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

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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.

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Funding

The authors did not receive support from any organization for the submitted work. No funding was received to assist with the preparation of this manuscript. No funding was received for conducting this study. No funds, grants, or other support was received. The authors have no relevant financial or non-financial interests to disclose. The authors have no competing interests to declare that are relevant to the content of this article. All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest or non-financial interest in the subject matter or materials discussed in this manuscript. The authors have no financial or proprietary interests in any material discussed in this article.

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  1. Department of Civil Engineering, GITAM, Deemed to be University, Visakhapatnam, Andhra Pradesh, India

    Bhargavi Eranki & Potharaju Malasani

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  1. Bhargavi Eranki
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  2. Potharaju Malasani
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Correspondence to Bhargavi Eranki.

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This is an observational study. This study was reviewed and deemed exempt by our GITAM institutional Review Board.

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Eranki, B., Malasani, P. Residual load carrying capacity of un-stressed RC columns under fire. J Build Rehabil 7, 95 (2022). https://doi.org/10.1007/s41024-022-00227-5

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  • DOI: https://doi.org/10.1007/s41024-022-00227-5

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