Shear Capacity of Steel and Polymer Fibre Reinforced Concrete Beams

Research output: Contribution to journalJournal articleResearchpeer-review

3 Downloads (Pure)

Abstract

This paper deals with the application of a plasticity model for shear strength estimation of fibre reinforced concrete beams without stirrups. When using plastic theory to shear problems in structural concrete, the so-called effective strengths are introduced, usually determined by calibrating the plastic solutions with tests. This approach is, however, problematic when dealing with fibre reinforced concrete (FRC), as the effective strengths depend also on the type and the amount of fibres. In this paper, it is suggested that the effective tensile strength of FRC can be determined on the basis of the tensile stress-crack opening relationship found from wedge splitting tests. To determine the effective compressive strength of FRC, it is proposed to adopt the formula used for conventional concrete and modify it by introducing a fibre enhancement factor to describe the effect of fibres on the compressive softening behaviour of FRC. The enhancement factor is determined as the ratio of the areas below the stress–strain curves for FRC and for conventional concrete. The outlined approach has been verified by shear testing of beams containing no fibres, 0.5% steel fibre volume and 0.5% polymer fibre volume. The tests results are compared with estimations and show satisfactory agreements, indicating that the proposed approach can be used.
Original languageEnglish
JournalMaterials and Structures
Volume44
Issue number6
Pages (from-to)1079-1091
ISSN1359-5997
DOIs
Publication statusPublished - 2011

Keywords

  • Shear strength
  • Polymer fibre
  • Steel fibre
  • Plasticity model
  • Reinforced concrete beams

Cite this

@article{b823b1e286fd44a095a2c846bb02b08c,
title = "Shear Capacity of Steel and Polymer Fibre Reinforced Concrete Beams",
abstract = "This paper deals with the application of a plasticity model for shear strength estimation of fibre reinforced concrete beams without stirrups. When using plastic theory to shear problems in structural concrete, the so-called effective strengths are introduced, usually determined by calibrating the plastic solutions with tests. This approach is, however, problematic when dealing with fibre reinforced concrete (FRC), as the effective strengths depend also on the type and the amount of fibres. In this paper, it is suggested that the effective tensile strength of FRC can be determined on the basis of the tensile stress-crack opening relationship found from wedge splitting tests. To determine the effective compressive strength of FRC, it is proposed to adopt the formula used for conventional concrete and modify it by introducing a fibre enhancement factor to describe the effect of fibres on the compressive softening behaviour of FRC. The enhancement factor is determined as the ratio of the areas below the stress–strain curves for FRC and for conventional concrete. The outlined approach has been verified by shear testing of beams containing no fibres, 0.5{\%} steel fibre volume and 0.5{\%} polymer fibre volume. The tests results are compared with estimations and show satisfactory agreements, indicating that the proposed approach can be used.",
keywords = "Shear strength, Polymer fibre, Steel fibre, Plasticity model, Reinforced concrete beams",
author = "Kragh-Poulsen, {Jens C.} and Hoang, {Cao Linh} and Per Goltermann",
year = "2011",
doi = "10.1617/s11527-010-9685-6",
language = "English",
volume = "44",
pages = "1079--1091",
journal = "Materials and Structures",
issn = "1359-5997",
publisher = "Springer Netherlands",
number = "6",

}

Shear Capacity of Steel and Polymer Fibre Reinforced Concrete Beams. / Kragh-Poulsen, Jens C.; Hoang, Cao Linh; Goltermann, Per.

In: Materials and Structures, Vol. 44, No. 6, 2011, p. 1079-1091.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Shear Capacity of Steel and Polymer Fibre Reinforced Concrete Beams

AU - Kragh-Poulsen, Jens C.

AU - Hoang, Cao Linh

AU - Goltermann, Per

PY - 2011

Y1 - 2011

N2 - This paper deals with the application of a plasticity model for shear strength estimation of fibre reinforced concrete beams without stirrups. When using plastic theory to shear problems in structural concrete, the so-called effective strengths are introduced, usually determined by calibrating the plastic solutions with tests. This approach is, however, problematic when dealing with fibre reinforced concrete (FRC), as the effective strengths depend also on the type and the amount of fibres. In this paper, it is suggested that the effective tensile strength of FRC can be determined on the basis of the tensile stress-crack opening relationship found from wedge splitting tests. To determine the effective compressive strength of FRC, it is proposed to adopt the formula used for conventional concrete and modify it by introducing a fibre enhancement factor to describe the effect of fibres on the compressive softening behaviour of FRC. The enhancement factor is determined as the ratio of the areas below the stress–strain curves for FRC and for conventional concrete. The outlined approach has been verified by shear testing of beams containing no fibres, 0.5% steel fibre volume and 0.5% polymer fibre volume. The tests results are compared with estimations and show satisfactory agreements, indicating that the proposed approach can be used.

AB - This paper deals with the application of a plasticity model for shear strength estimation of fibre reinforced concrete beams without stirrups. When using plastic theory to shear problems in structural concrete, the so-called effective strengths are introduced, usually determined by calibrating the plastic solutions with tests. This approach is, however, problematic when dealing with fibre reinforced concrete (FRC), as the effective strengths depend also on the type and the amount of fibres. In this paper, it is suggested that the effective tensile strength of FRC can be determined on the basis of the tensile stress-crack opening relationship found from wedge splitting tests. To determine the effective compressive strength of FRC, it is proposed to adopt the formula used for conventional concrete and modify it by introducing a fibre enhancement factor to describe the effect of fibres on the compressive softening behaviour of FRC. The enhancement factor is determined as the ratio of the areas below the stress–strain curves for FRC and for conventional concrete. The outlined approach has been verified by shear testing of beams containing no fibres, 0.5% steel fibre volume and 0.5% polymer fibre volume. The tests results are compared with estimations and show satisfactory agreements, indicating that the proposed approach can be used.

KW - Shear strength

KW - Polymer fibre

KW - Steel fibre

KW - Plasticity model

KW - Reinforced concrete beams

U2 - 10.1617/s11527-010-9685-6

DO - 10.1617/s11527-010-9685-6

M3 - Journal article

VL - 44

SP - 1079

EP - 1091

JO - Materials and Structures

JF - Materials and Structures

SN - 1359-5997

IS - 6

ER -