Engineering Mechanics

(^296) „„„„„ A Textbook of Engineering Mechanics
Fig. 14.10.
S.No Member Force Nature
1 AE 1.7 W Compression
2 EF 1.2 W Compression
3 FG 0.6 W Compression
4 GB 0.6 W Compression
5 AC 0.9 W Tension
6 CD 0.9 W Tension
7 DB 0.3 W Tension
8 EC 0.6 W Tension
9 FC 0.6 W Tension
10 FD 0.6 W Compression
11 GD 0.6 W Tension
Example 14.5. A truss of 32 metres span is loaded as shown in Fig. 14.11.
Fig. 14.11.
Find graphically, or otherwise, the magnitude and nature of forces in all the members of the
truss.
Solution. Taking moments about the left end support and equating the same,
∴ R 5 × 8 = (1 × 2) + (4 × 4) + (2 × 6) + (3 × 2) = 36
and 5
36
4.5 kN
8
R ==
R 1 = (1 + 4 + 2 + 3) – 4.5 = 5.5 kN