拱轴线偏差对箱形拱桥结构行为的影响及对策研究

发布时间：2018-02-13 22:28

本文关键词： 钢筋混凝土箱型拱桥拱轴线偏差内力稳定性处治方法　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：对于大跨度钢筋混凝土箱型拱桥，随着跨径的增大，结构的整体刚度降低，主拱圈拱轴线微小的偏差和强大的拱轴力相互作用，可产生较大的弯矩，线形偏差过大甚至会成为结构破坏的主要诱导因素。而拱轴线偏差在拱桥设计、制造、施工阶段和营运过程中是难以避免的，为了确保桥梁的安全施工、运营和维护，必须着力研究拱轴线偏差对拱桥结构行为的影响及其处治方案等问题。 ○1分析了拱轴线偏差对悬链线拱桥拱脚水平推力的影响，接着对拱轴线偏差对拱桥内力和稳定性的影响进行了理论分析,并推导了实桥恒载压力线的计算方法，分别分析了正对称偏差和反对称偏差状况下对拱桥内力的影响，并对其进行比较。对平面内和平面外的偏差对稳定性的影响进行了分析，比较了两者对结构稳定性影响的程度。分析了国内外拱桥拱轴线形偏差控制方法的研究现状，《对公路工程质量评定标准》(JTGF801 2004)关于施工中拱轴线形偏差容许值的规定做了相应的理论分析，并对《评定标准》“8-8-3拱的安装”中对拱轴线形偏差限值相应的规定是否适用于大跨径拱桥线形偏差控制进行了探讨。 ○2以施工过程中存在较大拱轴线偏差的某桥为工程依托，运用有限元软件对某桥设计状态和拱轴线偏差状态分别建立模型进行模拟计算，对比原设计状态下和偏差状态下结构行为，客观评估实测拱轴线偏差对桥梁内力和稳定性影响，为处治方案提供依据。 ○3针对某桥偏差现状，通过技术经济比较进行方案选择，，提出了钢筋混凝土套箍环状封闭拱箱接缝、套箍环状封闭拱脚、调整拱顶现浇层厚度的处治对策。对处治后进行了施工阶段分析，确保施工过程的安全。为同类型桥梁的处治对策提供参考。
[Abstract]:For the long-span reinforced concrete box arch bridge, with the increase of span, the overall stiffness of the structure decreases, the minor deviation of the arch axis of the main arch ring and the strong interaction of the arch axial force can result in greater bending moment. The deviation of the arch axis is unavoidable in the design, manufacture, construction and operation of the arch bridge, in order to ensure the safe construction, operation and maintenance of the bridge, It is necessary to study the influence of arch axis deviation on the structure behavior of arch bridge and its treatment scheme. The influence of arch axis deviation on the horizontal thrust of arch foot of catenary arch bridge is analyzed, and the influence of arch axis deviation on the internal force and stability of arch bridge is analyzed theoretically, and the calculation method of dead load pressure line of real bridge is deduced. The influence of normal symmetry deviation and antisymmetric deviation on the internal force of arch bridge is analyzed and compared. The influence of the deviation in plane and out of plane on the stability of arch bridge is analyzed. This paper compares the influence of the two methods on the stability of the structure, analyzes the present situation of the research on the control methods of the arch axis deviation at home and abroad, and gives a specification on the allowable value of the arch axis line deviation in the construction of JTGF801 / 2004. The corresponding theoretical analysis has been made. This paper also discusses whether the corresponding limit value of arch axis deviation in "8-8-3 Arch installation" is applicable to the control of alignment deviation of long-span arch bridge. 02 based on a bridge with large arch axis deviation in the construction process, the finite element software is used to simulate and calculate the design state and the arch axis deviation state of a certain bridge, respectively. Compared with the structural behavior under the original design state and the deviation state, the influence of the measured arch axis deviation on the internal force and stability of the bridge is evaluated objectively, which provides the basis for the treatment scheme. In view of the current situation of the deviation of a certain bridge, through the technical and economic comparison, the scheme is selected, and the reinforced concrete hoop annular closed arch box joint and the hoop annular closed arch foot are put forward. The treatment measures for adjusting the thickness of the cast-in-place layer of the arch roof are analyzed in the construction stage after treatment to ensure the safety of the construction process and to provide a reference for the treatment countermeasures of the same type of bridges.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.22

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