高墩大跨度连续刚构桥施工控制及影响参数分析

发布时间：2018-11-03 08:01

【摘要】：西部地区由于其地形、地貌条件，高墩大跨预应力连续刚构桥凭借其线形明快、施工简便快捷、强度高、跨越能力强的优点广泛的应用。本文结合该桥（58+105+58），从工程实际出发建立基于Midas/Civil的施工仿真计算模型。在以下的分析计算中，计算图式的选取和各种参数的取值都尽量反映出桥梁施工过程的实际情况，以求得到更为精准的模拟结果。所做主要工作如下：（1）综述国内外连续刚构桥发展现状及趋势；分析高墩大跨度连续刚构桥的受力特点；阐述施工控制在桥梁建设中的必要性；简要介绍刚构桥施工监控国内外研究现状。（2）阐述预应力混凝土连续刚构桥梁悬臂施工控制理论的基本理论、施工监控的基本流程以及施工控制的具体内容，重点分析影响连续刚构梁桥施工控制的主要因素。（3）运用桥梁结构有限元分析软件Midas/Civil建立施工阶段仿真分析模型，针对不同的合拢方案，，对比分析计算结果，主要从恒载内力、挠度与应力三方面对比分析两种方案的计算结果，最终确定出合理的施工方案。（4）结合分析计算模型，对大桥的主要影响参数进行敏感性研究分析，主要研究相关参数误差对结构在施工过程中和成桥状态的挠度、应力的影响。依据影响程度的大小识别出主要影响参数和次要影响参数，并总结其规律，从而得出对同类桥型的设计与施工具有借鉴意义的结论。（5）采用有限元仿真对设置下弯束与不设置下弯束分析，设置预应力下弯束之后，使得主梁截面的压应力得一定程度的提高，使得主梁结构有一定的安全储备，使得运营阶段的，能够有效的抵消部分预应力损失，大大减少了腹板的裂缝；从而保证运营阶段的桥梁结构的实用性和耐久性；
[Abstract]:Due to its landform and geomorphological condition, the long span prestressed continuous rigid frame bridge with high piers is widely used by virtue of its linear shape, simple and fast construction, high strength and strong span ability. Combining with the bridge (58,10558), the construction simulation model based on Midas/Civil is established in this paper. In the following analysis and calculation, the selection of calculation schemas and the values of various parameters reflect the actual conditions of the bridge construction process as far as possible, in order to obtain more accurate simulation results. The main works are as follows: (1) summarize the development status and trend of continuous rigid frame bridges at home and abroad, analyze the mechanical characteristics of long-span continuous rigid frame bridges with high piers, expound the necessity of construction control in the construction of bridges; This paper briefly introduces the research status of rigid frame bridge construction monitoring at home and abroad. (2) the basic theory of cantilever construction control theory of prestressed concrete continuous rigid frame bridge, the basic flow of construction monitoring and construction control, and the main factors influencing construction control of continuous rigid frame bridge are expounded. (3) using the finite element analysis software Midas/Civil of bridge structure, the simulation analysis model of construction stage is established. According to different closing schemes, the calculation results are compared and analyzed, mainly from the point of view of dead load internal force. The calculation results of the two schemes are compared and analyzed in three aspects of deflection and stress, and the reasonable construction scheme is finally determined. (4) based on the analysis and calculation model, the sensitivity of the main influence parameters of the bridge is studied, and the influence of the error of the related parameters on the deflection and stress of the structure during the construction process and the state of the bridge is mainly studied. According to the magnitude of influence degree, the main influence parameters and secondary influence parameters are identified, and their rules are summarized, and the conclusions of reference significance for the design and construction of similar bridges are obtained. (5) the finite element simulation is used to analyze the bending beam with or without the lower bending beam. After the pre-stressed beam is set, the compressive stress of the main beam section is increased to a certain extent, and the main beam structure has a certain safety reserve. Make the operation phase, can effectively offset part of the prestress loss, greatly reduce the cracks in the web; In order to ensure the utility and durability of the bridge structure in operation stage;
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4

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