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

Long-duration blast loading & response of steel column sections at different angles of incidence
Long-duration blast loading & response of steel column sections at different angles of incidence
This paper reports experimental results pertaining to the effects of planar long-duration blast waves interacting with steel I-section column elements about different angles of incidence. Long-duration blast waves are typically defined by a positive pressure phase duration in excess of 100ms, characteristic of very large explosion events such as industrial accidents. Blasts of this magnitude result in large impulses and dynamic pressures with the potential to exert high drag forces on column elements within an open frame structure. Due to relatively small dimensions in comparison to the long-duration blast wavelength, individual column elements are predominantly subjected to translational drag loading. Blast drag loading is complex to characterise, generally requiring approximation using drag coefficients, although proposed values in literature display inconsistency and typically lack provision for multi-axis interaction with I-shape geometries. Four full-scale long-duration experiments investigated blast interaction and elastic structural response of two steel I-section columns as a function of orientation to the incident shock wave. Drag coefficients were calculated as a function of I-section orientation using experimental pressure data and compared to values proposed in literature. It was found that drag coefficients proposed in literature have the potential to under-predict drag loading for certain oblique I-section orientations examined in these experiments. Importantly, intermediate oblique I-section orientations recorded higher loading and exhibited higher drag coefficients compared to orthogonal orientations, resulting in larger structural elastic response. Results from this experimental work have confirmed that I-section columns are axis-sensitive to blast wave direction giving rise to varying magnitudes of drag loading and structural response.
0141-0296
331-342
Denny, Jack
7bd3e650-6c4e-4149-b408-2166e377b216
Clubley, Simon
a85faf5a-8f3e-49b1-be58-1be0c02e8e42
Denny, Jack
7bd3e650-6c4e-4149-b408-2166e377b216
Clubley, Simon
a85faf5a-8f3e-49b1-be58-1be0c02e8e42

Denny, Jack and Clubley, Simon (2019) Long-duration blast loading & response of steel column sections at different angles of incidence. Engineering Structures, 178, 331-342. (doi:10.1016/j.engstruct.2018.10.019).

Record type: Article

Abstract

This paper reports experimental results pertaining to the effects of planar long-duration blast waves interacting with steel I-section column elements about different angles of incidence. Long-duration blast waves are typically defined by a positive pressure phase duration in excess of 100ms, characteristic of very large explosion events such as industrial accidents. Blasts of this magnitude result in large impulses and dynamic pressures with the potential to exert high drag forces on column elements within an open frame structure. Due to relatively small dimensions in comparison to the long-duration blast wavelength, individual column elements are predominantly subjected to translational drag loading. Blast drag loading is complex to characterise, generally requiring approximation using drag coefficients, although proposed values in literature display inconsistency and typically lack provision for multi-axis interaction with I-shape geometries. Four full-scale long-duration experiments investigated blast interaction and elastic structural response of two steel I-section columns as a function of orientation to the incident shock wave. Drag coefficients were calculated as a function of I-section orientation using experimental pressure data and compared to values proposed in literature. It was found that drag coefficients proposed in literature have the potential to under-predict drag loading for certain oblique I-section orientations examined in these experiments. Importantly, intermediate oblique I-section orientations recorded higher loading and exhibited higher drag coefficients compared to orthogonal orientations, resulting in larger structural elastic response. Results from this experimental work have confirmed that I-section columns are axis-sensitive to blast wave direction giving rise to varying magnitudes of drag loading and structural response.

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More information

Accepted/In Press date: 8 October 2018
e-pub ahead of print date: 25 October 2018
Published date: 1 January 2019

Identifiers

Local EPrints ID: 425665
URI: https://eprints.soton.ac.uk/id/eprint/425665
ISSN: 0141-0296
PURE UUID: 8466daaf-027c-4cc0-9cf5-fe410681c263
ORCID for Jack Denny: ORCID iD orcid.org/0000-0003-3181-4747

Catalogue record

Date deposited: 31 Oct 2018 17:30
Last modified: 14 Mar 2019 01:22

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