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Residual load carrying capacity of un-stressed RC columns under fire

Residual load carrying capacity of un-stressed RC columns under fire The present research work is carried out to investigate the effect of cover, temperature, and fire duration on the residual load carrying capacity of unstressed Reinforced Concrete (RC) columns exposed to fire. Experiments were conducted at increased temperatures of 300,500, and 800 °C on 150 × 150 mm RC columns with an L/D ratio of 4, concrete covers of 20,30, and 40 mm, and fire durations of F30 (0.5 h), F60 (1.0 h), F90 (1.5 h), and F120 (2.0 h). Additionally, the residual compressive strength of plain concrete (same batch mix of columns) was evaluated after being exposed to similar fire durations. At all temperatures and fire durations, the percentage residual load carrying capacity of 30 and 40 mm cover columns is almost identical. The residual load carrying capacity decreased with the increase in the temperature. Maximum loss occurred at 800 °C, the loss being 28.10%, 36.15%, 44.69% and 55.34% at 0.5, 1.0, 1.5 and 2.0 h respectively in columns with 40 mm cover. The results of compressive strength of concrete are in good agreement with the column results. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Building Pathology and Rehabilitation Springer Journals

Residual load carrying capacity of un-stressed RC columns under fire

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References (13)

Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2022. Springer Nature or its licensor holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
ISSN
2365-3159
eISSN
2365-3167
DOI
10.1007/s41024-022-00227-5
Publisher site
See Article on Publisher Site

Abstract

The present research work is carried out to investigate the effect of cover, temperature, and fire duration on the residual load carrying capacity of unstressed Reinforced Concrete (RC) columns exposed to fire. Experiments were conducted at increased temperatures of 300,500, and 800 °C on 150 × 150 mm RC columns with an L/D ratio of 4, concrete covers of 20,30, and 40 mm, and fire durations of F30 (0.5 h), F60 (1.0 h), F90 (1.5 h), and F120 (2.0 h). Additionally, the residual compressive strength of plain concrete (same batch mix of columns) was evaluated after being exposed to similar fire durations. At all temperatures and fire durations, the percentage residual load carrying capacity of 30 and 40 mm cover columns is almost identical. The residual load carrying capacity decreased with the increase in the temperature. Maximum loss occurred at 800 °C, the loss being 28.10%, 36.15%, 44.69% and 55.34% at 0.5, 1.0, 1.5 and 2.0 h respectively in columns with 40 mm cover. The results of compressive strength of concrete are in good agreement with the column results.

Journal

Journal of Building Pathology and RehabilitationSpringer Journals

Published: Dec 1, 2022

Keywords: Residual load carrying capacity; Residual compressive strength; Fire duration; RC column

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