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Van Troi - Tran Thi Ly Bridge

An award-winning and unique cable-stayed bridge becomes a landmark and reduces traffic congestion in Da Nang city.

The Tran Thi Ly bridge is a concrete cable-stayed bridge with an overall length of 731 metres, a width of 34.5 metres, and a main span that is 230 metres long. Its single inclined tower is 145 metres high and cables fan out on either side. The bridge has six lanes for traffic plus pedestrian sidewalks on both sides. The bridge spans the Han River in the center of the city of Da Nang in an east-west direction. Passenger and goods transport is now improved between the Han River’s west coast and the east coast’s tourist area, connecting Da Nang city with the Dien Nam-Dien Ngoc industrial zone in the Quang Nam province.

The bridge construction started in April 2009, and was officially opened to traffic on 29 March 2013.

Van Troi Thi Ly Bridge by night

PROJECT CHALLENGES

One of the project targets was to provide a new link from the inner city to the port of Da Nang. The client also wanted a landmark bridge which would attract visitors to the area.

The unusual bridge design, particularly the single inclining tower with cable arrangements, presented a number of technical challenges. 

APPROACH

A cable-stayed bridge design was chosen for this project. The inclined tower and the cables give it a unique design. We would usually have specified steel or composite structures for the main span of a bridge of this kind, but as concrete is a more widely used material in Vietnam, the team adapted the design to accommodate a concrete structure.

Due to the weight of tower and the weight of superstructure, the bearings under the tower are among the biggest spherical bridge bearings ever fabricated.

The western abutment is designed as a ballast load for the heavy 230 metre-long main span. 

Van Troi Thi Ly Bridge by day

OUTCOME

Da Nang city now has a landmark as well as a new bridge connection over the river. The Tran Thi Ly Bridge, the fifth bridge built over the Han River, reduces traffic congestion in Da Nang; advances Da Nang's position as a core city of the country’s central and highlands region; and, as a “must-see” feature, helps to boost the city’s tourism. 

SERVICES PROVIDED

  • General design
  • Engineering and detailed design
  • Copyright supervision

Bridge side view

TECHNICAL DETAILS

The structure is a 731 metre-long cable-stayed bridge with a main span of 230 metres. The single tower of the bridge is situated in the centre line of the bridge and has a backward-inclination of 12 degrees. The top of the tower is 145 metres above the mean water level. The structure carries six lanes for traffic and sidewalks on both sides for pedestrians.

The bridge has two sections, the approach viaduct and the cable-stayed bridge. Expansion joints are located at the end of the main span and at the eastern abutment. The main cable-stayed bridge is rigidly fixed to the western abutment, which acts as a counter weight for the main span. The pier under the tower has special spherical bearings to carry a very high vertical load.

The bridge has typical large (1.5 metres) diameter bored piles with lengths up to 50 metres. The back span cables are anchored to the abutment so that the uppermost cable in the tower is the closest one to the bridge deck and the lowest cable is the outermost. This arrangement is logical because the strongest cable is then the smallest and closest to the bridge deck.  The anchorages at the abutment are active anchorages.

The inclined tower is a structure of massive concrete.  The cables penetrate the tower, giving the simplest force transfer from main span cables to back span cables and to the tower. The outlook of the bridge superstructure is similar for both the approach span and the cable-stayed bridge. In the approach bridge, the superstructure comprises two triangular boxes and in the main span there is a wide box with diagonal trusses in a transverse direction and a longitudinal web in the middle where the cable anchorages are fixed.