曲线段钢—混凝土组合连续梁桥受力行为数值研究

发布时间：2018-05-13 02:32

本文选题：组合连续梁 + 细部分析　；参考：《重庆交通大学》2015年硕士论文

【摘要】：港珠澳大桥CB05标段的第一联与第二联是曲线段的钢-混凝土组合连续箱梁桥,其中平曲线半径R=5500m。曲线段施工方法采用与直线段相近的施工工艺。随着直线段的顺利完工,在总结之前施工过程中遇到的问题,考虑到曲线段受力更加复杂,而且没有现实可用的经验借鉴。不仅如此,在以桥梁整个寿命周期的综合经济效益来考虑,必须对在运营阶段中可能出现的不易处理的问题提前进行相应的数值分析,分析可能带来的影响并且提出改进的措施。本文借助于有限元软件Midas/FEA,该软件适合进行精细地有限元计算。通过模拟桥位实际温度场改变与运营期间可能出现的最不利情况进行准确地数值模拟,分别进行了组合梁桥细部与整体受力性能的分析。最后引入高性能钢材,对钢梁原设计方案进行部分修改,通过有限元分析验证其受力合理性。本文提取模型数据(理论数据)的同时,与现场的实际数据采集结果进行相应的对比分析,达到检验模型正确性与指导现场施工的目的。研究的主要内容与成果如下:①总结归纳了连续组合梁受力性能的分析理论。②对组合梁的细部进行研究,当长悬臂桥面板最外侧的应急车道出现车辆,组合梁在跨径方向上的有横向加劲肋截面与非加劲肋截面相应顶板剪力钉群的抗拔力不同,对这种情况下剪力钉的受力做初步探索分析。③针对组合梁在成桥状态下六跨一联的组合梁可能出现的偏载、温度场改变等因素引起组合梁受力的变化,分别讨论偏心荷载(活载)、温度荷载及二者的联合作用下组合梁抗扭性能并进行了详细的分析。检验目前的设计是否安全及出现问题后的对策研究。④对高性能钢材在国内外发展现状进行了总结,分析了高性能钢材的性能及其存在的问题及使用范围,开展了其在钢-混凝土组合梁中应用的初步探索。
[Abstract]:The first and second connection of the CB05 section of HongKong-Zhuhai-Macao Bridge is the steel-concrete composite continuous box girder bridge with curve section, in which the radius of the plane curve is 5500m. The construction method of curve section is similar to that of straight section. With the smooth completion of the straight line section, the problems encountered in the construction process before summing up, considering that the stress of the curve section is more complicated, and there is no practical experience to learn from it. Moreover, considering the overall economic benefits of the whole life cycle of the bridge, it is necessary to carry out corresponding numerical analysis in advance of the difficult problems that may arise in the operation phase. Analyze possible impact and propose improvement measures. In this paper, the finite element software Midas / FEAA is used, which is suitable for fine finite element calculation. By simulating the change of the actual temperature field of the bridge and the most disadvantageous situation that may occur during the operation, the detailed and integral mechanical performance of the composite girder bridge is analyzed respectively. Finally, the design scheme of steel beam is partly modified by introducing high performance steel, and its force rationality is verified by finite element analysis. This paper extracts the model data (theoretical data) at the same time, and carries on the corresponding contrast analysis with the field actual data collection result, achieves the purpose of checking the model correctness and instructing the site construction. The main contents and results of the study are as follows: 1. Summarize and summarize the analysis theory of the mechanical performance of continuous composite beam. 2 study the details of composite beam, when the vehicle appears in the outermost emergency lane of the long cantilever deck slab, In the direction of span, the uplift force of composite beam with transverse stiffened rib section is different from that of the corresponding roof shear nail group of non-stiffened rib section. This paper makes a preliminary exploration and analysis on the force of shear nail in this case .3 in view of the biasing load and the change of temperature field of the composite beam with six spans and one joint in the state of the composite beam under the condition of the bridge, the force change of the composite beam is caused by the change of the stress of the composite beam. The torsional behavior of composite beams subjected to eccentricity load (live load, temperature load and their combination) is discussed and analyzed in detail. After checking whether the current design is safe or not and the countermeasures after the problems arise, the development status of high performance steel at home and abroad is summarized, and the performance of high performance steel, its existing problems and application scope are analyzed. Its application in steel-concrete composite beams is explored.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4;U441

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