Long-span arch bridge seismic capacity probability assessment method based on time-frequency hybrid calculation

The invention discloses a long-span arch bridge anti-seismic capacity probability assessment method based on time-frequency hybrid calculation, and relates to the technical field of bridges. Comprising the following steps: S1, parameter acquisition; s2, a model building step; s3, a model preprocessing step; s4, a time-frequency modulation function segmentation interpolation step; s5, exporting a response expression; and S6, an anti-seismic capacity probability evaluation step. According to the method, an explicit response expression of a large-span arch bridge structure under any time-frequency modulation seismic excitation is derived by fusing a spectral decomposition technology, a modal superposition method and a segmented interpolation technology of a time-frequency modulation function, so that the calculation cost of non-stationary seismic response probability analysis of the large arch bridge structure is greatly saved; and the high-efficiency probability evaluation of the anti-seismic capacity of the ar