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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/5482
Title: Behaviour of continuous concrete filled steel tubular columns loaded concentrically in fire
Authors: Ukanwa K.U.
Sharma, Umesh Kumar
Hicks S.J.
Abu A.
Lim J.B.P.
Clifton G.C.
Published in: Journal of Constructional Steel Research
Abstract: Design recommendations for concrete filled steel tubular (CFST) columns in fire are based on the results of experimental standard fire testing of CFST members where the same temperature is applied to the column over the full column height. However, this is not representative of a CFST column in a typical building, which is continuous between floors and which, in fire, is subjected to severe fire conditions on one floor at a time while the floors above and below remain cooler. In the experimental tests described in this paper, the columns are of 3.2 m height with the fire applied only to the central 2 m. Significant differences are observed between these tests and those previously conducted due to the partial length heating. In total, ten tests are conducted; the tests cover three different types of infill: plain concrete; bar reinforced concrete; and steel fibre reinforced concrete. End restraint conditions of fixed-fixed (F-F) and pinned-fixed (P-F) are considered; the axial load levels are between 0.33 to 0.38 of the squash load. The longitudinal elongation of the steel tube was less than 3 mm. Using the experimentally measured structural fire resistance (R), the axial capacity in fire was calculated in accordance with the codes of practice and are Compared with the experimentally tested structural fire resistance, showing that in some instances current design practice can be un-conservative. ¬© 2017 Elsevier Ltd
Citation: Journal of Constructional Steel Research(2017), 136(): 101-109
URI: https://doi.org/10.1016/j.jcsr.2017.05.011
http://repository.iitr.ac.in/handle/123456789/5482
Issue Date: 2017
Publisher: Elsevier Ltd
Keywords: Concrete-filled steel tubular columns
Continuous columns
Fibre reinforced concrete
Fire resistance
ISSN: 0143974X
Author Scopus IDs: 57194383496
57214359120
7102152734
24461072100
7403452656
57211384282
Author Affiliations: Ukanwa, K.U., Department of Civil and Environmental Engineering, The University of Auckland, Auckland, New Zealand
Sharma, U., Department of Civil Engineering, India Institute of Technology, Roorkee, India
Hicks, S.J., New Zealand Heavy Engineering Research Association, HERA House, Auckland, New Zealand
Abu, A., Department of Civil and Natural Resources Engineering, University of Canterbury, Christchurch, New Zealand
Lim, J.B.P., Department of Civil and Environmental Engineering, The University of Auckland, Auckland, New Zealand
Clifton, G.C., Department of Civil and Environmental Engineering, The University of Auckland, Auckland, New Zealand
Corresponding Author: Clifton, G.C.; Department of Civil and Environmental Engineering, The University of AucklandNew Zealand; email: c.clifton@auckland.ac.nz
Appears in Collections:Journal Publications [CE]

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