610 14TH ST 2025-04-01 - Laserfiche WebLink

Wall Pressure Coefficients, Cp Surface LIB cp Use With Windward wall All values 0.8 qz 0-1 -0.5 qh Leeward wall 2 -0.3 qh >4 -0.2 qh Sidewall All values -0.7 q1, Roof Pressure Coefficients, Cp, for use with qh ti Windward Leeward s. Angle,0(degrees) Angle,0(degrees) Wind Cd Direction h/L 10 15 20 25 30 35 45 >60` 10 15 >20 T Normal <0.25 -0.7 -0.5 -0.3 -0.2 -0.2 0.0° o to Ridge -0.18 0.01 0.2 0.3 0.3 0.4 0.4 0.01 0 -0.3 -0.5 -0.6 a for 0.5 -0.9 -0.7 -0.4 -0.3 -0.2 -0.2 0.01 0 0>10, -0.18 -0.18 0.01 0.2 0.2 0.3 0.4 0.01 0 -0.5 -0.5 -0.6 >1.0 -1.3b -1.0 -0.7 -0.5 -0.3 -0.2 0.01 uo, -0.18 -0.18 -0.18 0.01 0.2 0.2 0.3 0.010 -0.7 -0.6 -0.6 ui dWind Direction h/L Horizontal Distance from Windward Edge Cp Normal to Ridge for <0.5 0 to l✓2 -0.9, -0.18 0<10'and Parallel h/2 to h -0.9, -0.18 j to Ridge for All 0 h to 2h -0.5, -0.18 00 >2h -0.3, -0.18 �J.0 0 to W2 -1.3b, -0.18 N >hi2 -0.7, -0.18 O o 'Value is provided for interpolation purposes. i bValue can be reduced linearly with area over which it is applicable as follows: c `For roof slopes greater than 80°,use Cp=0.8. 0 v p Area,It' Area,m2 Reduction Factor on 0 <100 <9.3 LO p 250 23.2 0.9 >1,000 >92.9 0.8 Notes 0 1. Plus and minus signs signify pressures acting toward and away from the surfaces, respectively. 2. Linear interpolation is permitted for values of LIB,h/L,and 0 other than shown.Interpolation shall only be carried out between a values of the same sign. Where no value of the same sign is given, assume 0.0 for interpolation purposes. 3. Where two values of Cp are listed,this indicates that the windward roof slope is subjected to either positive or negative pressures and the roof structure shall be designed for both conditions.Interpolation for intermediate ratios of h/L in this case shall only be carried out between Cp values of like sign. 4. For monoslope roofs, entire roof surface is either a windward or leeward surface. 5. Refer to Fig. 27.3-2 for domes and Fig. 27.3-3 for arched roofs. 6. For mansard roofs, the top horizontal surface and leeward inclined surface shall be treated as leeward surfaces from the table. 7. Except for MWFRSs at the roof consisting of moment-resisting frames, the total horizontal shear shall not be less than that determined by neglecting wind forces on roof surfaces. FIGURE 27.3-1 (Coninued).Main Wind Force Resisting System,Part 1 (All Heights):External Pressure Coefficients,Cp,for Enclosed and Partially Enclosed Buildings-Walls and Roofs 276 STANDARD ASCE/SEI 7-16