Novel random vibration method for large-span bridges under spatially varying non-stationary earthquakes.

Abstract

A novel random vibration method for large-span bridges under spatially varying non-stationary earthquakes is disclosed. Technical points: The motion equation is constructed by the finite element method, the modal analysis is performed on the superstructure, the recursive expression of state response and excitation is constructed, the seismic ground motion input is discretely represented by spectral representation method and mapped to the response of bridge supporting structure, and the explicit expression between total response and random input is constructed, so as to evaluate the time-frequency response statistics. This method overcomes the existing shortcomings, such as low calculation efficiency and is convenient for programming.

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