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Investigating the scaling of masonry structures in a blast environment

Investigating the scaling of masonry structures in a blast environment
Investigating the scaling of masonry structures in a blast environment

Full-scale experimental testing of masonry response to blast can be challenging with the requisite need for significant measurement area in conjunction with high construction and material costs. This paper investigates the use of dynamic similitude to produce reduced-scale masonry structures which model the damage state and debris distribution of a full-scale counterpart due to blast loading. An investigation into the fundamental physical components of masonry response to blast loading facilitated the development of a new scaling methodology which maintains the ratio of lateral and vertical force components as prescribed by dynamic similitude. It is shown that this can be accomplished by using a reciprocal scale factor for the reduced-scale structure's density. Computational models of full and reduced-scale masonry response to blast loading were produced with the Applied Element Method (AEM) to verify the underlying theory of the proposed scaling methodology. These utilised single-storey cuboid structures with non-responding roofs and half-thickness stretcher bond construction. Computational Fluid Dynamics (CFD) models of blast wave interaction with the masonry structures were defined at a range of peak overpressures, enabling a remap procedure into AEM. Importantly, AEM models utilised a constant 1:2 scale factor with masonry material parameters for commercially available units, demonstrating the practical applications of this scaling methodology for blast trials. Analysis of the AEM models demonstrated close qualitative agreement in damage state for full and reduced-scale structures at 55 kPa and 110 kPa peak free-field overpressure. These results also indicated agreement for a range of failure modes with the 110 kPa model showing front-panel collapse versus the 55 kPa model which indicated partial front-panel deflection. Chi-square analysis of the resultant debris distribution at 110 kPa indicated quantitative agreement for the relative quantities of bricks found within the rubble pile as a function of their original panel wall location.

Blast, Damage, Dynamic similitude, Masonry, Rubble, Scaling, Structures
0141-0296
Johns, Robert V.
e656156c-82ba-4d80-8be2-e7c168c34462
Clubley, Simon K.
d3217801-61eb-480d-a6a7-5873b5f6f0fd
Johns, Robert V.
e656156c-82ba-4d80-8be2-e7c168c34462
Clubley, Simon K.
d3217801-61eb-480d-a6a7-5873b5f6f0fd

Johns, Robert V. and Clubley, Simon K. (2019) Investigating the scaling of masonry structures in a blast environment. Engineering Structures, 201, [109727]. (doi:10.1016/j.engstruct.2019.109727).

Record type: Article

Abstract

Full-scale experimental testing of masonry response to blast can be challenging with the requisite need for significant measurement area in conjunction with high construction and material costs. This paper investigates the use of dynamic similitude to produce reduced-scale masonry structures which model the damage state and debris distribution of a full-scale counterpart due to blast loading. An investigation into the fundamental physical components of masonry response to blast loading facilitated the development of a new scaling methodology which maintains the ratio of lateral and vertical force components as prescribed by dynamic similitude. It is shown that this can be accomplished by using a reciprocal scale factor for the reduced-scale structure's density. Computational models of full and reduced-scale masonry response to blast loading were produced with the Applied Element Method (AEM) to verify the underlying theory of the proposed scaling methodology. These utilised single-storey cuboid structures with non-responding roofs and half-thickness stretcher bond construction. Computational Fluid Dynamics (CFD) models of blast wave interaction with the masonry structures were defined at a range of peak overpressures, enabling a remap procedure into AEM. Importantly, AEM models utilised a constant 1:2 scale factor with masonry material parameters for commercially available units, demonstrating the practical applications of this scaling methodology for blast trials. Analysis of the AEM models demonstrated close qualitative agreement in damage state for full and reduced-scale structures at 55 kPa and 110 kPa peak free-field overpressure. These results also indicated agreement for a range of failure modes with the 110 kPa model showing front-panel collapse versus the 55 kPa model which indicated partial front-panel deflection. Chi-square analysis of the resultant debris distribution at 110 kPa indicated quantitative agreement for the relative quantities of bricks found within the rubble pile as a function of their original panel wall location.

Full text not available from this repository.

More information

Accepted/In Press date: 30 September 2019
e-pub ahead of print date: 15 October 2019
Published date: 15 December 2019
Keywords: Blast, Damage, Dynamic similitude, Masonry, Rubble, Scaling, Structures

Identifiers

Local EPrints ID: 437145
URI: http://eprints.soton.ac.uk/id/eprint/437145
ISSN: 0141-0296
PURE UUID: 3438e525-4fe1-4aeb-9f72-9702ccb05ef4
ORCID for Simon K. Clubley: ORCID iD orcid.org/0000-0003-3779-242X

Catalogue record

Date deposited: 17 Jan 2020 17:36
Last modified: 18 Feb 2021 17:17

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