Shake table test of an isolated bridge with cable-sliding friction aseismic bearing

Abstract eng:
In seismic active region, bridges isolated by conventional sliding devices risk damages caused by large lateral displacement of superstructure. With shake table test, this study investigated the seismic behavior of a 6-pylon extradosed bridge isolated by sliding controlled bearings known as the cable-sliding friction aseismic bearing, or CSFAB. The test results indicated that this bearing system can restrain the girder-pier relative displacement effectively, while acceleration of the girder could increase momentarily as the lateral displacement was being restrained, which revealed that as the cable re-established the inertia force transfer path, bridge pier with CSFAB might face greater lateral force than that with conventional bearing. How to design the restraining capacity and relative issues were discussed.

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