拱桥吊杆更换若干关键问题研究

发布时间：2018-03-10 02:02

本文选题：吊杆更换　切入点：有限元分析　出处：《浙江大学》2014年硕士论文　论文类型：学位论文

【摘要】：自上世纪九十年代起吊杆拱桥开始在我国迅猛发展,但限于当时的技术水平以及后期使用上的不当,近年来不断的有吊杆因为锈蚀、疲劳等原因出现破损。为了确保拱桥吊杆的正常使用,对这些旧桥的吊杆更换工作已势在必行。但吊杆更换工程是一个复杂的整体工程,技术难度较大,到目前为止工程界对吊杆更换的研究还处于一个初级阶段,没有形成一套成熟完整的吊杆更换施工工艺。鉴于此,为了确保吊杆更换过程的安全,很有必要对吊杆更换进行进一步的研究。本文首先介绍了吊杆拱桥的类型、受力特点,总结了拱桥吊杆的工程现状及破损、更换情况,紧接着以楠溪江三桥吊杆更换工程为背景,针对当前吊杆更换过程当中存在的一些关键问题进行了研究,总结归纳了以下几方面的内容： 1)基于有限元软件MIDAS,提出了一种桥面有效刚度的模拟方法,解决了如何准确地计算桥面支撑法更换过程中各阶段的桥面变形和吊杆力的变化问题,研究了不同的施工步长对桥面的变形、转角以及吊杆力的影响。 2)分析了不同吊杆更换施工方法对桥面变形的影响,提出了采用转角影响矩阵并结合桥梁设计荷载来计算更换过程中桥面最大允许转角的方法,针对短吊杆还提出了一种简易的监控方法。 3)基于有限元软件MIDAS研究了减震器的刚度和安装位置对吊杆频率、吊杆有效长度的影响,并通过数值拟合得到了通过修改吊杆的有效长度来考虑减震器影响的吊杆力计算公式。 4)以楠溪江三桥更换施工中吊杆力的实测数据为依据,得到了吊杆两端刚度变化段对吊杆有效长度的影响,研究结果表明对于同一类型的吊杆,刚度变化段对吊杆有效长度的影响为一定值。 5)总结了楠溪江三桥吊杆更换的施工监控过程,为同类型的吊杆更换施工提供了经验。
[Abstract]:The arch bridge to start the rapid development in our country since the last century in 90s, but was limited to the technical level and the use of improper, in recent years the boom because of corrosion, fatigue and other causes of damage. In order to ensure the normal use of the arch bridge, old bridge suspender replacement work is imperative. But the suspender replacement the project is a complex system engineering, technical difficulty, so far the engineering research on suspender replacement is still in the primary stage, have not formed a mature and complete construction process of replacing suspender. In view of this, in order to ensure the safety of suspender replacement process, it is necessary for the suspender replacement for further study.
This paper first introduces the types of suspenders of arch bridge, the stress characteristic, summarizes the engineering status of arch bridge suspender and damaged, replacement, followed by Nanxi River bridge suspender replacement project, aiming at some key problems existing among the current process of suspender replacement were studied and summarized as follows:
1) based on the finite element software MIDAS, presents a simulation method for effective deck stiffness, solves the problem of how to accurately calculate the deformation of the bridge deck and deck support method replacing Suspender Force during various stages of change, different steps of the construction deformation of bridge deck was studied, and the influence of angle of Suspender Force.
2) the influence of different suspender replacement methods on bridge deck deformation is analyzed. A method of calculating the maximum allowable rotation angle of bridge deck during the replacement process is put forward based on the angle influence matrix combined with the bridge design load, and a simple monitoring method for short suspender is also proposed.
3) based on the finite element software MIDAS, we studied the influence of the stiffness and installation position of the shock absorber on the boom frequency and the effective length of the boom, and by numerical fitting, we got the calculation formula of the hanger force by modifying the effective length of the boom to take into account the influence of the shock absorber.
4) measured data of Nanxi River bridge in the construction of replacing Suspender Force as the basis, the effect of changing the hangers stiffness on the effective length of the boom, the results show that for the same type of boom, the effect of stiffness change section of the effective length of suspenders is a certain value.
5) summarizes the construction monitoring of Nanxi River bridge suspender replacement, provide the experience for the same type of suspender replacement construction.

【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.22

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