多跨悬浇PC连续刚构桥施工阶段监测与控制研究

发布时间：2018-03-21 01:24

本文选题：有限元分析　切入点：连续刚构桥　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：桥梁施工监测与控制是桥梁工程施工建设的重要组成部分。连续刚构桥的施工监测与控制是保证其结构刚度大、变形小、伸缩缝少、行车平顺舒适、抗风、抗震能力强等一系列优点的前提。同时,由于连续刚构桥施工监测与控制的理论计算分析与实际数据之间的偏差具有累积性。施工阶段若不及时进行有效的控制、纠偏与调整,随悬臂施工主梁节段的增加,主梁的标高和线形会越来越偏离设计预期值。因此,为达到理想的成桥状态,必须从施工一开始时就进行实时动态的施工监控和纠偏调整。首先,本文对PC连续箱梁桥的国内外发展历程做简要叙述,并对PC连续箱梁桥施工中力学参数选取、标高影响因素、测量误差等进行了分析。同时又对目前PC连续刚构桥施工监测与控制的“灰色理论”和“Kalman滤波理论”进行对比介绍,并分析其优劣。第二,本文采用空间三维有限元分析软件Midas civil,依据多跨PC连续刚构桥—胡家沟1号大桥(45+3×80+45)建立空间三维有限元分析模型。结合施工设计文件和悬臂现场特点,分别建立PC连续刚构桥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。并对如何提高空间有限元分析模型计算参数的准确性、真实性进行深入分析,确保有限元模型真实可靠。第三,针对PC连续刚构桥现场施工监测控制的两大方面—应力监测和线形监控,提出了比较完善的现场监控体系,对影响PC连续刚构桥施工监测与控制的准确性因素进行了分析。同时,比较Midas civil理论计算数据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悬臂阶段施工标高与线形的方法,为胡家沟1号大桥的顺利合龙做出了巨大贡献。第四,本文将MIDAS civil计算的理论分析数据与施工阶段中立模标高数据、预拱度设置、温度影响、管道摩阻试验、有效应力损失等数据进行对比分析。经过数据的整理,施工监测控制理论对比、预拱度分配曲线比较,然后结合PC连续刚构桥的工程实例,认识到“灰色理论和Kalman滤波理论”相结合能更好地进行PC连续刚构桥悬臂施工的监测与控制。同时也指出预拱度分配时余弦曲线优于公式经验曲线。这些均为更好的指导PC连续刚构桥悬臂施工,保证施工质量以及后期使用寿命提供了帮助。
[Abstract]:Bridge construction monitoring and control is an important part of bridge construction construction. Continuous rigid frame bridge construction monitoring and control is to ensure that its structure stiffness is large, deformation is small, expansion joints are less, driving smooth and comfortable, wind resistance, At the same time, because the deviation between the theoretical calculation and analysis of continuous rigid frame bridge construction monitoring and control and the actual data is cumulative, if the effective control is not carried out in time in the construction stage, the deviation will be corrected and adjusted. With the increase of the section of cantilever construction main beam, the elevation and alignment of main beam will deviate more and more from the expected design value. Therefore, in order to achieve the ideal bridge state, real-time and dynamic construction monitoring and correction adjustment must be carried out from the beginning of construction. In this paper, the development of PC continuous box girder bridge at home and abroad is briefly described, and the selection of mechanical parameters and the influencing factors of elevation in the construction of PC continuous box girder bridge are also discussed. At the same time, the "grey theory" and "Kalman filter theory", which are used to monitor and control the construction of PC continuous rigid frame bridge, are compared and introduced, and their advantages and disadvantages are analyzed. In this paper, the three-dimensional finite element analysis model of space is established by using the three-dimensional finite element analysis software Midas civil and the multi-span PC continuous rigid frame bridge Hujiagou No. 1 Bridge (45.3 脳 8045). The analysis models of beam section construction, prestress tensioning and hanging basket movement in the cantilever construction of PC continuous rigid frame bridge are established, and how to improve the accuracy and authenticity of the calculation parameters of the spatial finite element analysis model is analyzed. To ensure that the finite element model is true and reliable. Thirdly, aiming at the two aspects of monitoring and control of PC continuous rigid frame bridge construction in situ-stress monitoring and linear monitoring, a relatively perfect field monitoring system is put forward. The factors influencing the accuracy of construction monitoring and control of PC continuous rigid frame bridge are analyzed. At the same time, the differences between the calculated data of Midas civil theory and the actual construction data are compared. The method of continuously adjusting the construction monitoring parameters to control the elevation and alignment of the cantilever construction is put forward, which has made a great contribution to the successful closure of Hujiagou No. 1 Bridge. 4th, In this paper, the theoretical analysis data of MIDAS civil calculation are compared with those of vertical formwork elevation data, pre-camber setting, temperature effect, pipe friction test, effective stress loss and so on. The comparison of construction monitoring and control theory, the comparison of pre-arch distribution curve, and the engineering example of PC continuous rigid frame bridge, It is recognized that the combination of "grey theory and Kalman filtering theory" can better monitor and control the cantilever construction of PC continuous rigid frame bridge. At the same time, it is pointed out that the cosine curve of pre-arch distribution is superior to the empirical curve of formula. Good guidance PC continuous rigid frame bridge cantilever construction, Guarantee construction quality and later service life to provide help.
【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;U448.23

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