Comparative Study of Prestressed Concrete Beams, With and Without Bond


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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.

Date: 2/1/1971

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.