Numerical Determination Of Reflected Blast
Pressure Distribution On Round Columns
Author(s)
Y. Qasrawi, P. J. Heffernan & A. Fam
Abstract
Blast load parameters are reasonably easily determined for rectangular columns
and can be derived from either the literature or numerous utility programs. Little
compiled information is available with respect to exposed round columns. A
series of numerical simulations were carried out to investigate the design
pressure imparted to a round column by an explosion. The column diameter and
charge weight were varied and pressure-time histories recorded at regular radial
intervals along the face of the column from the closest point of first contact
(front) to the extreme point at the side. A numerical model was created in
AUTODYN, which simulated a blast wave diffracting around a rigid round cross
section. The results indicate that as the diameter of the section increases, the
peak reflected pressure at the point of first contact rapidly approaches that of a
flat wall. However, the pressure varies sinusoidally between this peak at the
point of first contact to a minimum equal to approximately the incident pressure
at the furthest point at the side. The results support the obvious advantages when
designing against blast to be realized by the use of round vs. rectangular
columns, particularly when in the near field.
Keywords: AUTODYN, numerical modelling, round column, reflected pressure,
pressure distribution.
1 Introduction
Fujikura et al. [1] have shown experimentally that the reflected over pressure
experienced by a round column is substantially lower than the indicated design
values. This fact and the intuitive expectation that round columns would deflect
Keywords
AUTODYN, numerical modelling, round column, reflected pressure,
pressure distribution
Related Book
Other papers in this volume
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