现浇上承式钢筋混凝土箱形拱桥拱圈与钢拱架的联合作用研究

发布时间：2018-01-06 14:04

本文关键词：现浇上承式钢筋混凝土箱形拱桥拱圈与钢拱架的联合作用研究　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：由于钢筋混凝土拱桥具有跨越能力大、应力分布均匀、整体稳定性较好等特点,在我们西部山区等地方得到普遍推广,主跨跨径多为100-150m。从施工角度看,山区的交通不发达,大型起吊设备进出场费用过高或进场困难,采用缆索吊装施工有一定的难度,所以拱架现浇施工成为一个较好的施工手段。拱架具有跨越能力大、组装便捷、材料可以多次循环使用且不受洪水等影响,施工期间可以满足正常的通航要求,所以特别适合山区拱桥的施工使用。在以往的拱架设计中,拱架承担70%以上的拱圈重量,这将会令临时设施费增加、拱架用量增加,从而增加了施工成本和拼装难度。本文以正舟大桥扩建工程为依托,对拱架和拱圈的联合作用情况进行了研究,通过空间模型对施工过程模拟并与现场实测数据进行比较,作者发现当采用合理分环方案时,先期浇筑的混凝土拱圈可以承受自重的40%以上,这将大大减少拱架数量,节约成本。所以,对采用拱架施工的钢筋混凝土箱形拱桥的受力分析、施工工艺优化以及箱形拱桥的未来建设具有重大应用价值。本文将在正舟大桥扩建工程的基础上,开展以下研究工作:①用大型有限元软件MIDAS/Civil建立符合拱圈现浇施工过程的结构仿真计算模型,结合正舟大桥实测数据,研究先期浇筑形成的拱环与拱架的联合作用,并计算出拱圈与拱架联合作用对整体的贡献度;②以工程实例为基础,调整拱圈分环方案,对比不同施工工艺对拱圈、拱架荷载分配比例的影响;③在保证施工过程中拱架应力在设计允许范围内的情况下,通过合理的分环方案,分析研究拱架与拱圈间联合作用随拱架、拱圈的宽度变化规律并拟合出线性方程;④利用变形反映刚度原理,提出用来估算拱架、拱圈联合作用的荷载分配比例计算公式。本文的研究内容为正舟大桥扩建工程的施工建设提供了安全、可靠的施工方案。同时,利用依托工程对拱架、拱圈的联合作用进行了扩展研究,为今后利用拱架施工的拱桥建设提供了参考依据,具有一定的借鉴意义。
[Abstract]:As reinforced concrete arch bridge has the characteristics of large span capacity, uniform stress distribution, good overall stability, and so on, it has been widely used in mountain areas in the western part of our country. The span of main span is mostly 100-150m.From the point of view of construction, the traffic in mountainous area is not developed, the entrance and exit cost of large lifting equipment is too high or it is difficult to enter the field, it is difficult to adopt cable hoisting construction. Therefore, the construction of arch frame cast-in-place has become a better construction means. The arch frame has a large span capacity, convenient assembly, materials can be recycled many times and can not be affected by floods, and can meet the normal navigation requirements during construction. Therefore, it is especially suitable for the construction of mountain arch bridge. In the past arch frame design, the arch frame bears more than 70% arch ring weight, which will increase the temporary facility cost and increase the use of arch frame. Therefore, the construction cost and assembly difficulty are increased. Based on the expansion project of Zhengzhou Bridge, the combined action of arch frame and arch ring is studied in this paper. Through the space model to simulate the construction process and compare with the field measured data, the author found that the concrete arch ring can bear more than 40% of the self-weight when the reasonable ring dividing scheme is adopted. This will greatly reduce the number of arch frames and save cost. Therefore, the stress analysis of reinforced concrete box arch bridge constructed by arch frame is given. The optimization of construction technology and the future construction of box-shaped arch bridge are of great application value. This paper will be based on the expansion project of Zhengzhou Bridge. The following research work has been carried out: 1. The structure simulation calculation model which accords with the construction process of arch ring cast-in-place is established by using the large-scale finite element software MIDAS/Civil, and combined with the measured data of Zhengzhou Bridge. The joint action of arch ring and arch frame formed by pre-pouring is studied, and the contribution of arch ring and arch frame to the whole is calculated. 2 on the basis of engineering example, adjusting the scheme of ring division of arch ring and comparing the effect of different construction technology on the distribution of load between arch ring and arch frame; (3) under the condition that the stress of arch frame is within the allowable range of design during the construction process, the combined action of arch frame and arch ring with arch frame is analyzed and studied through reasonable ring splitting scheme. The variation law of arch ring width and the linear equation are fitted. (4) based on the principle of deformation reflecting stiffness, a formula for calculating the proportion of load distribution used to estimate the joint action of arch frame and arch ring is put forward. The research content of this paper provides safety for the construction and construction of Zhengzhou Bridge expansion project. At the same time, the research on the joint action of arch frame and arch ring by relying engineering is carried out, which provides a reference basis for the construction of arch bridge using arch frame construction in the future, and has certain reference significance.
【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】：U445.57

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