Numerical Simulations of Blast Loads from Near-Field Ground Explosions in Air

Dobrociński, S.; Flis, L.

doi:10.1515/sgem-2015-0040

Cited by 13 publications

(3 citation statements)

References 6 publications

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“…The TNT explosives utilize the high explosive combustion material model keyword *MAT_HIGH_EXPLOSIVE_BURN within the LS‐DYNA material library, combined with the EOS_ JWL state function equation. References Hallquist 34 and Dobrociński and Flis 35 are used to define the explosive material parameters. The air is simulated using the *MAT_NULL keyword model, combined with a linear polynomial state function 34 .…”

Section: Numerical Simulation Analysismentioning

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: Numerical Simulation Analysismentioning

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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“…Three models were created for the studied RC column SEIS-8 with different erosion values 0.025, 0.05 and 0.10, using the mesh sizing 15×15×18.75 mm. The flow stress is assigned using Von Mises stress as expressed by Johnson-Cook (J-C) [46]. Figure 16 shows the failure mode shapes corresponding to the three erosion values; the maximum displacement values are plotted in Figure 17 compared to the experimental value.…”

Section: Effect Of Erosion Valuesmentioning

confidence: 99%

Effect of Blast Loading on Seismically Detailed RC Columns and Buildings

et al. 2021

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Explosions caused by standoff charges near buildings have drastic effects on the internal and external structural elements which can cause loss of life and fatal injuries in case of failure or collapse of the structural element. Providing structural elements with blast resistance is therefore gaining increasing importance. This paper presents numerical investigation of RC columns with different reinforcement detailing subjected to near-field explosions. Detailed finite element models are made using LS-DYNA software package for several columns having seismic and conventional reinforcement detailing which were previously tested under blast loads. The numerical results show agreement with the published experimental results regarding displacements and damage pattern. Seismic detailing of columns enhances the failure shape of the column and decrease the displacement values compared to columns with conventional reinforcement detailing. Further, the effect of several modeling parameters are studied such as mesh sensitivity analysis, inclusion of air medium and erosion values on the displacements and damage pattern. The results show that decreasing the mesh size, increasing erosion value and inclusion of air region provide results that are very close to experimental results. Additionally, application is made on a slab-column multistory building provided with protective walls having different connection details subjected to blast loads. The results of this study are presented and discussed. Use of a top and bottom floor slab connection of protective RC walls are better than using the full connection at the four sides to the adjacent columns and slabs. This leads to minimizing the distortion and failure of column, and therefore it increases the chance of saving the building from collapse and saving human lives. Doi: 10.28991/cej-2021-03091733 Full Text: PDF

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“…It was concluded that the coupled MM-ALE method is useful in cases where the scaled distance is above 0.4, the problems that may arise from large air elements can be compensated by increasing the air density up to a certain rate, and larger air elements can be used in simulations where the scaled distance is relatively large (Han and Liu, 2015). Flis and Dobrociński, simulated hemispherical detonation waves on 1 kg of TNT detonated on a 1m x 1m steel plate on the ground plane with the numerical methods CONWEP, MM-ALE and SPH and concluded that the MMALE method is the only method that gives approximate results in contact explosions (Flis and Dobrociński, 2015). They observed that the CONWEP method could not generate detonation waves in the correct form in explosions that were closer than three times the charge radius and when the scaled distance was about 1 𝑚 𝑘𝑔 3 1 ⁄…”

Section: Introductionmentioning

confidence: 99%

LS Dyna ile Serbest Hava Ortamındaki Patlama Yükünün Sayısal Simülasyonu için SPH, ALE, Birleştirilmiş ALE-LBE ve CONWEP Yöntemlerinin İncelenmesi

SAVRUKOĞLU

Aslantaş

2023

Journal of Materials and Mechatronics: A

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Different simulation methods can be used to model the response of structures to the effects of blast loading. While some simulation methods are based on empirical blast loading principles, other methods use a fluid structure interaction algorithm to predict post-explosion shock waves and their physical effects. In this study, CONWEP, SPH, ALE, and coupled MM-ALE with LBE numerical methods were compared against each other according to results from an experimental study. Each method was compared with the test results in terms of solution time, convergence, and the use for different explosive types and environments. According to this comparison, it was concluded that empirical methods can be used for more limited environmental conditions and blast types, ALE numerical methods can give very sensitive results even in different solution sets but the solution time is long. Meanwhile in SPH method, the interaction of the air and blast shock cannot be fully modelled. According to the results of the study, the hybrid method is consistent with the test results in terms of peak pressure with a deviation of 7.44% at P1 and 2.29% at P2 under spherical free air blast loading conditions. However, since the effects of reflected pressure cannot be modelled exactly in the hybrid method, the ALE method should be preferred in cases with more complex geometries.

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Numerical Simulations of Blast Loads from Near-Field Ground Explosions in Air

Cited by 13 publications

References 6 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

Effect of Blast Loading on Seismically Detailed RC Columns and Buildings

LS Dyna ile Serbest Hava Ortamındaki Patlama Yükünün Sayısal Simülasyonu için SPH, ALE, Birleştirilmiş ALE-LBE ve CONWEP Yöntemlerinin İncelenmesi

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