- For covering long-span industrial buildings, precast RC trusses with prestressed tie member are often employed. These types of trusses are often advantageous and economical compared to steel trusses for use in coastal areas, where corrosion is the main concern.
- The configuration of the truss depends on the general layout and span of the roof to be covered.
- The members of these trusses are subjected to axial tension or compression, though the top chord may be subjected to additional bending if there are intermediate purlins.
- The bowstring configuration is preferable and economical when compared to polygonal truss configuration. This is because the web members in bowstring configuration are subjected to forces of low magnitude, and the bottom tie is subjected to very high tension and is hence ideal for prestressing.