Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 23, Issue 1, Pages 129-137Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2008.01.013
Keywords
Tensile test; Kinematic constrains; Concrete
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Experimental observations suggests that concrete specimens subjected to uniaxial tension may have different responses depending on the imposed kinematic constrains. A simple model is proposed here to explain the experimental findings. Concrete specimens are schematized as a system composed of three trusses. This model can thus consider the non-homogeneity of the material, and the eccentricity between the head of the testing machine and the specimen. Two kinds of tests are considered: imposed uniform displacement (fixed platens) and freely rotating platens. The results of the model show that the tests based on fixed platens provide higher peak loads. Only for a perfect specimen and testing conditions (homogeneous material and absence of geometric eccentricity) the results of a fixed platens test and of a rotating platens test coincide. Furthermore, the same results are obtained by energy balance. (C) 2008 Elsevier Ltd. All rights reserved.
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