Abstract
In general, to design a large span bridge, cable-supported bridges are utilized with high towers and stiffened by steel girder since it is flexible and lightweight. In addition, to increase the stiffening against aerodynamic stability, a hybrid cable-supported bridge which combines both suspension and cable-stayed structure has been proposed. However, the hybrid system inherently comes with higher towers in comparison to the conventional suspension system. Consequently, the angular change of the main cable at the tower saddle could be larger which causes increasing secondary stress in the main cable and the cable becomes more critical in fatigue.
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