Calculation method for flexural capacity of high strain‐hardening ultra‐high performance concrete T‐beams

Liu, Chao; Zhang, Yuxin; Yao, Yuan; Huang, Yuhao

doi:10.1002/suco.201800151

Cited by 27 publications

(23 citation statements)

References 17 publications

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“…This indicates that the tension carried by UHPC decreases as the longitudinal reinforcement ratio increases, because the tension carried by rebar increases as the longitudinal reinforcement ratio increases. By taking the relationship between the reduction factor and the longitudinal reinforcement ratio into consideration, the predictive equations for the ultimate flexural capacity of T-shaped UHPC beams were proposed, and agreed well with the experimental result in this study and previous studies [ 29 , 31 , 32 ]. The other constitutive models of UHPC, with different linearity, have not been used to verify the validity of the proposed equation in this study; this could be the objective of a future study.…”

Section: Discussionsupporting

confidence: 86%

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Flexural Behavior of T-Shaped UHPC Beams with Varying Longitudinal Reinforcement Ratios

Chen

et al. 2021

Materials

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In order to investigate the transverse flexural behavior of the UHPC waffle deck, a total of six T-shaped UHPC beams, with varying longitudinal reinforcement ratios, were tested and analyzed. The experiments, including material tests of UHPC and beam tests, were conducted. The material tests of UHPC revealed that strain-hardening behavior in tension was exhibited, and the ratio of uniaxial compressive strength-to-cubic compressive strength was 0.85. The beam tests showed that all the T-shaped UHPC beams, even without longitudinal rebar, exhibited ductile behavior that was similar to that of properly reinforced concrete beams. As the longitudinal reinforcement ratio increased, more flexural cracks developed and a larger load-carrying capacity was provided. Furthermore, the sectional analysis for the ultimate flexural capacity of T-shaped UHPC beams was conducted. Simplified material models, under tension and compression, for UHPC were developed. Based on the reverse calculation from the experimental result, the relation between reduction factor to the ultimate tensile strength of UHPC, and longitudinal reinforcement ratios was formulated. As a result, the predictive equations for the ultimate flexural capacity of T-shaped UHPC beams were proposed, and agreed well with the experimental results in this study and existing studies, which indicates good validity of the proposed equations.

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Section: Discussionsupporting

confidence: 86%

“…The existing experimental results about T-shaped UHPC beams [ 29 , 31 , 32 ] were employed to verify the validity of the proposed equations. The key parameters, and experimental and predicated ultimate flexural capacity of nine T-shaped UHPC beams are summarized in Table 8 .…”

Section: Theoretical Studies On Ultimate Flexural Capacitymentioning

confidence: 99%

Flexural Behavior of T-Shaped UHPC Beams with Varying Longitudinal Reinforcement Ratios

Chen

et al. 2021

Materials

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“…The UHPC is high strain-hardening UHPC, it can work together with the reinforcement during whole loading process. 10 The uniaxial mechanical tests of UHPC, concrete and steel reinforcing bars were carried out before the shear experiments of composite beams. The experimental specimen of the UHPC uniaxial tension test was "dog bone", as shown in Figure 1.…”

Section: Materials Matrixmentioning

confidence: 99%

Numerical analysis on shear resistance of ultra‐high performance concrete‐normal strength concrete composite beam

Liu

2021

Structural Concrete

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Ultra-high performance concrete-normal strength concrete (UHPC-NC) composite beam is a brand-new composite structure. UHPC-NC composite beam not only has the interfacial problem of the two materials, but its shear resistance should be investigated, which directly determines the mechanical performance and engineering value. In this article, the finite element analysis (FEA) method combined with the UHPC-NC composite beam shear experiment are used to analyze the shear resistance of the composite beam and the influence of the interfacial zone on the shear behavior. The shear span-to-depth ratio, UHPC layer, and longitudinal reinforcement of specimens are designed to study the shear mechanism. Then the FEA model is used to simulate the cooperative working properties of the concrete beam and the UHPC layer, which includes two conditions-slip and no-slip. The shear resistance, load-span deflection curve and the strain of longitudinal reinforcement of the UHPC-NC composite beams are analyzed and studied in combination with the results of shear experiment. The results show that the UHPC-NC composite beam can effectively improve the ultimate shear resistance and ductility of the beam. At the same time, the interfacial zone of UHPC-NC composite beam at the ultimate stage is a weak area, the cracking of that will has adverse effects on the mechanical properties of the composite beam, which needs to be paid attention to in the structural design. K E Y W O R D S composite beam, finite element analysis, interfacial zone, ultra-high performance concrete 1 | INTRODUCTION Ultra-high performance concrete (UHPC) is a new type of ultra-high performance cement-based composite material, which is defined that it has pre-and post-cracking strength greater than 5 MPa and compressive strength beyond 150 MPa by MCS-EPFL document. 1The toughness and crack resistance of UHPC are improved with the addition of steel fibers. At the same time, due to the optimized grade of UHPC matrix, the corresponding water-cement ratio and porosity are greatly reduced, which ensure that UHPC has the excellent impermeability and durability compared with

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“…The results indicated that crack width of UHPC increased linearly with the increase of applied load until the yielding of reinforcement. Liu 18 carried out four‐point loading tests on five specimens and developed a calculation method for the ultimate flexural resistance of UHPC T‐beam. The analysis results proved that the bond between reinforcement and UHPC is reliable and they can maintain strain consistency before the reinforcement reaches its yield strength.…”

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

Self Cite

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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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Calculation method for flexural capacity of high strain‐hardening ultra‐high performance concrete T‐beams

Cited by 27 publications

References 17 publications

Flexural Behavior of T-Shaped UHPC Beams with Varying Longitudinal Reinforcement Ratios

Flexural Behavior of T-Shaped UHPC Beams with Varying Longitudinal Reinforcement Ratios

Numerical analysis on shear resistance of ultra‐high performance concrete‐normal strength concrete composite beam

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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