The study of the behavior of prestressed concrete beams subject to flexure
was initiated at the University of Illinois in 1951. So far, three phases of
this investigation have been reported. Billet (1) * bas presented a comprehensive
study of the behavior of post-tensioned bonded beams. Both Feldman (2) and Allen
(3) have studied post-tensioned unbonded beams. The tests reported herein, together
with the related analyses, are intended to add further to the knowledge of
the behavior of prestressed concrete beams.