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Home My WebLink AboutPV2022-093 - Calcs6/13/2022 DEPINHO ROOFING & SOLAR Attn.: To Whom It May Concern re job: GEORGE HEUSER 1419 DOLPHIN TERRACE, CORONA DEL MAR, CA 92625 Mt 1711-01) Current Renewables Engineering BUILDING DIVISION JUN 1 6 2022 BY: D.A. The following calculations are forth structural engineering design of the photovoltaic panels and are valid only for the structural info referenced in the stamped plan set. The verification of such info is the responsibility of others. After review, I certify that the roof structure has sufficient structural capacity for the applied PV loads. All mounting equipment shall be designed and installed per manufacturer's approved installation specifications. Design Criteria: Code: 2019 CBC ASCE 7-16 Live Load: 20 psf Ult Wind Speed: 96 mph Exposure Cat: D Ground Snow: 0 psf Min Roof Snow: NA r��p,JlHgg�\ w C 84486 Current Renewables Engineering Inc. Professional Engineer au projects@creng.solar sTgr C1b1L- EXP.09/30/2023 1960 Chicago Ave, Suite D15, Riverside, CA 92507 www.currentrenewableseng.com 951.254.5655 INTEGRITY ;' PROFESSIONALISM i CUSTOMER EXPERIENCE Roof Properties: Roof Type = Roof 1 Flat Material Roof Pitch (deg) = 1 Mean Roof Height (ft) = 13 Attachment Trib Width (ft) = 2.75 Attachment Spacing (ft) = 4 Framing Type= Rafter Framing Size = 2x14 Framing OC Spacing (in.) = 16 Section Thickness, b (in.) = 1.5 Section Depth, d (in.) = 13.25 Section Modulus, Sx (in .A3) = 43.9 Moment of Inertia, Ix (in .A4) = 290.8 Framing Span (ft) = 20 Deflection Limit D+L (in.) = 4 Deflection Limit S or W (in.) = 2.67 Framing Upgrade = Adequate Sister Size = NA Wood Species = DF #2 Wood Fb (psi) = 900 Wood Fv (psi) = 180 Wood E (psi) = 1600000 CD (Wind) = 1.6 CD (Snow) = 1.15 CM=C,=CL=C;= 1.0 CF = 1.0 Cf. = 1.00 Cr = 1.15 F'b_wind (psi) = 1656 F'b_snow (psi) = 1190 F'v_wind (psi) = 288 F'v_snow (psi) = 207 M_allowable_wind (lb-ft) = 6057 M_allowable_snow (lb-ft) = 4353 V_allowable_wind (Ibs) = 3816 V_allowable_snow (Ibs) = 2743 1600000 Load Calculation: 1960 Chicago Ave, Suite D15, Riverside, CA 92507 www.currentrenewableseng.com { 951.254.5655 INTEGRITY a PROFESSIONALISM CUSTOMER EXPERIENCE Dead Load Calculations: Panels Dead Load (psf) = 3.0 Roof 1 Roofing Weight (psf) = 2.0 Decking Weight (psf) = 2.0 Framing Weight (psf) = 3.4 Misc. Additional Weight (psf) = 1.0 Existing Dead Load (psf) = 8.4 Total Dead Load (psf) = 11.4 Wind Load Calculations Ultimate Wind Speed (mph) = 96 Directionality Factor, kd = 0.85 Topographic Factor, kzt = 1.0 Roof 1 Velocity Press Exp Factor, kz = 1.03 Ground Elevation Factor, ke = 1.00 Velocity Pressure, qz (psf) = 20.7 Array Edge Factor, yE = 1.25 Solar Equalization Factor, ya = 0.70 External Pressure Up, GCp_1= -1.6 External Pressure Up, GCp_2 = -2.15 External Pressure Up, GCp_3 = -2.9 External Pressure Down, GCp = 0.25 Design Pressure Up, p_1(psf) _ -28.9 Design Pressure Up, p_2 (psf) _ -38.9 Design Pressure Up, p_3 (psf) _ -52.4 Design Pressure Down, p (psf) = 16.0 Tilt Up Array �Lp Lp (ft) = 5.5 < 6.7 c w (deg) = 2.0 < 35 h1(in.)= 6.0 <24 h2 (in.) = Ee 8.0 <48 ASCE 7-16 Sec 29.4.3 is Applicable. h (ft) = 13.0 hp (ft) = 0.0 yp=min(1.2,0.9+hpt/h)= 0.9 yc = max(0.8 , 0.6+0.06Lp) = 0.9 yE = 1.50 (GCrn)nom = 1.4 1960 Chicago Ave, Suite D15, Riverside, CA 92507 www.currentrenewableseng.com ) 951.254.5655 INTEGRITY PROFESSIONALISM i CUSTOMER EXPERIENCE Design Pressure, p (psf) _ -36.3 Hardware Checks: Lae Screw Checks: Roof 1 Ref. Widthrawal Value, W (lb/in) = 266 (CM =Ct=Ceg=1.0)CD= 1.6 Adjusted Widthrawal Value, W' (Ib/in) = 426 Lag Penetration, p (in.) = 2.5 Allowable Widthrawal Force, W'p (Ibs) = 1064 Applied Uplift Force (Ibs) _ -220 Uplift DCR = 0.21 Ref. Lateral Value, Z (Ibs) = 270 (CM =Ct=Co=Ceg=1.0)CD= 0.9 Adjusted Lateral Value, Z' (Ibs) = 243 Applied Laeral Force (Ibs) = 1 Angle of Resultant Force, a (deg) = 90 djusted Interaction Lateral Value, T. (Ibs) = 1064 Lateral DCR = 0.00 Roof Framing Checks: Force Checks: LC1: D+S LC2: D+0.6W Roof 1 Applied Moment (lb-ft) = 846 Applied Shear (Ibs) = 145 Allowable Moment (lb-ft) = 4353 Allowable Shear (Ibs) = 2743 Moment DCR = 0.19 Shear DCR = 0.05 Applied Moment (lb-ft) = 1756 Applied Shear (Ibs) = 251 Allowable Moment (lb-ft) = 6057 Allowable Shear (Ibs) = 3816 Moment DCR = 0.29 Shear DCR = 0.07 LC3: D+0.75(5+0.6W) 1960 Chicago Ave, Suite D15, Riverside, CA 92507 www.currentrenewableseng.com � 951.254.5655 INTEGRITY PROFESSIONALISM ; CUSTOMER EXPERIENCE Job Code: GEORGE HEUSER 5of6 Applied Moment (lb-ft) = 1529 Applied Shear (Ibs) = 224 Allowable Moment (lb-ft) = 6057 Allowable Shear (Ibs) = 3816 Moment DCR = 0.25 Shear DCR = 0.06 LC4: 0.6D+0.6W Applied Moment (lb-ft) = 447 Applied Shear (Ibs) = 104 Allowable Moment (lb-ft) = 6057 Allowable Shear (Ibs) = 3816 Moment DCR = 0.07 Shear DCR = 0.03 Deflection Checks (Service Level): LC1: D+L LC2: S LC3: W (Down) LC4: W (Up) Seismic Check: Existing Weight: Roof 1 Deflection Limit (in.) = 4 Deflection DCR = 0.05 Deflection (in.) = 0.00 Deflection Limit (in.) = 2.67 Deflection DCR = 0.00 Deflection (in.) = 0.09 Deflection Limit (in.) = 2.67 Deflection DCR = 0.03 Deflection (in.) _ -0.08 Deflection Limit (in.) = 2.67 Deflection DCR = 0.03 See Attached for Framing Analysis Results. Wall Weight (psf) = 17 Tributary Wall Area (ftZ) = 1100 Total Wall Weight (Ibs) = 18700 Roof Weight (psf) = 8 Roof Area (ft) = 2800 Total Roof Weight (Ibs) = 23565 1960 Chicago Ave, Suite D15, Riverside, CA 92507 www.currentrenewableseng.com 1 951.254.5655 INTEGRITY i PROFESSIONALISM '+ CUSTOMER EXPERIENCE Current Rr,')r r x c aR j =14, Total Existing Weight (Ibs) = 42265 Additional PV Weight: Total Additional PV Weight (Ibs) = 3049 Weight Increase: (Existing W +Additional W)/(Existing W) = 107% Job Code: GEORGE HEUSER 6of6 The increase in weight as a result of the solar system is less than 10% of the existing structure and therefore no further seismic analysis is required. Limits of Scope of Work and Liability: Existing structure is assumed to have been designed and constructed following appropriate codes at time of erection, and assumed to have appropriate permits. The calculations produced are only for the roof framing supporting the proposed PV installation referenced in the stamped planset and were completed according to generally recognized structural analysis standards and procedures, professional engineering and design experience, opinions and judgements. Existing deficiencies which are unknown or were not observable during time of inspection are not included in this scope of work. All PV modules, racking, and mounting equipment shall be designed and installed per manufacturer's approved installation specifications. The Engineer of Record and the engineering consulting firm assume no responsibility for misuse or improper installation. This analysis is not stamped for water leakage. Framing was determined based on information in provided plans and/or photos, along with engineering judgement. Prior to commencement of work, the contractor shall verify the framing sizes, spacings, and spans noted in the stamped plans, calculations, and cert letter (where applicable) and notify the Engineer of Record of any discrepancies prior to starting construction. Contractor shall also verify that there is no damaged framing that was not addressed in stamped plans, calculations, and cert letter (where applicable) and notify the Engineer of Record of any concerns prior to starting construction. 1960 Chicago Ave, Suite D15, Riverside, CA 92507 www,currentrenewableseng.com 951.254.5655 INTEGRITY PROFESSIONALISM ' CUSTOMER EXPERIENCE