基于撓度影響線的拱結構損傷識別研究
[Abstract]:The health status of bridge structure has an important impact on transportation and even the development of national economy. How to realize the location of bridge structure damage and how to judge the damage degree. In order to repair in time is the current research hotspot in the field of bridge health diagnosis. In this paper, the arch rib damage problem of arch bridge structure is studied, and a damage identification method based on deflection influence line principle is proposed, and its effectiveness is verified by experiments. The main research work is as follows: 1. Several damage identification methods used at home and abroad, including modal mode method, flexibility matrix method and natural frequency method, are compared and studied. Firstly, the theoretical basis of various methods is introduced, then the finite element model of single arch structure with damage is established by using the finite element software Midas/Civil, and the effectiveness of these existing methods is verified by numerical examples. The advantages and disadvantages of several methods are compared and analyzed. The deformation geometry relation and vibration theory of arch structure are introduced. The basic principle of deflection influence line method is studied. The second derivative difference method is used to identify the damage of arch structure. Numerical examples show that the method is sensitive to the damage of arch structure and can effectively locate the damage and evaluate the damage degree. In addition, the finite element method is used to simulate and analyze the effect of different loading speed on damage identification. The optimal arrangement method of displacement sensor based on deflection effect line damage identification method is studied. The effective independent method and the improved effective independent method are used to calculate the optimum measuring points of arch structures under different working conditions. An Midas numerical example is used to verify the results. By comparing with simply supported beam, it is found that, unlike simply supported beam, the deflection near 1 / 4 span of arch structure has a great effect on the amplitude of the line, which is easy to measure and can be used to identify damage more effectively. A large number of single arch model damage identification tests were carried out. Under laboratory conditions, the damage identification of arch structures under different working conditions was carried out by using deflection influence line method, and the effects of different deflection measuring points on damage identification were compared and analyzed. The experimental results show that the second derivative difference of deflection can effectively locate the damage and judge the damage degree. The deflection influence line amplitude of different measuring points is quite different. Selecting the deflection influence line of reasonable measuring points to identify the damage of arch structure provides a new method for the damage detection of arch structure.
【學位授予單位】:廣州大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:U446
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