The Application Of The Grey System Theory On High-rise Buildings Deformation Monitoring

The fast development of economics promotes the urbanization of China. More and more high-rises appear in our cities. In order to ensure the service life and security of constructional works, it’s necessary to monitor the constructional work systematically during its building and operating. The purpose of deformation monitor is analyzing and holding the future deformation characters and rules of the constructional work by using the long-term accumulated surveying datum and forecasting. At present, it has formed a set of mature theoretical systems, and abundant trend approaching and forecasting models have come out, such as regression model, Kalman smoothing model, timing series model, Artificial Neural Networks, Wavelet Analysis, Grey Model and so on.Grey System Theory is a theory that partial information is known and others are unknown. The uncertain system about small sample and poor information are the study object of grey system theories. The actual world is described and recognized accurately by generating and developing the partial known information. The deformation monitor date is a discrete grey series, so it’s ideal and effective to apply the grey system theory to the data processing of deformation monitoring.Considering this requirement, this paper based on the Grey System Theory, using the Grey Model in a large bridges deformation monitoring information analyze and forecast, the main research work are as follows:1) At first, this paper analyzed the present methods of deformation analyze and forecast, and illustrated the advantages of Grey System Theory used in deformation monitoring. After that, we analyze and discuss of the Grey System Theory.2) Secondly, start from the grey forecast and grey modeling, we analyzed the shortcoming and limitation of traditional GM(1,1) model. Based on it, we modified the model background values and raised the Liner-Grey model at the same time.3) This paper combined with the data sample of a large bridges settlement, with the tool of Matlab7, use the new model simulated and forecast the deformation monitoring of a large bridges. Comparing the traditional model with improved one, the result illustrates the reliability and advantage of improved GM(1,1) model.