The Effect of Steel Fibers on the Moment Redistribution and Rotation Capacity of Post-Tensioned High-Strength Concrete Beams

摘要

Partial prestressing, unbonded tendons and high-strength concrete have become commonly used techniques and materials in the prestressed concrete industry. The effect of their application on the non-linear behaviour of continuous post-tensioned beams was studied in an experimental program at the Magnel Laboratory for Concrete Research of Ghent University. It was found that post-tensioned continuous concrete beams with higher strength concrete had limited moment redistribution and rotation capacity. In a further study it was investigated whether this effect can possibly be modified by the addition of regular steel fibres and micro steel fibres in high-strength concrete. The effect of regular steel fibres seemed rather limited. The addition of micro steel fibres improved the rotation capacity of high strength concrete beams.