94 STRESSES IN A TRANSVERSE BENT 



The approximate weight of the roof per square foot of horizontal 

 projection will be as follows : 



Trusses 3-6 Ibs. per sq. ft. 



Purlins and Bracing 3.0 



Corrugated Steel 2.4 " " 



Roof Lining i .o 



a 



(t 

 t( 



Total 10.0 



The maximum snow load will be taken at 20 pounds, and the 

 minimum snow load at 10 pounds per square foot of horizontal pro- 

 jection of roof.* 



The wind load will be taken at 20 pounds per square foot on a 

 vertical projection for the sides and ends of the building, 20 pounds 

 per square foot on a vertical surface when the wind is considered as 

 acting horizontally on the vertical projection of the roof, and 30 

 pounds per square foot on a vertical surface when the wind is consid- 

 ered as acting normal to the roof. 



The stresses in an intermediate transverse bent will be calculated 

 for the following: 



CASE i. Permanent dead and snow loads. 



CASE 2. A horizontal wind load of 20 pounds per square foot on 

 the sides and vertical projections of the roof, with the columns hinged 

 at the base. 



CASE 3. Same wind load as in Case 2, with columns fixed at the 

 base. 



CASE 4. A horizontal wind load of 20 pounds per square foot on 

 the sides, and the normal component of a horizontal wind load of 30 

 pounds per square foot on the roof, with columns hinged at the base. 



CASE 5. Same wind load as in Case 4, with columns fixed at 

 the base. 



Case i. Permanent Dead and Snow Load Stresses. On ac- 

 count of the limited size of the stress diagram the secondary members 

 have been omitted and the loads applied as shown in Fig. 53. The 



