A complex structural composition
The Y-Bridge in Ho Chi Minh City was built in 1941 and is named for the fact it has three branches which connect at a central platform, forming a Y-shape in plan. The three-legged structure, which straddles two canals, was to be widened to double its capacity from two to four lanes and repaired to meet current Vietnamese design specifications. The branches of the bridge are between 200 m and 300 m long, with spans ranging from 16 m to 30 m.
Added to the complexity was the fact that the structural composition of the three branches differed, with a combination of concrete beams, steel spans and even spans which had formerly housed equipment to control the original opening span. One of the branches had been rebuilt in 2008 and the remaining parts of the original bridge had been strengthened in 1992 by Freyssinet, by the addition of external post-tensioning.