High rate response of ultra-high-performance fiber-reinforced concretes under direct tension

Tran, Ngoc Thanh; Tran, Tuan Kiet; Kim, Dong-Joo

doi:10.1016/j.cemconres.2014.12.008

Cited by 118 publications

(41 citation statements)

References 20 publications

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“…The term for the participation of the transverse reinforcement is determined by the truss model. The term for the participation of the fibres is determined as (5) where S is resistance area of fibres, estimated as 0.9b 0 d for rectangular or Tee sections; β u is inclination of diagonal compression struts; γ bf is the partial safety factor and is average stress acting on the concrete cross section; b w is web width; d is effective depth; A sw is area of stirrups; s w is spacing of stirrups; z is effective shear depth; ƒ ywd is yield strength of stirrups; θ is compressive stress field inclination.…”

Section: Fib Mode Code 2010mentioning

confidence: 99%

“…Ultra-high performance concrete (UHPC) is a new class of concrete with ultra-high compressive strength and considerable tensile strength that has been developed in recent years due to its superior mechanical and durability properties [1][2][3][4]. High strength steel fibres are dispersed randomly in the densified matrix to improve the strength and ductility to create ultra-high performance fibre reinforced concrete (UHPFRC) [5][6]. The material strength of normal strength concrete has limitations in the application of high strength steel (HSS) according to the deformation compatibility principle.…”

Section: Introductionmentioning

confidence: 99%

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Post‐cracking shear strength and deformability of HSS‐UHPFRC beams

John

Wang

et al. 2016

Structural Concrete

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Post-cracking shear strength and deformability of HSS-UHPFRC beamsEleven T-beams, reinforced with high strength steel, were tested to failure to investigate the effect of shear span to depth ratio, fibre ratio, fibre type, concrete strength and stirrup ratio on the shear behaviour, especially post-cracking shear strength and deformability, of ultra-high performance fibre reinforced concrete (UHPFRC) beams. Test results indicated that fibres were efficient not only in enhancing the post-cracking shear strength, but also in improving the post-cracking deformability of UHPFRC beams. In addition, fibres could bridge the cracks and help in redistributing and homogenizing the concrete stress beside the cracks, allowing more short fine diagonal shear cracks with small spacing to develop around the existing cracks. A moderate amount of stirrups can effectively restrain shear cracks and allow more parallel diagonal shear cracks to develop and propagate thoroughly within the shear span. The stiffness of the UHPFRC beams at ultimate state was about 50 % of initial beam stiffness, which was considerable in strength calculations and ductility analysis, especially in seismic performance evaluation. Lastly, the current shear provisions were evaluated using the experimental results.

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Section: Fib Mode Code 2010mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Post‐cracking shear strength and deformability of HSS‐UHPFRC beams

John

Wang

et al. 2016

Structural Concrete

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“…e tensile strength and ultimate tensile strain of UHPC could be as high as 8 MPa and 1% [5][6][7][8]. Due to these remarkable mechanical properties, applying of UHPC will decrease self-weight of structures and reduce the cracking risk effectively [9,10].…”

Section: Introductionmentioning

confidence: 99%

Flexural Behavior of the Innovative CA-UHPC Slabs with High and Low Reinforcement Ratios

Feng

Wang

et al. 2019

Advances in Materials Science and Engineering

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This paper presents an experimental study on the flexural behavior of an innovative CA-UHPC (ultrahigh-performance concrete containing coarse aggregate) slab with high and low reinforcement ratios. A total of eighteen CA-UHPC slabs were tested to failure under the parameters of longitudinal reinforcement ratio, curing method, and maximum aggregate size. Test results indicated that sufficient longitudinal reinforcement should be embedded to prevent the brittle failure and disastrous damage. High ductile failure mode was observed for specimens with high reinforcement ratio compared with specimens with low reinforcement ratio. Instead of extensively crushing as normal strength concrete, delamination failure appeared in the compression zone of the CA-UHPC slabs owing to the fibers’ bridging effect, the yielding of longitudinal reinforcement, and the large expansion of flexural cracks which led to the final failure. The reinforced CA-UHPC slabs demonstrated excellent deformability, and ultimate ratio of deflection to span increased from 1/281 to 1/12 when the reinforcement ratio raised from 0% to 3.45%. Stiffness of the reinforced specimens at the flexural cracking state was about 88% and only approximately 6% at the ultimate state, but nearly 50% of the initial stiffness remained when the longitudinal reinforcements yielded, which indicated superior load resistance ability and excellent postcracking deformability. A new ductility index was proposed to evaluate the postcracking ductility of the CA-UHPC specimens. Finally, test results were compared with the flexural strength predictions of CECS 38-2004, ACI 544.4R, and BS EN 1992.

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“…Other high strain rate tensile tests were conducted by Lindholm and Yeakley [11], Nicholas [12], Li et al [13], Cadoni et al [14], Wang et al [15], Li and Xu [16], Song et al [17], Cadoni et al [18], Kim et al. [19,20], Mechtcherine et al [21] and Pyo and El-Tawil [22]. Ultra high performance fiber reinforced concrete (UHP-FRC) has recently gained much attention because of its extremely high pseudo-static mechanical properties [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Direct tensile behavior of ultra high performance fiber reinforced concrete (UHP-FRC) at high strain rates

Pyo

El‐Tawil

Naaman

2016

Cement and Concrete Research

124

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This experimental study investigates the direct tensile behavior of ultra-high performance fiber reinforced concrete (UHP-FRC) at strain rates ranging from 90 to 146 /sec. The tests are conducted using a recently developed impact testing system that uses suddenly released strain energy to generate an impact pulse. Three fiber types were considered, a twisted fiber and two other types of straight fibers. Specimen impact response was evaluated in terms of first cracking strength, post cracking strength, energy absorption capacity and strain capacity. The test results indicate that specimens with twisted fibers generally exhibit somewhat better mechanical properties than specimens with straight fibers for the range of strain rates considered. All UHP-FRC series tested showed exceptional rate sensitivities in energy absorption capacity, generally becoming much more energy dissipative under increasing strain rates. This characteristic highlights the potential of UHP-FRC as a promising cement based material for impact-and blastresistant applications.

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High rate response of ultra-high-performance fiber-reinforced concretes under direct tension

Cited by 118 publications

References 20 publications

Post‐cracking shear strength and deformability of HSS‐UHPFRC beams

Post‐cracking shear strength and deformability of HSS‐UHPFRC beams

Flexural Behavior of the Innovative CA-UHPC Slabs with High and Low Reinforcement Ratios

Direct tensile behavior of ultra high performance fiber reinforced concrete (UHP-FRC) at high strain rates

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