330 



PORTAL POSTS PARTIALLY FIXED. 



Art. 166. 



1/ 2 C 2 4-(7C) 



(143) 

 Ely=y 2 M 2 x 2 y Q R 2 x 3 +C 2 x+(C 3 =Q) (144) 



C 2 is given by equation (143). 



There is nothing in the derivation of equation (115) which 

 will prevent its use in this case, in fact, the same relation may be 

 derived from equation (140). We have then x 2 =^e and taking 

 moments about the upper point of inflection. 



Mf=E& and M 2 '=R 2 'Xi' (same as 94). (145) 



Q == B 2 c +^-% Xl (146) 



Making x=a and substituting (145) and (146) in (144) 



R 2 x i acy 2 Qa(ac) 2 





 ( 



&> 



a R 2 T / 12/1 



JJJ J_ J 



similarly 



Now since R 2 =H, R 2 '=H', H+H'=R+P and y 1 =y 1 ' .... (149) 



4 



JT"' ~~ a'/la'da'+c 7 ) aj/Ca'+c')] 



(150) 



+ 1 



If I=r both drop out of the equation. 



If the supports are on a level a=a' and c c'. 



