This is an uncommon type of construction
technique as post-tensioning is used to either complement
the tension cord of a conventional steel truss, or simply
to provide the normal post-tensioning effect in a composite
concrete-steel truss design.
Such technique is generally used for extremely
huge span structures.
In an attempt to reduce the weight of
steel trusses in buildings due mainly to the unavailability
of super cranes to building construction sites, engineers
often design a smaller and lighter steel truss which would
be “strengthened” with post-tensioning after
it is being erected.
