大跨度转体施工T构桥参数敏感性分析

发布时间：2018-06-22 15:05

本文选题：T构桥 + 转体施工　；参考：《武汉理工大学》2014年硕士论文

【摘要】：进入21世纪以来，我国的桥梁建设取得了较大的进步和发展，随着路网的不断完善和扩展，必然需要修建大量跨越既有线路的桥梁工程，包括跨越既有铁路、新建铁路、既有公路桥梁及新建公路桥梁等工程。为减弱对既有线路的影响，同时保证线路交叉的安全和经济适用性，采用转体施工的桥梁逐步增加，也被铁路局等业主单位所认同。为此，有必要深入研究和剖析采用转体施工的桥梁工程的各类参数，以对其进行设计和施工进行优化，降低工程造价，提高此类桥梁的设计和施工质量。文章以参数敏感性分析为理论基础，，对转体施工的桥梁工程进行参数敏感性识别和分析研究。文章从以下五个方面开展研究：（1）分析了转体施工桥梁工程设计、施工现状和发展趋势，阐述了该类桥梁工程设计和施工中应考虑的影响参数，分析了该类型桥梁参数敏感性分析的现状并提出本文的研究内容及意义。（2）从理论角度研究了参数敏感性分析的基本理论和方法，并针对转体施工的桥梁工程，对该类桥梁提出了单因素和多因素识别方法，同时研究统计了影响桥梁应力和线形的关键参数及其识别方法。（3）建立了转体施工T构桥的数值分析模型。以背景项目工程监测监控为基础，采用现场实测数据，对已建的数值分析模型进行修正和完善，以期成为符合现场实际情况的基准模型，为参数敏感性分析提供理论分析模型。（4）进行了转体施工桥梁单因素参数敏感性分析。以主梁混凝土、预应力张拉力、钢筋锈蚀等作为材料参数进行单因素敏感性分析；以汽车荷载、温度作用、混凝土收缩徐变、基础不均匀沉降等作为作用参数进行逐一的单因素敏感性分析。结果表明：即弹性模量对应力的影响较小；对主梁应力影响较大的为主梁容重、预应力张拉力、预应力钢筋锈蚀。（5）基于单因素敏感性分析，进行了转体施工桥梁多因素参数敏感性分析。对主梁混凝土、预应力等作为材料参数进行随机的多因素敏感性分析，并分析了其敏感性程度；以汽车荷载、温度作用、混凝土收缩徐变、基础不均匀沉降等作为作用参数进行随机的多因素敏感性分析，并分析了其敏感性程度。结果表明：从趋势上讲，与单因素相应为一致，即随着外力作用效应的增加，主梁应力水平降低，导致压应力储备降低，甚至可能出现拉应力或者超规范的限值。从实际应力绝对值讲，容重、预应力张拉力、汽车活载、支座沉降作用等均对应力较为敏感。综上，通过对转体施工T构桥梁工程参数敏感性分析，研究结果和结论可以为设计、施工及运营管理等部门提供指导，并进行相应的优化管理。
[Abstract]:Since entering the 21st century, the bridge construction in our country has made great progress and development. With the continuous improvement and expansion of the road network, it is necessary to build a large number of bridge projects spanning the existing lines, including crossing the existing railways and building new railways. Existing highway bridges and new highway bridges and other projects. In order to weaken the influence on the existing lines and ensure the safety and economic applicability of the crossing of the lines, the number of bridges constructed by the rotary construction has been gradually increased, which has also been recognized by the owners such as the Railway Bureau. Therefore, it is necessary to deeply study and analyze the various parameters of the bridge construction with rotary construction in order to optimize the design and construction of the bridge, reduce the project cost and improve the design and construction quality of this kind of bridge. Based on the theory of parameter sensitivity analysis, this paper studies the parameter sensitivity identification and analysis of bridge engineering in rotary construction. In this paper, the following five aspects are studied: (1) the paper analyzes the design, construction status and development trend of the rotary construction bridge, and expounds the influence parameters which should be considered in the design and construction of this kind of bridge. The present situation of parameter sensitivity analysis of this type of bridge is analyzed, and the research content and significance of this paper are put forward. (2) the basic theory and method of parameter sensitivity analysis are studied from the theoretical point of view. The single factor and multi-factor identification methods are proposed for this kind of bridge. The key parameters affecting the stress and alignment of the bridge and their identification methods are also studied. (3) the numerical analysis model of the T-structure bridge in rotary construction is established. Based on the background project monitoring and monitoring, the established numerical analysis model is modified and perfected by using the field measured data in order to become the benchmark model in accordance with the actual situation in the field. It provides a theoretical analysis model for parameter sensitivity analysis. (4) the single factor parameter sensitivity analysis of rotating construction bridge is carried out. The single factor sensitivity analysis of main beam concrete, prestressed tensioning force, steel bar corrosion and so on is carried out, and the shrinkage and creep of concrete are analyzed by automobile load, temperature effect, concrete shrinkage and creep, etc. The single factor sensitivity analysis is carried out one by one as action parameters such as uneven settlement of foundation. The results show that the elastic modulus has little effect on the stress, the bulk density, the prestress tension and the corrosion of the prestressed steel bar of the main beam have greater influence on the stress of the main beam. (5) based on the single factor sensitivity analysis, The sensitivity analysis of multi-factor parameters is carried out. The random multifactor sensitivity analysis of the main beam concrete, prestress and so on as material parameters is carried out, and the sensitivity degree is analyzed, and the shrinkage and creep of concrete are analyzed by automobile load, temperature effect, concrete shrinkage and creep, etc. The random multifactor sensitivity analysis was carried out and the sensitivity degree was analyzed. The results show that the trend is consistent with that of single factor, that is, with the increase of external force effect, the stress level of the main beam decreases, which leads to the decrease of compressive stress reserve, and even the possibility of tensile stress or the limit value of superstandard. In terms of the absolute value of actual stress, bulk density, prestress tension, live load of automobile and settlement of bearing are all sensitive to the stress. In summary, through the sensitivity analysis of the engineering parameters of T structure bridge in rotary construction, the research results and conclusions can provide guidance for the departments of design, construction and operation management, and carry out the corresponding optimization management.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4;U448.23

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