We define a steel lattice truss or steel truss as a structural component that acts as a load-bearing element in a building. The truss consists of a set of bars connected at nodes which are fixed with stiffeners. This means that they do not withstand bending moments or excessive in-plane forces (plane trusses). The bars and nodes form a rigid body that is not deformable in the plane. However, a truss can be a three-dimensional structural element that will also be able to resist out-of-plane forces (space-frame truss).
In principle, bars, and nodes form triangles, either in 2D or 3D, we know that the triangle is the “strongest” geometric shape.
In a structure, a steel truss can have several functions, depending on its position and geometry, and can be:
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