| The occurrence probability of the earthquake-induced fire is extremely high, the secondary fire after the earthquake caused huge property damage and casualties. In this paper, fire response and bearing capacity degradation of R.C frame though strong earthquake were preliminarily studied, the main contents are as following:1)The status about experimental study and theoretical analysis of domestic and foreign R.C frame materials and components under fire were comprehensively reviewed. Achievements and shortcomings were comprehensively analyzed as well.2)Two full size R.C frames KJ1 and KJ2 were designed. Low-cycle repeated horizontal loading test was tested on KJ1. By analyzing frame characteristics and crack development under cyclic horizontal loading, drawing the load - displacement hysteretic curves, skeleton curve and the load - strain curve of steel, earthquake damage state was concluded to provide an initial state for the fire test.3)Based on the results of previous studies, the R.C frame fire tests were undertaken to KJ1 and KJ2 adopting the standard temperature curve. By simulating the stress state of the R.C frame, real-time response, destruction of R.C frame, the state of cross-section temperature distribution and axial deformation of columns were recorded respectively. Compared with the R.C frame KJ2 without the low-cycle repeated horizontal loading test, temperature distribution, the crack developing patterns and the degradation of material properties were analyzed.4)According to the measured cross-section temperature, high-temperature cross-section bearing capacity of frame members was theoretically analyzed and bearing capacity degradation of R.C frame through strong earthquake was concluded.
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