Shaking Table Tests of Post-Tensioned Rocking Bridge with Double-Column Bents

Abstract

Rocking piers can limit the seismic damage and residual displacement under strong earthquakes to maintain the post-earthquake serviceability of bridges. This article presents an experimental study on the seismic response and rocking isolation of a bridge with post-tensioned rocking piers exhibiting negative rocking stiffness. A 1/10 scaled single-span bridge was precast and tested on a shaking table. The experimental results show that appropriately designed unbonded tendons can enhance the seismic stability of rocking bridges without serious loss of isolation efficiency. The bridge model presented excellent post-earthquake resilience with negligible residual displacement and damage due to enhanced rocking interfaces. In addition, a larger section depth of the columns rendered ample stability but weaker isolation efficiency.