Evaluation of bond behaviors on functionally graded ultra-high performance concrete (FGUHPC) subjected to elevated temperature

Du, Linpu; Pan, Tinghong; Lu, Kaiwei; Wang, Jingquan

doi:10.1016/j.engstruct.2022.115112

Cited by 9 publications

(4 citation statements)

References 35 publications

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“…(8) 4) A similar process is carried out for the reverse Ej sequence, named Ej'. For the sequence Ej', the cumulative number ni and the random variable d2k are defined through Equation (9).…”

Section: Mann-kendall Criterionmentioning

confidence: 99%

“…The research goal was to provide the practical design recommendation for the fire-resistant design of concrete slabs [3][4][5][6][7]. In recent years, more scholars have continued to conduct more in-depth and meticulous experimental studies, mainly focusing on the impact of different types of concrete slabs, fire spread patterns, and boundary restraint conditions on the fire resistance [8][9][10][11][12][13]. Also, they concerned temperature field data, vertical deformation, and fire resistance duration, et al…”

Section: Introductionmentioning

confidence: 99%

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Essential Load-bearing Characteristics of Steel-concrete Composite Floor System in Fire Revealed by Structural Stressing State Theory

Zhang,

Qi,

Wang

et al. 2024

Preprint

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This study reveals the essential load-bearing characteristics of the steel-concrete composite floor system under fire conditions applying structural stressing state theory. Firstly, the strain data in the entire process of the fire test are modeled as state variables which can present the slab’s stressing state evolution characteristics; Then, the state variables are used to build the stressing state mode and the parameter characterizing the mode. Further, the Mann-Kendall criterion is adopted to detect the leap points in the evolution curves of the characteristic parameters during the entire fire exposure process. Also, the evolution curves of the stressing state modes are investigated to verify the leap profiles around the leap/characteristic points; Finally, the detected leap points are defined as the failure starting points and elastoplastic branching points, which is unseen in the past researches focusing on the failure endpoint defined at the ultimate load-bearing state of the composite floor system. The failure starting point and the elastoplastic branching point are the embodiment of natural law from quantitative change to quality change of a system rather than an empirical and statistical judgment. Hence, both characteristic points avoidably exist in the strain data of the composite floor system undergoing the fire process, which can be revealed through the proper modeling methods and update the existing theories and methods on structural analysis and design in fire.

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Section: Mann-kendall Criterionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Essential Load-bearing Characteristics of Steel-concrete Composite Floor System in Fire Revealed by Structural Stressing State Theory

Zhang,

Qi,

Wang

et al. 2024

Preprint

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show abstract

“…In comparison with conventional precast concrete pavement, the ideal construction exhibited good fatigue resistance and around 40 percent reduced slab curling. Du Linpu et al, [6] discussed about Ultra-high-performance (UHPC) & lightweight aggregate concrete (LWAC) to create the functionally graded two-layer concrete slab. Fire experiments were conducted in order to have a better understanding of fire resistance behaviors.…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study on Properties of Multi Layered Concrete Elements

Manjunath N K,

N. Jayaramappa,

Akshatha K V

2024

Int Res J Adv Engg Hub

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A particular concrete grade is frequently used in traditional concrete building, with strength and its durability being the main priorities. In order to understand it’s impact on structural performance as well as visual appeal, this project tests several grades of concrete within a structural element, challenging the traditional method. Higher grade mixtures, like M60, have merits in terms of enhanced strength and durability, while lower grade mixes could be appropriate for some applications. Considering the bottom concrete zone in high-strength reinforced concrete beams primarily struggles tension, supported by reinforcement, while the upper zone suffers compression, the concrete in the bottom zone is not obliged to be equally strong as that of the top zone. Three totally different concrete grades, Low strength concrete (LSC) M10, Normal strength concrete (NSC) M20 and High strength concrete (HSC) M60 have been analyzed in this study. The compressive, flexural, and split tensile strengths of NSC, LSC, and HSC concrete have been investigated distinctly for each concrete grade as well as their combinations such as 1/3 NSC at the bottom and 2/3 HSC at the top and vice versa, 1/3 HSC from the top, 1/3 NSC from the bottom of the soffit, and the remaining 1/3 LSC at the center using cubes, prisms, and cylinders, respectively. The research also focused on the characteristic features of concrete's durability, such as the depth of chlorine penetration and water absorption. The acquired results improve our understanding of the mechanical and durability characteristics of the concrete by recommending a phased casting approach that makes use of many grades of concrete.

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“…According to the numerical results, the authors believed that the delamination failure could be avoided when the interfacial cohesive stiffness was higher than three. Du et al (2023) designed a two-layered FGC member composed of UHPC layers and LWAC layers, debonding tests were conducted to evaluate the interfacial bond performance under different temperatures (20°C-1200°C), besides, the effect of cast-in bolts on bond strength were investigated. The results revealed that the bond strength was dramatically decreased with temperature, after 1200°C heating, the residual bond strength was reduced by around 95% compared with that under ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical studies on postfire behavior of functionally graded ultra-high performance concrete

Du,

Ji,

et al. 2023

Advances in Structural Engineering

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In order to improve structural fire-resistant behaviors, this paper designed a two-layer functionally graded ultra-high performance concrete (FGUHPC) structure composed of a UHPC layer and a lightweight aggregate concrete (LWAC) layer. UHPC layers are adopted to provide structural bearing capacity and protected by LWAC layers from elevated temperature. Splitting tensile tests and three-point flexural tests were conducted under ambient and elevated temperatures to evaluate interfacial bond performance and flexural bearing capacity, where two interfacial treatments were adopted and compared. The experimental results revealed that FGUHPC members exhibited good integrity during heating, no explosive spalling occurred and the maximal temperature at interfacial regions was 266°C. The interfaces showed desirable bond performance under ambient temperature while the splitting tensile strength was decreased by around 85% in the case of high temperature. Flexural test results indicated that the structural stiffness would be reduced by around 42% under elevated temperature, as a result, the maximal deflection was increased from 2.5 mm to 3.7 mm. SWM could significantly improve interfacial bond performance and prevent debonding failure of specimens at the postfire state, leading to higher structural bearing capacities. The bearing capacities of specimens with and without interfacial treatments were 42.7 kN and 38.4 kN respectively under ambient temperature, which remained about 88% after elevated temperature.

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Evaluation of bond behaviors on functionally graded ultra-high performance concrete (FGUHPC) subjected to elevated temperature

Cited by 9 publications

References 35 publications

Essential Load-bearing Characteristics of Steel-concrete Composite Floor System in Fire Revealed by Structural Stressing State Theory

Essential Load-bearing Characteristics of Steel-concrete Composite Floor System in Fire Revealed by Structural Stressing State Theory

Feasibility Study on Properties of Multi Layered Concrete Elements

Experimental and theoretical studies on postfire behavior of functionally graded ultra-high performance concrete

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