Moment redistribution and post-peak behaviour of lightly reinforced-SFRC continuous slabs

Mahmood, Saba; Foster, Stephen J.; Valipour, Hamid

doi:10.1016/j.engstruct.2020.111834

Cited by 11 publications

(2 citation statements)

References 26 publications

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“…Fiber-reinforced concrete (FRC) is one of several new types of innovative concretes that can be used for structural purposes in accordance with a number of national and international codes, guidelines, and design recommendations [ 1 , 2 , 3 , 4 , 5 , 6 ]. The incorporation of fibers in cement-based composites allows the partial or even total substitution of traditional reinforcement (reinforcing steel bars) with a positive effect on the fracture energy of the matrix [ 7 ], cracking control [ 8 , 9 , 10 , 11 , 12 ], fire resistance [ 13 , 14 , 15 ], fatigue [ 16 , 17 ], redistribution capacity [ 18 , 19 , 20 , 21 ], and impact resistance [ 22 , 23 , 24 , 25 ]. As a result, the application of FRC is already observed in a multitude of structural elements, such as precast tunnel segments [ 26 , 27 , 28 ], elevated flat slabs [ 29 , 30 , 31 ], reinforced earth-retaining walls [ 32 ], and ground-supported flat slabs for industrial applications [ 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Low Temperatures on Flexural Strength of Macro-Synthetic Fiber Reinforced Concrete: Experimental and Numerical Investigation

Aidarov¹,

Nogales²,

Reynvart³

et al. 2022

Materials

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Fiber-reinforced concrete (FRC) is an attractive alternative to traditional steel bar-reinforced concrete structures, as evidenced by the constantly increasing market consumption of structural fibers for this purpose. In spite of significant research dedicated to FRC, less attention has been given to the effects of low temperatures on the mechanical properties of FRC, which can be critical for a variety of structural typologies and regions. With this in mind, an experimental program was carried out to assess the flexural behavior of macro-synthetic fiber-reinforced concrete (MSFRC) at different temperatures (from 20 °C to −30 °C) by means of three-point bending notched beam tests. The tested MSFRCs were produced by varying the content of polypropylene fibers (4 and 8 kg/m3). The results proved that the flexural strength capacity of all MSFRCs improved with decreasing temperature. Finite element analyses were then used to calibrate constitutive models following fib Model Code 2010 guidelines and to formulate empirical adjustments for taking into account the effects of low temperatures. The outcomes of this research are the basis for future experimental and numerical efforts meant to improve the design of MSFRCs subjected to low temperatures during service conditions.

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Section: Introductionmentioning

confidence: 99%

Effects of Low Temperatures on Flexural Strength of Macro-Synthetic Fiber Reinforced Concrete: Experimental and Numerical Investigation

Aidarov¹,

Nogales²,

Reynvart³

et al. 2022

Materials

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“…[9,10] The randomly distributed steel fibers in concrete can effectively arrest the propagation of microcracks and significantly improve the tensile, bending, and impact resistance of concrete. [11,12] By replacing the traditional rebar cage with steel fiber, SFRC can avoid the difficulty of concrete pouring caused by the position overlapping of steel bar and shape steel and improve the integrity and bearing capacity of the concrete, accompanied by the deformation capacity of component was significantly improved. [13][14][15] The average crack widths and deflections of SFRC structures decrease with the increase of fiber stiffness.…”

Section: Introductionmentioning

confidence: 99%

Energy dissipation and damage on the interface of steel and steel fiber‐reinforced concrete composite column

Qian

Zheng

et al. 2022

Structural Design Tall Build

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To address the problems faced with steel-reinforced concrete (SRC) in construction, such as positional conflicts between steel and steel bars or difficulty in pouring concrete, a novel "Steel and Steel Fiber-Reinforced Concrete" (SSFRC) composite structure was proposed. Push-out tests of 34 SSFRC composite columns were carried out in this paper to study the interfacial bond performance from the perspective of energy dissipation. Based on loading-displacement (P-D) curves, the interfacial energy dissipation (W b ) and energy dissipation factor (λ) were introduced, and the influence of embedded length (L e ), steel fiber volume rate (ρ sf ), thickness of concrete cover (C ss ), and section type on W b and λ were analyzed. Test results indicated that circular column is better than square column in terms of W b and λ. The increase of L e , C ss , or ρ sf is beneficial to the improvement of W b , and λ is positively correlated with ρ sf and C ss but negatively correlated with L e . Additionally, the interfacial damage (D a ) was defined by the relationship between elastic deformation energy (W a ) and W b . It can be concluded that the ascent of L e and C ss can effectively delay the appearance of D a and inhibit the development of D a , respectively, and D a develops slowly with the increase of ρ sf at the later loading stage.

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Experimental study on mechanical properties of steel and steel fiber reinforced concrete beams

Zhang

Lin³

et al. 2022

Structural Design Tall Build

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Summary According to the construction difficulties in steel reinforced concrete (SRC) structures, rebar cages were discretized into steel fibers to form steel and steel fiber reinforced concrete (SSFRC) structures. The 18 SSFRC beams without rebar cages were tested under bending, and the effect of the steel fiber volume ratio (ρsf), shaped steel ratio (ρss), and shear span ratio (λ) on mechanical properties were investigated. Increasing ρsf could not only turn shearing failure and debonding failure into bending failure, and effectively reduce the sudden decrease of load, but also enhance the bearing capacity, ductility, and damage resistance of specimens to a certain extent. As the ρss ascended, the mechanical properties were obviously improved. However, ρsf should be accordingly increased to avoid adverse effects of excessive ρss. The specimen with small λ had the better bearing and energy dissipation capacity and poor ductility. A large λ meant that ρss and ρsf should be appropriately increased to prevent premature failure of specimens.

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Moment redistribution and post-peak behaviour of lightly reinforced-SFRC continuous slabs

Cited by 11 publications

References 26 publications

Effects of Low Temperatures on Flexural Strength of Macro-Synthetic Fiber Reinforced Concrete: Experimental and Numerical Investigation

Effects of Low Temperatures on Flexural Strength of Macro-Synthetic Fiber Reinforced Concrete: Experimental and Numerical Investigation

Energy dissipation and damage on the interface of steel and steel fiber‐reinforced concrete composite column

Experimental study on mechanical properties of steel and steel fiber reinforced concrete beams

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