34 LIVE-LOAD STRESSES 



the maximum compression S 4 in a vertical post is, therefore, 



*-(&)"-()* 



The coefficients for the stress in any inclined web mem- 

 ber are given by Fig. 9. The quantities for Si and S* are 



8. 



a> shown, and the quantities for S 3 are of the same alge- 

 braic form except that they are of opposite sign through- 

 out. For the usual position of the live load advanced from 

 the right into but not beyond the panel p for maximum 

 stress, the moment sums M \ and M * equal zero, and the 

 numerical values of the maximum tension Si and 5 2 and 

 of the maximum compression S t are given by the following 

 formula: 



, or 5, = 



