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page#-5 <br />CALCULATION OF DESIGN WIND LOADS <br />Wind Design Criteria <br />Wind Design Code ASCE 7-10 <br />Wind Design Method Partially/Fully Enclosed Method <br />Basic Wind Speed V 110 mph Fig. 26.5-lA <br />Exposure Category C Section 26.7 <br />Roof Style Gable Roof Fig. 30.4-ZA/B/C-*B <br />Mean Roof Height h 15 ft Section 26.2 <br />Effective Roof Slope 22° <br />Effective Rafter Spacing 24" O.C. <br />Effective Wind Area (1 Module) A 17.6 sf IBC 1509.7.1 <br />Wind Pressure Calculation Coefficients <br />Wind Pressure Exposure Kz 0.85 Table 30.3-1 <br />Topographic Factor Ka 1.00 Section 26.8 <br />Wind Directionality Factor 0.85 Section 26.6-1 <br />Importance Factor I NA <br />Velocity Pressure h qh = 0.00256 (Kz) (Kzt) (Kd) (VU) <br />22.4 psf Equation 30.3-1 <br />Wind Pressure <br />Ext. Pressure Coefficient (Up)-0.88 Fig. 30.4-2A/B/C-5A/BGCp (UP) <br />Ext. Pressure Coefficient (Down)GCp (Down)0.45 Fig. 30.+2A/8/C-WB <br />Design Wind Pressure p P= Clk (GA)Equation 30.4-1 <br />Wind Pressure Up P(UP)-19.6 psf <br />Wind Pressure Down P(down)16.0 psf <br />TALLOWABLE STANDOFF SPACINGS <br />X-Direction Y-Direction <br />Max Allowable Standoff Spacing Landscape 72"39" <br />Max Allowable Cantilever Landscape 24"NA <br />Standoff Configuration Landscape Not-Staggered <br />Max Standoff Tributary Area Trib 20 sf <br />PV Assembly Dead Load W-PV 3 psf <br />Net Wind Uplift af Standoff T-actual -197 lbs <br />Uplift Capacity of Standoff T-allow 637 lbs <br />Standoff Demand/Capacity DCR 30.9% t <br />X-Direction Y-Direction <br />Max Allowable Standoff Spacing Portrait 72"65" <br />Max Allowable Cantilever Portrait 24"NA <br />Standoff Configuration Portrait Not-Staggered <br />Max Standoff Tributary Area Trib 32 sf <br />PV Assembly Dead Load W-PV 3 psf <br />Net Wind Oplift at Standoff T-actual -327 lbs <br />Uplift Capacity of Standoff T-allow 637 lbs <br />Standoff Demand/Capacity OCR 51.3%