敞开式钢管—混凝土桁架组合梁桥节点疲劳性能试验研究
发布时间：2018-07-16 22:06
【摘要】：论文首先概述了桁架梁桥的基本概念以及钢管混凝土的优点，在此基础上提出了钢管混凝土桁架组合梁桥，并对其发展和前景做出展望；简单介绍了剪力连接件的分类及国内外发展研究情况；以及组合结构节点疲劳的现状，及疲劳的基本理论。 其次，论文以徐明高速怀洪新河二号特大桥60m跨堤引桥为工程背景，依据施工图纸及施工方案等资料，运用大型有限元计算软件MIDAS/CIVIL建立基于梁单元的全桥空间有限元模型。对桥梁成桥运营阶段进行静力分析，详细计算分析不同荷载工况下桥梁上部结构的受力行为，根据分析结果得出敞开式钢管-混凝土桁架组合梁桥在实际使用过程中危险节点的位置。 第三，，论文结合模型计算结果与现场监控数据，选择桁架梁桥中的危险节点进行足尺寸的疲劳性能试验。对节点模型分别进行了静力试验和200万次的疲劳试验。200万次疲劳加载后，试验模型未出现破坏迹象，节点满足设计要求。 最后，MIDAS/FEA建立敞开式钢管-混凝土桁架组合梁桥节点疲劳试验所研究的节点的细部模型。通过模型计算出的应力数据与试验实测数据进行比较分析，确保有限元模型的准确性。然后，加大模型中的荷载，计算出该节点在200次疲劳下的极限承载力远大于其设计值。
[Abstract]:In this paper, the basic concept of truss girder bridge and the advantages of concrete-filled steel tube (CFST) are summarized, and the development and prospect of CFST composite girder bridge are discussed. This paper briefly introduces the classification of shear connectors and their development at home and abroad, as well as the present situation of joint fatigue of composite structures, and the basic theory of fatigue. Secondly, based on the construction drawings and construction plans of the 60m approach bridge of Xuming expressway Huai Hongxin River Bridge No. 2, the spatial finite element model of the whole bridge based on beam element is established by using Midas / CIVIL, a large-scale finite element calculation software. The static analysis of the bridge operation stage is carried out, and the stress behavior of the superstructure under different load conditions is calculated and analyzed in detail. According to the analysis results, the position of the dangerous joints of the open steel tube-concrete truss composite beam bridge is obtained. Thirdly, combined with the results of model calculation and field monitoring data, the paper selects the dangerous nodes in truss girder bridge to carry out fatigue performance tests with sufficient size. Static tests and 2 million fatigue tests were carried out on the joint model. After 2 million times of fatigue loading, the test model showed no signs of failure, and the joints met the design requirements. Finally, MIDAS-FEA establishes the detailed model of joint fatigue test of open steel-tube / concrete truss composite beam bridge. In order to ensure the accuracy of the finite element model, the stress data calculated by the model are compared with the measured data. Then, by increasing the load in the model, the ultimate bearing capacity of the joint under 200 fatigue cycles is calculated to be much larger than its design value.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.4
本文编号：2127811
[Abstract]:In this paper, the basic concept of truss girder bridge and the advantages of concrete-filled steel tube (CFST) are summarized, and the development and prospect of CFST composite girder bridge are discussed. This paper briefly introduces the classification of shear connectors and their development at home and abroad, as well as the present situation of joint fatigue of composite structures, and the basic theory of fatigue. Secondly, based on the construction drawings and construction plans of the 60m approach bridge of Xuming expressway Huai Hongxin River Bridge No. 2, the spatial finite element model of the whole bridge based on beam element is established by using Midas / CIVIL, a large-scale finite element calculation software. The static analysis of the bridge operation stage is carried out, and the stress behavior of the superstructure under different load conditions is calculated and analyzed in detail. According to the analysis results, the position of the dangerous joints of the open steel tube-concrete truss composite beam bridge is obtained. Thirdly, combined with the results of model calculation and field monitoring data, the paper selects the dangerous nodes in truss girder bridge to carry out fatigue performance tests with sufficient size. Static tests and 2 million fatigue tests were carried out on the joint model. After 2 million times of fatigue loading, the test model showed no signs of failure, and the joints met the design requirements. Finally, MIDAS-FEA establishes the detailed model of joint fatigue test of open steel-tube / concrete truss composite beam bridge. In order to ensure the accuracy of the finite element model, the stress data calculated by the model are compared with the measured data. Then, by increasing the load in the model, the ultimate bearing capacity of the joint under 200 fatigue cycles is calculated to be much larger than its design value.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.4
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