50 LIVE-LOAD STRESSES 



values of these stresses are the influence ordinates for a 

 one pound load at U\. In an exactly similar way the in- 

 fluence ordinates for a unit load at U t , U* t U 4 , and C7' 4 are 

 determined. The influence lines are straight from /'<> to 



I}'*. Table A gives the influence ordinates for all members 

 and also for the horizontal and vertical components of tho 

 reaction at the left hinge. The angle 6 is the inclination 

 of this reaction with the vertical. 



The calculation of the live-load stresses in any one mem- 

 ber is typical. The member UiL 4 is taken. The influence 

 line for this member is drawn to scale hi Fig. 15 by use of 

 the influence ordinates from Table A. The salient points 

 occur below panel points U t , (7 4 , and U f *. The distance 



