METHOD FOR REAL-TIME IDENTIFICATION, MONITORING, AND EARLY WARNING OF VORTEX-INDUCED VIBRATION EVENT OF LONG-SPAN SUSPENSION BRIDGE

摘要

A method for real-time identification, monitoring, and early warning of a vortex-induced vibration event of a long-span suspension bridge, comprising: first monitoring an acceleration signal of a bridge and calculating a spectrum; determining a high-pass filtering cut-off frequency according to a first-order frequency of the bridge corresponding to a first-order energy peak in the spectrum, removing low-frequency noise interference in the signal by means of filtering, and calculating real-time vibration displacement of the bridge by means of a recursive acceleration integration method; and performing real-time recursive Hilbert transform on the integrated displacement data to obtain a real part and an imaginary part of signal data, and performing complex plane expression and evaluation on the signal, to implement identification and early warning of vortex-induced vibration. The method has the characteristics of having high real-time performance and high precision and being accurate and intuitive, and allows for online vortex-induced vibration identification in real time and measurement of vibration characteristics of bridges during vortex-induced vibration, thereby implementing early warning and online monitoring of vortex-induced vibration for the bridges.