Long-duration blast loading &amp; response of steel column sections at different angles of incidence

Extensive research focus had been given to sacrificial sandwich panels to mitigate the effects of blast loads. This is due to their ability to distribute the load and absorb a significant portion of the blast energy. This paper studies the behavior of sacrificial sandwich mild steel panels of axially oriented octagonal tapered tubular cores subjected to near-field impulsive blast. The deformation behavior and several assessment parameters consisting of the peak force, stroke efficiency, energy absorption and core efficiency were investigated using validated finite element analysis. The developed deformation modes were mainly influenced by the top plate and tube thickness. Tubes of a 5° taper performed unfavorably, exhibiting increased peak force and lower energy absorption. Panels of top plate thickness of 4 mm exhibited higher stroke efficiency as compared to panels of lower thickness. The top plate and tube thickness significantly affected energy absorption. An increase of 73.5% in core efficiency was observed in thick-plate panels as compared to thin-plate ones.

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“…Clubley [3] conducted full-scale experiments on I-beam steel columns to mimic real explosion events, such as in industrial accidents.…”

Section: Of 18mentioning

confidence: 99%

Study of Mild Steel Sandwich Structure Energy Absorption Performance Subjected to Localized Impulsive Loading

2020

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“…Long-duration blast waves are typically defined by positive pressure durations over 100 ms, developing in later stages of shock wave propagation i.e. in the 'far field' from the source of detonation (Denny & Clubley, 2019;Johns & Clubley, 2016). Blast waves reaching this later stage of propagation with sufficient energy to cause structural damage are characteristic of large-scale explosive events.…”

Section: Introductionmentioning

confidence: 99%

“…When long-duration blasts interact with comparatively slender structural elements such as individual columns, the diffraction loading phase is reduced to a shortduration spike of reflected pressure as the blast envelops the column, followed by loading due to flow of the displaced air i.e. drag loading (Denny, 2017;Denny & Clubley, 2019). This is due to rapid equalisation of blast overpressures associated with the small section dimensions in comparison to blast wavelength (Denny, 2017;Denny & Clubley, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…drag loading (Denny, 2017;Denny & Clubley, 2019). This is due to rapid equalisation of blast overpressures associated with the small section dimensions in comparison to blast wavelength (Denny, 2017;Denny & Clubley, 2019). Column elements are therefore 'drag-sensitive' where translational drag loading resulting from dynamic pressures has a predominant effect.…”

Section: Introductionmentioning

confidence: 99%

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Evaluating long-duration blast loads on steel columns using computational fluid dynamics

Denny

Clubley

2019

Structure and Infrastructure Engineering

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Long-duration blasts are typically defined by positive pressure durations exceeding 100 ms. Such blasts can generate dynamic pressures (blast winds) capable of exerting damaging drag loads on comparatively slender structural components such as columns. With limited drag coefficient availability for specific structural geometries, Computational Fluid Dynamics (CFD) can be the only satisfactory approach for analysing blast loading on user-specified, finite geometries. The ability to analyse long-duration blasts with commercially available CFD programmes is still not confidently offered, with no prior studies examining the accuracy of modelling interaction with relatively much smaller, finite geometries. This paper presents a comparative investigation between numerical and experimental results to assess the predictive capacity of inviscid Eulerian CFD as a method for calculating long-duration blast drag loading on finite cross-sectional geometries. Full-scale long-duration blast experiments successfully measured surface pressure-time histories on a steel I-section column aligned at four orientations. Calculated pressure-time histories on exposed geometry surfaces demonstrated good agreement although reduced accuracy and under-prediction occurred on shielded surfaces manifesting as overestimated net loading. This study provides new understanding and awareness of the numerical capability and limitations of using CFD to calculate long-duration blast loads on intricate geometries.

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“…The adiabatic localization's of intense plastic strains and heats were investigated throughout the flange width, flange length, web depth, and web length. Denny et al [9] experimentally analyzed the response of the steel H-section column, for long-duration and long-range explosive loading. A series of experiments were done under different rotation angles of the obstacle.…”

Section: Introductionmentioning

confidence: 99%

Close Range Explosive Loading on Steel Column in the Framework of Anisotropic Viscoplasticity

Sielicki

Sumelka

Łodygowski

2019

Metals

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The research was based on data obtained from experimental studies and aims in thechallenge of mapping these results by a mathematical (phenomenological) model. The fieldexperiments were performed on an H-section steel column supported by a reinforced concretefoundation and subjected to a close-in explosion. Numerical studies were carried out usingAbaqus/Explicit code. The user subroutine VUMAT for metallic obstacle was also implemented,together with a coupled Eulerian–Lagrangian approach. The steel column failure recorded duringreal field tests versus computational results was examined and compared. It was crucial that, fromthe computational point of view, the obstacle reflected the generalized thermo-elasto-viscoplastic(GTEV) behavior of Perzyna’s type, including an anisotropic measure of damage.

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Long-duration blast loading & response of steel column sections at different angles of incidence

Cited by 20 publications

References 10 publications

Study of Mild Steel Sandwich Structure Energy Absorption Performance Subjected to Localized Impulsive Loading

Study of Mild Steel Sandwich Structure Energy Absorption Performance Subjected to Localized Impulsive Loading

Evaluating long-duration blast loads on steel columns using computational fluid dynamics

Close Range Explosive Loading on Steel Column in the Framework of Anisotropic Viscoplasticity

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