Fire Resistance of Axially and Rotationally Restrained Concrete-Filled Double-Skin and Double-Tube Hollow Steel Columns
Publication: Journal of Structural Engineering
Volume 145, Issue 11
Abstract
The use of concrete-filled hollow steel columns is increasing in construction. These columns with a high load-bearing capacity allow the use of smaller cross sections. However, the use of slender elements in buildings makes necessary new construction solutions that ensure the required performance in case of fire. This paper presents the results of experimental research on the performance of thermal restrained concrete-filled double-skin and double-tube hollow steel columns subjected to fire. The influence of several parameters on the behavior of these columns in the case of fire was tested, such as the type of concrete infill (normal, high-strength, and light-weight concrete), loading level, and axial and rotational restraint level. This type of column has two concentric tubes in which the outer tube has a diameter twice that of the inner tube. The double-tube columns were completely filled with concrete; the double-skin columns had concrete only between the tubes, and the inner tube was empty. The results of this research show that the loading level had a large effect on the reduction of the fire resistance (critical time) of the tested columns. However, the type of concrete and the thermal restraint level had a minor effect. The double-tube columns did not have much better fire performance compared with the double-skin tubes.
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Acknowledgments
The authors gratefully acknowledge the European Commission (EU) for support under research project FRISCC (RFSR-CT-2012-00025) and the Brazilian Coordination for the Improvement of Higher Education Personnel (CAPES) for the scholarship given to the first author (CAPES/PSDE/88881.133408/2016-01).
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Published In
Journal of Structural Engineering
Volume 145 • Issue 11 • November 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: May 5, 2018
Accepted: Mar 19, 2019
Published online: Aug 29, 2019
Published in print: Nov 1, 2019
Discussion open until: Jan 29, 2020
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