钦江特大桥128m下承式系杆拱桥施工监控技术研究

发布时间：2018-07-07 16:08

本文选题：下承式系杆拱桥 + 有限元理论　；参考：《兰州交通大学》2014年硕士论文

【摘要】：下承式系杆拱桥将梁、拱两种结构有机结合，以其受力合理、刚度大、造型优美而受到桥梁界的普遍欢迎。论文以广西沿海铁路扩能改造工程钦江特大桥主桥128m钢管混凝土系杆拱桥为背景展开施工监控研究，主要研究内容如下： (1)概括介绍了国内外下承式系杆拱桥的发展现状及发展趋势，对下承式系杆拱桥的受力特点及目前存在的问题进行了详细阐述并引出了基于有限元理论的下承式系杆拱桥的分析原则和施工控制的相关理论。 (2)采用自适应控制法对钦江桥的主梁线形进行监测，利用最小二乘法对本桥主要参数进行识别，并对梁体变形作出预测，从而确定立模标高；通过对影响拱肋预拱度的因素和设置方法进行对比分析，结合工程实际和相关计算方法给出钦江桥的拱肋预拱度；最后通过对各个施工阶段的实测线形和计算结果对比分析得出主梁、拱肋满足设计线形要求。 (3)钦江桥的混凝土应力和钢管拱肋表面应力监测分别采用JMZX-422AT记忆温度型钢筋应力计和JMZX-416型智能数码弦式应变计；利用成熟理论对测试数据进行分析处理得出混凝土的收缩、徐变引起的结构非受力部分应变可占到全部应变的30%～40%。 (4)利用ANSYS实体单元对拱脚局部应力进行分析得出钦江拱脚结构整体上受力合理；其中建议设计施工时可适当沿着拱脚表面对拱脚进行加强。 (5)对现有合理的施工索力确定方法和索力测试法进行相关探讨，，综合实际情况对比分析，分别选取影响矩阵法和频率法作为钦江桥调索和索力测试的理论依据，最终成桥索力值与设计值以5%以内的误差说明了本桥采用的影响矩阵作为调索理论的合理性。
[Abstract]:The through tie arch bridge combines the beam and arch structure organically, and is generally welcomed by the bridge because of its reasonable force, large stiffness and graceful shape. Based on the 128m CFST tied arch bridge of Qinjiang super bridge in Guangxi coastal railway capacity expansion project, the construction monitoring and control research is carried out in this paper. The main research contents are as follows: (1) the present situation and development trend of the through tie arch bridge at home and abroad are introduced. The stress characteristics and existing problems of through tied arch bridge are expounded in detail, and the analysis principle and construction control theory of through tie arch bridge based on finite element theory are introduced. Adaptive control method is used to monitor the alignment of the main beam of Qinjiang Bridge. The main parameters of the bridge are identified by using the least square method, and the deformation of the beam body is forecasted so as to determine the elevation of the vertical die, and the factors affecting the pre-arch degree of the arch rib and the setting method are compared and analyzed. Combined with engineering practice and related calculation method, the arch rib pre-arch degree of Qinjiang Bridge is given. Finally, the main beam is obtained by comparing and analyzing the measured alignment and calculation results of each construction stage. (3) the concrete stress of Qinjiang Bridge and the surface stress of steel pipe arch rib are monitored by JMZX-422AT memory temperature stress meter and JMZX-416 intelligent digital string strain gauge; The shrinkage of concrete is obtained by using mature theory to analyze and deal with the test data. The non-stress partial strain of the structure caused by creep can account for 30% of the total strain. (4) by using ANSYS solid element to analyze the local stress of arch foot, it is concluded that the overall stress of Qinjiang arch foot structure is reasonable. It is suggested that the arch foot should be strengthened properly along the surface of the arch foot in design and construction. (5) the existing reasonable methods for determining the cable force and the test method for the cable force should be discussed, and the actual situation should be compared and analyzed synthetically. The influence matrix method and the frequency method are selected as the theoretical basis for cable adjustment and cable force test of Qinjiang Bridge respectively. Finally, the error between the cable force value and the design value of the bridge is less than 5%, which shows the rationality of the influence matrix used in this bridge as the cable adjustment theory.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4;U448.225

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