基于线形应力双控最小二乘法的桥梁施工控制方法研究

发布时间：2018-07-10 03:54

本文选题：连续箱梁桥 + 仿真分析　；参考：《广西大学》2015年硕士论文

【摘要】：近些年来,随着对交通基础设施建设的重视,我国的桥梁建设事业也得到了蓬勃发展,桥梁建设水平及施工工艺控制也取得了长足的进步。大跨度预应力混凝土连续箱梁桥由于它独有的优点被而被人们广泛采用。然而随着桥梁跨径越来越大,结构越来越复杂,施工难度也在增大。再利用悬臂施工法进行桥梁施工过程中,随机误差和系统误差是不可避免的,并将随着悬臂梁段的增加而不断累积。如果不对此进行误差分析及线形修正,最终将导致桥梁线形偏离理论设计状态,导致合龙困难,并且已经建成的悬臂段的线形在施工后期是不可调节的,因此必须在桥梁施工过程中必须对施工监控工作给予相当的重视。本文主要介绍了大跨度预应力混凝土箱梁桥结构的发展情况和研究概况,以及施工监控的基本内容和施工控制的一般方法和步骤。主要内容是以钦江大桥为工程实践案例,对该种类型桥梁的施工监控方法进行研究；利用桥梁有限元软件Midas Civil2012进行结构仿真分析,得到理论计算值,并与实测值进行了对照分析；针对该类型桥梁结构进行了参数敏感性分析,确定了结构设计中的主要设计参数,并根据实际情况进行反馈控制分析来调整计算参数。在线形和应力预测方面,本文对比了理论值和实测值的差异,介绍了最小二乘法的基本原理和公式推导过程。在线形控制为主的同时,同时注重对桥梁应力的监控。因此对最小二乘法进行改进,采用线形和应力进行双控来预测立模标高,以便指导实际桥梁施工,取得了良好的效果,保证了桥梁在施工后期能够顺利合龙。
[Abstract]:In recent years, with the attention paid to the construction of transportation infrastructure, the construction of bridges in our country has been flourishing, and the level of bridge construction and the control of construction technology have also made great progress. Long-span prestressed concrete continuous box girder bridge is widely used because of its unique advantages. However, as the span of the bridge becomes larger and larger, the structure becomes more and more complicated and the construction difficulty increases. In the process of bridge construction using cantilever construction method, random error and systematic error are inevitable, and will accumulate with the increase of cantilever beam section. If the error analysis and alignment correction are not carried out, the alignment of the bridge will deviate from the theoretical design state, resulting in the closure difficulty, and the alignment of the cantilever section that has been built will not be adjustable in the later stage of construction. Therefore, the construction monitoring work must be paid more attention in the process of bridge construction. This paper mainly introduces the development and research situation of long-span prestressed concrete box girder bridge structure, as well as the basic content of construction monitoring and the general methods and steps of construction control. The main content of this paper is to study the construction monitoring method of this type of bridge with Qinjiang Bridge as a practical case, and to obtain the theoretical calculation value by using the bridge finite element software Midas Civil 2012 to carry out structural simulation analysis. The parameter sensitivity analysis of the bridge structure is carried out, the main design parameters are determined, and the calculation parameters are adjusted by feedback control analysis according to the actual situation. In the aspect of linear and stress prediction, the difference between the theoretical value and the measured value is compared, and the basic principle of the least square method and the derivation process of the formula are introduced. At the same time, it pays attention to the monitoring of bridge stress. Therefore, the least square method is improved to predict the elevation of vertical formwork by double control of linear shape and stress, so as to guide the actual bridge construction and obtain good results, and ensure that the bridge can close smoothly in the later stage of construction.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4

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