Seismic Fragility Analysis of Steel Frame Structures with Self-centering SRC Wall Panels
In order to study the seismic performance of steel frame structures with steel reinforced concrete(SRC)self-centering wall panels,a series of cyclic tests on sub-structure model of the structures were carried out to study the working mechanism and failure mechanism.A nonlinear analysis model based on macroscopic elements was proposed,and then the test results were used to verify the accuracy of the model.The results indicated that the analysis model can well simulate the nonlinear behavior of the self-centering wall panels.Models of a 6-story and a 15-story steel frame structure with self-centering SRC wall panels were established for the incremental dynamic analysis(IDA).Taking peak ground acceleration as ground motion intensity index and maximum inter-story drift as damage index,the fragility curves of different limit states were obtained,and the fragility matrix was established according to IDA results.Then the damage risk of the structures under different limit states was evaluated.The results show that the collapse probability of 6-story and 15-story steel frame structures with self-centering SRC wall panels within 50 years is 0.138％and 0.095％,which is much lower than 1％specified by FEM A750.Therefore,the steel frame structures with self-centering SRC wall panels have a good seismic performance and collapse resistance.
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