With the aim to model the seismic behavior of steel reinforced concrete (SRC) frame\ncolumns, in this research, hysteresis and skeleton curves were obtained based on the damage test\nresults of SRC frame columns under low cyclic repeat loading and the hysteretic behavior of the frame\ncolumns was further analyzed. Then, the skeleton curve and hysteresis loops were further simplified.\nThe simplified skeleton curve model was obtained through the corresponding feature points obtained\nby mechanical and regression analysis. The nonlinear combination seismic damage index, which was\ndeveloped by the test results and can well reflect the effect of the loading path and the number of\nloading cycle of SRC frame columns, was used to establish the cyclic degradation index. The strength\nand stiffness degradation rule of the SRC frame columns was analyzed further by considering the\neffect of the accumulated damage caused by an earthquake. Finally, the hysteresis model of the SRC\nframe columns was established, and the specific hysteresis rules were given. The validity of the\ndeveloped hysteresis model was verified by e comparison between the calculated results and the test\nresults. The results showed that the model could describe the hysteresis characteristics of the SRC\nframe columns under cyclic loading and provide guidance for the elastoplastic time-history analysis\nof these structures.
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