Research On The Performance Degradation And Rehabilitation Of Steel Reinforced Concrete Columns After Exposure To Fire

A reasonable and feasible program is developed to research the performance degradation andrehabilitation of steel reinforced concrete columns after exposure to fire, designed17steelreinforced concrete axial and eccentric columns mainly considering the temperature, fire time,slenderness ratio and load eccentricity. After exposure to fire, part of the specimens wererehabilitated with CFRP and angle bar. A bearing capacity test was conducted after placing thestrain gauges and dial indicators. During the whole testing, the strain distribution, failure process,the failure modes and the residual bearing capacity were carefully observed and recorded in detail.Based on the17steel reinforced concrete column test results, the influence of temperature andfire time on the mechanics performance of steel reinforced concrete column was basically obtained,the relationship between the bearing capacity, deformation stiffness and the temperature, fire timewas confirmed, and the influence of slenderness ratio, eccentricity on the bearing capacity of steelreinforced concrete column was also discussed. With reference to existing research results at homeand abroad, the constitutive relation of steel and concrete after fire was selected, and thetemperature field was calculated, and based on this, a calculation model of the finite elementanalysis software MSC.MARC was verified through comparing to the test specimens. With theverified model, conducted a more extensive computational analysis about the residual capacity ofsteel reinforced concrete column with different steel ratio, different steel size, different slendernessratio and different eccentricity, studied the influence of the parameters on the residual capacity ofsteel reinforced concrete column after exposure to fire. Based on the experiment and calculationresults, evaluated the residual capacity of steel reinforced concrete column after exposure to fire.