Experimental investigation on flexural cracking behavior of ultrahigh performance concrete beams

Qiu, Minghong; Shao, Xudong; Zhu, Yanping; Zhan, Jian Hui; Yan, Banfu; Wang, Yan

doi:10.1002/suco.201900339

Cited by 45 publications

(15 citation statements)

References 20 publications

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“…Additionally, this figure demonstrated that increasing ρ notably decreases the crack opening width of the UHPC beams at the same service loading. It is worth noting that this finding is inconsistent with that reported by Qiu et al [52]. Another significant observation is that increasing reinforcement ratio contributed to stabilizing the crack propagation, as the slope of the UHPC beam's load-crack curve increases as its bar reinforcement increases.…”

Section: Ductility Analysiscontrasting

confidence: 72%

Behavior of Non-Shear-Strengthened UHPC Beams under Flexural Loading: Influence of Reinforcement Percentage

et al. 2021

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In the present work, the structural responses of 12 UHPC beams to four-point loading conditions were experimentally and analytically studied. The inclusion of a fibrous system in the UHPC material increased its compressive and flexural strengths by 31.5% and 237.8%, respectively. Improved safety could be obtained by optimizing the tensile reinforcement ratio (ρ) for a UHPC beam. The slope of the moment–curvature before and after steel yielding was almost typical for all beams due to the inclusion of a hybrid fibrous system in the UHPC. Moreover, we concluded that as ρ increases, the deflection ductility exponentially increases. The cracking response of the UHPC beams demonstrated that increasing ρ notably decreases the crack opening width of the UHPC beams at the same service loading. The cracking pattern the beams showed that increasing the bar reinforcement percentages notably enhanced their initial stiffness and deformability. Moreover, the flexural cracks were the main cause of failure for all beams; however, flexure shear cracks were observed in moderately reinforced beams. The prediction efficiency of the proposed analytical model was established by performing a comparative study on the experimental and analytical ultimate moment capacity of the UHPC beams. For all beams, the percentage of the mean calculated moment capacity to the experimentally observed capacity approached 100%.

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Section: Ductility Analysiscontrasting

confidence: 72%

Behavior of Non-Shear-Strengthened UHPC Beams under Flexural Loading: Influence of Reinforcement Percentage

et al. 2021

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“…17 However, the effect of reinforcement diameter and UHPC cover thicknesses on the flexural performance of reinforced UHPC beams is not well understood. 18 In addition, many scholars have proposed the prediction model of flexural capacity for rebar-reinforced UHPC beams or steel fibers reinforced beams. [19][20][21][22] However, they mainly focus on the prediction of the maximum load considering the contribution of UHPC's tensile strength and reinforcement's yielding strength.…”

Section: Introductionmentioning

confidence: 99%

“…As above‐mentioned, the flexural and ductile behaviors of reinforced UHPC beams have been well investigated by many researchers, and their investigations mainly focus on the effects of reinforcement ratio, 9–15 fiber properties, 8,10,12,15,16 and type of reinforced bars 17 . However, the effect of reinforcement diameter and UHPC cover thicknesses on the flexural performance of reinforced UHPC beams is not well understood 18 …”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on flexural and ductile behaviors of rebar‐reinforced ultra‐high‐performance concrete beams

Qiu

Shao

et al. 2022

Structural Concrete

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This paper experimentally investigated the flexural and ductile behaviors of ultra-high-performance concrete (UHPC) beams. The failure modes, deflection, ductility, concrete strain, and reinforcement strain were tested using eight UHPC rectangular beams. The experimental parameters were the reinforcement ratio, the reinforcement diameter, and the UHPC cover thickness. The experimental results showed that all specimens exhibited flexural failure characterized by the yielding of steel rebars, multiple micro-cracks, one localized macro-crack, and slight crushing of UHPC. It was concluded that increasing the reinforcement ratio significantly enhanced the stiffness, flexural capacity, and ductility of the rebar-reinforced UHPC beams, whereas showed little effect on their cracking load. Meanwhile, both the reinforcement diameter and UHPC cover thickness in the range investigated here had little influence on the flexural performance of UHPC beams in the elastic stage and crack development stage, whereas exhibited different influences in the yield stage. Besides, increasing the reinforcement ratio was in favor of presenting the deflectionhardening behavior, while the reinforcement diameter and UHPC cover thickness had little influence on the deflection-hardening behavior. The analytical models were established to predict the yielding load, peak load, and ultimate load of rebar-reinforced UHPC beams, and the predictions showed good agreement with the experimental results in this study. Also, the steel reinforcement could show a dominant role in the bearing capacity by increasing the reinforcement ratio. A post-yielding capacity factor λ was proposed, which could Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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“…The effectiveness of using UHPC to enhance the torsion resistance of reinforced concrete beams was justified by experimental work 16 . Qiu 17 conducted an experimental study on the flexural cracking behavior of UHPC beams. Eight UHPC beams were tested and analyzed regarding their crack pattern, crack spacing and load‐crack width curves.…”

Section: Introductionmentioning

confidence: 99%

Experimental study and calculation method on the flexural resistance of reinforced concrete beam strengthened using high strain‐hardening ultra high performance concrete

Sun

Liu

2021

Structural Concrete

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In this study, the efficiency of using high strain hardening ultra high performance concrete (HSH‐UHPC) on strengthening existing reinforced concrete beams was investigated by experimental and analytical means. First, the HSH‐UHPC constitutive relation was obtained using “Dog‐bone” specimen under uniaxial tensile test. Then three reinforced concrete beams strengthened with HSH‐UHPC layers and one control beam were tested under flexural loading. The midspan deflection, strain distribution, crack propagation and failure mode of the tested beams were described in detail. The tests verified that the middle section of UHPC‐NC composite beam basically conforms to the assumption of plane section. The flexural resistance of composite structure can be greatly improved by installing proper longitudinal reinforcement in UHPC layer. Meanwhile, numerical studies have been conducted on the tested beams using the experimentally obtained constitutive relations. The result shows that the finite element analysis results are consistent with the test results. Finally, a contribution factor for the HSH‐UHPC layer on the flexural resistance of the composite beam was proposed. At the same time, it is found that the contribution efficiency of the HSH‐UHPC to the flexural resistance increases with longitudinal reinforcement ratios in the HSH‐UHPC.

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Experimental investigation on flexural cracking behavior of ultrahigh performance concrete beams

Cited by 45 publications

References 20 publications

Behavior of Non-Shear-Strengthened UHPC Beams under Flexural Loading: Influence of Reinforcement Percentage

Behavior of Non-Shear-Strengthened UHPC Beams under Flexural Loading: Influence of Reinforcement Percentage

Experimental investigation on flexural and ductile behaviors of rebar‐reinforced ultra‐high‐performance concrete beams

Experimental study and calculation method on the flexural resistance of reinforced concrete beam strengthened using high strain‐hardening ultra high performance concrete

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