Experimental Study of Combined Size and Strain Rate Effects on the Fracture of Reinforced Concrete
Publication: Journal of Materials in Civil Engineering
Volume 20, Issue 8
Abstract
This paper presents very recent results of an experimental program aimed at disclosing size and strain rate effects on the fracture behavior of reinforced concrete beams. Thirty-six reinforced beams made from two microconcretes with different Hillerborg’s characteristic length [one is (material A), the other is (material B)], of three sizes (75, 150, and in depth), were tested under four strain rates ( , , , and ). The results show that the peak loads increase with an increase in the strain rate; the rate dependence of the peak load is stronger for larger specimens than for smaller ones. Moreover, size effect is only shown under the nominal strain rate ; under the higher strain rates, it is inconspicuous. These results seem to reveal an apparent physical inconsistency, since there is no obvious reason that the size effect disappears when the strain rate increases. The explanation to this is sought numerically using an explicit cohesive model.
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Acknowledgments
Funding from the Ministerio de Educación y Ciencia, Spain, under Grant Nos. UNSPECIFIEDMAT 2003-00843 and UNSPECIFIEDMAT 2006-09105, is gratefully acknowledged. The first writer acknowledges financial support from the fellowship UNSPECIFIED2005-BIN-748 given by the Universidad de Castilla-La Mancha, Spain. The writers also thank Jacinto R. Carmona for his help in the experiments.
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© 2008 ASCE.
History
Received: Feb 21, 2007
Accepted: Dec 10, 2007
Published online: Aug 1, 2008
Published in print: Aug 2008
Notes
Note. Associate Editor: Kolluru V. Subramanian
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