Shear Strength of Strain-Hardening Cementitious Materials

Author:

Georgiou Antroula1ORCID,Eshghi Najmeh2,Pantazopoulou Stavroula2ORCID

Affiliation:

1. Department of Civil and Environmental Engineering, University of Cyprus, 1678 Nicosia, Cyprus

2. Department of Civil Engineering, York University, Toronto, ON M3J 1P3, Canada

Abstract

Concrete and other semi-brittle materials are pressure sensitive. Their resistance to shear depends on the confining pressure acting normal to the shear plane. This behaviour is modelled using experimentally calibrated failure criteria, such as the Mohr–Coulomb failure surface. Pressure sensitivity is also strongly evident in fibre-reinforced, strain-hardening cementitious composites (SHCC), despite the internal confinement these materials possess on account of their fibre content. However, because of the great range and variety of mixes used in such materials, no general failure criteria have yet been proposed. In this paper, the pressure-sensitive shear strength of SHCC containing short discontinuous PVA fibres is modelled with a three-parameter failure criterion. The parameters of the criterion are calibrated to the experimental results obtained from several tests that combine shear and normal pressure. These include uniaxial tension and compression, split tests, triaxial compression, and a series of push-off tests with and without reinforcement crossing the shear sliding plane. The calibration of the failure criterion explicitly accounted for the magnitude of internal confinement which is generated in the cementitious matrix in response to fibre tension. The criterion is appropriate for general purpose analysis of the stress state of SHCC, but most importantly it is used to assess the SHCC contribution to the shear strength of structural elements.

Publisher

MDPI AG

Subject

General Engineering

Reference39 articles.

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4. (2016). French Standard (AFNOR): National Addition to Eurocode 2, Design of Concrete Structures: Specific Rules for Ultra-High Performance FRC (Standard No. NF P 18-710).

5. CSA International (2020). Canadian Highway Bridge Design Code, Section 16: Fibre-Reinforced Structures, Annex 8, CSA International.

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