大跨轨道斜拉桥合理线形控制关键技术研究

发布时间：2018-04-17 08:34

本文选题：轨道斜拉桥 + 线形控制　；参考：《重庆交通大学》2014年硕士论文

【摘要】：随着轨道交通事业的迅速发展,用于轨道交通的大跨度轨道斜拉桥日趋增多。大跨径轨道斜拉桥合理线形是保证运营期行车舒适性、耐久性甚至安全性的重要方面。混凝土收缩徐变效应属于长期效应,车桥耦合效应属于短期效应,但无论哪种效应都是影响轨道斜拉桥合理线形控制的重要因素,并且这两种效应至今未被完全掌握,桥梁合理线形控制方面也未形成统一的、明确的理论和规范。因此,本文重点对基于收缩徐变效应和车桥耦合效应的合理线形控制关键技术进行研究,通过研究旨在找到合理的收缩徐变模型,找到车桥耦合效应与线形控制的关系,找到合理的轨道桥梁合理线形控制方法,为今后同类桥梁线形控制方法的进一步研究及实桥应用提供一定的依据。本文研究的主要内容和结论包括：①在对混凝土收缩徐变效应各模型和计算方法阐述的基础上,结合实测环境湿度、实测环境温度和实际材料情况,得到了收缩徐变效应的合理预测模型(CEB-FIB90)和合适计算方法。通过大跨轨道斜拉桥混凝土收缩徐变效应的有限元模型计算和实测数据分析表明混凝土收缩徐变效应的实测值与模型预测值相差2cm以内,从而实现对采用的模型的分析与验证；②对列车-轨道-桥梁耦合作用的模型、相互作用、运动方程分析后,结合实桥的动载试验数据,对大跨轨道斜拉桥的动力响应及动力特性指标进行了分析。得到了主桥跨中处最大动位移和最大静位移之比,依据该比值得到了车桥耦合效应与预拱度设置(线形控制)之间的定量关系；③通过状态转移矩阵和预拱度的表达式得到了考虑混凝土收缩徐变和车桥耦合效应的卡尔曼滤波线形控制方法。采用MATLAB数学分析软件对实桥进行编程计算,得到了实桥线形控制的预测值。实桥预拱度和线形的计算值、实测值与预测值的对比分析表明基于混凝土收缩徐变和车桥耦合效应的卡尔曼滤波线形控制方法对大跨轨道斜拉桥合理线形控制效果良好；⑤完成了亚洲第一、世界第二大轨道斜拉桥合理线形控制的分析,验证了上述采用的收缩徐变模型的可靠性,分析了车桥耦合效应对线形控制的影响,分析和验证了考虑混凝土收缩徐变和车桥耦合效应的卡尔曼滤波线形控制方法。
[Abstract]:With the rapid development of rail transportation, the number of long span track cable-stayed bridges used in rail transit is increasing day by day.The reasonable alignment of long span track cable-stayed bridge is an important aspect to ensure the ride comfort, durability and even safety of long span track cable-stayed bridge.Concrete shrinkage and creep effect belong to long-term effect, vehicle-bridge coupling effect belongs to short-term effect, but no matter which kind of effect is the important factor that affects the rational linear control of track cable-stayed bridge, and these two effects have not been fully grasped up to now.There is also no unified, definite theory and standard for the rational linear control of bridges.Therefore, the key technology of linear control based on shrinkage and creep effect and vehicle-bridge coupling effect is studied in this paper. The purpose of this study is to find out a reasonable model of shrinkage and creep, and to find out the relationship between the coupling effect of vehicle and bridge and the linear control.A reasonable linear control method for railway bridges is found, which provides a basis for the further study of similar bridge alignment control methods and the application of real bridges in the future.The main contents and conclusions of this paper include: on the basis of expounding the models and calculation methods of shrinkage and creep effect of concrete, combining with the measured environmental humidity, the measured environmental temperature and the actual material situation,A reasonable prediction model of shrinkage and creep effect, CEB-FIB90, and a suitable calculation method are obtained.Through the finite element model calculation of concrete shrinkage and creep effect of long-span cable-stayed bridge and the analysis of measured data, it is shown that the measured value of concrete shrinkage and creep effect is less than the predicted value of the model 2cm, so that the analysis and verification of the adopted model can be realized.(2) the dynamic response and dynamic characteristics of long span track cable-stayed bridge are analyzed based on the model of train track bridge coupling, the interaction and the equation of motion, and the dynamic load test data of real bridge.The ratio of the maximum dynamic displacement to the maximum static displacement in the middle of the main bridge span is obtained, and the quantitative relationship between the coupling effect of the vehicle and bridge and the setting of the pre-arch degree (linear control) is obtained according to the ratio.(3) through the expressions of state transfer matrix and pre-camber, the Kalman filter linear control method considering concrete shrinkage and creep and vehicle-bridge coupling effect is obtained.The programming calculation of real bridge is carried out by using MATLAB mathematical analysis software, and the predicted value of real bridge linear control is obtained.The comparison and analysis of the calculated values, measured values and predicted values of the pre-camber and alignment of the real bridge show that the Kalman filter linear control method based on concrete shrinkage and creep and vehicle-bridge coupling effect has a good effect on the reasonable linear control of long-span cable-stayed bridge.5. The reasonable linear control of the first and second largest track cable-stayed bridges in Asia and the world is analyzed. The reliability of the above-mentioned shrinkage and creep model is verified, and the influence of vehicle-bridge coupling effect on the linear control is analyzed.The Kalman filter linear control method considering concrete shrinkage and creep and vehicle-bridge coupling effect is analyzed and validated.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4

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