钢筋混凝土带腹拱斜置坡连拱桥受力性能研究
发布时间：2018-11-15 15:58
【摘要】：拱桥是一种以拱圈作为承重结构的承载桥型，由于结构荷载下，拱脚上水平方向推力和拱圈内力的产生，令结构跨中弯矩大大降低，而且相比于梁桥有着更为合理均匀的应力分布，也为材料发挥强度提供了便利。近年来，城市桥梁景观要求日益提高，多跨连拱桥韵律感强烈，造型优美具有较强的景观性，为了减轻拱上填料自重以及路线需要，钢筋混凝土连拱桥也经常做成带腹拱斜置坡拱桥。由于带腹拱斜置坡连拱桥的受力特点与平置连拱桥的受力有较大区别，这就给施工控制和结构受力分析带来了一定的难度，目前对钢筋混凝土带腹拱斜置坡连拱桥的研究成果较少，因此对这种新桥型进行深入的分析研究是十分必要的。 论文从国外、国内钢筋混凝土拱桥的发展历史入手，剖析归纳了钢筋混凝土拱桥的发展历程和施工方法，以某一座拱脚不等高设计的钢筋混凝土三连拱拱桥为依托工程，对其进行成桥和施工阶段仿真分析，同时，通过MIDAS/CIVIL2012分析了拱脚高差对结构受力性能的影响。本文主要内容及结论如下： 1、介绍了拱桥计算的弹性理论和挠度理论，并简要介绍了连拱简化计算方法，同时概述了有限元模型建立情况，对钢筋混凝土带腹拱斜置板式连拱桥成桥后的关键截面关键点的水平和竖向位移、内部关键位置应力及支座反力等进行了分析。 2、采用桥梁有限元软件Midas对依托工程进行成桥和施工阶段仿真分析，研究发现依托工程结构受力合理，但是主拱圈拱脚位置部分出现较大拉应力，建议严格按照施工方案施工并加强监控、及时反馈。 3、进行现场施工监控，，对关键截面的应力和挠度进行测量并与有限元数据进行对比，研究发现采用有限元对钢筋混凝土带腹拱斜置坡连拱桥进行成桥分析和施工阶段分析与实测情况基本一致，数据可靠。 4、采用有限元软件，选取三组拱脚高差参数对依托工程分别进行内力、位移和拱座反力对比分析，研究发现拱脚高差对拱肋前后2个半拱内力的影响几乎成反对称变化，主腹拱连接处应特别关注，拱脚高差越大对右拱座处结构位移越不利，拱座水平支反力受拱脚高差影响较小。
[Abstract]:Arch bridge is a kind of bearing bridge type with arch ring as load-bearing structure. Due to the horizontal thrust on arch foot and the internal force of arch ring under structural load, the moment in the middle of span of the structure is greatly reduced. Compared with the beam bridge, the stress distribution is more reasonable and uniform, and it also provides convenience for the material to exert its strength. In recent years, the demand of urban bridge landscape is increasing, the rhythm feeling of multi-span multi-arch bridge is strong, the shape of multi-span arch bridge has strong landscape quality, in order to reduce the weight of the packing on the arch and the need of the route, Reinforced concrete arch bridge is also often made with belly arch inclined slope arch bridge. Because the stress characteristics of inclined slope multi-arch bridge with belly arch are different from that of flat arch bridge, it brings some difficulties to construction control and structural stress analysis. At present, the research results of reinforced concrete inclined slope arch bridge with web arch are few, so it is very necessary to deeply analyze and study the new type of bridge. Starting with the development history of reinforced concrete arch bridge abroad and in China, this paper analyzes and sums up the development course and construction method of reinforced concrete arch bridge, which is based on a reinforced concrete three-arch bridge with different design height of arch foot. At the same time, the influence of the arch foot height difference on the mechanical performance of the structure is analyzed by MIDAS/CIVIL2012. The main contents and conclusions of this paper are as follows: 1. The elastic theory and deflection theory of arch bridge calculation are introduced, and the simplified calculation method of multi-arch is briefly introduced, and the establishment of finite element model is summarized. The horizontal and vertical displacement of the key points of the key cross-section, the stress at the key position and the reaction force of the support of the reinforced concrete inclined slab multi-arch bridge with web arch after the completion of the bridge are analyzed in this paper. 2, the bridge finite element software Midas is used to simulate and analyze the bridge and construction stage of the supporting project. It is found that the supporting engineering structure is under reasonable stress, but the main arch ring arch foot is partially subjected to large tensile stress. Suggestion strictly according to the construction plan construction and strengthen the monitoring, timely feedback. The stress and deflection of the key section are measured and compared with the finite element data. It is found that the finite element analysis of reinforced concrete inclined slope arch bridge with web arch is in good agreement with the measured results and the data are reliable. 4. By using finite element software, three groups of parameters of height difference of arch foot are selected to carry out comparative analysis of internal force, displacement and reaction force of arch seat respectively. It is found that the influence of height difference of arch foot on internal force of two half arches before and after arch rib is almost antisymmetric. The greater the height difference of arch foot is, the more disadvantageous is the displacement of the right arch seat, and the reaction force of horizontal support of arch seat is less affected by the arch foot height difference.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.22
本文编号：2333750
[Abstract]:Arch bridge is a kind of bearing bridge type with arch ring as load-bearing structure. Due to the horizontal thrust on arch foot and the internal force of arch ring under structural load, the moment in the middle of span of the structure is greatly reduced. Compared with the beam bridge, the stress distribution is more reasonable and uniform, and it also provides convenience for the material to exert its strength. In recent years, the demand of urban bridge landscape is increasing, the rhythm feeling of multi-span multi-arch bridge is strong, the shape of multi-span arch bridge has strong landscape quality, in order to reduce the weight of the packing on the arch and the need of the route, Reinforced concrete arch bridge is also often made with belly arch inclined slope arch bridge. Because the stress characteristics of inclined slope multi-arch bridge with belly arch are different from that of flat arch bridge, it brings some difficulties to construction control and structural stress analysis. At present, the research results of reinforced concrete inclined slope arch bridge with web arch are few, so it is very necessary to deeply analyze and study the new type of bridge. Starting with the development history of reinforced concrete arch bridge abroad and in China, this paper analyzes and sums up the development course and construction method of reinforced concrete arch bridge, which is based on a reinforced concrete three-arch bridge with different design height of arch foot. At the same time, the influence of the arch foot height difference on the mechanical performance of the structure is analyzed by MIDAS/CIVIL2012. The main contents and conclusions of this paper are as follows: 1. The elastic theory and deflection theory of arch bridge calculation are introduced, and the simplified calculation method of multi-arch is briefly introduced, and the establishment of finite element model is summarized. The horizontal and vertical displacement of the key points of the key cross-section, the stress at the key position and the reaction force of the support of the reinforced concrete inclined slab multi-arch bridge with web arch after the completion of the bridge are analyzed in this paper. 2, the bridge finite element software Midas is used to simulate and analyze the bridge and construction stage of the supporting project. It is found that the supporting engineering structure is under reasonable stress, but the main arch ring arch foot is partially subjected to large tensile stress. Suggestion strictly according to the construction plan construction and strengthen the monitoring, timely feedback. The stress and deflection of the key section are measured and compared with the finite element data. It is found that the finite element analysis of reinforced concrete inclined slope arch bridge with web arch is in good agreement with the measured results and the data are reliable. 4. By using finite element software, three groups of parameters of height difference of arch foot are selected to carry out comparative analysis of internal force, displacement and reaction force of arch seat respectively. It is found that the influence of height difference of arch foot on internal force of two half arches before and after arch rib is almost antisymmetric. The greater the height difference of arch foot is, the more disadvantageous is the displacement of the right arch seat, and the reaction force of horizontal support of arch seat is less affected by the arch foot height difference.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.22
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