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大跨径斜拉桥索塔监测在整个桥梁的建设与运营期间起着关键性的作用,关系着索塔投入使用的安全。由于温度、风速气压、日照和拉索拉力等因素影响,很难建立严格的函数关系模型。该文结合某大跨径斜拉桥索塔变形监测实例,介绍逐步回归分析模型的建立,着重讨论索塔变形的主要影响因素,借助Matlab软件预测索塔不同时段顶部点位的变形值,并与TM30全站仪实测的索塔变形数据进行比较,从而分析索塔的变形规律,为索塔的安全监测、主梁施工和斜拉索张拉提供可靠的科学依据。
Long-span cable-stayed bridge pylon monitoring plays a key role in the construction and operation of the entire bridge, and is related to the safety of the pylon. Due to the influence of temperature, wind pressure, sunshine and pull force, it is difficult to establish a strict functional relationship model. In this paper, a case study of tower deformation monitoring of a large span cable-stayed bridge is introduced. The establishment of stepwise regression analysis model is introduced. The main influencing factors of cable tower deformation are mainly discussed. By using Matlab software, Compared with the pylon deformation data measured by the TM30 total station, the deformation law of the pylon is analyzed, which provides a reliable scientific basis for the safety monitoring of the pylon, the construction of the main girder and the tension cable stay.