
doi: 10.14264/8b1eb4f
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.
Retrofitting, Fire damage, Re-habitation, Fire tests, Hybrid strengthening
Retrofitting, Fire damage, Re-habitation, Fire tests, Hybrid strengthening
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