Comparison between the short and long term behaviour of fibre reinforced and unreinforced concrete beams

Purkiss, J. A.; Blagojević, Predrag

doi:10.1016/0263-8223(93)90149-k

Cited by 9 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Electrical resistance strain gauges offer a simple, quick and relatively cheap method of strain measurement. The method has been used on numerous occasions in the past for obtaining strain measurements from conventional steel bar and steel fibre reinforced concrete specimens in flexure [21][22][23][24]. However, strain gauges only measure strain at the point of fixing and in the direction of the gauge alignment, and therefore they do not provide a full-field analysis.…”

mentioning

confidence: 99%

Flexural strain and crack width measurement of steel-fibre-reinforced concrete by optical grid and electrical gauge methods

Robins

Austin

Chandler

et al. 2001

Cement and Concrete Research

View full text Add to dashboard Cite

This item was submitted to Loughborough's Institutional Repository (https://dspace.lboro.ac.uk/) by the author and is made available under the following Creative Commons Licence conditions.For the full text of this licence, please go to: http://creativecommons.org/licenses/by-nc-nd/2.5/ FLEXURAL STRAIN AND CRACK WIDTH MEASUREMENT OF STEEL FIBRE REINFORCED CONCRETE BY OPTICAL GRID AND ELECTRICAL GAUGE METHODSPeter Robins, Simon Austin and Peter Jones, Department of Civil and Building Engineering Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK Keywords: crack detection (B), fibre reinforcement (E), fracture toughness (C), image analysis (B), modelling (E) Abstract: A research programme is discussed that has investigated the fracture of steel fibre reinforced sprayed concrete under flexural loading, with the aim of developing a stress-block model to predict flexural behaviour in the form of a load-deflection response. This paper reports the work associated with establishing the strain and crack-width profiles in relation to mid-span beam deflection. A strain analysis technique is described, which combines the use of electrical strain gauges with a semi-automated grid method (using digital image processing) for measuring and monitoring the strain and crack-width profile over the depth of a fibre reinforced beam during a flexural test.This novel strain analysis technique has established strain/crack-width data which forms a key part of a stress-block approach for predicting residual flexural strength, an essential requirement of a much needed design rationale for steel fibre reinforced concrete. Introduction Research ObjectivesThe work reported here formed part of a larger research project investigating the reinforcing mechanisms and fracture processes associated with steel fibre reinforced sprayed concrete under flexural load. A major aim of this project was to develop a model -based on conventional principles of mechanics -to predict flexural behaviour in the form of a load-deflection response, and thereby predict flexural toughness performance.The principal objective of this study was to test the following hypothesis: given the matrix compressive strength, fibre volume, fibre type, cross-section dimensions and loading geometry of a steel fibre reinforced sprayed concrete beam, the flexural loaddeflection curve can be predicted using a stress-block diagram approach, if the following principal parameter relationships are known: the uniaxial compressive stress-strain relationship; the uniaxial tensile stress-strain relationship; the single fibre pull-out load versus crack-width relationship; the number, distribution, embedment lengths and orientation of the fibres bridging the cracked section of the beam; and the strain profile and the crack-width profile in relation to mid-span beam deflection. This paper presents work carried out on the last principal parameter listed above, that is the strain and crack-width profiles, whilst that on fibre pullout and distribution are reported elsewhere [1, 2]. ...

show abstract

mentioning

confidence: 99%

Flexural strain and crack width measurement of steel-fibre-reinforced concrete by optical grid and electrical gauge methods

Robins

Austin

Chandler

et al. 2001

Cement and Concrete Research

View full text Add to dashboard Cite

show abstract

“…Brittle failure of concrete in tension can be avoided or delayed by adding randomly dispersed steel fibers to the concrete mixture. Experimental investigations conducted in the last few decades identified several advantages of steel fiber reinforced concrete (SFRC) over conventional reinforced concrete, such as higher tensile and shear strength, improved cyclic response, higher spalling resistance and improved post-cracking behavior [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Flexural Behavior of Steel Fiber Reinforced Concrete Beams: Probabilistic Numerical Modeling and Sensitivity Analysis

Blagojević

Kukaras

2021

Applied Sciences

View full text Add to dashboard Cite

One of the principle issues concerning the practical application of steel fiber reinforced concrete (SFRC) is the uncertainty related to its structural behavior, primarily caused by the partially random distribution and orientation of steel fibers in SFRC structural elements. This paper aims to provide a better understanding of how the variance of material properties of the SFRC affects the flexural behavior of SFRC beams. First, a distributed plasticity fiber finite element model of beam flexural behavior is proposed and validated. Then, probability distributions of selected material properties are defined based on existing probabilistic models and experimental results from the literature. Finally, a variance-based sensitivity analysis is performed using Sobol’ indices to identify uncertainties in material properties that contribute most to the uncertainties related to three characteristic points of a beam’s flexural behavior: first crack, yield, and collapse point. Sensitivity analysis is performed by surrogating the numerical model using polynomial chaos expansion. The variance in residual tensile strength is identified as the main contributor to the variance in the flexural behavior of an SFRC beam used in the case study.

show abstract

“…Although most of experimental programmes of structural elements (74%) were focused in FRC structural beams [121,125,131,136,141,149,115], experimental tests carried out on suspended slabs [143,148] slabs-on-grade [70], and FRC pipes [145][146][152][153] were also reported. Regarding creep tests on beams, a wide range of beam dimensions were reported from 1.2 to 4.0 m in length.…”

Section: Structural Elements Flexure Creep Testmentioning

confidence: 99%

Improvements in test methodology and characterisation of long-term flexure behaviour of fibre-reinforced concrete

Torre¹

View full text Add to dashboard Cite

show abstract

Comparison between the short and long term behaviour of fibre reinforced and unreinforced concrete beams

Cited by 9 publications

References 0 publications

Flexural strain and crack width measurement of steel-fibre-reinforced concrete by optical grid and electrical gauge methods

Flexural strain and crack width measurement of steel-fibre-reinforced concrete by optical grid and electrical gauge methods

Flexural Behavior of Steel Fiber Reinforced Concrete Beams: Probabilistic Numerical Modeling and Sensitivity Analysis

Improvements in test methodology and characterisation of long-term flexure behaviour of fibre-reinforced concrete

Contact Info

Product

Resources

About