摘要
及时准确地掌握桥梁的振动频率对桥梁健康监测和安全运营具有十分重要的意义。对苏通大桥钢箱梁GPS-RTK动态监测的三维变形数据进行时程变化分析。为有效地识别振动信号,针对传统谱估计算法的不足,提出采用基于AR模型的现代功率谱估计方法对监测数据进行频谱分析,计算得到了苏通大桥主梁振动的特征要素,所得结果与有限元计算值吻合。
It is of great significance to obtain the bridge vibration frequency timely and accurately.In this paper,the time change rule of Sutong Bridge＇s steel box girder is discussed according to the three-dimensional deformation data collected by GPS-RTK dynamically.According to the deficiency of traditional spectrum estimation algorithm,the modern spectrum estimation algorithm based on AR model is proposed to analyze the spectrum of monitoring data so as to identify the vibration signal effectively.The vibration characteristic values of Sutong Bridge＇s main girder are obtained by calculation and verified by the finite element method.
出处
《水利与建筑工程学报》
2012年第2期36-40,共5页
Journal of Water Resources and Architectural Engineering
基金
国家自然科学基金资助项目(51079053)
关键词
苏通大桥
钢箱梁
变形监测
AR模型
现代谱估计
Sutong Bridge
steel box girder
deformation monitoring
AR model
modern spectrum estimation
