大跨度高墩连续刚构桥的稳定性分析和施工监控

发布时间：2018-07-20 19:47

【摘要】：论文依据有限元分析的方法以新建铁路麟游矿区至宝鸡二电厂铁路专用线路上的川口河特大桥（53.15+385+53.15）m为工程背景，用专业的大型桥梁有限元软件MIDAS/CIVIL对该大跨度高墩连续刚构桥建立有限元模型，探讨了桥梁结构的几何非线性分析方法和求解方法。重点分析研究了在施工阶段及使用阶段该大跨度高墩连续刚构桥的受力情况及稳定性，论文还研究分析了该桥梁的施工监控，讨论了在施工过程中对该桥梁的线形和应力的监控。最后得出了连续刚构桥的稳定系数及施工监控结论。以连续刚构桥为例，论文首先讨论在两种荷载作用下，即纵向风荷载、横向风载下桥墩的自体稳定性。接着讨论了桥梁在施工的最不利阶段，即在最大悬臂状态下、在风载作用下、挂蓝正常工作及跌落时桥梁的稳定性。最后讲述了桥梁在建成以后，在动荷载对各跨的作用下，并考虑牵引力或制动力的作用下全桥的稳定性。通过这些分析可以看出，在最大悬臂状态时，尤其是挂蓝不能正常工作时，桥梁的稳定性最差。在成桥以后桥梁的整体稳定性提高，这是因为成桥以后桥梁的整体联系加强。应特别注意在施工过程中最大悬臂状态时及挂蓝的稳定性，成桥后，，加载应尽量保持对称均衡性，确保桥梁的稳定性。由于在荷载组合1的作用下及全桥满载时桥梁的稳定性较差，所以选择这两个阶段做该桥的非线性分析，可以得出非线性分析的稳定性下降，但总体满足稳定性的设计要求。论文最后一章分析了施工监控的意义、必要性、内容及方法，并以川口河大桥的为例对桥梁的施工监控进行了详细的说明，详细列出了在各个施工过程中桥梁的累计位移和累计应力。最后得出由于施工监控技术的应用，此桥的在施工过程及成桥后，桥梁的线形、应力的偏差都在合理的范围之中，各项指标都满足设计的要求。
[Abstract]:Based on the finite element analysis method, the paper takes Chuankou River Bridge (53.15 385 53.15) m as the engineering background. The finite element model of the long-span continuous rigid frame bridge with high piers is established with Midas / CIVIL, a professional finite element software of bridge, and the geometric nonlinear analysis method and solution method of bridge structure are discussed. The stress and stability of the long-span and high-pier continuous rigid frame bridge in the construction stage and the use stage are analyzed, and the construction monitoring of the bridge is also studied and analyzed in this paper. The monitoring of the line shape and stress of the bridge during construction is discussed. Finally, the stability coefficient and construction monitoring conclusion of continuous rigid frame bridge are obtained. Taking continuous rigid frame bridge as an example, this paper first discusses the self-stability of piers under two kinds of loads, that is, longitudinal wind load and transverse wind load. Then it discusses the most disadvantageous stage of the bridge construction, that is, under the maximum cantilever state, under the action of wind load, the stability of the bridge under the normal operation of the hanging blue and when the bridge falls. Finally, the stability of the bridge under the action of dynamic load on each span and considering the action of traction or braking force is discussed. Through these analyses, it can be seen that the stability of the bridge is the worst in the maximum cantilever state, especially when the hanging blue can not work properly. The overall stability of the bridge is improved after the completion of the bridge, which is due to the strengthening of the overall connection of the bridge after the completion of the bridge. Special attention should be paid to the stability of the maximum cantilever state and the hanging blue in the construction process. After the completion of the bridge, the load should be kept symmetrical and balanced as far as possible to ensure the stability of the bridge. Because of the poor stability of the bridge under the action of the load combination 1 and the full load of the whole bridge, the nonlinear analysis of the bridge in these two stages can be concluded that the stability of the nonlinear analysis decreases, but the overall stability meets the design requirements of the stability. In the last chapter of the paper, the significance, necessity, content and method of construction monitoring are analyzed, and the construction monitoring of Chuankouhe River Bridge is explained in detail, taking Chuankouhe River Bridge as an example. The accumulative displacement and stress of each bridge are listed in detail. Finally, due to the application of construction monitoring technology, the line shape and stress deviation of the bridge in the construction process and after the completion of the bridge are in a reasonable range, each index meets the requirements of the design.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4;U448.23

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