Abstract
With the aim to model the seismic behavior of steel reinforced concrete (SRC) frame columns, in this research, hysteresis and skeleton curves were obtained based on the damage test results of SRC frame columns under low cyclic repeat loading and the hysteretic behavior of the frame columns was further analyzed. Then, the skeleton curve and hysteresis loops were further simplified. The simplified skeleton curve model was obtained through the corresponding feature points obtained by mechanical and regression analysis. The nonlinear combination seismic damage index, which was developed by the test results and can well reflect the effect of the loading path and the number of loading cycle of SRC frame columns, was used to establish the cyclic degradation index. The strength and stiffness degradation rule of the SRC frame columns was analyzed further by considering the effect of the accumulated damage caused by an earthquake. Finally, the hysteresis model of the SRC frame columns was established, and the specific hysteresis rules were given. The validity of the developed hysteresis model was verified by e comparison between the calculated results and the test results. The results showed that the model could describe the hysteresis characteristics of the SRC frame columns under cyclic loading and provide guidance for the elastoplastic time-history analysis of these structures.
Highlights
Due to their high bearing capacity and good seismic performance such as energy dissipation and ductility, steel reinforcement concrete (SRC) members, especially frame columns, are widely used in high-rise and super high-rise hybrid structures [1,2,3,4]
For the structural seismic analysis, the existing hysteresis model can be divided into two categories: the polyline hysteresis (PH) model and the smooth hysteresis (SH) model
The nonlinear combination seismic damage index, which was developed by the lots test results and can well reflect the effect of the loading path and the number of loading cycles of steel reinforced concrete (SRC) frame columns, was used to establish the cyclic degradation index
Summary
Due to their high bearing capacity and good seismic performance such as energy dissipation and ductility, steel reinforcement concrete (SRC) members, especially frame columns, are widely used in high-rise and super high-rise hybrid structures [1,2,3,4]. As the basis of elastoplastic calculation analysis, the hysteresis model that can accurately reflect the strength and stiffness degradation, deformation performance, and energy dissipation capacity of structures and members under cyclic repeated loading has been studied [5,6]. The damage index selected in the existing hysteresis model cannot well consider the influence of the number of loading cycles and loading path on the ultimate energy dissipation and deformation capacity of the members. The nonlinear combination seismic damage index, which was developed by the lots test results and can well reflect the effect of the loading path and the number of loading cycles of SRC frame columns, was used to establish the cyclic degradation index. The proposed hysteretic model was validated by comparing the experimental and the numerical results on SRC frame columns
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