Confinement Reinforcement Requirement for Prestressed Concrete Piles in High Seismic Regions

Abstract eng:
Prestressed concrete piles used in high seismic regions are required to be designed with spiral reinforcement in the potential plastic hinge regions for confinement purposes. However, the design requirements available in the current codes and standards for quantifying this reinforcement are not consistent, nor do they allow the designer to account for the expected maximum curvature ductility of the pile section. In recognition of these challenges, a rational approach to designing confinement reinforcement in potential plastic hinge regions was investigated and an equation to quantify the minimum spiral reinforcement required for prestressed concrete piles in seismic regions was developed. The spiral reinforcement quantified according to this equation leads to a minimum curvature ductility capacity of about 18, while it is shown that the resulting ultimate curvature capacity of a typical pile section would be about 28% above an estimated target curvature for seismic regions around the world. By analyzing different prestressed pile sections with variables such as concrete strength, initial prestressing and axial load ratio, it is shown that the developed equation is adequate for quantifying the confinement reinforcement in prestressed concrete piles in high seismic regions.

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