雙層交通混凝土箱梁傳力路徑試驗(yàn)研究與分析
[Abstract]:The new structural form of prestressed concrete box beam facing double layer traffic is an ideal form to realize double layer traffic of urban bridge. In this paper, combined with the project of National Natural Science Foundation of China-study on the stress mechanism and design method of double-layer traffic concrete box girder (Project Grant No. 51378202), the force transfer path of the double-layer traffic box girder test model is studied emphatically. The main work of this paper is as follows: (1) the single point loading (six working conditions) and combined loading (six working conditions) of the roof of the box girder model in the elastic range are studied. The deflection and strain changes of the three control sections of the box beam model, as well as the local deflection and strain of the plate and stiffened ribs under single point loading are measured. (2) the material parameters and element types are reasonably selected. The numerical model of double-layer traffic box girder is established by finite element method (ABAQUS), and the test conditions are simulated. The analysis data are compared with the experimental data, and the analysis results are in good agreement with the test results. The reasonable feasibility of the numerical model is verified. (3) on the basis of the reasonable and feasible numerical model, the loading positions of the four working conditions in the combined loading of roof are adjusted to the corresponding positions of the floor plate for analysis. Compared with the analysis results of roof loading, it is found that the whole change law of them is basically the same. (4) using rigid beam method, transverse rigid beam method and displacement deflection method to calculate the lateral distribution coefficient of joint loading. Based on the comparison with the numerical results, the transverse distribution law of the joint loading is obtained by modifying the transverse rigid beam method, and the load transfer path of the box beam model is basically obtained.
【學(xué)位授予單位】:湖南科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:U441
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