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Diagram <br /> s h <br /> { P <br /> 0 <br /> S 5 <br />-o Y <br /> ELEVATION <br /> Notation <br /> a= 10% of least horizontal dimension or 0.4h,whichever is smaller,but not less than either 4%of least <br /> horizontal dimension or 3 ft(0.9 m). <br /> o Exception: For buildings with 0=0°to 7°and a least horizontal dimension greater than 300 ft(90 m), <br /> ° <br /> dimension a shall be limited to a maximum of 0.8h. <br /> o h=Mean roof height,in ft(m),except that eave height shall be used for 0<_ 10°. <br /> 0=Angle of plane of roof from horizontal,in degrees. <br /> ° <br /> w <br /> External Pressure Coefficient, (GCp)-Walls <br /> 10 500 <br /> c l Va 1.6 { <br /> 1.4 .1.4 <br />�^ ... -1.2 <br /> c -1.0 <br /> 3i <br /> -0.8 .0.8 <br /> ° -0.6 <br /> o V -0.4 <br /> -0.2 <br /> 3 0 <br /> ca <br /> +0.2 <br /> cL +0.4 <br /> w +0.6 <br /> +0.7 <br /> 8 +0.8 q & 5 <br /> +1.0 +1.0 <br /> o +L2 <br /> b 1 10 20 50 100 200 5001000 <br /> (0.1) (0.9) (1.9) (4.6) (9.3) (18.6) (46.5)(92.9) <br /> Q <br /> Effective Wind Area,ft2 (n ) <br /> Notes <br /> 1.Vertical scale denotes(GCp)to be used with qh. <br /> 2.Horizontal scale denotes effective wind area,in ft2(m2). <br /> 3.Plus and minus signs signify pressures acting toward and away from the surfaces,respectively. <br /> 4.Each component shall be designed for maximum positive and negative pressures. <br /> 5.Values of(GCp) for walls shall be reduced by 10%when 0<_ 10°. <br /> FIGURE 30.3-1 Components and Cladding [h<60 ft(h<18.3 m)]: External Pressure Coefficients,(GCp),for Enclosed and Partially <br /> Enclosed Buildings-Walls <br /> Minimum Design Loads and Associated Criteria for Buildings and Other Structures 335 <br />