Experimental and theoretical studies were carried out to develop general methods for the prediction of the fire resistance of reinforced concrete columns. In these studies, which were carried out jointly between the National Research Council of Canada and the Portland Cement Association, 41 columns were tested. The parameters studied included bad level, amount of steel reinforcement, effective length of column, concrete strength, moisture Content, area and shape of cross section, aggregate type, axial restraint of thermalexpansion and load eccentricity. The experimentally discovered effects of these parameters are discussed.Des \ue9tudes exp\ue9rimentales et th\ue9oriques ont \ue9t\ue9 men\ue9es pour \ue9laborer des m\ue9thodes de pr\ue9vision de la r\ue9sistance au feu de colonnes de b\ue9ton arm\ue9. Dans le cadre de ces \ue9tudes, r\ue9alis\ue9es conjointement par le Conseil national de recherches du Canada et la Portland Cement Association, 41 colonnes on \ue9t\ue9 mises \ue0 l'essai. Les param\ue8tres \ue9tudi\ue9s comprenaient le niveau des charges., l'importance des armatures d'acier, la longueur de flambage des colonnes, la r\ue9sistance du b\ue9ton, la teneur en eau, l'aire et la forme de la section, le type de granulat, la limite axiale de dilatation thermique et l'excentricit\ue9 de la charge. Les effets de ces param\ue8tres r\ue9v\ue9l\ue9s par les exp\ue9riences sont analys\ue9s.Peer reviewed: YesNRC publication: Ye