. Practical structural design; a text and reference work for engineers, architects, builders, draftsmen and technical schools;. 35 40 45 Latitude in Degrees Fig. 155. — Snow Load on Roofs for Dififerent• Latitudes 234 PRACTICAL STRUCTURAL DESIGN roofs, plus the recommended snow load; for a high wind maysucceed a heavy sleet. Not all engineers use the snow load inaddition to the wind load, arguing that a high wind will blowaway the snow. The possibihty, however, of a high wind follow-ing sleet, which cannot be blown away, must be considered. Aminimum of 10 lbs. per sq. ft. should be used except
. Practical structural design; a text and reference work for engineers, architects, builders, draftsmen and technical schools;. 35 40 45 Latitude in Degrees Fig. 155. — Snow Load on Roofs for Dififerent• Latitudes 234 PRACTICAL STRUCTURAL DESIGN roofs, plus the recommended snow load; for a high wind maysucceed a heavy sleet. Not all engineers use the snow load inaddition to the wind load, arguing that a high wind will blowaway the snow. The possibihty, however, of a high wind follow-ing sleet, which cannot be blown away, must be considered. Aminimum of 10 lbs. per sq. ft. should be used except in locaUtiesmentioned on Fig. 155. A sleet storm may follow a heavy snow-storm, and, in its turn, be followed by a heavy Fig. 156 Wind on a Curved Roof In Fig. 156 is shown the graphical method to follow in obtain-ing the reactions for a roof having curved chords. First find the inclination of each panelof the top chord in degreesand find the normal compo-nent of the wind on eachslope. Multiply the area ofeach panel by the normalforce of the wind on the paneland set this off at each end ofthe panel (, at each joint)and complete each parallelo-gram of forces. Draw the dot-ted lines, representing the re-sultant for each (h) draw the polar diagram. The line ed is parallel with theresultant at the joint DEP. The line dc is parallel with the re-sultant at the joint CDR, etc. The length of each line is equalto the amount of the resultant wind force at the joint throughwhich the resultant passes. Connect the points ae and the direc-tion of the resultant wind force on one side of the roof is found,and its amount. At (c) draw the equilibrium polygon. The line o2 is parallelwith the Une oh of
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