Fire resistance of four-faced reinforced concrete columns

A simplified calculation of the fire resistance of four-faced reinforced concrete columns is presented,which considers the effects of material properties,mechanical performance,stability deterioration,and lateral deflection of the columns under high temperature.This approach can accurately evaluate the fire resistance of reinforced concrete columns when exposed to different temperatures and the results agree very well with experimental data.On this basis,various parameters affecting the fire resistance of four-face heated reinforced concrete columns were analyzed.Cross-sectional size,thickness of the concrete protection layer,and compression strength are overriding factors influencing bearing capacity,while the influence of steel ratio and steel strength can be ignored.