AREA OF CROfiMECTION FOR 1 1. \\GE8 



If h t h lt and h y be taken equal, and the term -r- be 



dn>ppr<l tin- formula may I*- wriu 



- 



That is, t lit* appro \ sees 



equals tin- unit stress times tj,,. depth tim.-* arra 



of one flange plus | of the area of the web plate. Many 



engineers drop the ^ ' from tin* e\pn ---inn. a- it- value 



is small ami it is on the >ide of safety to do so. Chin r* 



include it \\itli th<- i'ira that as the web takes a pan of 



ori/nntal stresses these horizontal stresses should be 



1 in designing the flanges and web splices. \Vh.-r-- 



or >pliccs are use<i on the w-l> it is impossible 



to maintain the full web section, and the web availahli* 



as flange is usually taken as -A which corresponds to a 



:il riv.-t j.it< h of about 4". The preceding formula 

 should be written for the purpose of design: 



M 



c 



/ If! I 



"IT jp . . (1) or A- 



M 





In this formula -- is known as the flange stress, ju-t 



as in the case of trusses th. :it divid 



is the chord stress. 



