What defines the shape of bowstring trusses?

Bowstring trusses are characterized by their unique structural design, which includes a top chord that is typically straight and a bottom chord that is curved. This configuration gives the truss its distinctive bow-like shape, which is effective in providing support over large spans. The curved design allows for the distribution of loads efficiently, making bowstring trusses popular in various construction applications, particularly in roof systems for sports arenas, auditoriums, and warehouses.

The presence of vertical support beams, flat horizontal beams, or reinforced trusses with angles does not adequately describe the defining feature of bowstring trusses. Instead, it is specifically the combination of the straight top chord and the curved bottom chord that creates their unique structural profile and functional capabilities. This design helps balance the forces acting on the truss while permitting a wider open space beneath it.