Laserfiche WebLink
Check attachment of Support to Existing Structure for Wind Uplift - Cont'd <br />Tributary Area to Each Solar Mount = 4 ft. x 2.75 ft. = 11 sq. ft. ( Max ) <br />Calculate Design Wind Pressure at each support (Wind Speed 130 mph Exposure C): <br />p = q h (GC p )(γE )(γ a )Eq'n 29.4-7 ASCE 7-16 <br />q h = 0.00256 K z K zt K d K e V2 Eq'n 26.10-1 ASCE 7-16 <br />Note: <br />K z = velocity pressure coefficient Section 29.10.1 ASCE 7-16 <br />K z = 0.9 (Exposure C, Height = 20 ft or less) <br />K zt = Topographical Factor = 1.0 <br />K d = Wind Directionality Factor = 0.85 <br />K e = Ground Elevation Factor = 1.0 <br />V = 130 mph ; VASB = 101 mph <br />q h = 0.00256 (0.9) (1.0) (0.85) (1.0) (101)² <br />q h = 19.98 psf <br />GC p = -2.0 (Zone 2 ; Effective Area = 15 sq. ft. ) <br />γE = Exposure Factor = 1.5 <br />γa = Solar Array Pressure Equalization Factor = 0.7 Fig. 29.4-8 ASCE 7-16 <br />p = q h (GC p )( γE )( γa ) <br />p = 19.98 psf (-2.0) (1.5) (0.7) = 42 psf <br />Sht # 4 of 7 <br />2023-4335 Precis Solar Rebecca Bennett July 29, 2023 <br /> 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 />1522 N Eastside <br />Ave09/12/23