With the cable truss, we have crossed an important line of demarcation in our progression towards system transparency and the dematerialization of structure. While cable trusses vary widely in both design and configuration (vertical, overhead, vaulted and domed forms are all easily achieved), they are most often characterized by the spreader struts that act as their only compression member. Cable trusses rely on the introduction of prestress forces into the tensile elements of the truss to provide stability. Depending upon conditions of span and load, the required prestress forces can be quite high, and must be resisted by adjacent building structure. It is, therefor, important to identify these forces and communicate them to building engineers very early in the design process.
Here cable trusses are located at each vertical line of the glazing grid to resist lateral loads on the glass wall.
Cast stainless spider fittings at the outboard end of the spreader point fix glass to the structural system. The cable trusses are integrated with a pipe frame in this hierarchical structural system.
A horizontal application of a cable-truss system is used here to support a glass roof enclosure. Note the point-fixed clamped glazing system.
In yet another variation, a horizontal cable truss is used to brace a suspended grid of steel mullions that provide continuous support to an integrated glazing system, a strategy that combines transparency with economy.