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27-! <br /> Project: Davion Washington -- Job#: 19-11838 <br /> pf- Date: 10/29/2019 Engineer: DW <br /> Wind Calculations <br /> Per ASCE 7-10 Components and Cladding <br /> Input Variables <br /> Wind Speed 145 mph <br /> Exposure Category C <br /> Roof Shape Gable <br /> Roof Slope 23 degrees <br /> Mean Roof Height 14 ft <br /> Building Least Width 53 ft <br /> Effective Wind Area 13.3 sf <br /> Roof Zone Edge Distance,a 5.3 ft <br /> Controlling C&C Wind Zone Zone 2 <br /> Design.Wind Pressure Calculations <br /> Wind Pressure P=qh*(G*Cp) <br /> qh=0.00256*Kz*Kzt*Kd*VA2 (Eq.30.3-1) <br /> Kz(Exposure Coefficient)= 0.85 (Table 30.3-1) <br /> Kzt(topographic factor)= 1 (Fig.26.8-1) <br /> Kd(Wind Directionality Factor)= 0.85 (Table 26.6-1) <br /> V(Design Wind Speed)= 145 mph (Fig.26.5-1A) <br /> Risk Category= II (Table 1.5-1) <br /> qh= 38.9 psf <br /> 0.6*qh= 23.33 <br /> Standoff Uplift Calculations <br /> Zone 1 Zone 2 Zone 3 Positive <br /> GCp= -0.90 -1.68 -2.58 0.49 <br /> Uplift Pressure= -20.91 psf -39.23 psf -60.15 psf 16.00 psf <br /> Attachment Dead Load= 3.00 psf 3.00 psf 3.00 psf <br /> Max Rail Span Length= 4.00 4.00 0.00 <br /> Longitudinal Length= 3.33 3.33 3.33 <br /> Attachment Tributary Area= 13.33 13.33 0.00 <br /> Attachment Uplift= -255.00 -499.00 0.00 <br /> Lag Screw Uplift Capacity,Check <br /> Fastener= 5/16 inch <br /> Number of Fasteners= 1 <br /> Minimum Threaded Embedment Depth= 2.5 inch <br /> Withdraw Capacity Per Inch= 205 Ib (NDS Eq 12.2-1) <br /> Allowable Withdraw Capacity= 820 Ib (NDS Eq 11.3-1) <br /> 820 lb capacity>499 lb demand Therefore,OK <br /> p Lag Screw Shear Capacity Check <br /> Embedment Depth Reduction Factor 1 <br /> Lateral Force from Gravity Loads= 16 lb <br /> Attachment Lateral Capacity= 250Ib (NDSTable 12K) <br /> 250 lb capacity>16 lb demand Therefore,OK <br /> 3 of 5 <br />