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Frontal view of the bridge

Troja bridge, Czech Republic

The 200m Troja Bridge carries pedestrian and cycle traffic, four lanes of road traffic, and a double-tracked tram line. Working with Koucky Architects, we prepared the preliminary, tender and detailed design for the connection over the Vltava river in Prague.

Visualisation of road and tram bridge
Leading design
Leading design The bridges design consists of a network arch - similar to a bowstring arch.

The 34m wide bridge is made up of two stand-alone structures, separated by an expansion joint, on the Troja side of the river and forms part of the new Prague Ring Road transportation link.

Our design consists of a steel tied arch featuring a network arrangement of suspender rods. The prestressed concrete bridge deck is suspended from the arch using two inclined planes of network hangers, which connect the arch to the two composite steel-concrete arch ties. This hangar arrangement provides four times the stiffness of a comparable tied arch using vertical suspender rods.

The elegance of the bridge mainly results from both the ratio of the rise to the span of the arch, accounting for its slenderness of 1:10 and the 1:180 ratio of the overall height of the arch to its span. The dense network of hangers has made it possible to achieve these ratios by improving the strength and rigidity of the structure.

Troja Bridge represents a major step forward in structural efficiency. By reconfiguring the hangers of the bowstring arch from a conventional vertical arrangement to a diagonal one, we have dramatically improved the bridge’s performance.

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