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Dagu Bridge

Tianjin, China

Market Sector

Bridge

Type

Arch

Services Provided

Design

Region

Asia Pacific

An iconic architectural landmark in Tianjin, the Dagu Bridge is located in Tianjin’s urban Consumer Recreation District (CRD), and crosses the Haihe River at the point where the river is about 100 meters wide.

A tied arch structure was selected for the 106 meter main span. Each arch rib has a three-dimensional structural system by having two planes of hangers. The bridge carries six lane traffic and two pedestrian paths, with a width that varies from 30 to 60.8 meters. In order to provide sufficient headroom for sightseeing boats to cruise the river, the maximum depth of the bridge girder is only 1.3 meters at the navigation opening.

The visually-striking asymmetrical design for the steel box tied arch Dagu Bridge is called “Sun and Moon Arches”. The larger, 39 meters high arch faces east and symbolizes the sun, while the smaller, 19 meter high arch faces west and symbolizes the moon. The larger and smaller arches also incline outwards by 18° and 22° respectively.

Project Highlights:

  • This important crossing is a striking and unusual signature bridge for Tianjin and its people.
  • The structure is the first of its kind worldwide, and represents a major achievement in bridge engineering.
  • The deck loadings are distributed to the inclining high/low arch ribs through the spatial tie rods. The spatial tie rods within the arches form multi-point supports to the cross-beams and meet the requirements for “Rigid Plate Bridges” of this size.
  • By fully exploiting the transverse rigidity of the cross-sections and the vertical rigidity of the arches, this slender-looking bridge has a high resistance to earthquakes in the Tianjin region.

Services Provided:

T.Y. Lin International and T.Y. Lin International China provided complete design services for this bridge project.

Awards
Honor Award, 2007
Consulting Engineers and Land Surveyors of California (CELSOC)
Eugene C. Figg Medal, 2006
International Bridge Conference (IBC)
Illumination Design Merit Award, 2006
Illuminating Engineering Society (IES)