Blast resistance of single steel‐concrete composite slabs under contact explosion

Zhao, Chunfeng; Chen, Yingjie; Jin, Qiang; Wang, Jingfeng; Li, Xiaojie

doi:10.1002/suco.202200542

Cited by 3 publications

(1 citation statement)

References 39 publications

(69 reference statements)

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“…Gan et al 7 and Yao et al 8 have investigated the explosive performance, failure mode, and damage mechanism of steel box girders and proposed a fast prediction equation of steel box girder failure mode under the action of internal explosion load. Zhao et al 9 studied the blast performance of the scale single‐steel–concrete (SSC) specimens under a contact explosion. The damage modes, deflections, and acceleration response of the SSC specimens were obtained and compared.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on protection of prestressed concrete box girder under vehicle explosion of bridge deck

Sun,

Liu

2024

Structural Concrete

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This paper presents a study on the explosion protection of prestressed concrete box girder, which is a commonly used in concrete bridges. The explosion protection tests of four prestressed box beams were designed with 1:5 scale. In order to evaluate the explosion performance of different protective layers, steel plate, ultra‐high‐performance concrete (UHPC) layer, and composite protective layer were used to protect the box girder. The experimental results revealed that under the effect of deck explosion, local penetrating failure occurred in the top plate of the box girder, which exhibited characteristics of punching failure. The web and bottom plate of the box girder as a whole exhibited bending characteristic. Compared with the unprotected box girder, the damage of the top plate of the protected box girder was less severe, whereas the damage of the bottom plate was greater. In working conditions 2–4, the UHPC protective box girder suffered less damage to the top plate, whereas the other protective box girders suffered more. The explosion dynamic responses of the box girder were compared, and the influences of different protective layers on the explosion dynamic response of box girder were studied. Based on the box girder damage, the protective efficiency of each protective layer under near‐explosion was studied. Based on the explosion tests, three‐dimensional numerical analysis model of box girder explosion was established. The accuracy of the numerical simulations of the box girder explosion were verified by comparing with the experimental failure data. Through the numerical results, the explosive energy dissipation capacity of different protective materials was compared and analyzed. Finally, based on the dynamic response of the box girder under different working conditions, the sensitivity of the protective layer to the dynamic responses of the box girder were studied. The analysis showed that the UHPC layer was sensitive to the change of prestress and explosion damage area of the box girder but had little influence on the rebars stress and the overall response of the box girder.

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Section: Introductionmentioning

confidence: 99%

Experimental study on protection of prestressed concrete box girder under vehicle explosion of bridge deck

Sun,

Liu

2024

Structural Concrete

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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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Experimental and numerical study on the blast performance of the corrugated double steel plate concrete composite wallboard under blast loads

Zhao,

Zhang,

et al. 2024

Thin-Walled Structures

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Blast resistance of single steel‐concrete composite slabs under contact explosion

Cited by 3 publications

References 39 publications

Experimental study on protection of prestressed concrete box girder under vehicle explosion of bridge deck

Experimental study on protection of prestressed concrete box girder under vehicle explosion of bridge deck

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

Experimental and numerical study on the blast performance of the corrugated double steel plate concrete composite wallboard under blast loads

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