The Dodam-Yeongcheon 480 m long railway bridge was designed as a multi-span simply-supported structure. Combination of five steel spans – alternate three bowstrings and two under-slab trusses. This concept, devised by SYSTRA during the design phase of the tender, creates an impression of a wave over the Namhan river that is in harmony with the surrounding mountains.
The railway bridge on the Dodam-Yeongcheon line, with a total length of 480 m, carries a double-slab track with a design speed of 250 km/h.
It consists of three alternating arches and two trusses under the slab. The first (100 m), third (120 m) and fifth (100 m) single spans are buttresses, while the second and fourth spans (80) are underslab trusses.
SYSTRA scope of work was Basic & Detailed structural Design for the 4 bridges of the lot.
The Namhangang railway bridge over Perennial Namhangang river (sometimes called Dodam Bridge) has required the greatest attention from the design team. It is a truss arch composite railway bridge. The deck and the truss arch are made of steel and the piers are in concrete and are ancored in shallow foundations.
Project key figures
- Total length: 480m (combination of arch and truss)
- Number of tracks: double track
- Main span: 120m long
- Total span: 100(arch) + 80(truss) + 120(arch) + 80(truss) + 100 (arch)