Experimental study of potential bearing uplift of cable-stayed bridges under earthquakes

To investigate the potential bearing uplift of long-span cable-stayed bridges, a 1/35 scaled double- tower bridge model was tested on four shake tables at Tongji University, China. A longitudinal floating system was first applied to the test model, i.e., the unlimited longitudinal but restrained transverse movements. Then, viscous fluid dampers (VFDs) were installed as the tower-deck connections to study their effects on alleviating the issue of bearing uplift at auxiliary piers. Test results showed that: (1) though ground motions were merely longitudinally input, there was a possibility of bearing uplift due to the longitudinal vibration of the towers combined with the vertical vibration of the deck; (2) the effectiveness of the VFDs on reducing the bearing force at the auxiliary pier was related to the characteristics of earthquakes; (3) compared with the deck longitudinal displacement, the effectiveness of VFDs on controlling its vertical displacement was insignificant.

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