234 



CONTINUOUS GIRDER. 



[CHAP. xm< 



the moments may be at once taken. The formula for the 

 shears are so easy when for any case the moments are known, 

 that it is unnecessary to give tables for these. 



The reader will do well to make himself perfectly familiar 

 with the formulae by calculating the moments for various cases, 

 and comparing with the following tables. We give the prac- 

 tical case of variable end spans n I and equal intermediate 

 spans I. 



TABLE FOB MOMENTS "UNIFORM LOAD OVER ANY SINGLE SPAN. 

 Coefficients of-wV from table. End spans n 1. 



Supports counted from left. 



The above table can be easily extended to include any num 

 ber of spans. It is precisely the same as the table of Art. 140, 

 and, in fact, includes that table. We have only to make n 1 

 and we have at once the table for equal spans. Suppose we 

 take five spans, load in second from right. From the smaller 

 table we have at once for the denominator of the coefficient 

 of w P, 4 (45 + 104 n + 60 n z ). Then from the other table 

 we have at support 1 from left M x = 0, 



(l+2ri)wF 



at support 2, (L Z = . ,..: 1Avt , gn .>, 

 4 (4o + 104 n + 60 n*y 



