DAMAGE CONTROL AND EVALUATION OF PRECAST CONCRETE BEAMS POST-TENSIONED BY UNBONDED TENDONS AT WIDENED BEAM END

In this study, damage control for precast concrete beams post-tensioned by unbonded tendons at widened beam ends were investigated through loading tests and numerical analysis. The use of steel-fiber reinforced concrete reduced the damage during post-tensioning. The use of indented PC steel strands suppressed damage at drift angles of more than 3%. Based on the experimental results, the limit state was judged, and it was found that most of the limit states were determined by the concrete. The numerical analysis model using the fiber model could trace the hysteretic loop and the drift angle at limit state with good accuracy.