Space Trusses

A space truss is a three-dimensional counterpart of a planar truss consisting of members connected at their ends, often using ball-and-socket joints.

The fundamental unit of a space truss is a tetrahedron comprising six members.

Adding a joint and three members to this basic element can create a network of interlinked tetrahedrons, enabling the construction of complex space trusses.

For analysis, the space truss members are considered two-force members only if the external loading is applied at the idealized ball-and-socket joints and the members' weight is negligible.

For welded or bolted connections, the members must intersect at a common point to satisfy the two-force member condition.

When the weight of a member is significant, half of its magnitude is applied as equally distributed vertical forces at both ends of the member.

The equations of equilibrium ensure that the forces and moments acting on the truss are balanced.

The rigidity and determinacy of a space truss necessitate that the number of members and the number of joints are related through an equation.