摩擦自锁式预制桥墩连接可行性研究

发布时间：2018-03-29 21:38

  本文选题：预制桥墩　切入点：自复位　出处：《北京工业大学》2015年硕士论文

【摘要】：随着我国交通基础设施建设的推进,在未来的几十年内将有大批桥梁面临改建和替换。桥梁重建势必会影响既有道路上的车辆通行,带来较大的社会成本。因而发展一种快速桥梁建造技术势在必行。预制拼装技术采用工厂化生产、现场拼装回避了大量的现场工序,能够实现桥梁的快速施工。而且预制拼装技术能有效控制施工质量并减少对现场周边的干扰使其成为未来的发展趋势。目前,桥梁上部结构的预制技术已经比较成熟,但桥梁下部结构却很少采用预制技术。而且现存预制下部结构桥梁大都位于低烈度区。由于起重、运输限制桥墩只能分节段预制。预制节段间的连接部分在地震的作用下可能会成为薄弱点发生破坏,这大大限制了预制桥墩在工程中的应用。国内对预制拼装桥墩的地震响应机理研究较少,对于连接构造的设计与施工方法尚处于探索阶段。随着抗震技术的发展,除了抗震安全性能,工程界还对结构的震后损伤、残余变形等方面提出了更高的要求。以往研究表明,设计合理的连接构造能使预制桥墩具有比传统现浇桥墩更优秀的抗震性能。本文以震后低损伤、低残余变形为目标,设计了一种基于摩擦自锁原理的预制桥墩连接构造。并采用有限元软件ABAQUS对摩擦自锁式连接构造进行了三维仿真建模。并对关键设计参数对连接构造滞回性能、部件应力的影响进行了研究。然后,基于实际应用对摩擦自锁式连接构造的设计细节进行了优化。最后,对摩擦自锁式连接构造在实际地震作用下的响应进行了初步分析。结果表明,本文设计的摩擦自锁式连接构造基本能够实现震后低损伤、低残余变形的设计目标。初步验证了其实际应用的可行性。
[Abstract]:With the development of transportation infrastructure in our country, a large number of bridges will be rebuilt and replaced in the coming decades. The reconstruction of bridges will inevitably affect the traffic on the existing roads. Therefore, it is imperative to develop a kind of rapid bridge construction technology. The prefabricated assembly technology adopts factory production, and the on-site assembly avoids a large number of on-site processes. It can realize the rapid construction of the bridge, and the prefabricated assembling technology can effectively control the construction quality and reduce the interference to the surrounding of the site so that it becomes the future development trend. At present, the prefabrication technology of the superstructure of the bridge has been more mature. However, prefabricated technology is rarely used in the substructure of the bridge. Moreover, most of the existing prefabricated substructure bridges are located in low-intensity areas. The piers can only be precast in segments. The connection between the prefabricated segments may become a weak spot in the event of an earthquake. This greatly limits the application of prefabricated piers in engineering. There are few researches on the seismic response mechanism of prefabricated piers in China, and the design and construction methods of connecting structures are still in the exploratory stage. In addition to seismic safety performance, the engineering community has also put forward higher requirements for post-earthquake damage and residual deformation of structures. The prefabricated piers have better seismic performance than the traditional cast-in-place piers with reasonable connection design. This paper aims at low damage and low residual deformation after the earthquake. A prefabricated pier connection structure based on friction self-locking principle is designed, and the three-dimensional simulation modeling of friction self-locking connection structure is carried out by using finite element software ABAQUS. The influence of component stress is studied. Then, based on the practical application, the design details of friction self-locking connection are optimized. The response of friction self-locking connection structure under actual earthquake is analyzed. The results show that the friction self-locking connection structure designed in this paper can basically achieve low damage after earthquake. The design goal of low residual deformation. The feasibility of its practical application is preliminarily verified.
【学位授予单位】：北京工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.22;U442.55
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本文编号：1682998