Abstract
<p>Increasing the strength of steel rebar can improve load-bearing capacity of concrete structures and economize their cost. Precast segmental columns incorporated with high-strength rebar facilitate accelerating bridge construction and may upgrade their seismic performance. To evaluate the cyclic loading behaviors between precast circular pier columns with high-strength and conventional rebar, two column specimens with the energy dissipation bars of HRB600E and HRB400 were experimentally studied. The tests showed that seismic performance of the precast column with high-strength rebar was superior to the counterpart with conventional rebar in the aspects of equivalent yielding strength, maximum shear force, ultimate displacement, post- yielding drift increment, residual displacement, and stiffness degradation. On the other hand, precast column with conventional strength rebar dissipated more energy at the cost of substantial joint damage. Therefore, replacing conventional steel rebar with high-strength bar in precast columns can be a good and practical choice to enhance seismic resiliency of precast bridge columns.</p>
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