郑万铁路尼尔森体系钢管混凝土拱桥施工监控及吊杆张拉控制优化研究
发布时间：2018-07-21 11:36
【摘要】：随着拱桥在我国高速铁路修建中的迅猛发展,尼尔森体系钢管混凝土拱桥由于其整体刚度大、外形美观、经济效益好、安全可靠、跨越能力强等优越性受到铁路建设者的热捧。为了避免在桥梁建造过程中出现结构垮塌等重大责任事故,保证结构施工质量,尽可能完美地实现设计意图,国家相关部门对技术含量高的桥梁建设引入了第三方进行施工过程监控。国内、外桥梁施工监控大多是针对大跨度斜拉桥、连续刚构桥等桥型,而针对尼尔森体系钢管混凝土拱桥的施工监控方面,缺乏比较系统性、有针对性的施工监控技术措施和建设实践。本文结合尼尔森体系钢管混凝土拱桥的起源和国内外发展状况,介绍了该种桥梁结构的特点,以正在建设中的郑万铁路128m尼尔森体系钢管混凝土拱桥为研究对象,主要做了如下几方面的工作:1.利用有限元软件Midas/civil建立起三维杆系结构仿真模型,模拟了全桥各个施工阶段,并对拱桥关键结构的建模方法做出详细总结;2.编制了全面的施工控制方案,介绍了各个阶段测量和监控的技术关键点,特别介绍了对支架监控的新的技术手段,从而保证了主梁浇筑支架体系的结构安全;3.利用最小二乘原理结合倒装分析法进行控制参数的误差识别。通过举例分析,对比参数真实值与参数修正值的符合度,验证了对参数进行修正后,能够得到高精度的参数估计值。因而在施工过程中通过参数识别修正,建立起更加符合实际工程的有限元计算模型,能够更好的指导施工有序进行;4.在有限元模型更加符合现场实际的基础上,分别运用影响矩阵法和倒装法确定吊杆初张拉力,介绍了两种方法的计算原理和过程,提出了两种方法均以吊杆索力设计值为控制目标,兼顾结构的变形和内力。通过两种方法在不同张拉方案中的应用发现:将影响矩阵法和正装迭代分析相结合,在确定吊杆初拉力方面具有更大的优势。5.针对不同的吊杆张拉顺序,利用影响矩阵法结合迭代分析,计算合理的吊杆初始张拉力,再进行正装分析,选择符合现场实际、易于实施的吊杆张拉方案。本文通过对尼尔森体系钢管混凝土拱桥施工控制的研究,为该桥成桥状态尽可能接近设计状态奠定理论基础,可为同类型拱桥的施工监控提供借鉴。
[Abstract]:With the rapid development of arch bridge in the construction of high-speed railway in our country, Nielsen system concrete filled steel tube arch bridge is popular with railway builders because of its advantages such as large stiffness, beautiful appearance, good economic benefit, safety and reliability, strong span ability and so on. In order to avoid major accidents such as structural collapse in the process of bridge construction, to ensure the construction quality of the structure, and to realize the design intention as perfectly as possible, The relevant departments of the state have introduced a third party to monitor the construction process of the high-tech bridge construction. In China, the construction monitoring of external bridges is mostly aimed at long-span cable-stayed bridges, continuous rigid frame bridges and other bridge types, but for Nielsen system concrete filled steel tube arch bridge construction monitoring, there is a lack of systematic, Targeted construction monitoring technical measures and construction practice. Combined with the origin of Nielsen system concrete-filled steel tube arch bridge and the development situation at home and abroad, this paper introduces the characteristics of the bridge structure, taking the 128m concrete filled steel tube arch bridge of Zhengwan-Wan railway as the research object. I mainly did the following work: 1. By using the finite element software Midas / civil, the simulation model of 3D bar structure is established, the construction stages of the whole bridge are simulated, and the modeling method of the key structure of the arch bridge is summarized in detail. The overall construction control scheme is worked out and the key points of measurement and monitoring in each stage are introduced, especially the new technical means of support monitoring and control, so as to ensure the structural safety of the main beam pouring support system. The error identification of control parameters is carried out by using least square principle and inversion analysis method. Through the analysis of examples, the coincidence between the real parameter value and the parameter correction value is contrasted, and it is verified that the parameter estimation value with high accuracy can be obtained after the parameters are corrected. Therefore, through the parameter identification and correction in the construction process, the finite element calculation model which is more in line with the actual engineering can be established, which can better guide the construction in an orderly manner. On the basis that the finite element model is more in line with the field reality, the influence matrix method and the inverted method are used to determine the initial tension of the suspender respectively. The calculation principle and process of the two methods are introduced. Both methods take the design value of cable force of suspension rod as the control target and give consideration to the deformation and internal force of the structure. Through the application of two methods in different tensioning schemes, it is found that the combination of the influence matrix method and the formal iterative analysis has a greater advantage in determining the initial tension of the suspender. According to the different tension sequence of the suspenders, the influence matrix method is used to calculate the reasonable initial tension of the suspenders, and then the formal fitting analysis is carried out to select the tension schemes which are in line with the actual situation in the field and are easy to carry out. Through the study of the construction control of Nielsen system concrete filled steel tube arch bridge, this paper lays a theoretical foundation for the bridge to be as close as possible to the design state, and can provide reference for the construction monitoring of the same type of arch bridge.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4
[Abstract]:With the rapid development of arch bridge in the construction of high-speed railway in our country, Nielsen system concrete filled steel tube arch bridge is popular with railway builders because of its advantages such as large stiffness, beautiful appearance, good economic benefit, safety and reliability, strong span ability and so on. In order to avoid major accidents such as structural collapse in the process of bridge construction, to ensure the construction quality of the structure, and to realize the design intention as perfectly as possible, The relevant departments of the state have introduced a third party to monitor the construction process of the high-tech bridge construction. In China, the construction monitoring of external bridges is mostly aimed at long-span cable-stayed bridges, continuous rigid frame bridges and other bridge types, but for Nielsen system concrete filled steel tube arch bridge construction monitoring, there is a lack of systematic, Targeted construction monitoring technical measures and construction practice. Combined with the origin of Nielsen system concrete-filled steel tube arch bridge and the development situation at home and abroad, this paper introduces the characteristics of the bridge structure, taking the 128m concrete filled steel tube arch bridge of Zhengwan-Wan railway as the research object. I mainly did the following work: 1. By using the finite element software Midas / civil, the simulation model of 3D bar structure is established, the construction stages of the whole bridge are simulated, and the modeling method of the key structure of the arch bridge is summarized in detail. The overall construction control scheme is worked out and the key points of measurement and monitoring in each stage are introduced, especially the new technical means of support monitoring and control, so as to ensure the structural safety of the main beam pouring support system. The error identification of control parameters is carried out by using least square principle and inversion analysis method. Through the analysis of examples, the coincidence between the real parameter value and the parameter correction value is contrasted, and it is verified that the parameter estimation value with high accuracy can be obtained after the parameters are corrected. Therefore, through the parameter identification and correction in the construction process, the finite element calculation model which is more in line with the actual engineering can be established, which can better guide the construction in an orderly manner. On the basis that the finite element model is more in line with the field reality, the influence matrix method and the inverted method are used to determine the initial tension of the suspender respectively. The calculation principle and process of the two methods are introduced. Both methods take the design value of cable force of suspension rod as the control target and give consideration to the deformation and internal force of the structure. Through the application of two methods in different tensioning schemes, it is found that the combination of the influence matrix method and the formal iterative analysis has a greater advantage in determining the initial tension of the suspender. According to the different tension sequence of the suspenders, the influence matrix method is used to calculate the reasonable initial tension of the suspenders, and then the formal fitting analysis is carried out to select the tension schemes which are in line with the actual situation in the field and are easy to carry out. Through the study of the construction control of Nielsen system concrete filled steel tube arch bridge, this paper lays a theoretical foundation for the bridge to be as close as possible to the design state, and can provide reference for the construction monitoring of the same type of arch bridge.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4
【参考文献】
相关期刊论文 前10条
1 蔡如松;王灿;王莹;;刚性吊杆系杆拱桥吊杆更换施工监控[J];中国水运(下半月);2017年01期
2 刘念琴;李勇;张承;曹逻津;周，
本文编号：2135397
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