Numerical determination of reflected blast pressure distribution on round columns

Qasrawi, Yazan; Heffernan, P. J.; Fam, A.

doi:10.2495/978-1-84564-750-6/04

Cited by 1 publication

(3 citation statements)

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“…In a study by Williams and Williamson (2012), a procedure for predicting blast loads acting on bridge columns accounting for shape factors is presented. In works by Qasrawi et al (2012) and Qasrawi et al (2015), simulations with AUTODYN for the determination of equivalent reflected blast parameters acting on circular cross-sections are presented. In a study by Sembian et al (2016), experimental and numerical results of the interaction of a plane shock wave interaction with a cylindrical water column are presented.…”

Section: Literature Reviewmentioning

confidence: 99%

“…There is little literature known to authors, which contains numerical and/or experimental data about this topic. For validation purpose, some literature compares numerical results of the reflected pressure and impulse, which is measured at the front of the cylinder (column), with empirical values of the design code (UFC:3-340-2:2008, 2008) calculated for a rigid plane wall (see Qasrawi et al, 2012Qasrawi et al, , 2015. In some other literature, validation is carried out by comparing Schlieren photos of experimental tests with the numerically assessed shock wave profile.…”

Section: Pressure Distribution Over Cylindermentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

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Peak overpressure and impulse due to diffraction over a cylinder and/or multi-reflection of a shock wave in structural design- Part I

Hahn

Mensinger

Rutner

2020

International Journal of Protective Structures

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The design and planning of structural components, such as columns, to resist blast loads is a complex task. Often standard free-field blast loads, specified in design codes or other literature, are used for the analysis of the object. These loads are then further increased or decreased depending on the topology of the surrounding geometry (Mach-Stem), the shape of the impacted object itself, and blast wave reflection. However, most of these research works focus purely on the assessment of the structural components itself, ignoring a complex fluid mechanics phenomenon such as diffraction, which is of particular interest when circular columns are standing next to each other or placed in front of a façade. The article addresses three main topics. First, the article answers the question whether the area behind the column is protected, meaning constituting a shadowed area. We present findings that the close area behind a column is subjected to higher pressure and impulse values as there would be without the column. Hence, the incident pressure sees significant pressure buildup due to diffraction. This pressure buildup is quantified using pressure increase factors and presented together with the accompanying impulse. Second, this pressure buildup is of relevance for realistic design of a façade behind the column, which is not covered in current design codes at all. We discuss relevant parameters in the design process. Third, directly coupled with the assessment of the pressure buildup behind the column due to diffraction is the assessment of pressure and impulse in the area behind the column due to multi-wave reflection at a façade, leading to a significant pressure and impulse scale-up, which might be relevant for design of a column and/or a façade. This article identifies gaps in understanding diffraction and subsequent multi-reflection of blast wave within a structural design framework and provides insights on how to establish safe design accounting for these effects.

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