Most of the trusses are generally used in exhibitions, Canton fairs, zeniths, display walls, display platforms, gate buildings and skeletons.
According to the shape of truss, it is divided into:
1. Parallel chord truss (it is easy to arrange double-layer structure; it is conducive to standardized production, but the distribution of member force is not uniform).
2. Bent chord truss (for example, parabolic truss beam, whose shape is the same as the bending moment diagram of simple supported beam under uniform load, with uniform rod force distribution, economic material use and complex structure).
3. Triangular truss (the distribution of pole force is more uneven, the structure layout is difficult, but the slope meets the needs of roof drainage).