預(yù)應(yīng)力混凝土連續(xù)梁橋施工階段受力分析研究
[Abstract]:PC continuous box girder bridge has a series of advantages, such as large structural stiffness, small deformation, less expansion joints, wind resistance, strong seismic capacity, simple later maintenance and so on. It is widely used in highway traffic. With the development of high strength materials and hanging basket cantilever construction, PC continuous box girder bridge is also widely used in railway construction. At the same time, with the rise of Midas Civil,ABAQUS 6.12 and other finite element software, the speed and accuracy of structural computer calculation are getting higher and higher, and the overall alignment and stress analysis can also be carried out through the finite element simulation of the construction stage corresponding to the bridge structure. Force analysis of cross section, etc. It provides great help for the construction monitoring and control of PC continuous box girder bridge. However, due to the irreversibility of the construction process of bridge engineering. Moreover, there will be differences between the theoretical calculation results and the actual measurement data in the construction process. This requires technicians to combine theory with practice and do a good job in the monitoring and control of alignment and stress in the process of bridge structure construction. In this paper, combined with Bailazhai No. 1 fourth Line Bridge (324832m continuous beam), the finite element analysis software Midas Civil and ABAQUS 6.12 are used to analyze the stress of the whole structure of the bridge, the linear analysis and the stress analysis of the main control section. The force analysis of the maximum cantilever stage of block 0 is carried out. The calculation results are applied to bridge construction monitoring and control. At the same time, this paper also analyzes the following contents: (1) the characteristics and development course of PC continuous box girder bridge are briefly described, and the current bridge construction monitoring and control theory and construction method are analyzed. (2) the finite element software Midas Civil, is used to establish the spatial three-dimensional finite element model based on the fourth line bridge of Bailazhai No. 1 (324832 m). According to the construction design documents and the characteristics of field engineering, the analysis models of beam section pouring, prestress tension and hanging basket movement in cantilever construction are established, and how to improve the accuracy of finite element model calculation is established. The authenticity is analyzed deeply. (3) the local force of No. 0 block of bridge is analyzed by using the finite element software ABAQUS 6.12 and the loading method of internal force and displacement. The local force of box section under the maximum cantilever state of block 0, the shape of possible cracks and the causes of corresponding cracks are analyzed respectively. (4) the strength of hanging basket and components in cantilever construction is carried out by using Midas Civil. Stiffness and stability analysis, safety factor analysis and structural stress analysis under different load combinations. (5) stress monitoring and linear monitoring are two main contents of field construction monitoring and control of PC continuous beam bridge. A relatively perfect field monitoring system is put forward. The factors that affect the accuracy of construction monitoring and control of PC continuous beam bridge are also analyzed, and the differences between the theoretical calculation results and the actual construction data are compared. This paper puts forward the method of controlling the cantilever stage of hanging basket by constantly adjusting the construction monitoring parameters, which makes a great contribution to the smooth closure of Bailazhai No. 1 fourth Line Bridge, and provides some help for better guiding the construction monitoring of continuous beam bridge.
【學(xué)位授予單位】:重慶交通大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:U445.4
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