考虑连拱效应的多跨拱桥加固方法研究

发布时间：2018-05-30 21:02

本文选题：加固施工 + 连拱效应　；参考：《西南交通大学》2016年硕士论文

【摘要】：上世纪70-90年代,由于经济发展的需要,我国修建了大量的钢筋混凝土拱桥。在数十年的运营过程中,由于缺乏管理、养护、维修,很多钢筋混凝土拱桥已经不能满足交通的需求,甚至成为制约经济发展的因素,所以对这些钢筋混凝土拱桥的加固改造至关重要。在多跨拱桥的加固施工中,主拱圈内力和墩顶水平推力的控制至关重要,由于连拱效应的影响,在多跨拱桥的加固施工中,不仅要对桥梁施工过程中结构的承载能力、稳定性进行分析计算,而且更应采用合理、科学的施工方法,降低多孔拱桥在加固施工中的风险。本文的主要研究内容有：(1)了解和概括我国拱桥发展相关历程,对我国拱桥发展期间的出现的问题进行分析整理,主要统计了拱桥事故发生的时间和原因,总结事故特点；根据不同拱桥的结构特点和繁荣时期,简述拱桥结构未来的发展趋势。(2)以武胜嘉陵江多跨拱桥加固施工工程为论文背景,对2×72m拱跨提出不同的加固施工方法,分析不同加固施工方法中拱圈的内力和稳定性、桥墩的内力和稳定性,根据结构承载能力选择合适的加固施工方法。(3)在考虑连拱效应的假设下,以主拱圈承载能力、桥墩稳定性为前提,设计全桥加固施工方法,运用有限元分析软件对全桥加固施工方法进行模拟。(4)探讨连拱效应的主要影响因素,分析拱上结构与主拱圈联合作用在多跨拱桥加固施工和桥梁运营阶段对结构的影响。
[Abstract]:Due to the need of economic development, a large number of reinforced concrete arch bridges were built in the 70-90's of last century. In the course of decades of operation, due to the lack of management, maintenance and maintenance, many reinforced concrete arch bridges have been unable to meet the traffic demand, and have even become a factor restricting economic development. So the reinforcement and reconstruction of these reinforced concrete arch bridges is very important. In the reinforcement construction of multi-span arch bridge, the internal force of the main arch ring and the horizontal thrust at the top of the pier are very important. Because of the influence of the multi-arch effect, in the reinforcement construction of the multi-span arch bridge, not only the bearing capacity of the structure in the construction process of the bridge is required, but also the bearing capacity of the structure. The stability is analyzed and calculated, and reasonable and scientific construction methods should be adopted to reduce the risk of reinforcement of the porous arch bridge. The main research contents of this paper are as follows: (1) understanding and summarizing the development history of arch bridges in China, analyzing and arranging the problems during the development of arch bridges in China, mainly counting the time and causes of the arch bridge accidents, and summarizing the characteristics of the accidents. According to the structural characteristics of different arch bridges and the prosperous period, the development trend of the arch bridge structure in the future is briefly described. Based on the strengthening construction of the multi-span arch bridge in Jialing River, Wusheng, this paper puts forward different reinforcement construction methods for the 2 脳 72m arch span. This paper analyzes the internal force and stability of arch ring in different reinforcement construction methods, and the internal force and stability of bridge pier. According to the bearing capacity of the structure, the appropriate reinforcement construction method is chosen. Under the assumption of multi-arch effect, the bearing capacity of the main arch ring is taken into account. Based on the stability of bridge pier, this paper designs the construction method of full bridge reinforcement, and uses finite element analysis software to simulate the whole bridge reinforcement construction method. The influence of the combination of arch structure and main arch ring on the structure during the construction and operation of multi-span arch bridge is analyzed.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U448.22;U445.72

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