在役预应力混凝土空心板梁桥病害处置对策及加固效果试验研究

发布时间：2018-09-05 21:14

【摘要】：自二十世纪八十年代以来,伴随着我国经济建设的快速发展,我国公路交通基础设施建设及其重要组成部分的桥梁事业均取得了巨大成就。作为其中一种重要的结构形式,空心板梁由于其经济性被广泛应用于公路桥梁中,大多数早期建设的高速公路中空心板梁所占比例高达80%-90%。然而,随着交通量的迅猛增长、重载车辆的增多,一些问题也逐渐暴露出来,预应力空心板梁桥也相继出现了许多病害。本文首先介绍了国内外在役桥梁,尤其是预应力空心板梁的现状及典型病害,在对其病害成因进行分析后,提出了相应的加固处置对策,并重点阐述了粘贴钢板加固法、体外预应力加固法、体内预应力加固法等三种加固方法的研究现状。其次,对预应力空心板梁桥现行加固效果试验评定方法进行了梳理,在评价指标中存在的问题进行分析讨论的基础上,提出了预应力度、钢绞线应力幅、裂缝宽度等评价指标的试验检测方法。最后,将以上研究成果应用到某高速公路25m跨度的后张法预应力混凝土大空心板梁病害处治工程中,对提出的三种不同加固方案的加固效果进行了客观评价,取得了较为合理的结果。通过本文研究,可以看出桥梁加固工作是一个系统的、复杂的工程,按照“外观检测-病害桥梁试验评判-加固设计-加固施工及监测-加固效果试验评定”的流程进行操作,能准确把握病害的成因、加固方案做到有的放矢、控制加固过程中的风险、有效的评价其加固效果,使整个加固工作在安全、可控下进行。
[Abstract]:Since the eighties of the 20th century, with the rapid development of China's economic construction, great achievements have been made in the construction of highway transportation infrastructure and its important component of the bridge cause. As one of the most important structural forms, hollow slab beam is widely used in highway bridges because of its economy. The proportion of hollow slab beam in most of the early expressway is as high as 80-90. However, with the rapid growth of traffic volume and the increase of heavy-duty vehicles, some problems have been gradually exposed, and many diseases have appeared in the prestressed hollow slab girder bridge. This paper first introduces the present situation and typical diseases of existing bridges at home and abroad, especially the prestressed hollow slab beams. After analyzing the causes of the defects, the corresponding strengthening countermeasures are put forward, and the method of strengthening with steel plates is emphasized. The research status of external prestressing reinforcement method and internal prestressing reinforcement method. Secondly, the test and evaluation method of reinforcement effect of prestressed hollow slab girder bridge is combed out. Based on the analysis and discussion of the problems in the evaluation index, the degree of prestress and the stress amplitude of steel strands are put forward. Test and test method for crack width and other evaluation indexes. Finally, the above research results are applied to the disease treatment project of post-Zhang Fa prestressed concrete hollow slab beam with 25m span of a certain expressway, and the effect of the three different reinforcement schemes is evaluated objectively. Reasonable results have been obtained. Through the study of this paper, it can be seen that the bridge strengthening work is a systematic and complex project, which is operated according to the process of "appearance detection-disease bridge test evaluation-strengthening design-strengthening construction and monitoring-strengthening effect test evaluation". It can accurately grasp the cause of the disease, control the risk in the process of reinforcement, evaluate the effect of the reinforcement, and make the whole reinforcement work safe and controllable.
【学位授予单位】：中国铁道科学研究院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.72

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