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Title: Slab corner effect on torsional behaviour of perimeter beams under missing column scenario
Authors: Pham, Anh Tuan
Pham, Xuan Dat
Tan, Kang Hai
Keywords: Load Transfer
Engineering::Civil engineering
Structural Analysis
Issue Date: 2019
Source: Pham, A. T., Pham, X. D., & Tan, K. H. (2019). Slab corner effect on torsional behaviour of perimeter beams under missing column scenario. Magazine of Concrete Research, 71(12), 611-623. doi:10.1680/jmacr.18.00011
Series/Report no.: Magazine of Concrete Research
Abstract: Perimeter beams in reinforced-concrete buildings are subjected to considerable torsion from slab negative bending moments. In the event of progressive collapse caused by column removals, torsion effects on such beams become critical, owing to redistribution of loads. The aim of this study is to explore the effects of slab corners on the torsional behaviour of perimeter beams in reinforced concrete beam–slab buildings, particularly in the case of column loss. A series of torsional tests on peripheral beams was conducted, comparing cases with and without slabs. Thereafter, physics-based numerical models were developed, based on the test results, to investigate the effect of varying the slab's parameters, such as thickness and reinforcement ratio, on torsional capacity. The models showed that the presence of reinforced concrete slabs could increase the torsional strength of perimeter beams by as much as 97%. The enhancement came first from the slab corner, which acted as a set of compressive struts. This effect increased with increasing slab thickness. It was also observed that the slab corners tend to shift torsional failure (which occurred at the twisted beam near the support) to about one beam depth away. The contribution of negative bending moment from slab reinforcement along the edges could also enhance overall structural capacity.
ISSN: 0024-9831
DOI: 10.1680/jmacr.18.00011
Rights: © 2019 Thomas Telford (ICE Publishing). All rights reserved. This paper was published in Magazine of Concrete Research and is made available with permission of Thomas Telford (ICE Publishing).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles

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