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Tensile behaviour of FRC under high strain-rate

Cadoni, Ezio ; Meda, Alberto ; Plizzari, Giovanni

In: Materials and Structures, 2009, vol. 42, no. 9, p. 1283-1294

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    Title
    • Tensile behaviour of FRC under high strain-rate
    Author
    • Cadoni, Ezio. Department of Environment, Constructions and Design, University of Applied Sciences of Southern Switzerland, Lugano, Switzerland
    • Meda, Alberto. Department of Engineering Design and Technologies, University of Bergamo, Bergamo, Italy
    • Plizzari, Giovanni. Department of Civil Engineering, Architecture, Land and Environment, University of Brescia, Brescia, Italy
    Document Type
    • Postprint
    OAI-PMH Identifier
    • oai:doc.rero.ch:316880
    Summary
    This paper presents experimental results on two types of concrete reinforced with steel and polyvinyl-alcohol (PVA) fibres subjected to dynamic tensile loading. The tests were carried out by using a Modified Hopkinson Bar apparatus on fibre reinforced concrete notched-specimens under three different strain-rates (50, 100, and 200s−1). From the experiments it was found that there is a significant enhancement in tensile strength with increasing strain-rates. The dynamic tests on steel FRC with the smaller loading rate (50s−1) showed a strength similar to the one measured from static tests; however, for increasing loading rates, a remarkable decrease of post-peak strength and ductility occurs. In specimens with PVA fibres, an enhancement of the tensile strength was also observed and a significant reduction of fracture energy and ultimate deformation occurred. Some experimental aspects are also discussed as the specimen shape, its dimension, the loading rate as well as the different post-peak behaviour from static and dynamic tests