Theoretical and Experimental Investigation on the Flexural Behaviour of Prestressed NC-UHPC Composite Beams

Lin, Pengzhen; Yan, Weiyi; Zhao, Hua; Ma, Junjun

doi:10.3390/ma16020879

Cited by 3 publications

(4 citation statements)

References 39 publications

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“…The UHPC-NC composite beam was developed to reduce the high initial cost of materials, which influences the application of UHPC in structures. In addition, a higher load-carrying capacity and increased cracking resistance are expected for the UHPC-NC composite beam compared with RC beams [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Fatigue Behavior of Reinforced UHPC-NC Composite Beams under Cyclic Loading

Wang,

Ji,

et al. 2024

Materials

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Ultra-high-performance concrete (UHPC), a new cement-based material that offers high mechanical strength and good durability, has been widely applied in construction and rehabilitation projects in recent years. An optimum bending system is achieved by positioning the UHPC layer at the bottom tensile zone of the composite beam and placing the normal-strength concrete (NC) layer at the upper compression zone, which is described as the UHPC-NC composite beam. The fatigue behavior of reinforced UHPC-NC composite beams was described in this study, with an emphasis on the effects of UHPC layer thickness and fatigue load level on the fatigue life of the beam, deformation of the interface between UHPC and NC layers, as well as the bending stiffness of the beam. A total of 9 reinforced UHPC-NC composite beams were tested under cyclic loading. The test variables include UHPC layer thicknesses (zero, 200, and 360 mm), reinforcement ratios (1.184% and 1.786%), and the upper load levels (0.39~0.65). The results showed that good bonding had been achieved without delamination between UHPC and NC layers prior to the final fatigue failure of the beam, and the bending stiffness of the composite beam experienced a three-stage reduction under cyclic loading. Furthermore, an equation was proposed to predict the stiffness reduction coefficient of UHPC-NC composite beams under cyclic loading.

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Section: Introductionmentioning

confidence: 99%

Experimental Research on Fatigue Behavior of Reinforced UHPC-NC Composite Beams under Cyclic Loading

Wang,

Ji,

et al. 2024

Materials

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“…Although it is difficult to precisely control the properties of concrete, a gradient structure can also enhance the macro-performances with different components and mix proportions [ 28 , 29 , 30 , 31 ]. Several investigations have reported on UHPC-NC combined structures [ 32 , 33 , 34 , 35 , 36 ]. Zhang et al [ 37 ] studied the NC-UHPC composite members in continuous box-girder bridges.…”

Section: Introductionmentioning

confidence: 99%

“…Here, two 2200 mm long NC-UHPC composite columns consisting of UHPC and NC columns were experimentally tested, and the results showed that the creep coefficients of the NC-UHPC significantly decreased compared with NC beams. Lin et al [ 34 ] explored the bending performance and cracks of railway T-beams composited with UHPC and NC. Three slab specimens with a cross-section of 300 × 600 mm and a height of 650 mm were prepared using UHPC and NC composites, and it was found that the strength and cracking moment was reduced in the composite structures.…”

Section: Introductionmentioning

confidence: 99%

“…Three slab specimens with a cross-section of 300 × 600 mm and a height of 650 mm were prepared using UHPC and NC composites, and it was found that the strength and cracking moment was reduced in the composite structures. Some simulated models were also reported to reveal the bending performance and cracking of UHPC-NC composite structures [ 34 , 35 , 36 ]. Majid [ 38 ] developed an FE model to predicate the flexural behavior of UHPC-NC beams with four different steel fiber ratios, and the results revealed that, for a reinforcement ratio of 0.009, a hybrid UHPC-NC beam with only the middle 50% composed of UHPC achieved the same capacity as a beam made entirely of UHPC when the NC’s compressive strength was 30 MPa or more.…”

Section: Introductionmentioning

confidence: 99%

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Finite Element Analysis of Bonding Property and Flexural Strength of WUHPC-NC Gradient Concrete

Tian,

Ma,

Sun

et al. 2023

Materials

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Ultra-high-performance concrete (UHPC) has greater mechanical and durability performance than normal concrete (NC). Using a limited dosage of UHPC on the external surface of NC to form a gradient structure could significantly improve the strength and corrosion resistance of the concrete structure and avoid the problems caused by bulk UHPC. In this work, white ultra-high-performance concrete (WUHPC) was selected as an external protection layer for normal concrete to construct the gradient structure. WUHPC of different strengths were prepared, and 27 gradient WUHPC-NC specimens with different WUHPC strengths and interval times of 0, 10, and 20 h were tested using splitting tensile strength to reveal the bonding properties. Fifteen prism gradient specimens with the size of 100 × 100 × 400 mm and a WUHPC ratio of 1:1, 1:3, and 1:4 were tested using the four-pointed bending method to study the bending performance of the gradient concrete with different WUHPC thicknesses. Finite element models with different WUHPC thicknesses were also built to simulate the cracking behaviors. The results showed that the bonding properties of WUHPC-NC were stronger with less interval time and reached the maximum of 1.5 MPa when the interval was 0 h. Moreover, the bond strength first increased and then decreased with the decline in the strength gap between WUHPC and NC. When the thickness ratios of WUHPC to NC were 1:4, 1:3, and 1:1, the flexural strength of the gradient concrete improved by 89.82%, 78.80%, and 83.31%, respectively. The major cracks rapidly propagated from the 2 cm position to the bottom of the mid-span, and the thickness of 1:4 was the most efficient design. The results simulated by finite element analysis also proved that the elastic strain at the crack propagating point was the minimum and was easier to crack. The simulated results were in good accordance with the experimental phenomenon.

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Shear failure analysis of UHPC-NC composites interface with U-shaped studs

Lin,

Wu,

Zhang

et al. 2024

Structures

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Theoretical and Experimental Investigation on the Flexural Behaviour of Prestressed NC-UHPC Composite Beams

Cited by 3 publications

References 39 publications

Experimental Research on Fatigue Behavior of Reinforced UHPC-NC Composite Beams under Cyclic Loading

Experimental Research on Fatigue Behavior of Reinforced UHPC-NC Composite Beams under Cyclic Loading

Finite Element Analysis of Bonding Property and Flexural Strength of WUHPC-NC Gradient Concrete

Shear failure analysis of UHPC-NC composites interface with U-shaped studs

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