Question

3m 6.9 and 6.10 Determine the force in each member of the truss shown. State whether each member is in tension (1) or compression (C). A 12.5 kN 12.5 kN 12.5 kN 12.5 KN 8 KN Fig. P6.9 2.5 m Fig. P6.10 6.11 Determine the force in each member of the Gambrel roof truss shown. State whether each member is in tension (T) or compression (C). 600 lb 600 lb 600 lb 2 ft 4 in. 300 lb B 300 lb OIL G H 300 lb |--8 ---8---8---8-- Fig. P6.11 6.12 Determine the force in each member of the Howe roof truss shown. State whether each member is in tension (T) or compression (C). - Fig. PE 6.13 Determine the force in each member of the roof truss shown. State whether each member is in tension (T) or compression (C). 6m- 6m 6m- 1.2 kN 2.4 kN F

6.10
reactions and all internal forces

Answer 1

6.10 solution:

JOint D Fep 12.SKN 2S FpG 12 3KN 2.S S'9 -(T) 12.Sx6 2 S 30KN FED 30 KN 12.5x6.S 32-3 kN 232-SkN FpG 2.S Joint G Feen 32.5kN EF20 ens (T) Ce) 2 32.SKN FFGE Joint c: 12 SKN BF(2-Sm) 1661m 39.81 FED 301N FoF K BeF -tan' BF +TEFY-012.5k N-FE Sin3-0 12.5KN-FeSin 39,gio FeF -19.S26 KN 19.kM

F0j 30KN-FBC FeF C 3 KN-fec-G19.526 KN) cas 39.81 F6c- 45KN Joint F: 6-S f19.5a 39-81 EF-32-5N 9.526)a 2.S TEF 2-46,5 KN 22.SKN FEF FEF 18.8KNC +1E Fyzo 2.5 2.S BF 6EF(32.5 kp)- (19. 5261)ein 39. 6 5 - 2.S FBF (4.Sk)-2.S1kN-12, SKNEG feE +6.25KN FeE 25KNT) Joint B: FAB 3/2SKN 2 S m YSI.34 z 6-25 KN tandz 2m feE +1 2Fy o12.5KN-6.25 KN-FREnS1.30 Fec -24 KN FeE 24 kN c FAB t60kNFAB 601N

FRE fee 24 KN Jont E: 48 75KN EFy 20 FaE- (A4KNDSINS 134- (485KN) 2 .S FAE+37.S kN 37 5 KN CT AE