Flexural behavior of concrete beams reinforced with high-strength steel bars after exposure to elevated temperatures

Zhao, Jun; Jiang, Yibo; Li, Xiaopeng

doi:10.1016/j.conbuildmat.2023.131317

Cited by 13 publications

(2 citation statements)

References 35 publications

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“…Therefore, the failure and degradation mechanisms of RC beams has been a subject of considerable interest to researchers and engineers [1][2][3][4]. Numerous studies have extensively explored the behavior of RC beams under various loading conditions [5][6][7][8][9][10][11][12][13][14]. They have studied how factors like impact velocity, reinforcement arrangement, and concrete strength influence their impact failure patterns.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Fracture Behavior in Single-Edge Notched Beams Reinforced with Steel Bars or CFRP Bars

Wang,

Yang,

Song

et al. 2024

Materials

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To explore and compare the failure modes, deformation behaviors, and load-bearing capacities of single-edge notched (SEN) beams strengthened with carbon fiber-reinforced polymer (CFRP) and steel bars, static and dynamic three-point bending tests on both types of concrete beams have been carried out in this study. During the static tests, the electro-hydraulic servo machine served as a loading device to apply pressure to CFRP beams and reinforced concrete (RC) beams. During the impact experiments, different impact velocities were imparted by adjusting the drop hammer’s height. Thus, information regarding crack propagation, energy absorption, and deformation was obtained. The results from the static tests showed that the RC beams predominantly experienced shear failure. In contrast, the CFRP beams primarily exhibited bending–shear failure, attributed to the relatively weaker bond strength between the bars and the concrete. Impact tests were conducted at three different velocities in this study. As the impact velocity increased, both types of concrete beams transitioned from bending failure to bending–shear failure. At the lowest velocity, the difference in energy absorption between beams reinforced with different materials was insignificant during the bending process. However, at the highest velocity, CFRP beams absorbed less energy than RC beams. The study of structures’ impact failure modes and their mechanical characteristics offers valuable references for the anti-collision design and protection of structures.

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Section: Introductionmentioning

confidence: 99%

Comparison of Fracture Behavior in Single-Edge Notched Beams Reinforced with Steel Bars or CFRP Bars

Wang,

Yang,

Song

et al. 2024

Materials

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“…In some high-rise large-span structures, the use of low-strength steel will result in the problem of 'fat beams and columns', not only increasing the consumption of steel, but also making them difficult to tie, and more difficult to ensure the quality of concrete pouring. Vigorously promoting high-strength bars in construction projects is an important measure for energy saving and emission reduction and providing engineering structure quality [5,6], which is of great significance for promoting the structural adjustment, transformation, and upgrading of the iron and steel industry and construction. However, existing high-strength bars have poor ductility and toughness and are prone to brittle fracture, which limits their application in engineering structures.…”

Section: Introductionmentioning

confidence: 99%

Study on the Bending Performance of High-Strength and High-Ductility CRE-Reinforced Concrete Beams

Zhang,

Sun,

Yang

et al. 2023

Buildings

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Constant resistance energy (CRE) steel reinforcement has a yield strength of up to 750 MPa and an ultimate elongation of more than 20%. CRE reinforcement overcomes the contradiction between high yield strength and high uniform elongation of ordinary high-strength bars. This paper explores the flexural performance and load-carrying mechanisms of CRE-reinforced concrete beams through a series of experiments, while also presenting a theoretical analytical method for such specimens. Flexural tests on six CRE-reinforced concrete beams and two control tests on hot-rolled ribbed bar 400 (HRB400)-reinforced concrete beams were conducted in this paper. The study examines the influence of the shear–span ratio and reinforcement type on the mechanical response of the beams, including cracking load, yield load, and ultimate load, while analyzing the variation patterns of concrete strain and reinforcement strain. The experimental results demonstrate that as the shear–span ratio decreases, the crack resistance and load-carrying capacity of CRE-reinforced concrete beams improve. Under equivalent conditions, CRE-reinforced concrete beams exhibit higher load-carrying capacity compared to HRB-reinforced concrete beams, surpassing the latter by approximately 43% in terms of ultimate load. Additionally, this paper proposes a calculation method for the mechanical response of NPR-reinforced concrete beams and compares the theoretical values with the experimental values. The differences between the two are within 13%, which proves the reliability of the calculation method.

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Cyclic tensile response and crack closure performance of novel superelastic Ni-Ti SMA cable grid-reinforced engineered cementitious composites

Qian,

Wu,

Shi

et al. 2024

Construction and Building Materials

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Flexural behavior of concrete beams reinforced with high-strength steel bars after exposure to elevated temperatures

Cited by 13 publications

References 35 publications

Comparison of Fracture Behavior in Single-Edge Notched Beams Reinforced with Steel Bars or CFRP Bars

Comparison of Fracture Behavior in Single-Edge Notched Beams Reinforced with Steel Bars or CFRP Bars

Study on the Bending Performance of High-Strength and High-Ductility CRE-Reinforced Concrete Beams

Cyclic tensile response and crack closure performance of novel superelastic Ni-Ti SMA cable grid-reinforced engineered cementitious composites

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