Static and Fatigue of High-Ductility Bars Reinforced Concrete Beams
Publication: Journal of Materials in Civil Engineering
Volume 11, Issue 1
Abstract
Steel ribbed bars with low carbon content and higher ductility, having different chemical composition and mechanical properties, and produced by a different manufacturing technique called the tempcore process, were used to reinforce concrete. The bar exhibited necking down and cup and cone failure in tension test at ultimate load, similar to those observed in the case of mild steel plain bars. Eight concrete beams reinforced with such bars were fabricated and tested under monotonic loading to study the flexural behavior of the beams. Tested beams exhibited large deflection as well as support rotation to such an extent that one of the bars in a tested beam displayed necking down at ultimate load. Fatigue tests on concrete beams reinforced with high-ductility bars were conducted in a systematic manner, by designing the beams on a rational basis for two million load cycles and testing the same using a computer-controlled, servo-hydraulic, closed-loop testing system. An innovative and low-cost measuring technique was adopted to measure the deflection and crack width under running condition of the test. Fatigue tests have disclosed for the first time that the mode of loading also influences the fatigue behavior of beams. This paper presents a complete description of the experimental investigations carried out under both static and cyclic loadings. Observations made on the fatigue life, midspan deflections, and crack width, under both static monotonic and cyclic loadings, are also included. In the case of the fatigue test, percentage increase in deflection, crack width, and curvature over the initial values, due to the type of loading, are also discussed in the paper.
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Published In
Journal of Materials in Civil Engineering
Volume 11 • Issue 1 • February 1999
Pages: 41 - 50
History
Published online: Feb 1, 1999
Published in print: Feb 1999
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