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Loyd W. Martin Professional Engineer, Inc. <br />9924 Universal Boulevard #224-406 Orlando, FL 32819 Tel:1.310.464.1804 <br /> Email: loydwmartin@gmail.com www.loydwmartin.com <br />Sht # 4 of 8 <br />p =qh ðGCp ÞðγEÞðγa Þ <br />Kz = 0.9 (Exposure C, Height = 20 ft or less) <br />Kz = velocity pressure coefficient, <br />q h =0.00256KzKztKdKe V 2 <br />Check attachment of Support to Existing Structure for Wind Uplift - Cont'd <br />Tributary Area to Each Solar Mount = 6 ft. x 2.75 ft. = 16.5 sq. ft. ( Max ) <br />Calculate Design Wind Pressure at each support (Wind Speed 130 mph Exposure C): <br />Eq'n 29.4- 7 ASCE 7- 16 <br />Section 26.10.1 ASCE 7- 16 <br />Kzt = Topographical Factor = 1.0 <br />Ke = Ground Elevation Factor = 1.0 <br />V = 130 mph ; VASD = 101 mph Table 1609.3.1 2019 CBC <br />qh =0.00256 (0.9) (1.0) (0.85) (1.0) (101)2 <br />qh =20 psf <br />p 20 psf (- 2.0) (1.5) (0.7) = - 42 psf <br />= - 2.0 (Zone 2 ; Effective Area = 15 sq. ft. ) <br /> = Exposure Factor = 1.5 <br />GCp = Solar Array Pressure Equalization Factor = 0.7 Fig. 29.4- 8 ASCE 7- 16 <br />Design (Factored) Uplift at each support = 0.6 x 693 lbs = 416 lbs <br />Nominal (Unfactored) Uplift at each support = 42 psf x 16.5 sq. ft. = 693 lbs <br />Note: Section 2.4.1 of ASCE 7- 16, Basic Load Combinations for Allowable Stress <br />Load per lag screw = 416 lbs / 1 = 416 lbs <br />Design. Note: Applicable Load Combination #5 (D + 0.6W) <br />p =qh ðGCp ÞðγEÞðγa Þ <br />Eq'n 26.10- 1 ASCE 7- 16 <br />Note: <br />Kd = Wind Directionality Factor = 0.85 <br />GCp ) <br />γE <br />γa <br />= <br />Exp. 3-31-19 <br />No. C58724 <br />NITRAMW.DYO <br />REGISTEREDPROFESSIONALENGINEER <br />C <br />V <br />L <br />FOETATS <br />ALIFORNIAICIL <br />123 <br />2022- 3209 Plug It In Solar Chad Barker Date: August 09, 2022 <br />2014 N Flower St <br />09/12/22