Effect of the concrete compressive strength and tensile reinforcement ratio on the flexural behavior of fibrous concrete beams

Ashour, Samir A.; Wafa, Faisal F.; Kamal, Mohmd I

doi:10.1016/s0141-0296(99)00052-8

Cited by 79 publications

(50 citation statements)

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“…Members with ductility ratio in the range of 3 to 5 have adequate ductility and can be considered for structural members subjected to large displacements, such as sudden forces caused by earthquake (39). The OPSC beams produced ductility ratio μ of 11.4 and this showed that OPSC is a ductile material attributed to its low modulus of elasticity.…”

Section: Flexural Behaviours Of Reinforced Concrete Beamsmentioning

confidence: 97%

High strength oil palm shell concrete beams reinforced with steel fibres

Yap

Alengaram

et al. 2017

Mater. construcc.

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ABSTRACT:The utilization of lightweight oil palm shell to produce high strength lightweight sustainable material has led many researchers towards its commercialization as structural concrete. However, the low tensile strength of Oil Palm Shell Concrete (OPSC) has hindered its development. This study aims to enhance the mechanical properties and flexural behaviours of OPSC by the addition of steel fibres of up to 3% by volume, to produce oil palm shell fibre-reinforced concrete (OPSFRC). The experimental results showed that the steel fibres significantly enhanced the mechanical properties of OPSFRC. The highest compressive strength, splitting tensile and flexural strengths of 55, 11.0 and 18.5 MPa, respectively, were achieved in the OPSFRC mix reinforced with 3% steel fibres. In addition, the flexural beam testing on OPSFRC beams with 3% steel fibres showed that the steel fibre reinforcement up to 3% produced notable increments in the moment capacity and crack resistance of OPSFRC beams, but accompanied by reduction in the ductility. RESUMEN: Vigas de hormigón de alta resistencia con palma de aceite reforzados con fibras de acero. La utilización de cáscara ligera de palma de aceite para producir materiales duraderos y de alta resistencia ha llevado a muchos investigadores a su comercialización como hormigón estructural. Sin embargo, la baja resistencia a la tracción del hormigón de cáscara de palma de aceite (OPSC) ha obstaculizado su desarrollo. Este estudio tiene como objetivo mejorar las propiedades mecánicas y los comportamientos de flexión de OPSC mediante la adición de fibras de acero de hasta un 3% en volumen, para producir hormigón armado de fibra de palma de aceite (OPSFRC). Los resultados experimentales mostraron que las fibras de acero mejoraron significativamente las propiedades mecánicas de OPSFRC. En la mezcla OPSFRC reforzada con fibras de acero al 3% se obtuvieron las mayores resistencias a la compresión, resistencia a la tracción ya la flexión de 55, 11,0 y 18,5 MPa, respectivamente. Además, el ensayo de vigas flexibles en haces OPSFRC con fibras de acero al 3% mostró que el refuerzo de fibra de acero hasta 3% produjo incrementos notables en la capacidad momentánea y resistencia a la fisuración de los haces OPSFRC, pero acompañado de una reducción de la ductilidad.PALABRAS CLAVE: Árido; Hormigón; Refuerzo de fibras; Resistencia a la flexión; Propiedades mecánicas ORCID ID: S. Poh-Yap

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Section: Flexural Behaviours Of Reinforced Concrete Beamsmentioning

confidence: 97%

High strength oil palm shell concrete beams reinforced with steel fibres

Yap

Alengaram

et al. 2017

Mater. construcc.

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“…The value of I exp is assumed to approach I cr(exp) when the applied moment approaches M y , which is a realistic assumption [15] . The calculation of deflection during the service stage of structure depends mainly on the cracked moment of inertia, I cr .…”

Section: Cracked Moment Of Inertiamentioning

confidence: 99%

The Serviceability Considerations of HSC Heavily Steel Reinforced Members under Bending

Maghsoudi¹,

Sharifi²

2008

American J. of Applied Sciences

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Abstract:To investigate the serviceability conditions of High Strength Concrete (HSC) beams, the total number of 6 beams (L = 2 m, b = 0.2 m, h = 0.3 m) heavily reinforced with different ratios of ρ and ρ′ were cast and tested under bending load. During the test the concrete and steel strains, deflection and crack width are measured at different beam locations. Based on these experimental readings, the bending rigidities (EI) of HSC beams are defined and the results are compared with the different available theoretical methods.

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“…This example compares experimental results from [23] and numerical results obtained using the developed formulation. The tested beams are reinforced by long and short fibers.…”

Section: Reinforced Concrete Beam (Enhanced Short Fibers)mentioning

confidence: 99%

“…A perfect plasticity behaviour is adopted for this material. Hooked-ends mild carbon steel fibers (short) with average length of 60 mm and nominal diameter of 0.8 mm are employed in the experimental specimen [23]. A perfect plasticity behaviour is adopted for the concrete and a small softening is adopted for fibers.…”

Section: Imposed Displacement Of 10 MMmentioning

confidence: 99%

A simple way to introduce fibers into FEM models

Vanalli

Paccola

Coda

2007

Commun. Numer. Meth. Engng.

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SUMMARYThis communication proposes a simple way to introduce fibers into finite element modelling. This is a promising formulation to deal with fiber-reinforced composites by the finite element method (FEM), as it allows the consideration of short or long fibers placed arbitrarily inside a continuum domain (matrix). The most important feature of the formulation is that no additional degree of freedom is introduced into the pre-existent finite element numerical system to consider any distribution of fiber inclusions. In other words, the size of the system of equations used to solve a non-reinforced medium is the same as the one used to solve the reinforced counterpart. Another important characteristic is the reduced work required by the user to introduce fibers, avoiding 'rebar' elements, node-by-node geometrical definitions or even complex mesh generation. An additional characteristic of the technique is the possibility of representing unbounded stresses at the end of fibers using a finite number of degrees of freedom. Further studies are required for non-linear applications in which localization may occur. Along the text the linear formulation is presented and the bounded connection between fibers and continuum is considered. Four examples are presented, including non-linear analysis, to validate and show the capabilities of the formulation.

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Effect of the concrete compressive strength and tensile reinforcement ratio on the flexural behavior of fibrous concrete beams

Cited by 79 publications

References 1 publication

High strength oil palm shell concrete beams reinforced with steel fibres

High strength oil palm shell concrete beams reinforced with steel fibres

The Serviceability Considerations of HSC Heavily Steel Reinforced Members under Bending

A simple way to introduce fibers into FEM models

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