Győr, belső keleti tehermentesítő út – Mosoni-Duna híd

The Hungarian National Infrastructure Development Private Company Limited (Nemzeti Infrastruktúra Fejlesztő Zrt. – NIF) gave the assignment to design Győr’s eastern relief road and the new Mosoni-Duna river bridge. The Mosoni-Duna river bifurcates from the main stream of Duna between Dunakiliti and Dunacsúny. After circling around Szigetköz the Mosoni-Duna river will conflate back with Duna. The Mosoni-Duna crosses Győr where the relief road demands a new esthetic bridge above the river.
Our company came up with numerous design plans. Ultimately the client and the city choose our cable stayed draft. The most important aspects were the unique look, a modern shape, and to fit well with the city’s development endeavor.
The structure is a cable stayed bridge with single pylon and reinforced concrete substructure. The orientation of the pylon, the single cable plane above the river bed, and the forking of the anchor cables give the unique look for the bridge. The pylon has 67-degree inclination forward and the area of its cross section is shrinking with height.
Length of the structure: 213,6 m
Spans: 144 m and 68 m
Height of the structure: 66,74m
Total weight: 3906 t
Width of the structure: 29,73 m
The capacity of the bridge is 2×2 lanes of roadway, two bicycle lanes and a pedestrian side-walk

The steel technical drawings were made with Trimble’s Tekla Structures 2019i. From the first steps 3D modelling gave us a powerful tool to present, shape and share our idea of the bridge. Although given the complexity of the geometry we encountered numerous obstacles during modeling. We aimed to find the optimal size for the construction segments. We were restricted by the fact that the segments could only be transported on roadways. The river proved to be too shallow to move parts. It also took serious consideration how to achieve the designed shape of the centerline. In the end we decided to use incremental lunching method on temporary supports built on the river bed. The temporary supports will provide the shape of the centerline and optimal cable stress will be reached when the structure is lifted from the supports. We analyzed the difference between a curved and an orthogonal model. The geometrical error at the joints were so negligible that it can be solved with different weld sizes. The hardest part of the modeling process was the pylon. The linearly changing cross section is designed with “T” stiffeners. We had to solve the collision between the stiffeners and the cable anchoring plates while there were no parallel boundary plates. Additionally, to achieve the most slender shape possible we analyzed contractibility. The model gave us a powerful tool to provide just enough space for the building technology of post tension cables.
To create the pylon we assigned the workplane to the river side boundary plates. In that 67-degree tilted plane we modeled the joints between construction segments and riverside plates in orthogonal system. These plates then served as basepoints for the complicated 3D modelling for the rest of the pylon. Given the complexity of the bridge there were numerous details left for modeling: Cable anchoring for both the main span and for the anchoring cables at the end of the girder, the joint connection and vicinity of the bearings, and the connection between the pylon and girder.

In conclusion using 3D software proved to have numerous advantages. From visualization, collision analysis, parametric element marking, to examine the contractibility. We except our model to be useful for accurate fabrication. For numerous years our company utilizes Tekal Structures in infrastructural projects, however the Mosoni-Duna bridge stands out both in complexity and uniqueness. For this reason, we decided to enter the BIM Awards competition.

Client: National Infrastructure Development Private Company Limited (Nif Zrt.)
Designer company: UNITEF’83 Zrt.
Designers: Róbert Bartus Office Director
Ákos Kővári: Lead Engineer
Richárd Berta: Structural Engineer (3D modeling – girder)
András Halwax: Structural Engineer (3D modeling – pylon)
Tailerling János: Structural Engineer (superstructure and substructure analysis)
Gábor Szepessy: Structural Engineer (superstructure and seismic analysis)
Gábor Németh: Structural Engineer (superstructure and aerodynamic analysis)
Márta Székely: Structural Engineer (Detail designer)
Viktória Simon: DLA Architect (architectural design)
Domonkos Tóth: Architect (visualization)