面向健康診斷的斜拉橋模型損傷識別試驗研究
[Abstract]:With the development of the times, the progress of science and technology, the innovation of materials, cable-stayed bridges gradually develop to the direction of super-span, and become one of the preferred bridge types of long-span bridges. Under the influence of long-term operation conditions and external environment, there will be a variety of damage to bridge structure. If it is not found and dealt with in time, it will lead to the decrease or even damage of the bearing capacity and durability of the structure, so the real-time monitoring of the structure is of great significance. In order to establish a health monitoring system, this paper carried out the following aspects of work: 1. According to the data of long span cable-stayed bridge at home and abroad, the physical test model of 6 m long cable-stayed bridge is designed and constructed. The model realizes the functions of detachable and replaceable components, can simulate various working conditions, has high pertinence and good economy. The structural health monitoring system was established based on the model. The static and dynamic characteristics of the model are preliminarily determined by using the finite element software ANSYS. Model test. Use various sensor equipment to collect data. The dead load test of main beam and the static load test of vehicle at specified point are first carried out, and the results are compared with the finite element method. Secondly, the model is restored to the reference state, and the damage of the cable and the main beam is tested under the static load of the model. Finally, non-destructive test and cable damage test of the model under moving load are carried out. Analysis of test results. The data show that the test data of cable-stayed bridge vary regularly and the structure is in an elastic working state, and the damage of the structure can be determined from the parameters such as the deflection of the main beam, the change rate of strain and cable force of the main beam, etc. Multiple parameter analysis is more accurate than single parameter analysis in identifying damage location and damage quantity. In this experiment, it is difficult to find the damage of the structure from the change of natural frequency. The Wigner-Ville (WVD) distribution cross term is used to identify the damage of the structure. The MATLAB program is designed with the help of MATLAB time frequency analysis toolbox. ANSYS finite element software is used to simulate the damage of simply supported beam and cable damage to the model of cable-stayed bridge. The results show that the method can locate the damage, but it needs further study.
【學位授予單位】:大連海事大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:U448.27
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