钢桁梁柔性拱组合体系桥节点板受力性能分析与试验研究
发布时间：2018-10-30 21:05
【摘要】：厦深客运专线榕江特大桥系主跨为(110+220+220+110m)的下承式钢桁梁柔性拱组合体系桥,其跨度在同类型桥梁中位居世界首位。该桥的节点构造形式采用了整体式节点技术,其中部分节点相交杆件多、结构和受力复杂,本文结合原铁道部科技研究开发计划项目《高速铁路桥梁技术深化研究-大跨度连续钢桁梁柔性拱组合关键技术研究》(合同号2010G004-A)要求,以厦深高铁榕江特大桥为工程背景,以该桥E11节点整体节点板为研究对象,开展其受力性能和成桥试验研究,本文主要做了以下工作： 1.分别建立了榕江特大桥E11节点整体节点板的节段模型和多尺度模型,基于两种模型对整体节点板进行受力分析,得到了较为一致的结果。 2.通过对比力边界节段模型、位移边界节段模型和多尺度模型计算结果的差异性和规律性,揭示了节点刚度的影响规律：在节点区域内多尺度模型的刚度要比梁单元模型大得多,梁单元模型的节点刚度偏小。进一步分析了这一刚度差异对节段模型计算结果的影响,并指出基于多尺度模型的节点刚度更接近真实状态、多尺度模型的计算结果更加精确。 3.为探索整体节点刚度及其模拟方法对桁架杆件内力的影响,采用多尺度模型、刚臂梁单元模型和梁单元模型3种模拟方法开展分析。计算结果：随着节点刚度的增加,杆件轴力变化不大,部分杆件轴力有略微减小,而剪力和弯矩变化较大,且基本呈增大趋势,其中以直腹杆的增幅最为显著,也导致弯矩次应力在直腹杆中的增幅较显著。同时研究了在对桁架杆件进行受力分析时,刚臂梁单元法的适用性问题,发现其计算结果较多尺度模型存在一定差异率,精度不高,但结果均偏于安全,且该方法建模简便,计算快捷,在对结构较复杂、节点整体性较强、刚度较大的桁架结构,分析杆件受力时可以考虑该方法。 4.在该桥梁的成桥试验中,选取E11节点整体节点板进行了静力试验,完成了试验测点布置、数据采集和数据分析,理论和试验结果一方面验证了该节点板设计结构的安全性,另一方面验证了本文中“多尺度模型比节段模型精度更高”等的分析结论。 本文对整体式节点的分析方法、试验手段和分析结论可供同类结构设计和计算时参考。
[Abstract]:The through steel truss beam flexible arch composite bridge with main span of 110 220 220 110m is the main span of Rongjiang super bridge in Xiamen and Shenzhen passenger dedicated line. Its span ranks first in the world in the same type of bridge. The joint structure of the bridge adopts integral joint technology, in which some of the joints have many intersecting members, and the structure and force are complex. In this paper, according to the project of the original Ministry of Railways Science and Technology Research and Development Project < High Speed Railway Bridge Technology deepening Research-Research on key Technology of large Span continuous Steel Truss girder flexible Arch combination "(contract No. 2010G004-A), Taking Rongjiang River Bridge of Xia-Shenzhen high-speed railway as the engineering background and taking the integral plate of the E11 node of the bridge as the research object, the experimental research on its mechanical performance and bridge completion is carried out. The main work of this paper is as follows: 1. The segmental model and the multi-scale model of the integral plate of the E11 node of Rongjiang Bridge are established respectively. Based on the two models, the stress of the whole plate is analyzed, and the results are consistent. 2. By comparing the force boundary segment model, the displacement boundary segment model and the multi-scale model, the difference and regularity of the calculation results are revealed, and the influence law of the node stiffness is revealed: the stiffness of the multi-scale model is much larger than that of the beam element model in the joint region. The joint stiffness of the beam element model is small. Furthermore, the effect of this stiffness difference on the results of the segmental model is analyzed, and it is pointed out that the node stiffness based on the multi-scale model is closer to the real state and the calculation result of the multi-scale model is more accurate. 3. In order to explore the influence of the stiffness of the whole node and its simulation method on the internal force of truss member, the multi-scale model, the rigid arm beam element model and the beam element model were used to analyze the internal force of truss member. The results show that with the increase of joint stiffness, the axial force of the member does not change much, while the axial force of some members decreases slightly, while the shear force and bending moment change greatly, and the increase of the straight web bar is the most significant. It also leads to a significant increase in the secondary stress of bending moment in the straight web bar. At the same time, the applicability of the rigid-arm beam element method is studied when the truss member is subjected to force analysis. It is found that there are some differences in the calculation results and the accuracy is not high, but the results are more safety and the method is simple and convenient. This method can be taken into account in the analysis of truss structures with complex structure, strong integrity of joints and large stiffness. 4. In the bridge test of the bridge, the static test is carried out by selecting the E11 node integral joint plate, and the layout of test points, data collection and data analysis are completed. On the one hand, the theory and test results verify the safety of the design structure of the joint plate. On the other hand, it verifies the conclusion that the multi-scale model is more accurate than the segmental model. In this paper, the analytical methods, test methods and conclusions of integral joints can be used for reference in the design and calculation of similar structures.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441
本文编号：2301183
[Abstract]:The through steel truss beam flexible arch composite bridge with main span of 110 220 220 110m is the main span of Rongjiang super bridge in Xiamen and Shenzhen passenger dedicated line. Its span ranks first in the world in the same type of bridge. The joint structure of the bridge adopts integral joint technology, in which some of the joints have many intersecting members, and the structure and force are complex. In this paper, according to the project of the original Ministry of Railways Science and Technology Research and Development Project < High Speed Railway Bridge Technology deepening Research-Research on key Technology of large Span continuous Steel Truss girder flexible Arch combination "(contract No. 2010G004-A), Taking Rongjiang River Bridge of Xia-Shenzhen high-speed railway as the engineering background and taking the integral plate of the E11 node of the bridge as the research object, the experimental research on its mechanical performance and bridge completion is carried out. The main work of this paper is as follows: 1. The segmental model and the multi-scale model of the integral plate of the E11 node of Rongjiang Bridge are established respectively. Based on the two models, the stress of the whole plate is analyzed, and the results are consistent. 2. By comparing the force boundary segment model, the displacement boundary segment model and the multi-scale model, the difference and regularity of the calculation results are revealed, and the influence law of the node stiffness is revealed: the stiffness of the multi-scale model is much larger than that of the beam element model in the joint region. The joint stiffness of the beam element model is small. Furthermore, the effect of this stiffness difference on the results of the segmental model is analyzed, and it is pointed out that the node stiffness based on the multi-scale model is closer to the real state and the calculation result of the multi-scale model is more accurate. 3. In order to explore the influence of the stiffness of the whole node and its simulation method on the internal force of truss member, the multi-scale model, the rigid arm beam element model and the beam element model were used to analyze the internal force of truss member. The results show that with the increase of joint stiffness, the axial force of the member does not change much, while the axial force of some members decreases slightly, while the shear force and bending moment change greatly, and the increase of the straight web bar is the most significant. It also leads to a significant increase in the secondary stress of bending moment in the straight web bar. At the same time, the applicability of the rigid-arm beam element method is studied when the truss member is subjected to force analysis. It is found that there are some differences in the calculation results and the accuracy is not high, but the results are more safety and the method is simple and convenient. This method can be taken into account in the analysis of truss structures with complex structure, strong integrity of joints and large stiffness. 4. In the bridge test of the bridge, the static test is carried out by selecting the E11 node integral joint plate, and the layout of test points, data collection and data analysis are completed. On the one hand, the theory and test results verify the safety of the design structure of the joint plate. On the other hand, it verifies the conclusion that the multi-scale model is more accurate than the segmental model. In this paper, the analytical methods, test methods and conclusions of integral joints can be used for reference in the design and calculation of similar structures.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441
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