Erklärung: Assuming steel members are holding it up, I think it refers to the beams supporting the glass canopy, which may pre-stressed or pre-tensioned (or cable?). The distinction is between members in tension and members in compression. See the second excerpt especially.
http://www.ropescourse.at/leistung_bau.htm
Nach Abschluss der Planungsarbeiten erfolgt der Bau an Bäumen oder an Masten, die wie Telefonmasten im Boden verankert, jedoch aber auch abgespannt werden.
http://72.14.207.104/search?q=cache:TNTv16MtOFcJ:www.reiworl...
Other visual contributions include a curved stainless-steel roof that also serves as a canopy over the toll-booths ... A structural engineering accomplishment of the Mon-Fayette Pedestrian Bridge included the use of stainless-steel rods as the truss-tension and compression diagonals. This use of thin rods provided a light and unobstructed appearance. The rods were pre-tensioned prior to erection with a larger force than the compression force that would be introduced by the truss loads, thus always keeping the rods in tension.
Erklärung: Assuming steel members are holding it up, I think it refers to the beams supporting the glass canopy, which may pre-stressed or pre-tensioned (or cable?). The distinction is between members in tension and members in compression. See the second excerpt especially.
http://www.ropescourse.at/leistung_bau.htm
Nach Abschluss der Planungsarbeiten erfolgt der Bau an Bäumen oder an Masten, die wie Telefonmasten im Boden verankert, jedoch aber auch abgespannt werden.
http://72.14.207.104/search?q=cache:TNTv16MtOFcJ:www.reiworl...
Other visual contributions include a curved stainless-steel roof that also serves as a canopy over the toll-booths ... A structural engineering accomplishment of the Mon-Fayette Pedestrian Bridge included the use of stainless-steel rods as the truss-tension and compression diagonals. This use of thin rods provided a light and unobstructed appearance. The rods were pre-tensioned prior to erection with a larger force than the compression force that would be introduced by the truss loads, thus always keeping the rods in tension.
The translation workplace 
