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Retrofitting of fire damaged RC columns

Authors: Chinthapalli, Hemanth Kumar; Chellapandian, M.; Agarwal, Anil; Prakash, Suriya;

Retrofitting of fire damaged RC columns

Abstract

The post fire (residual) capacity of Reinforced Columns (RC) members descends drastically due to degradation of concrete strength, permanent deformation and damage (spalling or buckling of rebar’s) in the column. The restoration of such members is essential immediately after the fire event in case of important structures and /or where some part of the structure damaged to fire or fire event may have suppressed after short time which may partially damage the members, where the cost of demonization and reconstruction is very high than retrofitting. The present study have been trying to shed light in restoring the fire-damaged columns back to its service state.The present study focuses to understand the effectiveness of hybrid strengthening technique for retrofitting the fire-damaged columns. The test matrix consists of five short columns in which three were damaged only under fire and two were damaged under fire cum axial load. The parameters considered in this study are concrete strength, duration of fire exposure, damage due to axial load during fire. Experimental results reveal that the hybrid technique restores the original capacity when subjected up to 2 hours fire. The column damaged beyond 2 hours restores to the original capacity. Depending on duration of fire exposure and initial ambient capacity of the column with more than 100% restoration in ductility levels.

Keywords

Retrofitting, Fire damage, Re-habitation, Fire tests, Hybrid strengthening

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
Average
Average
Average
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