基于交通量增长的预应力混凝土箱梁桥长期性能控制研究

发布时间：2018-06-27 02:17

本文选题：大跨径 + 预应力　；参考：《东南大学》2015年硕士论文

【摘要】：随着高速公路建设的飞速发展,国内涌现出越来越多的公路桥梁,而预应力混凝土箱梁桥以其卓越的力学性能、成熟的施工工艺、舒适的行车质量等,在我国桥梁建设中取得了非凡的成就。但由于交通量的增长以及桥梁结构设计、施工等方面的原因,现役预应力混凝土箱梁桥在运营过程中出现了诸多的问题。本文结合实际工程,对大跨径预应力混凝土箱梁桥的长期性能问题进行分析并提出相关处治对策。研究内容分为以下几个方面：(1)总结并分析大跨径预应力混凝土箱梁桥长期挠度的影响因素,并以实际工程为背景,对相关的影响因素做敏感性分析,得出各因素影响的主次关系。(2)从相关文献可以发现,目前国内很少有学者通过实际车流量分析活载对桥梁长期性能的影响：另一方面,尽管活载是重要影响因素,但是其计算的量值因人而异,很难得到一个较为定量和有说服力的分析。本文在研究其他因素的基础上,重点研究了活载对长期性能的影响；并文以江苏省某典型路段为例,分析其交通流量特性,并建立基于交通量的车辆荷载多峰模型；从而研究活载对桥梁长期性能的影响,给出一个有针对性的、定量的分析结果,并在可能的情况下,提出对现行规范中计算参数的修正意见。(3)本文分析并研究了箱梁裂缝产生的原因,并提出相关的处治对策。(41结合部分工程实例,从设计、施工、养护、管理、加固等方面提出相关的处治对策和建议。
[Abstract]:With the rapid development of highway construction, more and more highway bridges have emerged in China. The prestressed concrete box girder bridge has made remarkable achievements in the construction of bridge in China with its excellent mechanical properties, mature construction technology and comfortable driving quality, but it is caused by the increase of traffic volume, the design of bridge structure, construction and so on. For the reasons, there are many problems in the operation of the existing prestressed concrete box girder bridge. In this paper, the long-term performance of the long span prestressed concrete box girder bridge is analyzed and the countermeasures are put forward in this paper. The contents are divided into the following aspects: (1) summing up and analyzing the long-span prestressed concrete coagulation. The influence factors of the long-term deflection of the soil box girder bridge, and taking the actual project as the background, to make sensitivity analysis to the related factors, and get the main and secondary relationship of the influence of various factors. (2) from the relevant literature, it is found that few scholars at present have analyzed the effect of live load on the long-term performance of the bridge through actual vehicle flow analysis in China: on the other hand, live load It is an important factor, but the value of the calculation varies from person to person. It is difficult to get a more quantitative and convincing analysis. On the basis of other factors, this paper focuses on the effect of live load on long-term performance. The paper takes a typical section of Jiangsu Province as an example to analyze the traffic flow characteristics and establish the traffic volume based on the traffic volume. Vehicle load multi peak model, thus studying the effect of live load on the long-term performance of bridge, giving a targeted, quantitative analysis results, and in the possible case, put forward the correction of the calculation parameters in the current norms. (3) this paper analyzes and studies the causes of the cracks in the box girder, and puts forward the relevant treatment countermeasures. (41 Some engineering examples, from the design, construction, maintenance, management, reinforcement and other aspects of the relevant countermeasures and suggestions.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.7;U448.213

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