REACTIONS FOR UNIFORM LOADS. 



Art. 48. 



/OO /6s 



ff. 



In Fig. 47 the resultant of 

 the uniform load acts at its 

 middle or 14 ft. from A and 6 

 ft. to the left of B. * ** 



-- ZO' -- *1 8' 

 M& 



FIG. 47. 

 M A = 3000 X 28 + 2800 X 14 - 20fl 2 = 



R 2 ==I^o = 6160 Ibs. 

 Assuming 72 1 to act upward, 



- 2800X6 + 3000x8 = 0. 

 -360; 7^i acts downward. 

 Graphically, the solution of this problem is like that of 

 Fig. 43, the resultant of the uniform load being used as one load, 

 and the 3000 Ibs. as another. 



R l= = -~= -360; 



