In:
Proceedings of the Institution of Civil Engineers - Structures and Buildings, Thomas Telford Ltd., Vol. 173, No. 1 ( 2020-01), p. 17-30
Abstract:
Conventional concrete-filled-tube columns may have welding defects when welders of limited skill have been involved in their production; such defects could cause a rapid degradation of the columns’ strength during a fire. In the study reported in this paper, non-welded columns with mechanical strip connections were developed. Their structural performance, plus that of a typical welded column, was evaluated under both ambient and elevated temperatures. Axial loads were applied to all specimens; for fire resistance the axial load ratio was 40% and an ISO 834 standard fire curve was applied without fire protection. The non-welded columns with mechanical strip connections showed 15% higher strength under ambient temperature and resisted 40 min longer under elevated temperature compared to the typical welded column. Also, local buckling by compression was barely observed in the non-welded columns, whereas a large buckling was shown in the typical welded column under both ambient and elevated temperatures. It is concluded that non-welded columns with mechanical strip connections provide a viable way to avoid the welding problems of typical concrete-filled-tube columns, providing good performance under fire without fire protection.
Type of Medium:
Online Resource
ISSN:
0965-0911
,
1751-7702
DOI:
10.1680/jstbu.16.00170
Language:
English
Publisher:
Thomas Telford Ltd.
Publication Date:
2020
detail.hit.zdb_id:
240740-1
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