Shaking Table Test of a Bridgewith Cablesliding Isolation Bearing

Abstract:

A halfstructure shaking table test based on Nanchang Chaoyang Bridge was designed and a detailed introduction of the designing process was performed. Two types of isolated system, i.e., cablesliding bearing system and friction bearing system, were introduced and applied to the structure according to whether or not cablesliding bearings were used. Two sets of seismic wave including the Nanchang artificial wave and El Centro seismic wave were induced as seismic loads during the test. The peak seismic responses of each key node of the structure were analyzed, so were the principle of how the cables could restrict the relative displacement between girder and piers. The results show that, under the seismic load, when the relative displacement response between girder and pier is small, cablesliding bearings have similar isolation features with ordinary sliding bearings. When the relative displacement is large, the cables can provide a momentary acceleration to the girder which can help limit the relative displacement and restrict it from increasing.