof Dead Load Asphalt Shingles 2.0 psf No Drywall 0.0 psf 5/8" Plywood Sheathing 2.0 psf Solar Panel Array 2.74 psf Roof Framing 1.1 psf Dead Load Without Panels 6.3 psf Insulation 1.2 psf 1Roof Dead Load is taken from the worst case scenario dead load from all arrays of the job in order to provide a more conservative evaluation. 581 E Technology Ave, C1500 | Orem, UT 84097 | 925-787-3067 | www.rightangleeng.com | Page 3 of 7 Array 1 Array Details Roof Framing 2x4 Fink DF No.2 Spacing 24.0" Beam Span 15.0' Roof Pitch 18° Panel Quantity 29 Panel Array Area 627.42 ft² Panel Orientation Portrait Lag Screw Embedment 3.0" Roof Attachment Type L-Foot 5/16” lag screw Shear Capacity NDS 2015 Table 12K 190.0 lbs Pullout Capacity NDS 2015 Table 12K 798.0 lbs Velocity Pressure Equation 26.10-1 (Kz=0.9, Kht=1, Kd=0.85, Ke=0.84) 21.76 psf GCP Zones 1/2e 2n/2r /3e 3r GCp Figure 30.3-(2A-5B)-2.0 -3.0 -3.6 Design Pressure Up [psf] Equation 29.4-7 ga=0.8 gE=1.0 -34.8 -52.2 -62.7 Exposed Design Pressure Up [psf] ga=0.8 gE=1.5 -52.2 -78.3 -94.0 Design Pressure Down [psf]8.7 8.7 8.7 Tributary Area [ft2]18.5 18.5 18.5 Maximum Connection Spacing [in]71 71 71 Maximum Rail Span [in]48 48 48 Maximum Rail Cantilever [in]16 16 16 Design Connection Spacing [in]48 48 48 Deign Connection Spacing (exposed) [in]48 48 48 581 E Technology Ave, C1500 | Orem, UT 84097 | 925-787-3067 | www.rightangleeng.com | Page 4 of 7 Design Ratio Member ID P Mz Vy C SR D Status 1 0.272 0.585 0.542 0.658 0.035 0.288 Pass 2 0.296 0.919 0.464 1.006 0.035 0.404 Pass 3 0.492 0.049 0.004 0.541 0.137 0.049 Pass 4 0.007 0.167 0.152 0.174 0.035 0.769 Pass 5 0.007 0.167 0.152 0.174 0.035 0.738 Pass 6 0.108 0.0 0.0 0.108 0.066 0.0 Pass 7 0.141 0.0 0.0 0.141 0.066 0.0 Pass 8 0.109 0.0 0.0 0.109 0.047 0.0 Pass 9 0.142 0.0 0.0 0.142 0.047 0.0 Pass Member Design Capacity (LRFD) Member ID FIb(ksi)FIt(ksi)FIv(ksi)FIc(ksi)FIcp(ksi)EI(ksi)EminI(ksi) 1 2.681 1.49 0.311 2.683 0.939 1600.0 1041.216 2 2.681 1.49 0.311 2.683 0.939 1600.0 1041.216 3 2.681 1.49 0.311 2.683 0.939 1600.0 1041.216 4 2.681 1.49 0.311 2.683 0.939 1600.0 1041.216 5 2.681 1.49 0.311 2.683 0.939 1600.0 1041.216 6 2.681 1.49 0.311 2.683 0.939 1600.0 1041.216 7 2.681 1.49 0.311 2.683 0.939 1600.0 1041.216 8 2.681 1.49 0.311 2.683 0.939 1600.0 1041.216 9 2.681 1.49 0.311 2.683 0.939 1600.0 1041.216 Node Coordinates ID X Coordinate Y Coordinate 1 0.000 0.000 2 15.000 4.999 3 30.000 0.000 4 -1.500 -0.500 5 31.500 -0.500 6 10.000 0.000 7 20.000 0.000 8 7.500 2.499 9 22.500 2.499 Members ID Node A Node B Section Node A Fixity Node B Fixity Length 1 1 2 1 FFFFFF FFFFRR 15.811 2 2 3 1 FFFFRR FFFFFF 15.811 3 3 1 1 FFFFRR FFFFRR 30.000 4 4 1 1 FFFFFF FFFFFF 1.581 5 3 5 1 FFFFFF FFFFFF 1.581 6 2 6 1 FFFFRR FFFFRR 7.070 7 2 7 1 FFFFRR FFFFRR 7.070 8 6 8 1 FFFFRR FFFFRR 3.535 9 7 9 1 FFFFRR FFFFRR 3.535 Supports ID Node ID Restraint Code 1 1 FFFFRR 2 3 RFFRRR Materials ID Name Young's Modulus Density Poisson's Ratio 1 NDS - Table 4A - DOUGLAS FIR-LARCH - No.2- 2in & wider 1600.000 33.308 0.400 Sections 581 E Technology Ave, C1500 | Orem, UT 84097 | 925-787-3067 | www.rightangleeng.com | Page 5 of 7 ID Name Depth Width Shear Area Z Shear Area Y Torsion Radius 1 1.5 x 3.5 4.000 1.500 5.000 5.000 1.463 ID Centroid Y Centroid Z Area Y-Axis Mol Z-Axis Mol Torsion Constant 1 0.750 2.000 6.000 1.125 8.000 3.437 Point Loads ID Load Group Member Position %Y Magnitude 1 Solar-Snow 1 8.974%-0.322 2 Solar 1 8.974%-0.026 3 Solar-Snow 1 46.516%-0.322 4 Solar 1 46.516%-0.026 Member Distributed Loads ID Load Group Start Position End Position Member Y Magnitude 1 Dead Load 0.000%100.000%4 -0.013 2 Dead Load 0.000%100.000%1 -0.013 3 Dead Load 0.000%100.000%2 -0.013 4 Dead Load 0.000%100.000%5 -0.013 5 Roof Live Load 0.000%100.000%4 -0.032 6 Roof Live Load 0.000%2.649%1 -0.032 7 Roof Live Load 77.733%100.000%1 -0.032 8 Roof Live Load 0.000%100.000%2 -0.032 9 Roof Live Load 0.000%100.000%5 -0.032 10 Snow Load 0.000%100.000%4 -0.069 11 Snow Load 0.000%2.649%1 -0.069 12 Snow Load 77.733%100.000%1 -0.069 13 Snow Load 0.000%100.000%2 -0.069 14 Snow Load 0.000%100.000%5 -0.069 Load Combinations ID Name Dead Load Factor Snow Load Factor Solar Factor Solar-Snow Factor Roof Live Load Factor 1 1. 1.4D 1.4 0 1.4 0 0 2 3. 1.2D + 1.6Lr 1.2 0 1.2 0 1.6 3 3. 1.2D + 1.6S 1.2 1.6 1.2 1.6 0 4 4. service loads A 0 1 0 1 0 5 5. service loads B 0 0 0 0 1 Internal Member Forces and Moments Member Axial Force (Min/Max) Shear Force Y (Min/Max) Shear Force Z (Min/Max) Torsion (Min/Max) Bending Moment Y (Min/Max) Bending Moment Z (Min/Max) 1 3.381 / 4.375 -0.673 / 0.521 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 -0.462 / 0.523 2 3.570 / 4.768 -0.576 / 0.558 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 -0.821 / 0.523 3 -4.401 / -2.612 -0.004 / 0.004 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 0.000 / 0.044 4 -0.063 / 0.000 -0.189 / 0.000 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 -0.149 / 0.000 5 -0.063 / 0.000 0.000 / 0.189 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 -0.149 / 0.000 6 -0.969 / -0.969 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 7 -1.261 / -1.261 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 8 0.973 / 0.973 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 9 1.268 / 1.268 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 Member Displacement Span Check Member Length Max Relative Displacement Span Method 1 1 15.811 0.152 L/624 2 15.811 0.213 L/445 3 30.000 0.033 L/3673 4 1.581 0.162 L/117 5 1.581 0.155 L/122 581 E Technology Ave, C1500 | Orem, UT 84097 | 925-787-3067 | www.rightangleeng.com | Page 6 of 7 6 7.070 0.000 L/9692117605 7 7.070 0.000 L/13574500656 8 3.535 0.000 L/8460292598 9 3.535 0.000 L/8484062307 Member Stresses Member Axial Stress (Min/Max) Torsion Stress (Min/Max) Shear Stress Y (Min/Max) Shear Stress Z (Min/Max) Top Bending Moment Z (Min/Max) Bottom Bending Moment Z (Min/Max) 1 0.563 / 0.729 0.000 / 0.000 -0.168 / 0.131 -0.000 / -0.000 -1.387 / 1.568 -1.568 / 1.387 2 0.595 / 0.795 0.000 / 0.000 -0.144 / 0.140 -0.000 / -0.000 -2.464 / 1.569 -1.569 / 2.464 3 -0.733 / -0.435 0.000 / 0.000 -0.001 / 0.001 -0.000 / -0.000 0.000 / 0.132 -0.132 / 0.000 4 -0.010 / 0.000 0.000 / 0.000 -0.047 / 0.000 -0.000 / -0.000 -0.448 / 0.000 0.000 / 0.448 5 -0.010 / 0.000 0.000 / 0.000 0.000 / 0.047 0.000 / 0.000 -0.448 / 0.000 0.000 / 0.448 6 -0.162 / -0.162 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 7 -0.210 / -0.210 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 8 0.162 / 0.162 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 9 0.211 / 0.211 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 0.000 / 0.000 581 E Technology Ave, C1500 | Orem, UT 84097 | 925-787-3067 | www.rightangleeng.com | Page 7 of 7