E m = 20 j= 12 m< 2j - 3 (a) Internally Unstable m = 26 j= 15 m< 2j – 3 ANDA G (e) Internally Unstable E B. E m = 21 j= 12 m = 2j -3 (b) Internally Stable m = 27 j= 15 m = 2j - 3 B E m = 25 j= 12 m> 2j -3 () Internally Stable (c) Internally Stable D. G B E A m = 23 j= 12 m> 2-3 m = 16 j= 10 m< 2j - 3 m = 17. j= 10 m = 2j - 3 (d) Internally Unstable (g) Internally Unstable (h) Internally Stable FIG. 4.12

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Q: (a) (b)

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Plane and Space Trusses

In civil engineering, a truss is the most important structure that forms the most fundamental member of any building structure and commercial complexes. Trusses are composed of individual members or links that are interconnected by suitable joints, such as rivets, welds, or bolts, and nuts. In trusses, the interconnection leads to the formation of a series of triangles joined together such that all the triangular members behave as a single rigid body. In a simple truss, three members are connected to form a truss member. In trusses, the force always acts at the joints or the interconnection between the individual members.