EXPERIMENTAL STUDY ON POST-FIRE PERFORMANCE OF PARTIALLY PRECAST STEEL REINFORCED CONCRETE COLUMNS SUBJECTED TO ECCENTRIC COMPRESSION

To investigate the post-fire performance of eccentrically loaded partially precast steel reinforced concrete (PPSRC) columns and hollow precast steel reinforced concrete (HPSRC) columns, fire test and post-fire eccentric compression test of six specimens together with one control specimen unexposed to fire were carried out. Both PPSRC columns and HPSRC columns were fabricated with high-performance outer shells made of reactive powder concrete. The effects of fire time, eccentricity and strength of inner concrete on the internal temperature distribution under fire and the residual bearing capacity and deformability post fire were studied. Meanwhile, the temperature field of the specimens under fire was modelled. The test results indicated that the fire-damaged specimens experienced a similar failure mode compared with the control specimen unexposed to fire during the post-fire eccentric compression. The residual bearing capacity decreased with the increasing of fire heating time and eccentricity, and both the deformability and residual bearing capacity increased with the increasing of core concrete strength.