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为了分析研究在GPS实时动态变形监测下苏通大桥通车后索塔变形特征,该文采用奇异谱分析方法,通过蒙特卡洛方法估计噪声强度区间,以区间长度最小来确定最优窗口长度,并识别和提取出苏通大桥二月份索塔变形数据的周期成分、趋势成分。结果表明:索塔变形主要受车辆荷载、温度和风压的综合影响,其中温度、风压呈现明显的周期变形特性,最大占总变形的40%。
In order to analyze the deformation characteristics of the tower after the opening of Sutong Bridge under GPS real-time dynamic deformation monitoring, this paper uses the singular spectrum analysis method to estimate the noise intensity interval by the Monte Carlo method, and determines the optimal window length with the minimum interval length. Identify and extract the period component and trend component of the February tower deformation data of Sutong Bridge. The results show that the deformation of pylon is mainly affected by the load of vehicles, temperature and wind pressure. The temperature and wind pressure show obvious cyclic deformation characteristics, and the maximum is 40% of the total deformation.