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Design-oriented approach to determine FRC constitutive law parameters considering the size effect

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journal contribution
posted on 20.04.2020, 09:20 by Eduardo Galeote, Ana Blanco-Alvarez, Albert de la Fuente
© 2020 Elsevier Ltd Tensile strength constitutive laws for fibre reinforced concrete (FRC) are commonly defined through the parameters of flexural tests conducted on standard prismatic specimens. However, there are no specific criteria to determine such parameters using small specimens that could simplify the testing procedure and provide more representative results of slender structural FRC elements. In this line, the influence of size effect becomes an issue particularly relevant during the characterisation stage given that the residual strength decreases while increasing the size of the element. The objective of this document is to propose a methodology to obtain the parameters of the constitutive law using small specimens. For this, FRC residual strength was determined through three-point bending tests on prismatic notched beams of 40 × 40 × 160, 100 × 100 × 400 and 150 × 150 × 600 mm. An analytical model based on sectional analyses aimed at reproducing the flexural strength of FRC was used to assess the results of the alternative methodology to determine the parameters for the constitutive law. The results show that an approach based on the rotation instead of the crack opening as the reference parameter to estimate the stresses for the constitutive law leads to results less influenced by the size effect when designing small elements.

Funding

Spanish Ministry of Science, Innovation and Universities for the FPU13/04864 grant

Spanish Ministry of Economy, Industry and Competitiveness for the financial support through the SAES project (BIA2016-78742-C2-1-R)

History

School

  • Architecture, Building and Civil Engineering

Published in

Composite Structures

Volume

239

Publisher

Elsevier BV

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Composite Structures and the definitive published version is available at https://doi.org/10.1016/j.compstruct.2020.112036

Acceptance date

03/02/2020

Publication date

2020-02-04

Copyright date

2020

ISSN

0263-8223

eISSN

1879-1085

Language

en

Depositor

Dr Ana Blanco Alvarez. Deposit date: 9 April 2020

Article number

112036