PROBLEMS 



429 



Graphic Static s. 



Problem 8. 



5cale of Truss \"*e-C> 

 Scale of Stress 



eooo* izooo* ^X-*- 



5pan 4O-o". Trusses lE-o'opart. 



Load =4o*per sq.fi. ~'"~*\ 



horizontal proj. ^ <---_-_'-""-' 



Algebraic Resolution. 



/! Ff - 11470* * \-X-V 14400* } L 



H = 1-X cos 30- 2-Xcos 30- h&cos 60* p. 1 

 IV= 4 800-4- 2-X sin 30- hX sin 3o-l- sin eo=o. I U, 



^H = - I'Y+ 3'Y-t- \~E COS 6O4?-3 C056O=O. 



2:V=-)-sin6o +2-3sin6o =o. ' 



. 



A[g ebraic J-X = + uuoo. 2-X-+ \ zoooJ hY=- 1 ZAIO ,V Y= - 83 10, h C = E~3 = 

 Graphic. l-** 



