Analytical solutions for flexural design of hybrid steel fiber reinforced concrete beams

Mobasher, Barzin; Yao, Yiming; Soranakom, Chote

doi:10.1016/j.engstruct.2015.06.006

Cited by 75 publications

(60 citation statements)

References 37 publications

(41 reference statements)

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“…It is also noted that the load-deflection responses exhibit a plateau stage while approaching the maximum ductility, which is due to the yielding of tensile steel. This has also been captured by the authors' previous analytical work (Mobasher et al 2015). In present study, the steel yielding stage is simply represented by a constant moment value.…”

Section: Experimental Verification Of the Analytical Modelmentioning

confidence: 93%

“…The neutral axis parameter k is found by solving the equilibrium of net internal forces and the nominal moment capacity Mn is obtained by taking the first moment of force about the neutral axis. Closed-form equations of moment and curvature at different stages for FRC and HRC sections can be found in (Soranakom and Mobasher 2008;Mobasher et al 2015). Figure 3 shows an example of the normalized moment-curvature and linearized portions for deflection-hardening material which can be exhibited by UHPC.…”

Section: Closed-form Moment-curvature Relationshipmentioning

confidence: 99%

“…The comparison is illustrated in Figure 7c where the model parameters are indicated. According to the parametric studies conducted by Mobasher et al (2015), the normalized moment capacity dramatically increased from 6.3 to 13.1 as the reinforcement ratio increased from 0.01 to 0.03. The improvement due to addition of fibers was marginal compared to longitudinal rebars.…”

Section: Experimental Verification Of the Analytical Modelmentioning

confidence: 99%

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Flexural Design Procedures for UHPC Beams and Slabs

Mobasher

Wang

Yao

2016

First International Interactive Symposium on UHPC

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Abstract:Analytical solutions are developed for deflection calculations of determinate beams subjected to usual loading patterns. The solutions are based on a bilinear moment curvature response characterized by the flexural crack initiation and ultimate capacity based on a deflection hardening behavior. Equations for deflection distribution along the full length of a beam are presented for multiple cases including three-and four-point bending, which can be further extended to uniform load, concentrated moment, and cantilever beams. The proposed equations are capable of tracking the curvature, angle of rotation and deflection at any point along the beam as serviceability based design approach. A parametric study is conducted to examine the effects of moment and curvature at the ultimate stage to moment and curvature at the first crack ratios on the deflection. Results are examined for UHPC beams with different reinforcement types and test configurations. The accuracy of the present model is successfully verified.

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Section: Experimental Verification Of the Analytical Modelmentioning

confidence: 93%

Section: Closed-form Moment-curvature Relationshipmentioning

confidence: 99%

Section: Experimental Verification Of the Analytical Modelmentioning

confidence: 99%

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Flexural Design Procedures for UHPC Beams and Slabs

Mobasher

Wang

Yao

2016

First International Interactive Symposium on UHPC

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“…The variable fiber content (Cf) in SFRC beams was evaluated at 0.5% (≈40 kg/m 3 ), 0.8% (≈60 kg/m 3 ) and 1.0% (≈80 kg/m 3 ). The influence of the amount on the beams´ shearing behavior could be analyzed because of this interval, once according to Mobasher et al (2015), interval 0.5% < Cf < 1.0% was sufficient to provide high ductility to concrete. The screwed hooked-end steel fiber (3D Dramix 65/60 BG) presented length (lf) and diameter (df), respectively equal to 60 mm and 0.9 mm, form factor (lf/df) = 65, tensile modulus 1.16 MPa and elasticity modulus ≈210 GPa.…”

Section: Characteristics Of the Beamsmentioning

confidence: 99%

“…New technologies have been introduced to supplement several mechanical restrictions, such as reinforced concrete where reinforcement is provided by ductile material bars (steel, carbon or glass fiber) or, more recently, by discrete fibers placed in the concrete. Mobasher et al (2015) highlights the great viability of steel-fiber-reinforced concrete (SFRC), since the reinforcement mechanism provided by the fibers improves strain, flexure, shearing, fatigue, energy absorbing capacity, cracking control and ductility. It should be enhanced that several research works have also demonstrated the contribution of steel fibers, either as sole Francisco André Castro e Silva reinforcement or as hybrid composition (fiber+stirrups) for shear strength.…”

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confidence: 99%

Experimental analysis of the efficiency of steel fibers on shear strength of beams

Gomes

Oliveira

Neto

et al. 2018

Lat. Am. j. solids struct.

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The efficiency of steel fibers for shear strength of reinforced concrete beams is assessed. Four beams were evaluated: control consisted of one beam without any steel fibers and three beams with reinforced concrete with steel fibers. All beams were reinforced for shear strength by a minimum reinforcement rate. The influence of fiber content added to concrete, at 0.5%, 0.8% and 1.0%, and the possibility of partial or total replacement of conventional shear reinforcement (stirrups) by steel fibers were evaluated. Results showed a significant increase in ductility and stiffness of the beams with steel fibers and, consequently, changes in the failure mode were observed, of shear (control beam) to flexure behavior (beams with steel fibers).

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Influence of polypropylene fibers on the flexural behavior of reinforced concrete slabs with different opening shapes and sizes

Al-Rousan

2017

Structural Concrete

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Funding informationNone.The effect of polypropylene fibers (PF) on the flexural behavior of reinforced concrete one-way slabs with opening was investigated in this paper. The evaluated parameters included four different PF volume percentages (0, 0.3, 0.6, and 0.9%), with and without opening, two opening shapes (square and circular), and three opening sizes (100, 150, and 200 mm). Three groups of tested slabs were casted: without opening, with square opening, and circular opening, resulting in a total of 28 slabs. The behavior of each slab was evaluated in terms of the cracking load, ultimate capacity, initial and yielding stiffness, deflection ductility, and energy ductility. In addition, the steel and concrete strains, crack opening, and mode of failure were measured and monitored. The minimum design load capacities were calculated theoretically based on the sectional analysis and compared with the tested ones. The results showed that the use of PF at percentages greater than 0.6% significantly enhanced the performance parameters of the slabs with small opening size (2% opening ratio) and provided acceptable enhancement for slabs with large opening size (8% opening ratio). Therefore, the PF can be optimized to substitute the conventional steel reinforcement of slabs with small openings, especially circular openings. K E Y W O R D S flexural behavior, polypropylene fiber, reinforced concrete, sectional analysis, slab opening

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Analytical solutions for flexural design of hybrid steel fiber reinforced concrete beams

Cited by 75 publications

References 37 publications

Flexural Design Procedures for UHPC Beams and Slabs

Flexural Design Procedures for UHPC Beams and Slabs

Experimental analysis of the efficiency of steel fibers on shear strength of beams

Influence of polypropylene fibers on the flexural behavior of reinforced concrete slabs with different opening shapes and sizes

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