基于高阶谱的大跨悬索桥风致振动模态分析

Modal Analysis of Long Span Suspension Bridges Under Wind-Induced vibration based on HOS

为研究大跨悬索桥的风致振动及在大风下的模态 ,利用已建立的虎门大桥实时监测系统获得了风致振动数据。在比较几种传统的时域和频域模态识别方法的基础上 ,提出基于高阶谱的 ARMAV模型对振动数据进行分析。这种方法基于高阶谱分析 ,有别于传统的功率谱分析 ,其模态分析结果同已建立的有限元 3- D模型数值计算结果是吻合的 。

In order to study the wind induced vibration and modal of long span suspension bridges under large wind, the data of wind induced vibration response are got by the real time monitoring system of Humen Bridge. An ARMAV model based on HOS is put forward to modal analysis of the data by comparing several time and frequency domain modal analysis techniques. This technique uses HOS other than PSD for avoiding the shortages cased by PSD. Its modal analysis results fally with the 3 D FEM results and the validate this method.