Empirical calculation method of residual flexural tensile strength fR,1 of SFRC

  • Šarūnas Kelpša Kaunas University of Technology
  • Mindaugas Augonis Kaunas University of Technology
  • Mindaugas Daukšys Kaunas University of Technology
  • Algirdas Augonis Kaunas University of Technology
  • Giedrius Žirgulis Norwegian University of Science and Technology
Keywords: Steel fibre, SFRC, residual flexural tensile strength, CMOD

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/m3 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 (fR,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

Author Biographies

Šarūnas Kelpša, Kaunas University of Technology
PhD student
Mindaugas Augonis, Kaunas University of Technology
Head of Department of Building Structures
Mindaugas Daukšys, Kaunas University of Technology

Head of Department of Civil Engineering Technologies

Algirdas Augonis, Kaunas University of Technology
Department of Building Materials
Giedrius Žirgulis, Norwegian University of Science and Technology

Department of Structural Engineering

Published
2015-08-27
Section
MECHANICS OF SOLID BODIES