| The structure of Rongjiang River Bridge in Xiamen-Shenzhen Railway, which is composed of steel through truss with flexible arch and has main spans of110+2×220+110meters, is the longest of its type in the world. The bridge of joints uses the integral joint structure form, which has more intersects rods and are more complex in structure and stress performance. In this paper, combined with the former Ministry of Railway Science and Technology Research and Development Program High Speed Railway Bridge Technology Deepening Research-Flexible Long-Span Continuous Steel Truss Beam Arch Combination Key Technology Research (Contract Number2010G004-A), with the engineering background of Rongjiang River Bridge, Ell integral joint plate was deeply studied, and its stress performance and experimental research of the bridge is also considered. The main work and contribution of this paper are as follows:1. Sectional finite element model and Multi-scale finite element model were established of E11integral joint plate on the Rongjiang River Bridge, and were analyzed for the stress performance, which attains consistent results.2. It revealed the influence of joint stiffness:the stiffness of multi-scale model was much greater than the stiffness of the beam element model of the area within the joint, and the stiffness of joint beam element model was smaller by comparing the results of the force boundary section model, displacement boundary section model and multi-scale model differences and regularity. Further analysis of the impact of the differences in segmental stiffness model results was performed in this paper and noted that closer to the real state joint stiffness based multi-scale model, the results of multi-scale model is more accurate.3. To explore the integral joint stiffness and simulation methods on the truss member forces, the use of multi-scale model, rigid arm beam element model and beam element model three kinds of simulation methods to carry out the analysis. The results shows that:with the increase of joint stiffness, the axial force rod changed little, and the rod portion of the axial force slightly decreased, while the shear and bending moment changed greatly, with substantially increasing trend, and the most significant increase of straight webs also led to a more significant increase in secondary stress in straight webs This paper also studied the applicability of rigid arm beam when analyzing the stress performance of truss rod, the results found that there were some large differences in the rate of scale models, and its accuracy was not high, but the results were somewhat safe, and the modeling method was simple, quick calculation, the structure was more complex, holistic joint strong rigidity larger truss structure, the method could be considered when analyzing the force rod.4. E11integral joint plate was selected to carry out static loading test in the experimental built bridge. And we completed the arrangement of test measuring sensor, data collection and data analysis. Theoretical and experimental results on the one hand verified the safety of the structure of the joint plate design, on the other hand validated the analytical conclusions in this paper such as "multi-scale model is higher accuracy than the section model".The analysis method, test means and conclusions of integral joint plate in this paper are available for reference when similar structures are designed and calculatied.The paper contains135images,28tables and51... |
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