Architects, engineers and fabricators have asked whether tubing can be formed with both camber and sweep. The answer is yes.
An example of tube bending that induces both camber and sweep can be seen in the sinuous pedestrian bridge in Longview, Florida, shown below. 66 tons of 14in square tube with a wall thickness of 5/8in was curved to a 139ft-8in radius to the following lengths with the corresponding camber: 2 pieces 55.8ft long with a 9/16in camber, 2 pieces 49.3 ft long with a 7/16in camber, 2 pieces 60.2ft long with a 5/8 camber, and 2 pieces 49.3ft long with a 5/8 camber.
Curved plate can also be fabricated with camber. A pedestrian bridge in Chicago linking Millennium Park to the Art Institute of Chicago is an example. 210 tons of 3/8, ½, and 5/8in plate rolled to a 10ft radius forms the bottom of this 620ft long bridge. Designed by architect Renzo Piano, the bridge was fabricated with a 20,000ft radius camber creating a 2.4ft mid-ordinate rise.
Structural steel can be formed into compound bends (bends in two planes), multi-radius bends, helical bends, minimum radius bends, and off-axis bends. Architects aware of these capabilities are increasingly incorporating this special bending in their designs to achieve special structural and aesthetic goals.