日照條件下公路箱形組合梁橋溫度場與溫度應(yīng)力分析
[Abstract]:Long-term exposure of bridge structure to sunlight, ambient temperature and other factors affect the structural temperature field. Extreme weather, such as sun exposure or sudden temperature drop, will form a large temperature gradient on the surface and interior of the structure, resulting in temperature stress. Sometimes the temperature stress is even larger than the stress produced by live load. Many concrete bridges have cracks and even serious cracks, which bring great harm to the bridge structure. The most direct way to study the temperature field is to measure the temperature field. However, for different types of bridges in different regions, the long-term observation at each measuring point is very uneconomical and impractical. Finite element simulation is one of the methods to study the temperature field of beam. Compared with the actual measurement, the finite element simulation model saves time and effort. However, whether the model is consistent with the actual situation or not has become a sign of the accuracy of the direct evaluation model. Based on the measured data of sunshine temperature field of a highway box-shaped bridge, a finite element model is established in this paper. Some parameters which affect the temperature effect are summarized, and the influence of these parameters on the temperature effect is studied in order to provide reference for the design. The main research contents are summarized as follows: the research status of bridge sunshine temperature field is summarized. This paper introduces the basic theory of heat transfer, the process of establishing the finite element equation of temperature field and the necessary boundary conditions for solving the finite element equation. The parameters needed to establish the finite element model are consulted, the range of the parameters in the actual engineering is collected, and the values in accordance with the actual situation of the example in this paper are selected to establish the finite element model for the simulation of the example in this paper. The feasibility of the finite element model is verified by comparing the calculation results of the finite element model with the measured data. One of the parameters, such as concrete radiation coefficient, concrete thermal conductivity coefficient, latitude, day order, atmospheric transparency, convection heat transfer coefficient and asphalt pavement thickness, is selected to analyze the parameters. After calculation with finite element model, the influence of this parameter on temperature field and temperature stress is compared and evaluated, and the causes of these effects are analyzed.
【學(xué)位授予單位】:西南交通大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:U441.5
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