基于小波多尺度的索塔锚固区变形特征提取

摘要

Frequently monitoring data for the cable-tower anchorage zone of Sutong Bridge showed that in the various noises leading to data distortion,tall structures,such as,cable towers are obviously affected by temperature and backward-sunflower phenomena appear.In order to find the deformation of cable-tower caused by temperature and accurately evaluate the safety of cable-tower,combining the real-time meteorological date and the construction schedule,adopting the wavelet multi-scale denoising method at regular time intervals,the excursion of cable tower caused by temperature was extracted step by step.The deformation features of cable-tower anchorage zone brought by construction condition were extracted.Reliable calculation and analysis basis for mechanical behavior of anchorage zone and construction control were provided.%苏通大桥索塔锚固区高频度监测数据显示,在造成数据失真的各种噪声中,温度对类似索塔高耸构筑物的影响尤其明显,会使其产生“背日葵”现象,为查清温度导致的索塔变形情况,准确评估索塔的安全性,结合实时的气象资料和工况,分时段采用小波多尺度去噪方法逐层分离出温度产生的索塔偏离度,提取因实际工况产生的索塔锚固区变形特征.为锚固区传力机理及施工控制提供可靠的计算分析依据,对高耸构筑物受力分析具有很好的工程应用前景.