Cracking and Bond Resistance in High Strength Reinforced Concrete Beams, Illustrated by Photoelastic Coating

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Title: Cracking and Bond Resistance in High Strength Reinforced Concrete Beams, Illustrated by Photoelastic Coating

Author(s): Paul W. Abeles

Publication: Journal Proceedings

Volume: 63

Issue: 11

Appears on pages(s): 1265-1278

Keywords: beam, bond resistance, cracking, crack width, deflection, high strength concrete, high strength steel, microcracking, nontensioned steel, photoelastic coating photostress method, prestressing, reinforced concrete, research.

Date: 11/1/1966

Abstract:
The paper shows the application of photoelastic coating (also called photostress method) to a concrete beam, reinforced with two nontensioned prestressing strands, so as to illustrate micro and visible cracking. Deflections and crack widths at the tensile face and at the level of the steel are shown and photostress pictures are presented at varioous loadings, depicting the cracking during three loading cycles. The effect of an excellent bond between the steel and the high strength concrete is illustrated. A comparison is made with a concrete beam of the same dimensions but reinforced with four nontensioned prestressing wires, with which the bond conditions are quite good but not so excellent as with strands.