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Sht # 4 of 7
<br />20173570 Quick Solar Systems Kevin Costello 15049 Residence Date: September 16, 2017
<br /> 9924 Universal Boulevard #224406 Orlando, FL 32819 Tel:1.310.464.1804
<br /> Email: loydwmartin@gmail.com www.loydwmartin.com
<br />Loyd W. Martin Professional Engineer, Inc.
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<br />qh
<br />Check attachment of Support to Existing Structure for Wind Uplift Cont'd
<br />Exp. 3-31-19
<br />No. C58724 NITRAMW.DYO
<br />REGISTEREDPROFESSIONALENGINEER
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<br />FOETATS
<br />ALIFORNIAICIL
<br />21
<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 7-22
<br />Kz = velocity pressure coefficient
<br />p =qh ðGC p ÞðγE Þðγa Þð
<br />=0.00256 Kz Kzt Kd Ke V2
<br />Note:
<br />Section 29.10.1 ASCE 7-22
<br />Kz = 0.9 (Exposure C, Height = 20 ft or less)
<br />Kzt = Topographical Factor = 1.0
<br />Kd = Wind Directionality Factor = 0.85
<br />Ke = Ground Elevation Factor = 1.0
<br />V = 130 mph ; VASB = 101 mph Table 1609.3.1 2022 CBC
<br />qh =0.00256 (0.9) (1.0) (0.85) (1.0) (101)2
<br />p =qh ðGC p ÞðγE Þðγa Þð
<br />qh =20 psf
<br />p = 20 psf (2.0) (1.5) (0.7) = 42 psf
<br />Eq'n 26.10-1 ASCE 7-22
<br />GCp = 2.0 (Zone 2 ; Effective Area = 15 sq. ft. )
<br />GCp = Exposure Factor = 1.5ðγE
<br />GCp = Solar Array Pressure Equalization Factor = 0.7ðγa Fig. 29.4-8 ASCE 7-22
<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 7-22, 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)
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<br />AG
<br />Exp. 3-31-19
<br />No. C58724 NITRAMW.DYO
<br />REGISTEREDPROFESSIONALENGINEER
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<br />FOETATS
<br />ALIFORNIAICIL
<br />215
<br />2023-1768 Solar Plan Design Kevin Newland Residence Date: March 22, 20232023-1820 Solar Plan Design Andrea Dorn Residence Date: March 23, 20232023-1823 Solar Plan Design Chris Harvey Residence Date: March 23, 20232023-3487 Axis Solar Cabral Residence Date: May 27, 2023
<br />2743 N Flower St
<br />10/18/2023
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