Study On Building Deformation Monitoring And Safety Evaluation Method

In the nature, several serious natural disasters such as earthquake, flood, and typhoon happens frequently, which makes people have a widespread worry about the safety of buildings. In fact, the influence of loading condition changing, environment and structure aging also largely decrease the safety of buildings. Therefore, how to use effective method to monitor and evaluate the safety condition of buildings built and how to design a long-term safety monitor system for important newly-built buildings have become a worldwide hot topic, which is also a difficult problem in civil engineering.Supported by the fund of science and technology innovation of wuhan university-Research on Safety Monitoring and Safety Condition Evaluation of the Building and combining the engineering monitor practice, we research the deformation monitoring problems and the safety evaluation of monitored behavior of building in this dissertation. Then some suggestion and methods are presented. The main contents are as follows.1. Summarize the technology of building deformation monitoring. A discussion is made on the design of monitoring plane and optimization of monitoring network. The genetic analysis is carried out for the system error and gross error of the prototype observed data of building. The research on the limitation of traditional method of gross error checking and its improved method is also made. Furthermore, a rank defect free network adjustment analysis on multi-period monitoring net is made to judge the overall and local stability of preference points in engineering practice. The research shows that the result is well consistent with the practical conditions.2. According to the characteristics that the aging deformation of building is monotonous and less random, we introduce gray system theory. Based on the analysis of modeling characteristic of common gray model, we create the new information model of equal dimension of the GM(1,1), which can externalize the system's latest information and can reflect the engineering's dynamic change. And an improved analysis is made on unequal time series gray model applying coefficient revision method. Combining the engineering practice, we make a calculation analysis on monitoring model and forecasting precision, and obtain a fairly good effect of monitoring.3. Applying visual programming design tool-VC++6.0 and object-oriented programming technology, we edit a program of gray monitoring and forecasting model of building deformation based on theoretical analysis. A research is made on the optimal dimension area of gray model by using numerical experiment. Three different gray models are created and the effect of every model is contrasted with each other. The result shows that the new information gray model of equal dimension can expediently monitor and forecast the building deformation and can present concerning graph directly, which has great utility value.4. With the discussion about the method of safety evaluation of building deformation monitoring, the principle and methods of define monitoring index is researched using many kinds of engineering theories. The concerning safety evaluation models are presented combining engineering practice. Furthermore, according to the limitation in safety evaluation of building using single deformation monitoring index, the synthetic safety evaluation of building and decision-making analysis are elementarily probed. Compared with single-index method, the synthetic judgment method shows its great advantage and utility perspective.