Research on the fire performance of high strength concrete columns considering spalling

Spalling occurs when high strength concrete(HSC) columns are exposed to fire,which decreases the fire resistance of columns.Studies show that the numerical modeling becomes difficult because of the randomness of spalling.In this paper,the finite element software ABAQUS was used to develop the model for numerical anal ysis of HSC columns related to the spalling and the model was verified by test data.The verified model was then used to analyze the effect of spalling on the temperature field,the effect of the length and depth of spalling on the fire resistance and axial deformation.The result shows that the temperature of cross section rises when the depth of the spalling increases.On condition that keeps the same depth of spalling invariability,with the increase of the spalling length,the fire resistance reduces and the axial deformation increases.On condition that keeps the length of spalling invariability,the fire resistance of HSC columns decreases significantly with the increase of the spalling depth.