Title:
Comparative Study of Prestressed Concrete Beams, With and Without Bond
Author(s):
Alan H. Mattock, Jun Yamazaki, and Basil T. Kattula
Publication:
Journal Proceedings
Volume:
68
Issue:
2
Appears on pages(s):
116-125
Keywords:
beams (supports);bond (concrete to reinforcement);continious beams;crack width and spacing;deflection;moments;post-tensioning;prestressed concrete;reinforced concrete;research;serviceablity;strength;T-beams; unbonded prestressing.
DOI:
10.14359/11298
Date:
2/1/1971
Abstract:
Tests were made of seven simple span beams of 28-ft span, and of three beams continious over two spans of 28 ft each. The primary variables were, the presence or absence of bond; the amount of bonded unprestresses reinforcement; and the use of seven wire strand as unbonded prestressed reinforcement. The unbonded post-tensioned beams with minimum reccomended unprestressed bonded reinforcement had serviceablity chasrateristics, strength, and ductility equal to, or better than, those of compareable bonded post-tensioned beams. An expression is proposed for the ultimate stress in unbonded tedons. Seven wire strand can be used effectively as unprestressed bonded reinforcement.