Residual Performance of Reinforced Concrete Beams Damaged by Low-Velocity Impact Loading

Yu, Yongjae; Lee, Sangho; Ahn, Hyukjun; Cho, Jae-Yeol

doi:10.1061/jsendh.steng-11697

Cited by 6 publications

(3 citation statements)

References 18 publications

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“…Besides, it can be observed from Figure 21 that in Phase I, a small residual displacement corresponds to an almost unchanged load‐carrying capacity of 93.5 kN. Similar results can be found in the research of Yu et al 34 Therefore, the value of 93.5 kN was considered the maximum load‐carrying capacity L max . Based on this, the relationship between L res and

Δ_{res}

was normalized as the relationship between L res / L max and

2 Δ_{res} / l

.…”

Section: Resultssupporting

confidence: 77%

“…The potential reason can be attributed to the residual strain on the reinforcement in beams during the first explosions. According to the research of Yu et al, 34 the residual displacement of tested beams indicates the generation of residual strain in the longitudinal bars near the center of the beams. As shown in Figure 12, if the residual strain in the longitudinal bars after the first explosion is larger than the strain required for strain hardening, a strain hardening effect in the reinforcement will be further amplified by the second identical blast load, causing a smaller or similar displacement response and more evident rebound phenomena in the beam.…”

Section: Resultsmentioning

confidence: 99%

“…Behavior of rebar during successive explosions. 34 Reaction force /kN F I G U R E 1 3 Comparisons of support reaction: effect of charge mass at the scaled distance of 0.567 m/kg 1/3 .…”

Section: Effect Of Loading Numbersmentioning

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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Δ_{res}

was normalized as the relationship between L res / L max and

2 Δ_{res} / l

.…”

Section: Resultssupporting

confidence: 77%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard 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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Impact response of RC beams strengthened with ultra-rapid-hardening strain-hardening cementitious composites

Chun,

Lee,

et al. 2024

Construction and Building Materials

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Residual Performance of Reinforced Concrete Beams Damaged by Low-Velocity Impact Loading

Cited by 6 publications

References 18 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

Impact response of RC beams strengthened with ultra-rapid-hardening strain-hardening cementitious composites

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