Design and Vibration Serviceability Evaluation of Pedestrian Space Arch Bridge

Wirye bridge with a width of 7.3m and an extension of 109m is a pedestrian space arch bridge crossing the highway of 70m width. Due to the on-site conditions of crossing a highway with high traffic volume, steel pipe girder and steel deck was installed by small-block erection method after erecting arch rib and vertical members with single lift installation method. It is possible to mount the steel pipe girder and the steel deck more easily by installing a cross beam in advance that connects the vertical members each other to reduce the deformation of the vertical member. And the cross beam can improve the structural safety of the buckling through the decrease of the unsupported length by the vertical member acting as both-end supported conditions instead of cantilever during construction period. As a result of the serviceability evaluation for deflection and vibration, it was presented that Wirye bridge satisfied with serviceability criteria for deflection and vibration. In addition, vibration comport evaluation according to ISO 2631-2 verified that the exposure time of fatigue-decreased proficiency boundary for vertical and horizontal directions was evaluated to be more than 24 hours, and that the human function due to vibration is not degraded within 24 hours on bridge.

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