宁西复线铁路赵河特大桥主桥施工监控研究

发布时间：2018-06-18 07:49

本文选题：钢管混凝土拱桥 + 灌注顺序　；参考：《郑州大学》2015年硕士论文

【摘要】：钢管混凝土拱桥具有承载能力大、自重轻、桥型美观、施工便捷,适宜建造大跨度桥梁等优点,近年来在我国的桥梁工程中得到了广泛运用。钢管混凝土拱桥施工过程复杂且影响因素多,为了保证桥梁顺利建成并符合设计要求,需要对其进行施工监控。本文以宁西铁路西安?南阳段增建第二线赵河特大桥主桥——跨径64m钢管混凝土系杆拱桥为依托工程,建立桥梁有限元计算模型开展现场施工监控,同时为保证桥梁施工监控取得较好的效果,就拱肋混凝土的灌注顺序、结构参数的敏感性及其识别进行了分析研究。主要内容有:(1)利用有限元软件Midas/civil建立计算模型,采用施工阶段联合截面模拟钢管混凝土拱肋,就拱肋灌注这一关键施工过程进行模拟计算,对比分析不同灌注顺序对拱肋的应力及变形的影响,确定赵河桥拱肋的合理灌注顺序。(2)以赵河桥系梁的变形为控制目标,对结构参数进行敏感性分析,比较各结构参数对控制目标的影响程度,确定主要结构参数。(3)结合赵河桥的结构特点和施工工艺,制定适合本桥的施工监控方案,对赵河桥施工过程中系梁的应力及变形、拱肋的应力及变形、吊杆索力、环境温度进行现场监测。(4)实施桥梁施工监控,采用最小二乘法对主要结构参数进行识别,根据参数识别的结果对计算模型进行修正,对比分析各施工阶段下结构状态的理论计算值与现场实测值。结果表明:赵河桥系梁和拱肋各关键截面的应力及变形、吊杆索力的实测值与理论值的偏差较小,施工监控效果良好。
[Abstract]:The concrete filled steel tube arch bridge has the advantages of large bearing capacity, light weight, beautiful bridge type, convenient construction and suitable for the construction of long-span bridges. In recent years, it has been widely used in the bridge engineering in China. The construction process of the concrete filled steel tube arch bridge is complex and has many factors. In order to ensure the smooth completion of the bridge and meet the design requirements, it needs to be introduced into the bridge. In this paper, based on the main bridge of the second line of the Xi'an and Nanyang section of Ningxi railway, the main bridge of the second line of Zhao he bridge, the span 64M steel tube concrete tied arch bridge is supported by the project, the bridge finite element calculation model is set up to carry out the site construction monitoring. At the same time, the better effect of the bridge construction monitoring is achieved. The sequence of the concrete in the arch rib is given. The sensitivity and identification of the structure parameters are analyzed and studied. The main contents are as follows: (1) using the finite element software Midas/civil to establish the calculation model, using the joint section of the construction stage to simulate the steel tube concrete arch rib, the key construction process of the arch rib perfusion is simulated, and the stress and deformation of the arch ribs with different perfusion sequence are compared and analyzed. The rational perfusion sequence of the bridge arch rib of the Zhao river is determined. (2) taking the deformation of the Zhao river bridge system beam as the control target, the sensitivity analysis of the structural parameters is carried out, the influence degree of the structural parameters on the control target is compared and the main structural parameters are determined. (3) the construction monitoring party suitable for the bridge is formulated in combination with the construction characteristics and construction technology of the Zhao River Bridge. The stress and deformation of the beam in the construction process of Zhao he bridge, the stress and deformation of the arch rib, the cable force of the hanger, the environment temperature are monitored in the field. (4) the construction monitoring of the bridge is carried out, the main structural parameters are identified by the least square method, and the calculation model is amended according to the results of the parameter identification, and the structure under each construction phase is compared and analyzed. The theoretical calculation and field measured values show that the stress and deformation of the key sections of the beam and arch ribs of the Zhao River Bridge, the deviation between the measured value of the cable force of the hanger and the theoretical value is small, and the effect of the construction monitoring is good.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4

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