预应力混凝土连续梁桥施工阶段受力分析研究

发布时间：2019-05-28 12:01

【摘要】：PC连续箱梁桥具有结构刚度大、变形小、伸缩缝少,以及抗风、抗震能力强、后期养护简单等一系列优点,广泛用于公路交通中。随着高强材料和挂篮悬臂施工的发展,PC连续箱梁桥也广泛用于铁路建设中。同时,随着Midas Civil、ABAQUS 6.12等有限元软件的兴起,结构电算的速度和精度越来越高,还可通过有限元模拟与桥梁结构相对应的施工阶段、整体线形和应力分析、截面受力分析等。为PC连续箱梁桥的施工监测控制提供了巨大的帮助。但是,由于桥梁工程施工过程的不可逆性。并且,施工过程中理论计算结果与实际测量数据都会存在差异。这都要求技术人员要理论与实际相结合,做好桥梁结构施工过程中的线形和应力的监测与控制工作。本文结合白腊寨一号四线桥(32+48+32m连续梁),应用有限元分析软件Midas Civil和ABAQUS 6.12,对桥梁进行整体结构受力分析、线形分析、主要控制截面应力分析、0号块最大悬臂阶段受力分析等工作。并将计算结果运用于桥梁施工监测控制。同时,本文还对以下内容做了分析:(1)对PC连续箱梁桥的特征及其发展历程做简要叙述,分析了目前桥梁施工监测控制理论和施工方法,并比较其优劣特点。(2)采用有限元软件Midas Civil,依据白腊寨一号四线桥(32+48+32 m)建立空间三维有限元模型。结合施工设计文件和现场工程特点,建立悬臂施工中梁段浇筑、预应力张拉、挂篮移动等阶段的分析模型,对如何提高有限元模型计算的准确性、真实性进行深入的分析。(3)运用有限元软件ABAQUS 6.12,采用内力、位移相结合的加载方法对桥梁0号块进行局部受力分析。分别对0号块的最大悬臂状态下箱型截面局部受力、以及可能出现裂缝的形态、对应裂缝成因等进行了分析。(4)运用Midas Civil对悬臂施工中的挂篮及构件进行强度、刚度和稳定性分析、不同荷载组合作用下安全系数分析和结构受力分析。(5)针对PC连续梁桥现场施工监测控制的两大内容——应力监测和线性监控,提出比较完善的现场监控体系。并且还对影响PC连续梁桥施工监测与控制准确性的因素进行分析,比较理论计算结果与实际施工数据之间的差异,提出通过不断调整施工监控参数来控制挂篮悬臂阶段施工的方法,为白腊寨一号四线桥的顺利合拢做出了巨大贡献,并为更好的指导连续梁桥的施工监控提供一定的帮助。
[Abstract]:PC continuous box girder bridge has a series of advantages, such as large structural stiffness, small deformation, less expansion joints, wind resistance, strong seismic capacity, simple later maintenance and so on. It is widely used in highway traffic. With the development of high strength materials and hanging basket cantilever construction, PC continuous box girder bridge is also widely used in railway construction. At the same time, with the rise of Midas Civil,ABAQUS 6.12 and other finite element software, the speed and accuracy of structural computer calculation are getting higher and higher, and the overall alignment and stress analysis can also be carried out through the finite element simulation of the construction stage corresponding to the bridge structure. Force analysis of cross section, etc. It provides great help for the construction monitoring and control of PC continuous box girder bridge. However, due to the irreversibility of the construction process of bridge engineering. Moreover, there will be differences between the theoretical calculation results and the actual measurement data in the construction process. This requires technicians to combine theory with practice and do a good job in the monitoring and control of alignment and stress in the process of bridge structure construction. In this paper, combined with Bailazhai No. 1 fourth Line Bridge (324832m continuous beam), the finite element analysis software Midas Civil and ABAQUS 6.12 are used to analyze the stress of the whole structure of the bridge, the linear analysis and the stress analysis of the main control section. The force analysis of the maximum cantilever stage of block 0 is carried out. The calculation results are applied to bridge construction monitoring and control. At the same time, this paper also analyzes the following contents: (1) the characteristics and development course of PC continuous box girder bridge are briefly described, and the current bridge construction monitoring and control theory and construction method are analyzed. (2) the finite element software Midas Civil, is used to establish the spatial three-dimensional finite element model based on the fourth line bridge of Bailazhai No. 1 (324832 m). According to the construction design documents and the characteristics of field engineering, the analysis models of beam section pouring, prestress tension and hanging basket movement in cantilever construction are established, and how to improve the accuracy of finite element model calculation is established. The authenticity is analyzed deeply. (3) the local force of No. 0 block of bridge is analyzed by using the finite element software ABAQUS 6.12 and the loading method of internal force and displacement. The local force of box section under the maximum cantilever state of block 0, the shape of possible cracks and the causes of corresponding cracks are analyzed respectively. (4) the strength of hanging basket and components in cantilever construction is carried out by using Midas Civil. Stiffness and stability analysis, safety factor analysis and structural stress analysis under different load combinations. (5) stress monitoring and linear monitoring are two main contents of field construction monitoring and control of PC continuous beam bridge. A relatively perfect field monitoring system is put forward. The factors that affect the accuracy of construction monitoring and control of PC continuous beam bridge are also analyzed, and the differences between the theoretical calculation results and the actual construction data are compared. This paper puts forward the method of controlling the cantilever stage of hanging basket by constantly adjusting the construction monitoring parameters, which makes a great contribution to the smooth closure of Bailazhai No. 1 fourth Line Bridge, and provides some help for better guiding the construction monitoring of continuous beam bridge.
【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

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