Dynamic response of GFRP-reinforced UHPC beams under close-in blast loading

Yan, Junbo; Liu, Yan; Bai, Fan; Ni, Xiaowu; Xu, Yingliang; Yan, Zichen; Huang, Fenglei

doi:10.1016/j.matdes.2022.111140

Cited by 13 publications

(2 citation statements)

References 46 publications

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“…Two lower hinge supports accompanied by two load cells (below the lower hinge supports) shown in Figure 2a were fixed on the steel base to support the F I G U R E 1 Specifications for specimens and reinforcements. 23,24 T A B L E 1 Reinforcement mechanical properties. tested beam specimens.…”

Section: Methodsmentioning

confidence: 99%

“…The specimens were designed based on GB50010-2010. 22 In addition, to compare the RC beam damage in the near-field blast test to that under far-field blast loading, the specimen dimensions were modified based on the design in Yan et al 23 and Li et al 24 Figure 1 presents the geometrical dimensions and the reinforcement of the specimens. The length, height, and thickness of all beams were 2,440, 250, and 125 mm, respectively, with an effective span of 2,232 mm.…”

Section: Specimen Descriptionmentioning

confidence: 99%

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Effect of load details of the successive explosions on the blast behaviors of reinforced concrete beams

Xu,

Liu,

Huang

et al. 2023

Structural Design Tall Build

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SummaryThe objective of this study was to study the effect of load details of successive explosions on the blast behaviors of reinforced concrete (RC) beams. First, the effect of the successive loading of two identical explosions was discussed by considering the influences of standoff distance, charge mass on the failure states, and structural responses (displacement and support reaction force). And keeping the total TNT charge mass of 1 kg unchanged, the effect of loading numbers was investigated by loading two 0.5 kg TNT successively and a single 1 kg TNT on RC beams, respectively. Besides, the successive loading of two different explosions was also considered by investigating the effects of loading sequences and the first explosion induced pre‐damage on the ultimate accumulated damage of RC beams. At last, based on the reaction force and displacement responses, a nonlinear relationship between the dynamic residual load‐carrying capacity and the accumulated residual displacement was obtained to assess the damage states of the tested beams. The results show that the local failure range along the beam span direction (length of peeling‐off and length of spallation) caused by the first blast load did not apparently increase when the damaged beams were subjected to another blast load. With the increase in explosion numbers, depth of compressive crushing increases gradually. At the same stand‐off distance (from 0.25 to 0.45 m), due to the damage accumulation effect, successive loading of two 0.5 kg TNT can trigger more severe local failure but smaller accumulated residual deflection to beams than the single loading of a 1 kg TNT. Besides, when two different blast loads are loaded on tested beams, the loading sequence of the larger one first and then the smaller one (1 kg TNT/0.5 kg TNT at h = 0.45 m) can trigger larger damage to beams than the opposite loading sequence (0.5 kg TNT/1 kg TNT at h = 0.45 m). And for the beams subjected to a smaller blast load first and then a larger one, a stiffer behavior may be triggered by the second blast load on the beam after the first loading of the smaller blast load due to the residual strain in longitudinal reinforcement. Furthermore, based on the nonlinear relationship between residual load‐carrying capacity and residual displacement, the accumulated damage of RC beams was divided into mainly four phases.

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Section: Methodsmentioning

confidence: 99%

Section: Specimen Descriptionmentioning

confidence: 99%

Effect of load details of the successive explosions on the blast behaviors of reinforced concrete beams

Xu,

Liu,

Huang

et al. 2023

Structural Design Tall Build

Self Cite

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Numerical analysis of the local damage of RC beams under close‐in explosions based on the calibrated Karagozian & Case (K&C) concrete model

Xu,

Liu,

Huang

et al. 2024

Structural Concrete

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Limited research has been carried out to investigate the local damage features of reinforced concrete (RC) beams under close‐in explosions. To better capture the local damage features of rectangular cross‐sectional RC beams, a numerical study on the RC beams subjected to close‐in explosions based on the calibrated Karagozian & Case (K&C) concrete model was conducted in LSDYNA. First, a systematic calibration of the K&C model for concrete was performed in the single‐element numerical analysis. Calibration of the K&C model consists of parameter determination for the new strength surfaces, modification of the damage function to better feature the tensile behavior of concrete, elimination of the element size effect by introducing an element size factor and determination of the scaled damage factors. The new strength surfaces are verified and determined through both the approximation calculation method and the parameter fitting method. And the damage function was modified by reducing the termination of λ to better characterize the brittleness of concrete and feature the tensile failure. A comparison between the numerical results and the corresponding experimental results demonstrates that the calibrated K&C model and established FEM model of RC beams subjected to close‐in explosions can well characterize the local damage features of RC beams. On this basis, a further parameter analysis on the factors influencing the local damage response of RC beams was conducted by considering reinforcement details (stirrup spacing and longitudinal reinforcement diameter) and charge details (charge mass and aspect ratio). Results show that the close‐in explosions destroyed the concrete corners in the blast surface with shear stress first and the side shear failure of concrete corners weakens the concrete core strength and contributes to the greater loss of concrete core. Rear spalling damage was initially caused by the bond failure between the tensile longitudinal reinforcement and the surrounding concrete. Furthermore, increasing stirrup spacing, tensile longitudinal reinforcement diameter, and charge mass contribute to the increase in local damage sizes.

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Nonlinear transient response of magneto-electro-elastic cylindrical shells with initial geometric imperfection

Gan,

She

2024

Applied Mathematical Modelling

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Dynamic response of GFRP-reinforced UHPC beams under close-in blast loading

Cited by 13 publications

References 46 publications

Effect of load details of the successive explosions on the blast behaviors of reinforced concrete beams

Effect of load details of the successive explosions on the blast behaviors of reinforced concrete beams

Numerical analysis of the local damage of RC beams under close‐in explosions based on the calibrated Karagozian & Case (K&C) concrete model

Nonlinear transient response of magneto-electro-elastic cylindrical shells with initial geometric imperfection

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