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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 99
PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY
Edited by: B.H.V. Topping
Paper 274

The Collapse of a Skylight Shell Structure caused by a Blast

A. Angotzi1, A. Mussi1, E. Trolese2, M. Zanchin2, R. Gori3 and A. Mastropasqua3

1Arup Italy srl, Milan, Italy
2Mastropasqua-Zanchin & Associates Structural Engineering, Treviso-Udine, Italy
3Department of Civil, Environmental and Architectural Engineering (DCEAE), Padua University, Italy

Full Bibliographic Reference for this paper
A. Angotzi, A. Mussi, E. Trolese, M. Zanchin, R. Gori, A. Mastropasqua, "The Collapse of a Skylight Shell Structure caused by a Blast", in B.H.V. Topping, (Editor), "Proceedings of the Eleventh International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 274, 2012. doi:10.4203/ccp.99.274
Keywords: non-linear numerical analyses, blast event, steel structures, skylight system.

Summary
Following the failures caused by explosions, that in recent years have involved both civil and military buildings, the dimensioning of structures subjected to blast forces and the verification of the resistance to failure of one or more structural elements have become of utmost importance during the design phase.

This paper therefore evaluates suitable considerations, with reference to a specific structural system currently under construction; the system, a skylight shell structure designed by means of glass envelope and structural steel members, has the dimensions of 52.50 m and 40.00 m respectively for the maximum and minimum geometrical axis, and a span ratio of 6.75%. For assessing design criteria, several blast-wave signals were obtained, for the detonation effects, in terms of peak reflected pressure, shockwave arrival time, duration of the positive phase, duration of the negative phase, and negative peak reflected pressure. These were determined assuming, conventionally, a direct pressure relationship using the polynomial equations of Kingery and Bulmash [1], which form the basis of the US manual TM5-1300 [2]. This assumption was enabled using the job technical specifications which considered the distance between the detonation point and the glass system, therefore ignoring the side-wall reflection effects. The non-linear time-history responses of the system were investigated by means of a finite element model, highlighting some valid indications of the hypotheses of the possible locations of plastic mechanisms which were responsible for the progressive structural failure. Furthermore, some indications of the damping response of the material and structural connections were obtained, following a comparison between a hypothetical non-linear elastic behaviour (with no energy dissipation) of the material and the realistic non-linear elastic-plastic response (with energy dissipation).

References
1
C.N. Kingery, G. Bulmash, "Airblast Parameters from TNT Spherical Air Burst and Hemispherical Surface Burst", ARBRL-TR-02555, Ballistic Research Laboratory, Aberdeen Proving Ground, MD, 1984.
2
Army TM-5-1300, Navi Navfac P-397, Air Force AFR 88-22, "Structures To Resist The Effects Of Accidental Explosions", 1990.

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