Members with bending as the main deformation are called beams; Truss is a kind of structure with hinged members at both ends. Truss beam is a kind of structure widely used in bridges and buildings, which is composed of many web members.

1 beam

Supported by bearings, the external forces are mainly transverse forces and shear forces, and the members with bending as the main deformation are called beams.

2. truss?

Trusses are widely used in exhibition space ceilings, exhibition walls, exhibition platforms, skeletons, gatehouses and special decorations. Trusses mainly include steel truss, aluminum truss, open deck truss, plug-in truss, plum blossom truss, tooth column truss and so on.

3. Truss beam

Truss beam is an important structural frame specially used for bridge construction. Truss beam bridge in English generally adopts truss bridge as the main load-bearing structure, which is called truss bridge for short.

Wood truss was used for truss bridges in the early days, but it is not widely used now because of its perishable wood, low strength and small spanning capacity. Generally speaking, the most modern truss bridge is steel structure. In recent 20 years, prestressed concrete truss bridges have also developed. Because the tie rods of reinforced concrete truss bridges are prone to cracks, the tie rods of reinforced concrete truss bridges are rarely built

Beam classification:

1. Functionally, there are structural beams, such as foundation beams, frame beams, columns, load-bearing walls and other vertical components to form a spatial structure system; There are structural beams, such as lintels, ring beams and connecting beams.

2. According to the structural engineering properties, beams can be divided into shear wall coupling beams, shear wall concealed beams, shear wall frame beams, shear wall supporting frame beams, internal frame beams, beams, masonry wall beams and masonry lintels.

3. From the construction technology, there are cast-in-place beams and precast beams.