中承式钢筋混凝土拱桥吊杆更换技术研究

发布时间：2018-07-21 22:09

【摘要】：吊杆拱桥是近年来迅速发展的一类桥型,因其造型美观、跨越能力强、整体性好等优点而被广泛采用。吊杆既是此类拱桥重要的传力构件,也是极其容易破损的薄弱环节,一些建设较早的吊杆拱桥因对吊杆耐久性的设计不足,已出现严重病害,亟需更换。然而,目前针对拱桥吊杆的更换方案、设计准则、监测方法、安全防护等,尚无统一的规范规程。在大量的工程设计、修复、检测实践中,往往只能凭借经验进行操作,缺少理论依据。因此对拱桥吊杆更换进行研究非常必要。本文以某拱桥吊杆更换工程为背景,对吊杆更换的几点关键性问题进行研究,主要有以下几个方面：首先介绍了钢索、锚具、防护等吊杆主要构件,并根据拱桥检测内容和方法对其进行了全面检测,依据检测结果,对病害原因进行了详细的理论分析,为维修和加固提供依据,进而提出详细的吊杆更换施工方案和监测方案；结合有限元软件建立本桥精确模型,研究不同吊杆更换方法对桥梁结构的影响,模拟本桥的吊杆更换过程,并与实测数据进行比较,为吊杆更换提供理论依据；同时总结了常用的吊杆索力测试方法,并根据实际情况确定本桥索力测量方法,用反推法修正吊杆计算长度,以提高索力计算公式的准确度；最后,研究了正常运营状态下和吊杆更换状态下吊杆骤断后结构的动力响应及结构安全性。随着越来越多的吊杆拱桥进入到寿命限期,对吊杆更换的研究有了更迫切的需求。对其更换过程的有限元模拟及索力的精确测定能为吊杆更换施工控制提供理论依据。介于目前吊杆断裂事故频繁发生,研究吊杆骤断的结构动力响应对拱桥结构安全性有重要意义。本文涉及的吊杆更换关键问题的研究,对今后类似工程具有理论指导意义。
[Abstract]:Suspension arch bridge is a kind of bridge type developed rapidly in recent years. It is widely used because of its beautiful shape, strong span ability, good integrity and so on. The suspender is not only an important force transfer component of this kind of arch bridge, but also a weak link which is very easy to break. Because of the insufficient design of the suspender durability, some early construction arch bridges have been seriously damaged and need to be replaced. However, there is no uniform specification for replacement scheme, design criterion, monitoring method, safety protection and so on. In a large number of engineering design, repair, testing practice, often only rely on experience to operate, lack of theoretical basis. Therefore, it is necessary to study the replacement of arch bridge suspenders. Based on a certain arch bridge suspender replacement project, this paper studies several key problems of suspender replacement, mainly in the following aspects: firstly, it introduces the main components of suspension rod, such as steel cable, anchor, protection and so on. According to the detection content and method of arch bridge, the paper carries on the comprehensive inspection, according to the inspection result, carries on the detailed theory analysis to the disease reason, provides the basis for the maintenance and the reinforcement, then puts forward the detailed suspender replacement construction plan and the monitoring plan; Based on the finite element software, the accurate model of the bridge is established, the influence of different suspenders replacement methods on the bridge structure is studied, the process of the bridge suspension replacement is simulated, and compared with the measured data, the theoretical basis for the replacement of the suspenders is provided. At the same time, the common methods of cable force measurement are summarized, and the cable force measurement method of the bridge is determined according to the actual situation, and the calculating length of the suspension rod is modified by the back push method in order to improve the accuracy of the calculation formula of the cable force. In this paper, the dynamic response and structural safety of the structure after sudden breakage of the boom under normal operation condition and replacement state are studied. With more and more suspender arch bridges entering the life limit, the research on the replacement of suspenders has become more urgent. The finite element simulation of the replacement process and the precise measurement of the cable force can provide theoretical basis for the construction control of the replacement of the suspenders. In view of the frequent fracture accidents of suspenders at present, it is important to study the structural dynamic response of suspenders to the safety of arch bridges. The research on the key problem of suspender replacement in this paper is of theoretical significance to similar projects in the future.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.7

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