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Damage propagation in reinforced concrete frames under external blast loading

Jayasooriya, Ruwan, Thambiratnam, David, Perera, Nimal, & Kosse, Vladis (2009) Damage propagation in reinforced concrete frames under external blast loading. In 4th International Conference on Protection of Structures Against Hazards, 23–25 October 2009, Hotel Unisplendour Centre, Beijing. (Unpublished)

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Abstract

Iconic and significant buildings are the common target of bombings by terrorists causing large numbers of casualties and extensive property damage. Recent incidents were external bomb attacks on multi-storey buildings with reinforced concrete frames. Under a blast load circumstance, crucial damage initiates at low level storeys in a building and may then lead to a progressive collapse of whole or part of the structure. It is therefore important to identify the critical initial influence regions along the height, width and depth of the building exposed to blast effects and the structure response in order to assess the vulnerability of the structure to disproportionate and progressive collapse.

This paper discusses the blast response and the propagation of its effects on a two dimensional reinforced concrete (RC) frame, designed to withstand normal gravity loads. The explicit finite element code, LS DYNA is used for the analysis. A complete RC portal frame seven storeys by six bays is modelled with reinforcement details and appropriate materials to simulate strain rate effects. Explosion loads derived from standard manuals are applied as idealized triangular pressures on the column faces of the numerical models.

The analysis reports the influence of blast propagation as displacements and material yielding of the structural elements in the RC frame. The effected regions are identified and classified according to the load cases. This information can be used to determine the vulnerability of multi-storey RC buildings to various external explosion scenarios and designing buildings to resist blast loads.

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ID Code: 27093
Item Type: Conference Paper
Keywords: Blast analysis, Progressive collapse, LS DYNA modelling, Influence region, Finite element analysis, Reinforced concrete frames, Damage propagation, Disproportionate collapse
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Structural Engineering (090506)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Institutes > Information Security Institute
Past > Schools > School of Engineering Systems
Past > Schools > School of Urban Development
Copyright Owner: Copyright 2009 [please consult the author]
Deposited On: 29 Sep 2009 08:46
Last Modified: 29 Feb 2012 23:59

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