基于Matlab的逐步回归分析在索塔变形中的应用

Applications of Stepwise Regression Analysis in Cable Tower Deformation based on Matlab

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。

The large-span cable-stayed bridge cable tower monitoring plays a key role in the bridge construction and operation. It respects to the safety of the cable tower used. Due to the temperature,wind pressure,sunshine,pulling force of the cable and other factors,the strict function relation model is difficult to build. This paper combined with a deformation monitoring practice of large-span stayed cable tower,the stepwise regression model is built. The important influence factors of cable tower deformation is discussed. Using the Matlab software,the deformation value of the top of cable tower in different time is predicted. The prediction value is compared with the actual data of cable tower deformation which is measured by TM30 total station instrument. The cable tower deformation law is analysed. It provides the reliable science basis for cable tower safety monitoring,the main beam construction and the pulling force of stayed cable.