钢—混凝土组合箱梁桥面板的组合施工技术研究

发布时间：2018-12-11 01:57

【摘要】：目前,大跨度钢-混组合箱梁结构在桥梁建设中应用十分广泛,这种结构是基于钢结构和混凝土结构发展起来的,充分吸收了钢材和混凝土两种材料的优点。钢-混凝土组合箱梁梁桥具有刚度大、稳定性高和受力性能良好等特点,其力学行为、空间受力性能等都得到广泛研究,在设计理论与方法、试验研究方法和计算分析方法上都取得了重大成果。但现阶段桥梁建设过程中,不仅要使结构受力合理,同时也需要关注综合经济效益。现阶段对于这种特大型跨海大桥的建设,都是采用动态设计,施工监控量测、设计和施工互相依存并密切配合。但混凝土桥面板的应力情况十分复杂多变,应该更加优化施工技术,优化混凝土桥面板施工组合顺序和方式,提高桥梁的整体技术经济优势。本文依托在建的港珠澳大桥CB05标段浅水区非通航孔连续桥为工程背景,结合现有理论基础和实践成果,以现场测量和有限元模型分析,开展的研究工作如下:①归纳总结了混凝土桥面板的类型和设计方法通过国内外的相关研究成果,总结了混凝土桥面板的有效宽度计算方法;明确了设计与施工紧密联系的设计理念;讨论了一些设计与施工中的重难点问题并提出相关解决措施。②混凝土桥面板两种不同组合顺序的研究通过有限元模型计算分析了混凝土桥面板两种不同的组合顺序对桥梁结构受力特征的影响;以工程背景为基础,分析了不同后浇带长度对桥梁结构受力的影响;结合工程实际情况选择最优施工方法和组合顺序。③支座顶升和回落对桥梁结构受力影响的研究连续梁桥在中间支座的位置会产生负弯矩,负弯矩不论是对钢箱梁还是混凝土桥面板的受力都十分不利,混凝土桥面板因此极易产生裂缝,对桥梁的危害很大。本文结合工程实例和midas模型对支座顶升和回落的施工方法进行了模拟,详细分析了不同顶升量对桥梁结构的受力影响,并分析了顶升过程中由于支座沉降对桥梁结构的受力影响。本文结合国内外现有相关理论和工程实际,对钢-混凝土组合箱梁桥的桥面板施工方法进行了相关研究,提出了一些施工优化措施,对进一步完善我国钢-混凝土组合箱梁桥设计与施工方法具有一定的参考价值。
[Abstract]:At present, the long-span steel-concrete composite box girder structure is widely used in bridge construction. This kind of structure is developed based on steel structure and concrete structure, which fully absorbs the advantages of steel and concrete materials. Steel-concrete composite box girder bridges are characterized by high stiffness, high stability and good mechanical properties. Great achievements have been made in both experimental research methods and calculation and analysis methods. However, in the process of bridge construction at present, it is necessary not only to make the force of the structure reasonable, but also to pay attention to the comprehensive economic benefits. At the present stage, dynamic design, construction monitoring and measurement, design and construction are interdependent and closely cooperate with each other in the construction of this super large bridge. However, the stress of concrete deck slab is very complex and changeable, so it is necessary to optimize the construction technology, optimize the sequence and mode of concrete deck slab construction, and improve the overall technical and economic advantages of the bridge. In this paper, based on the engineering background of the continuous bridge in shallow water area of the CB05 section of the Hong Kong-Zhuhai-Macao Bridge under construction, combined with the existing theoretical basis and practical results, the field measurement and finite element model analysis are used. The research work carried out is as follows: 1 the types and design methods of concrete deck slabs are summarized and the effective width calculation methods of concrete deck slabs are summarized through the relevant research results at home and abroad; The design concept which is closely related to design and construction is clarified. Some important and difficult problems in design and construction are discussed and relevant measures are put forward. (2) Research on two different combinations of concrete deck slabs through finite element model calculation and analysis of two different combinations of concrete deck slabs The influence of sequence on the stress characteristics of bridge structure; Based on the engineering background, the influence of the length of the post-pouring belt on the stress of the bridge structure is analyzed. Selection of the optimal Construction method and combination sequence according to the actual conditions of the Project. 3 the influence of uplift and fall of bearing on the stress of Bridge structure; the position of continuous beam bridge in the middle bearing will produce negative bending moment. The negative bending moment is very disadvantageous to the steel box girder and concrete deck slab, so the concrete deck slab is easy to produce cracks, which is harmful to the bridge. Combined with engineering examples and midas model, this paper simulates the construction methods of uplift and fall of support, and analyzes in detail the influence of different lifting quantities on the force of bridge structure. The influence of bearing settlement on bridge structure in the process of uplift is analyzed. Combined with the existing theories and engineering practice at home and abroad, this paper studies the construction method of steel-concrete composite box girder bridge deck, and puts forward some construction optimization measures. It has certain reference value for improving the design and construction method of steel-concrete composite box girder bridge in China.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4

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