涪江斜拉索跨越管桥结构自振特性分析

涪江斜拉索管道跨越工程是中坝至青白江输气干线上的重要工程,呈现高次超静定、高柔性的结构特点,结构工作在几何非线性状态。要准确分析结构在各种荷载下的静、动力响应规律,就必须首先对管桥结构的自振特性进行合理科学的分析。基于结构自身特性,利用子空间迭代法对斜拉索管桥的各阶自振周期、频率、振型进行分析,得到的自振特性与现场测试结果一致,这说明采用的分析方法正确可行,从而为进一步的管桥动载荷响应规律分析提供了条件。

Analysis of the Self-vibrating Characteristics of the Fujiang Cable-stayed Gas Aerial Crossing Pipeline

The Fujiang cable-stayed aerial crossing pipeline,characteristic of high overstability and high flexibility,is the key part of the gas transmission pipeline system from Zhongba to the Qingbai River.It usually works in a geometric non-linear state.In order to get a precise result of the dynamic characteristics of the aerial crossing pipeline,the self-vibration characterstics must be studied firstly.Based on the method for the subspace iteration,the self-vibration features,including the vibration period,vibration frequency and vibration type,were analyzed.The result obtained is accordant to the testing data,which shows that the model and the method can be used to analyze the pipeline bridge and it lays a foundation for a further study of the dynamic response of the cable-stayed gas aerial crossing pipeline.