Strength, Ductility, and Prestress Losses of Unbonded Post-Tensioning Strands in Self-Centering Structures

Unbonded post-tensioning strands have been employed in numerous research studies for precast concrete bridge piers to provide restoring force under seismic loading. When designing these systems, premature fracture of strands due to stress concentrations at anchorages and post-tensioning losses should be considered. Previous studies on unbonded strands between post-tensioning anchorages under cyclic loading are limited to 12.7-mm and 15.2-mm …