204 RESISTANCE OF MATERIALS 



30 Ib./f t. 2 of vertical projection, gives for a roof of one-half pitch an equivalent 

 load of 22.4 lb./ft. 2 of roof surface. 



Assume the left end of the truss to be on rollers and the right end fixed. The 

 total horizontal thrust due to wind load is then carried by the right abutment. 



In drawing the wind-load diagram, first calculate the reactions E^ and R 2 by the 

 method of moments. Having thus determined the point M, the remainder of the 

 diagram is easily drawn. 



310. Solve problem 304 graphically. 



