The Yongjong Bridge is located at the west coast of Korea and is the part of Inchon International Airport Expressway that is constructed to connect the new international airport at Yong Jong Island, Inchon, and Seoul. The bridge is 4.4 km long and composed of three different bridge types: a suspension bridge (L=550m), a truss bridge (L=2250m) and a steel box bridge. The Bridge has double decks and carries 6 highway lanes on the upper deck and 4 highway lanes on the lower deck. Later, dual tracks of a railway will be added on the lower deck. The main feature of the Bridge is the three-span continuous self-anchored suspension bridge. The 550m long suspension bridge has the main span of 300 m and the side spans of 125m. The sag of the main span cable is 60 m so that the sag ratio of the cable is 1/5. The main cables of the suspension bridge take a spatial, 3 dimensional shape, that is, the main cable planes are inclined in the bridge-transverse axis. In the plan view, the distance between the main cables is changing along the bridge axis. The distance is shortest at the pylon saddles and is longest at the center of the main span and the anchorage. When compared to the typical two-dimensional suspension bridge, the suspension bridge with the spatial cable system has strong lateral stiffness but causes cable erection problem.
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