Improving seismic performance of segmental precast post-tensioned bridge piers

Segmental precast post-tensioned bridge piers are one of the latest options for accelerated bridge construction. However, their application in seismic zones is limited due to the low energy dissipation observed in such piers and a lack of research. This paper reports on the construction and testing of a half-scale model pier equipped with an innovative external energy dissipation device. A combination of lead and steel plates were used in the segment joints to improve energy dissipation. The hysteresis behaviour, dissipated energy, effective stiffness and equivalent viscous damping for several consecutive cycles of loading were obtained. Furthermore, the hysteresis behaviour of the pier was modelled using numerical methods. The energy dissipation device was found to increase the energy dissipation capability of the pier by up to 30% at high drifts (more than 3%) while reducing damage criteria and residual displacement at the end of the test.