Abstract
An empirical calculation method is proposed in the article for the calculation of residual flexural tensile strength of steel fibre reinforced concrete. The method was developed analyzing factors which have an influence on residual tensile strength, and using the experimental results of 446 specimens. Assuming that the residual flexural tensile strength depends on three functions the relevant variables and constants were deduced, and so the optional functions were established. The proposed calculation method is suitable for the SFRC, where fibre content varies from 15 to 80 kg/m 3 as well as mean compressive strength varies from 25 to 60 MPa. Only circular cross-section hooked end steel fibre is available however, traditionally vibrated as well as self-compacting concrete is suitable for this method. The residual flexural tensile strength ( f R, 1 ) is used in various crack width calculation methods, and it should be determined experimentally according to standards. Therefore, the proposed calculation method has a great practical benefit. DOI: http://dx.doi.org/10.5755/j01.mech.21.4.9551
Highlights
Fibre reinforced concrete (FRC) is cement based composite material
Calculation of the residual flexural tensile strength is complicated due to the random distribution of the steel fibre in the concrete, due to a large variety of the fibre types, due to the different fibre bond and other aspects. It could be found in the literature some calculation proposals of steel fibre reinforced concrete (SFRC) post-cracking properties [1, 3, 15,16,17,18,19]
In order to calculate the residual flexural tensile strength fR,1 the main factors which has an influence on the post-cracking properties of SFRC should be established:
Summary
Fibre reinforced concrete (FRC) is cement based composite material. Basically, the concrete has a low tensile strength, low strain capacity, and it fails in brittle manner. There are two main reasons for these limitations: first – lack of the generally accepted design method, second – complicated (experimental) determination of the post-cracking properties of steel fibre reinforced concrete (SFRC). Calculation of the residual flexural tensile strength is complicated due to the random distribution of the steel fibre in the concrete, due to a large variety of the fibre types, due to the different fibre bond and other aspects Despite of that, it could be found in the literature some calculation proposals of SFRC post-cracking properties [1, 3, 15,16,17,18,19].
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