基于健康監(jiān)測的橋梁結構有限元模型修正方法研究
[Abstract]:Bridge engineering is a national lifeline project. After the bridge is opened to traffic, with the passage of time, it will be affected by environmental erosion, human factors, material aging, natural disasters and the interaction of vehicle loads, so it will be damaged and degraded to varying degrees. The bridge health monitoring system acquires the structure response information and the bridge environment condition from the sensor real-time monitoring data, calculates and analyzes the data, judges and evaluates the stress state and the resistance attenuation rule of the bridge structure, and ensures the bridge safe operation. Damage identification is the core of the task of health monitoring system. However, the premise of damage identification is to establish an accurate finite element model. In this paper, the dynamic response of bridge health monitoring system is taken as the research object of finite element model modification, and the application of neural network algorithm and response surface method in model modification is studied. The finite element model is modeled and analyzed by ANSYS software. Genetic algorithm is used to optimize neural network, MATLAB is used to program the model correction, and MATLAB is used to develop toolbox to realize the visualization of response surface model modification. The real-time monitoring data based on the health monitoring system can realize the real-time correction of the model and can provide an accurate finite element model for bridge structure calculation in time. The main research contents are as follows: 1. The theory of finite element model modification is introduced and the general process of finite element model modification is explained. 2. Aiming at the deficiency of the traditional acceleration sensor optimization arrangement method, this paper puts forward the method of this paper, combining the engineering experience to complete the optimization layout of the acceleration sensor of the Ju River Bridge; The advantages and disadvantages of different sensors are summarized, and the layout scheme of the full bridge sensor is introduced. 3. Aiming at the defects of general generalized regression neural network, an optimization method based on genetic algorithm is proposed and applied to finite element model modification. The application principle and flow chart of neural network in model modification are introduced in detail. 4. In the MATLAB software environment, the optimized generalized regression neural network model modification method proposed in this paper is applied to the supporting engineering. The accuracy, superiority and effectiveness of the neural network model modification method based on genetic algorithm are verified by the comparison and analysis of the modified results. 5. The principle and process of model modification based on response surface method are introduced, and applied to supporting engineering. A toolbox is developed by using MATLAB to visualize the response surface model modification.
【學位授予單位】:長安大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:U446;U441
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