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The Sutong Bridge crosses the Yangtze River upstream from Shanghai and will, when opened, carry a six-lane highway with emergency lanes. The total length of the bridge is 6 km. The main bridge is a cable-stayed bridge with a world record-breaking 1088 metre main span.
A concrete bridge with a main span of 268 metres provides a secondary navigation span. The approach bridges have spans varying between 42 metres and 75 metres.
The cable-stayed bridge has two inverted Y concrete towers over 300 metres high. The superstructure is a closed steel box girder with an overall width of 40 metres and a height of 4 metres.The towers and the side span piers are supported on cast in-situ bored piles more than 100 metres long and with a diameter of 2.8 metres. Each pylon is supported by 131 of these piles.
COWI's scope of services includes design assistance to the Chinese designer of the bridge and a review of the detailed design. As part of the design review of the bridge a global analysis model was established using COWI's in-house developed program IBDAS. The review of the foundations involved advanced soil-structure interaction analyses using a combination of pile group programs and IBDAS.
Due to strong currents in the Yangtze River significant scour is expected around the foundations. It was consequently decided to establish scour protection around the pylons. COWI prepared the basic design for the protection, specified the model tests to be carried out, reviewed the final design and provided consultancy on the construction of the scour protection.
COWI was furthermore responsible for carrying out some of the wind tunnel tests for the bridge and for reviewing the large number of wind tunnel tests and aerodynamic analyses performed by the Chinese designer and their sub-consultants. Aerodynamic analyses were carried out using the computer program DVMFLOW.
During the entire construction period COWI supported the client's construction management organisation. COWI also provided assistance and training in project management, quality assurance, operation and maintenance and carried out a review of the design of temporary works.
Design assistance and design review Design of scour protection Aerodynamic investigations Construction management
Jiangsu Province Sutong Bridge Construction Commanding Department