Welcome  to  the HOT  TOPIC in  Architectural  Surety  # 3A !
FLYING DEBRIS / TERRORIST BLAST PROTECTIVE DISPENSABLE STRUCTURAL SHIELD
        It was widely believed until recently that a building subject to an explosive attack had a chance to remain standing only if it possessed some extraordinary resistive capacity.  This belief rested on the assumption that the specific impulse or the time integral of pressure, which is a dominant characteristic of the external blast load, is fully beyond our control. Fortunately, the last statement is just half-true. 
        We, actually, cannot control a magnitude of a load itself but we can influence a timing of its application to structural elements as well as a pattern of interaction of those elements, which was engaged in Blast Protective Structural System described in Topic 3 . However, there is a more effective way to shield internal premises of the building against air blast effects. The method is based on the concept of energy consumption, which means a temporary storage plus dissipation and dispersion, of window glass debris' kinematical energy with the help of a protective dispensable system called  Sails-Rigging Blast Protective Shield or, in short, BPS.
     BPS includes sails, pilasters and riggings. Each sail consists of a vertical protective layer of a flexible and, 
at least partially, transparent fabric stretched internally parallel to windows between the external wall pilasters and running from the top of protected floors level of the building to its foundation. The pilasters divide external walls into the separate window protective sections. 
        The riggings are vertical and horizontal. The vertical riggings consist of array of parallel ropes, cables or rods supporting the sail membrane against the impact of glass debris. They represent tension components of the rigging system. Floor diaphragms or horizontal riggings are compression components of the system.
         The primary objective of  BPS  is to dissipate the kinetic energy of the flying glass debris through the mechanism of plastic deformation in the tension components while transferring the rest of the blast energy to the whole building structure through the compression components of high resistive capacity in the range of elastic deformations. The dispensable elements of  BPS  were recently tested at CSUN*,**.
 * Shustov, V. , 2001, “Testing Components for Blast Debris Protection”, Research report for Karagozian & Case Structural Engineers, Volumes 1 - 2, CSUN, Northridge, CA.
 ** Shustov, V. , 2001, http://www.seaint.org/seaocconvention/convention1999/Proceedings/BP_Shield.pdf
, “Sail-Rigging Blast Protective Structural Shield”, CSUN, Northridge, CA.
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     This page was last updated on 06/01/01
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