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<br />.~\i .,.' <br /> <br />[l.r. <br /> <br />[1 <br /> <br />[J <br /> <br />n <br /> <br />[] <br /> <br />I] <br /> <br />[J <br /> <br />IJ I <br />11 I <br />, <br />, <br /> <br />I) <br /> <br />f] <br /> <br />u <br /> <br />I] <br /> <br />I} <br />[ I <br />I} <br />l) <br /> <br />u <br /> <br />\ <br />j. <br />~ <br />, <br />f <br />~: <br /> <br />[1 <br /> <br />.r <br />, <br />t- <br />.- <br /> <br />A- <br /> <br />Components and Cladding <br />FigUl'e 6-19B Net Pressure Coefficient, CN <br />Open Buildings <br /> <br />0.15 ~ hlL S 1.0 <br />Monoslope Free Roofs <br />e S 450 <br /> <br />III <br /> <br />L <br /> <br />L <br /> <br />~I <br /> <br />I' L 'I <br />hl~ <br /> <br />/////111/11//111// <br /> <br />~I <br /> <br />I" <br /> <br />3 <br /> <br />3 <br /> <br />3 <br /> <br />z <br /> <br />2 <br /> <br />2 <br /> <br />1 <br /> <br />1 l' <br /> <br />2 <br /> <br />J <br /> <br />e < 100 <br /> <br />e ~ 100 <br /> <br /><C""" ~}n." <br /> <br />.~_ ... \0_"!~' -... "l; = .'7'.> b.. \ <br />\.. ,,~;<~; <br /><:> ,n.. S <. <:> . <c. A.. L.... \ <br /> <br />'-6 .l:......o:.. 4,";" ~~""C\ ~::..'<-... <br /> <br />Roof ~el - eN <br />Angle ~a \.Ck!r Win~ FI~.w 0 boIroctod Wind Flow <br />9 Zone 3 Zone 2 Zon.1 Zen. 3 ZOllO 2 Zone I <br /> Sa 2.4 -3.3 \.8 -1.7 1.2 -1.1 I -3.6 0.8 -1.8 0.5 -1.2 <br />O. >a,S4.00' 1.8 .1.7 1.8 -1.7 1.2 .1.1 0.8 -1.8 0.8 -1.8 0.5 -1.2 <br /> >4.0.' 1.2 .1.1 1.2 .1.1 1.2 -1.1 0.5 -1.2 0.5 -1.2 0.5 -1.2 <br /> Sa' 2.2 -3.6 1.7 -1.8 1.1 -1.2 , -5.1 0.8 -2.6 0.5 -1.7 <br />7.S' > .1,!!i: 4.0a' 1.7 .1.8 1.7 -1.8 1.1 -1.2 0.8 -2.6 0.8 -2.6 O.S -1.7 <br /> > 4.00' I.' -1.2 1.1 -1.2 1.1 -1.2 0.5 -1.7 O.S .1.7 O.S -1.7 <br /> Sa' 22 -2.2 1.7 -1.7 1.1 -1.1 I -3.2 0.8 -2.4 o.S -1.6 <br />IS. >811 ~ 4.0..1 1.7 .1.7 1.7 -1.7 1.1 -1.1 0.8 .2.4 0.8 .2.4 0.5 -1.6 <br /> >4.0a' 1.1 -1.1 1.1' -1.1 1.1 -1.1 0.5 -1.6 0.5 .i.6) 0.5 :1.6 ) <br /> Sa' 2.6 .1.8 2 -1.4 1.3 -0.9 I -2.4 0.8 -1.8 o.s -1.2 <br />CV (l;. a'. S 4Aj;!f t\."2 .'.4 JJ 2 -1.4 1.3 .0.9 0.8 .1.8 0.8 -1.8 0.5 -1.2 <br />. ,. 4.0a1 1.3 -0.9 1.3 -C.9 1.3 -0-9 0.5 -1.2 o.s .1.2 0.5 -1.2 <br /> Sa' 2.2 -1.6 1.7 -1.2 1.1 -0.8 J -2.4 0.8 -1.8 O.S -1.2 <br />~. > 811's4.Oal 1.7 -1.2 1.7 .1.2 1.1 .0.8. 0.8 .1.8 0.8 -1.8 o.S -1.2 <br /> > 4.0a1 1.1 -0.8 1.1 .0.8 1.1 -C.8 O.S -1.2 O.S -1.2 o.s -1.2 <br /> <br />Notes: <br /> <br />CII denotes net pressures (contributions from top and bottom surfaces). <br />Clear wind flow denotes relatively unobstructed wind flow with blockage less than or equal to 50%, Obstructed wind flow <br />denoles objects below roof inhibiting wind flow (>50"A> blockage). <br />For values of9 other than those 8hown,linear interpolation is pennilled. <br />Plus and minus signs signifY pressures acting lowards and away from the top roofsurface, respectively. <br />Components and cladding elements shall be designed for positive and negative pressure coefficients shown. <br />Notation: <br />8 : 10% ofleast horizontal dimension or O.4h, whichever is smalle~ but not less than 4% ofleast horizontal dimension or <br />3 ft. (0,9 01) <br />h : mean roof height, ft. (m) <br />L : horizontal dimension of building. measured in along wind direction, ft. em) <br />a : angle of plane of roof from horizontal, degrees <br /> <br />1. <br />2. <br /> <br />3. <br />4. <br />5. <br />6. <br /> <br />MInImum Design Loads for Buildings and Other Structures <br /> <br />71 <br />