ABSTRACT

Hanjiatuo Yangtze River Bridge is a railway steel truss girder cable-stayed bridge with span arrangement of (81+135+432+135+81) m. As a double track railway bridge for mixed passenger and freight traffic, it is the largest bridge in the world with less weight relatively and it is easily affected by dynamic effects. In this paper, firstly, the restraint system between the pylons and girder is studied under the consideration of braking force and seismic response. For this long span structure, a control system consisting of a novel velocity based locking device with self-control panel and a viscous damper is presented to control the braking force-induced vibration and seismic response respectively. Then, a scaled steel truss girder section model is tested in the wind tunnel laboratory, with additional dynamic loads acting on the bridge including dynamic interactions from the vehicles. The vortex-induced vibration under low wind speed is discovered in the test, for which a segmented deflector is creatively proposed to suppress the vibration.