Experimental study on seismic performance of post-fire reinforced concrete frames.

Highlights • The influence of fire exposure and column-to-beam bending capacity ratio on the post-fire seismic performance of reinforced concrete frames were investigated experimentally. • Under room temperature, the strong-beam-weak-column frame failed in column-end shearing, the strong-column-weak-beam frame failed in beam-end plastic hinging. • After exposure to fire, the failure modes of both the two frames changed to column shear-bond failure. • The bearing capacity, stiffness, ductility factor, and energy dissipation decreased after fire, and the bearing capacity of the strong-beam-weak-column frame decreased more seriously. Abstract To investigate the post-fire seismic behaviour of reinforced concrete (RC) frames with different column-to-beam bending capacity ratios, four specimens were fabricated, which included a strong-beam-weak-column frame and a strong-column-weak-beam frame either under room temperature or after being exposed to fire. The fire test was conducted in a furnace chamber, followed by quasi-static tests under a low-frequency cyclic load. The crack patterns, hysteretic loops, plastic hinges, and failure modes were investigated in the loading process. The influence of two factors, i.e., the fire exposure and the column-to-beam bending capacity ratio, on the mechanical performance, ductility, stiffness degradation, and energy dissipation was compared and analysed. The experimental results indicated that the ultimate bearing capacity, the stiffness, the ductility factor, and the energy dissipation capacity of the RC frames decreased after fire exposure. The bearing capacity of the strong-beam-weak-column frame decreased even more seriously. Although the yielding displacements of the post-fire frames increased, their ultimate displacements decreased. In addition, the strong-column-weak-beam frame under room temperature failed in the form of beam-end plastic hinging, while after being exposed to fire, the failure mode changed to shear-bond failure in column. [ABSTRACT FROM AUTHOR]