College of Civil and Environment Engineering ,Ningbo University
Quasi-static cyclic tests were performed on one SRC column- RC beam frame after exposure to fire and the other comparative frame at ambient temperature to investigate the post-fire performance of such frame．Load bearing capacity, stiffness degeneration, ductility, energy dissipation were evaluated, and accumulative damage as well as P-? effect were analyzed. Test results showed that SRC column-RC beam frame after exposure to fire have lower bearing capacity, smaller stiffness, lower ductility, increased accumulative damage and more obvious P-? effect compared with its unexposed counterpart. Owing to the existence of core steel in the section of frame columns, the hysteresis loops of SRC column-RC beam frame after exposure to fire still kept plump, and the load bearing capacity could maintain a relatively high level before destruction. Moreover, SRC column-RC beam frame after exposure to fire exhibited good energy consumption ability. The plastic limit rotation of it exceeded 0.04rad, which could well meet the requirement of China seismic design code.