Abstract
It is unquestionable the fact that a structural system should be able to fulfil the function for which it was created, without being damaged to an extent disproportionate to the cause of damage. In addition, it is an undeniable fact that in reinforced concrete structures under severe dynamic loadings, both concrete and reinforcing bars are subjected to high strain-rates. Although the behavior of the reinforcing steel under high strain rates is of capital importance in the structural assessment under the abovementioned conditions, only the behaviour of concrete has been widely studied. Due to this lack of data on the reinforcing steel under high strain rates, an experimental program on rebar reinforcing steels under high strain rates in tension is running at the DynaMat Laboratory. In this paper a comparison of the behaviour in a wide range of strain-rates of several types of reinforcing steel in tension is presented. Three reinforcing steels, commonly proposed by the European Standards, are compared: B500A, B500B and B500C. Lastly, an evaluation of the most common constitutive laws is performed.
Highlights
Failure in engineering is understandably considered a negative occurrence, something that should be avoided at almost any cost
While for the B500C steel [17], considered as a composite bar made of a hardened outer cortical layer, an intermediate hardened layer and a soft inner core, the effects of the strain rate on the tensile properties of these three layers were evaluated on specimens coming from a bar having 40 mm in diameter
In case of B500C the represented data showed in Figs. 6–8 were obtained by means of the weighted strength
Summary
Failure in engineering is understandably considered a negative occurrence, something that should be avoided at almost any cost. The structural design should avoid that the presence of a human error or in case of deliberate act of terrorism can be the cause of a catastrophic collapse For these reasons, in a safe design is of extreme importance to consider all the possible loadings that could lead to failures, which could be caused by dynamic loads due to natural causes, like strong earthquakes, or accidentally caused by impacts or blasts. While for the B500C steel [17], considered as a composite bar made of a hardened outer cortical layer, an intermediate hardened layer and a soft inner core, the effects of the strain rate on the tensile properties of these three layers were evaluated on specimens coming from a bar having 40 mm in diameter. An evaluation of the most common constitutive laws, such as Johnson-Cook [18] and Cowper and Symonds [19] relationships, were performed
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