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Progressive collapse resisting mechanisms of reinforced concrete structures

Alogla, KD, Weekes, L and Augusthus Nelson, L 2016, Progressive collapse resisting mechanisms of reinforced concrete structures , in: New Trends on Integrity, Reliability and Failure, 24-28 July 2016, Porto/Portugal.

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Abstract

Reinforced concrete (RC) buildings may be vulnerable to progressive collapse due to lack of sufficient continuous reinforcement. Progressive collapse is a situation when local failure is followed by collapse of adjoining members, which in turn causes global collapse, and can eventually result in injuries or loss of life. Design of structures against progressive collapse has not been an integral part of structural design. However, some guidelines such as General Service Administration (GSA) and Unified Facilities Criteria (UFC) guidelines have detailing requirements to reduce the likelihood of progressive collapse. It is difficult to predict the structural behaviour of building members during progressive collapse because the dynamic nature of the event and the limited experimental tests conducted to understand the nature of progressive collapse. Membrane action of beams and floors are important mechanisms of load redistribution and progressive collapse resistance in the event of failure of load-bearing elements. The behaviour of reinforced concrete beams under compressive and tensile membrane action is not yet fully understood. In order to investigate and quantify the structural resisting mechanisms of reinforced concrete structures against progressive collapse, two large scale specimens have been tested under quasi-static loading. Non-linear response is then converted into dynamic response (Pseudo– Static response) using the energy equilibrium approach proposed by Izzuddin et al. (Izzuddin et al., 2008) A finite element model was developed using the finite element software package ANSYS 11.0 in order to numerically simulate structural behaviour of RC beam-column subassemblages when load-carrying members are removed under the effect of abnormal loading. A macro-model based approach was used in the finite element analysis by using beam elements and a series of spring non-linear elements to capture the non-linear behaviour of structural members associated with the redistribution of loads after column removal. Numerical results were compared with those obtained from the experimental program. Test results showed that the RC sub-assemblages would experience three mechanism stages, flexural, compressive arch and catenary action stages to resist progressive collapse. Numerical results showed a good agreement with the experimental results.

Item Type: Conference or Workshop Item (Paper)
Schools: Schools > School of Computing, Science and Engineering > Salford Innovation Research Centre (SIRC)
Journal or Publication Title: Proceedings of the 5th International Conference on Integrity-Reliability-Failure
Publisher: INEGI/FEUP
Funders: Iraqi cultural attaché in London-UK
Depositing User: L Augusthus Nelson
Date Deposited: 06 May 2016 14:32
Last Modified: 11 Oct 2016 07:34
URI: http://usir.salford.ac.uk/id/eprint/38894

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