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<br />[-'l:~".' fi.~ <br />.,. <br />,., <br />,.. <br />.,:i' <br />..~~: <br /> <br />'2. <br /> <br />If <br /> <br />Main Wind Force Resisting System <br />Figure6-18B Net Pressure Coefficient, eN <br />Open Buildings <br /> <br />0.25 ~ hIL ~ 1.0 <br />Pitched Free Roofs <br />e ~ 450,1= 00, 1800 <br /> <br />III <br /> <br />,L <br /> <br />[ I <br /> <br />Wind <br />Direction <br />=> <br /> <br />y=oo <br /> <br /> <br />rJ <br /> <br />11 <br /> <br />h <br /> <br />f] <br /> <br /> <br />"I <br />[II <br />! I 1 <br />\ <br />i <br />ill <br /> <br /> Wind Direction, g = 00,1800 <br />Roof Load Clear Wind Flow Obstructed Wind Flow <br />Angle, 9 Case <br /> CNW CNL CNW CNL <br /> A l.l -0.3 -1.6 -1 <br />7.50 B 0.2 -1.2 -0.9 -1.7 <br /> A 1.1 -0.4 -1.2 -1 <br />150 B 0.1 -1.1 -0.6 -l.6 <br /> A 1.1 0.1 -1.2 -1.2 <br />22,50 B -0.1 -0,8. -0.8 -1.7 <br /> A 1.3 ..' 0,3. -0,7 -0.7 <br />300 B -0.1 : . -0.9. -0.2 -1.1 <br />CC) .. :!.11 0 <br /> (A) (f.~) .. (M). -0.6 -0,6 <br />37.50 QD ~ (0.6".;r -0.3 -0,9 <br />450 A 1.1 0,9 .-0,5 -0,5 <br />B -0.3 -0.5 -0,3 -0.7 <br /> <br />[J <br /> <br />n <br /> <br />! 1 <br /> <br />III <br />l) ! <br />\) ~ <br /> <br />- I <br />I Minimum Design Loeds for Buildings and Other Structures <br /> <br />IL <br /> <br />4. <br />5. <br />6, <br /> <br />Notes: <br />I. CNW and CNL denote net pressures (contributions from 'op and bottom surfaces) for windward and leeward half of <br />roof surfaces. respectively. <br />Clear wind flow denotes relatively unobstrucled wind flow with blockage less than or equal to 50%. Obstmcted <br />wind flow denotes objects below roofinhibiting wind flow (>50% blockoge). <br />For values of O.belween 7.50 and 450, linear inlerpolation is permitted. For VIIlues of 8 less than 7.5". use <br />monoslope roof load coefficienls, <br />Plus and minus signs signifY pressures acting towards and away from the top roof surface, respectively. <br />All load cases shown for each roof angle shall be Investigated. <br />NOlation: <br />L : horizontal dimension of roof, measured in the along wind direclion, ft. (m) <br />h : mean roof height. ft, (m) <br />'Y : direction of wind, degrees <br />o : angle of plane of roof from horizontal, degrees <br /> <br />2, <br /> <br />11 <br /> <br />3. <br /> <br />67 <br />