Extradosed bridge is a bridge between continuous bridge and cable-stayed bridge in which part of load is supported by cable and other part of load is supported by girder.

　　There are some characteristics with extradosed bridge:

1.Low tower. Height of extradosed bridge is only half of height of cable-stayed bridge.

2.Strong girder. Girder of extradosed bridge is so strong to support vertical load of 70%.

3.Centralized cable. Generally, Cable spacing is concentrated arranged per 3 to 5 meters at center of side span or one third of near mid-span.

4.Small cable stress amplitude. Cable stress amplitude of extradosed bridge is only one third of which of cable-stayed bridge, and not more than 90MPa generally.

5.Low cost. Low tower can decrease fees of construction, small cable stress amplitude can reduce amount of cable.

　　As a beautiful and economical bridge, extradosed bridge is developed quickly in bridge industry at home and abroad. Based on many investigation and study, FASTEN has developed its own cable system of extradosed bridge and used in many bridges.