高墩大跨度曲线连续刚构桥结构静力与稳定特性分析

发布时间：2018-03-09 05:36

本文选题：曲线梁桥　切入点：高墩高度　出处：《长沙理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：从改革开放三十多年以来,随着我国的综合国力不断的日益壮大时,国内的城市化与交通基础建设也得到了突飞猛进的发展,在建设开发西部山区和城市化进程过程中,为了使驾驶员在行车中舒适、安全,以及道路线形与环境能够得到相匹配、相适应来达到减少在弯道处的交通事故等等,高墩预应力混凝土曲线连续刚构桥越来越得到工程的实际运用,其引起的社会效益是不可估计的。相对直线桥而言,高墩预应力混凝土曲线连续刚构桥的结构存在弯扭耦合作用,从而在受力与变形两种特性上表现出非常复杂的特点,特别是在西部山区里弯桥和城市的立交桥,基本均具备了墩高及结构弯的两大特点,更近一步为了确保交通安全,克服山区里的弯桥和城市立交桥的“高、弯”两大特点所带来的隐患,对高墩大跨度曲线连续刚构桥的受力性能与变形特性的深刻研究是迫在眉睫的,然研究结果即对实际工程中在施工和设计中能提供坚强的技术保障,帮助大家更加深入了解曲线梁桥的相关特性。首先,介绍高墩曲线桥梁发展史及对它的研究现状,和曲线梁桥的基本理论计算及影响结构特性的因素。其次,以桂林荔浦西牛大桥为工程实例,通过MIDAS有限元分析软件进行建立模型,并计算分析了此桥成桥状态后在自重荷载、二期恒载、预应力张拉、系统整体升温作用下内力状态及变形的影响。在工况A作用下通过改变高墩墩高参数来分析对结构的受力与变形的规律,对比分析了曲线连续刚构桥其边墩与主梁在固结或简支两种情况下时在以上四种工况作用下对结构的受力与变形的影响,同时对最大悬臂T型悬臂梁两端同时对称施工与两端有先后顺序施工两种情况的弹性稳定性(即竖向位移)进行对比分析。最后,对本课题的研究做出相应的总结,可知高墩大跨度曲线连续刚构桥在自重荷载、二期恒载、预应力张拉、系统整体升温下的内力和变形情况,也可知道参数墩高和边墩与主梁固结或简支两种状态对曲线梁桥的影响情况,通过对最大悬臂T型悬臂梁的弹性稳定性研究可知在挂篮施工中应两端同时进行方最安全。
[Abstract]:Since the reform and opening up for more than 30 years, with the growing comprehensive national strength of our country, the urbanization and transportation infrastructure in China have also been developed by leaps and bounds. In the process of construction and development of western mountainous areas and urbanization process, In order to make the driver comfortable and safe while driving, and to match the road alignment with the environment, so as to reduce the traffic accidents at the bend, etc., Prestressed concrete curved continuous rigid frame bridges with high piers have been applied more and more in practice, and the social benefits caused by them are inestimable. The structure of prestressed concrete curved continuous rigid frame bridge with high piers is coupled with bending and torsion, which shows very complex characteristics in two characteristics of force and deformation, especially in the mountain area of the west and the overpass of the city. In order to ensure the safety of traffic and overcome the hidden trouble brought by the two characteristics of the curved bridge in the mountain area and the "high and curved" bridge in the city, they all have the characteristics of the pier height and the structural bend, and in order to ensure the traffic safety, It is urgent to study the mechanical performance and deformation characteristics of the curved continuous rigid frame bridge with high piers and large span, but the research results can provide a strong technical guarantee for the construction and design of practical projects. It helps us to understand the related characteristics of curved girder bridge more deeply. Firstly, it introduces the history of development of curved bridge with high piers and its research status, and the basic theoretical calculation of curved girder bridge and the factors affecting the structural characteristics. Taking Lipu Xiniu Bridge in Guilin as an engineering example, the model is established by MIDAS finite element analysis software, and the dead load, the second stage dead load, the prestress tensioning of the bridge are calculated and analyzed after the completion of the bridge. Under the action of working condition A, the stress and deformation of the structure are analyzed by changing the parameters of the high pier. The influence of the side pier and the main beam of the curved continuous rigid frame bridge on the stress and deformation of the structure under the above four working conditions under the condition of consolidation or simply supported are compared and analyzed. At the same time, the elastic stability (i.e. vertical displacement) of the maximum cantilever T-shaped cantilever beam under the two conditions of simultaneous symmetrical construction at both ends and sequential construction at both ends is compared and analyzed. Finally, a corresponding summary of the research on this subject is made. It is known that the internal force and deformation of the curved continuous rigid frame bridge with high piers and large span under the deadweight load, the second stage dead load, the prestress tensioning, and the whole system heating up, It is also possible to know the influence of the parameter pier height and the consolidation or simply supported state of the side pier with the main beam on the curved beam bridge. Through the study of the elastic stability of the maximum cantilever T-shaped cantilever beam, it is concluded that the safest side should be carried out simultaneously at both ends in the construction of the hanging basket.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.23

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