Truss Truss is a plane or spatial structure composed of straight bars, generally using triangular elements. Truss members mainly bear axial tension or pressure, so when the span is large, compared with solid web beams, they make full use of the strength of materials, save materials, reduce their own weight and increase their stiffness.

The advantage of truss is that the members mainly bear tension or pressure, which can give full play to the role of materials, save materials and reduce the weight of the structure. Commonly used are steel truss, reinforced concrete truss, prestressed concrete truss, wood truss, steel-wood composite truss and steel-concrete composite truss.

Height-span ratio of truss:

General three-dimensional truss is112 ~116, three-dimensional arch is 1/20~ 1/30, and tensioned three-dimensional arch is1/30 ~/.

Trusses are widely used. When choosing the truss form, the purpose, material, support mode and construction conditions of the truss should be considered comprehensively. The principle of choosing the best form is to minimize the materials and labor used in manufacturing and installation on the premise of meeting the use requirements.