连续箱形梁桥施工监控仿真与局部应力分析

发布时间：2018-02-27 10:38

本文关键词： 连续箱形梁桥仿真分析施工监控局部应力分析　出处：《扬州大学》2014年硕士论文　论文类型：学位论文

【摘要】：预应力混凝土连续梁桥以其结构受力性能好、变形小、伸缩缝少、行车平顺舒适、造型简洁美观、养护工程量少、抗震能力强等特点而成为最富有竞争力的主要桥型之一。预应力混凝土连续箱梁桥经常采用悬臂浇筑法施工,其施工难度大,过程复杂,对大跨度桥梁进行施工监测与控制是确保成桥状态符合设计要求的重要措施,同时也是保证施工质量和施工安全的重要的环节。本文以盐邵河大桥主桥为工程背景,主要完成了以下内容： (1)简要介绍了连续梁桥的发展现状和受力特点,以及国内外施工监控的意义、内容和发展现状。 (2)对连续箱形梁桥施工监控仿真过程中的相关理论进行了简要的介绍,主要包括仿真计算方法和有限元理论。 (3)针对盐邵河大桥的施工过程,运用有限元软件Midas/civil建立全桥施工仿真分析模型,给出最大悬臂状态和成桥状态的位移、内力和应力的情况,并对比它们之间的差异。 (4)对桥梁施工现场监控方案(包括线形和内力)进行了简要介绍,在线形监控方面给出了最大悬臂状态和成桥状态的高程变化情况,在应力监测方面给出了几个关键截面的控制应力,并将现场实测值与理论值进行对比分析。 (5)运用ABAQUS有限元软件建立0#块局部实体模型,给出了0#块的最大悬臂状态和成桥状态的顶板、底板、腹板和横隔板的应力分布情况,指出了拉应力较大的部位和应力集中的部位。分析结果表明：采用Midas/civil对施工过程进行有限元分析对施工监控具有借鉴和指导作用,验证了施工监控实测值与理论值基本符合。从采用ABAQUS对0#块的分析结果可以看出在顶板与横隔板连接处、底板与横隔板连接处以及腹板与顶板的连接处都出现了不同程度的拉应力,容易出现裂缝,施工过程中要采取措施加以预防。
[Abstract]:The prestressed concrete continuous beam bridge has the advantages of good mechanical performance, small deformation, less expansion joints, smooth and comfortable driving, simple and beautiful shape, and less maintenance works. The prestressed concrete continuous box girder bridge is often constructed by cantilever pouring method, which is difficult and complex. Monitoring and controlling the construction of long-span bridges is an important measure to ensure that the state of the bridge meets the design requirements, and is also an important link to ensure the construction quality and construction safety. This paper takes the main bridge of Yanshao River Bridge as the engineering background, mainly completes the following contents:. This paper briefly introduces the development status and mechanical characteristics of continuous beam bridges, as well as the significance, content and development status of construction monitoring at home and abroad. This paper briefly introduces the related theories of continuous box girder bridge construction monitoring and simulation process, mainly including the simulation calculation method and the finite element theory. In view of the construction process of Yanshao River Bridge, the finite element software Midas/civil is used to establish the simulation analysis model of the whole bridge construction. The displacement, internal force and stress of the maximum cantilever state and the bridge state are given, and the differences between them are compared. In this paper, the monitoring scheme of bridge construction site (including linear and internal force) is briefly introduced, and the height variation of the maximum cantilever state and bridge state is given in the aspect of linear monitoring. In the aspect of stress monitoring, the control stress of several key sections is given, and the field measured value is compared with the theoretical value. The local solid model of 0# block is established by using ABAQUS finite element software, and the stress distribution of roof, bottom plate, web plate and transverse partition of the largest cantilever state and bridge state of 0# block is given. The positions where the tensile stress is high and where the stress is concentrated are pointed out. The results show that the finite element analysis of the construction process by using Midas/civil can be used for reference and guidance in construction monitoring. It is verified that the measured value of construction monitoring is basically consistent with the theoretical value. From the analysis of the block of 0# by using ABAQUS, it can be seen that there is a connection between the roof and the transverse partition. The connection between the bottom plate and the transverse partition and the connection between the web and the roof have different degrees of tensile stress, which are apt to appear cracks, and some measures should be taken to prevent them in the process of construction.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445

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