Question

K H G 300 lb o Question 3 (20 points) Determine the force in members BC, CJ, IJ, CH, and CD of the 2 ft truss. State if the members are in tension or compression. с B D F ΙΕ -1. Sft -1.5 ft -1.5 tt-1.56 1.5 -- 1000 lb 1200 lb 1200 lb 1200 lb 1200 fb

Answer 1

solution: fago. faj I 3ool! 2.5 f. CJ 2ft Gt E Mc =0; 1.5 foc C Elussaf 1.Sit 1:51 120046 1200lb 12oolb zoalb 1200840s to 300x2 + fog X2 -1200 x los -1200* 3 - 600 + 2 faj 1800 3600 - 540o =0 10800-600 2 fgg fqj 10200 2 Ans 1200 -1200-1200 = ffy = Sloolb. (T) # { fy=0; feyt (27/5) ) -12.00 fej= 4800 x 2.5 feja 6ooo lb (T) 오 Ans t> Efx-0; - fiy fes (his first) - fec 300 -sloo - Gobox les fgc - 300 =0 2.5 - fec - 9000 =0 foc = =-9000 lb for = 9ooo lb (c) Ans

pag S FHI H zoolb. 2.5 & EmHro; fet " (200l6 1200 lb 1200lb Ans fed - feq X2-1200 x1.5 – 1280 x30 - FCD X2 -1800 - 3600_0 fco= 2700 lb (e) ofega - FHL 3.s) - 1200 1200 - 1200 =0 - few (3.s) - 3 - 36000 -5400 .-2700 lb 2 +7 Efy = 0; fCH = - 4500 lb, feH=4500 lb (c) Ans

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