Corrosion effect on compatibility between prestressing strand and concrete

摘要

This present study investigated effects of the strain compatibility between strands and concrete on the flexural behavior of corroded post-tensioned beams. First, eight post-tensioned beams with bonded strand were designed and subjected to accelerated corrosion to different strand corrosion degrees, and the load deflection response and the ultimate strength were discussed based on the flexural test. Next, a compatibility coefficient was introduced to quantify the inconsistent compatibility between corroded strand and concrete. The influence of strand corrosion on the compatibility coefficient was discussed. Finally, an analytical model was proposed to predict the ultimate strength of the post-tensioned beams with corroded strand. The model was verified with different experimental results.