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Title: | Experimental investigation of cracking and deformations of concrete ties reinforced with multiple bars |
Authors: | Rimkus, Arvydas Gribniak, Viktor |
Keywords: | Reinforced concrete Multiple bars Tensile test Deformations Cracking |
Issue Date: | 2017 |
Publisher: | Elsevier |
Citation: | Rimkus, A., Gribniak, V., 2017. Experimental investigation of cracking and deformations of concrete ties reinforced with multiple bars. Construction and Building Materials. 148, 49-61 https://doi.org/10.1016/j.conbuildmat.2017.05.029 |
Series/Report no.: | 148; |
Abstract: | Interpretation of test results may be inadequate even for simple test layouts. On the one hand, conventional tests, that investigate a concrete prism reinforced with a single bar in the centre, do not allow to
account for the effect of variation of the diameter-to-reinforcement ratio (£/p). This important limitation
should be related to the use of simple specimens in constitutive modelling. On the other hand, a tie-test
typically provides measurements of average deformations of the internal reinforcing bar and the concrete
surface. The experimental evidence, however, often contradicts the general assumption of the equivalence of the mean strains of reinforcement and concrete. The strain difference is closely related to the
width of the concrete cover. This paper investigates the effect of distribution of bar reinforcement on
deformation and cracking behaviour of tensile elements. Special testing equipment has been developed
to investigate ties reinforced with multiple bars. The test program consists of 23 ties. The number and
diameter of the bars vary from 4 to 16 and from 5 mm to 14 mm, respectively. Two different covers
(30 mm and 50 mm) are considered as well. The deformation analysis is based on measurements of
the average reinforcement and concrete surface strains. The development of cracks was investigated
using digital image correlation (DIC). The Model Code 2010 and Eurocode 2 predictions are compared
with the experimental data. While the Design Codes predict that the maximum crack spacing is dependent on the £/p ratio, the test results indicate that the crack distances are actually much less dependent
on the reinforcement characteristics. |
URI: | http://dspace.vgtu.lt/handle/1/4216 |
ISSN: | 0950-0618 |
Appears in Collections: | Moksliniai straipsniai / Research articles
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