Plain Truss

Truss: A truss is an assembly of straight members joined at their ends carries loads primarily through axial forces (tension & compression) in the members. A truss can carry heavy loads compared to its own weight.

Plane Truss:

All members and loads lie in the same plane then that type of truss called planar truss.

The materials used in trusses include timber, steel & aluminium. The members in a truss can be joined by bolts, metal nail plates in the form of a single large pin. Joints in a truss are usually located at the ends of the members.

Plain truss


A real truss can often be analyzed as an ideal truss.

Assumptions for an ideal truss:

  1. All members of a truss are straight and can be represented by lines (which have no width).
  2. Joints occur only at the ends of the members. Joints can be represented by points (which have no size).
  3. All joints are formed by friction less pin.
  4. The weight of each member is applied at the ends of the members, or the weight of each member is negligible.
  5. Only concentrated loads can be applied to a truss and they are applied at the joints.
  6. For a planar truss, all members and loads lie in the same plane. For a space truss, the members are not co-planar and the directions of the loads are arbitrary.

Plain Truss for BTech 

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