钢管混凝土拱桥无应力状态施工控制研究

发布时间：2018-06-05 02:49

本文选题：施工控制 + 无应力状态法　；参考：《西南交通大学》2015年硕士论文

【摘要】：钢管混凝土拱桥凭借着跨越长度大、造型优美等特点在我国快速发展起来,是较为常用的桥梁结构形式之一。但目前围绕着钢管混凝土拱桥相关的施工控制的研究还相对较少。无应力状态法是施工控制其中的一种计算方法,其利用无应力的状态量将施工的过程和成桥的状态联系起来,具有概念明确、计算便利、施工自由度大等特点。为此对钢管混凝土拱桥采用无应力状态法进行施工控制的相关研究,开展了以下工作：1.阐述了钢管混凝土拱桥的产生与发展的状况,重点介绍了施工控制发展现状的研究以及无应力状态法在施工控制中的应用发展。2.介绍了无应力状态法在施工控制中的基础理论,阐述了两个基本无应力状态量：无应力长度和无应力曲率；陈述了无应力状态法的特点以及相比于其他方法的优点；明确了无应力状态法在钢管混凝土拱桥中的应用思路。3.利用刚性吊杆法确定成桥索力后,通过影响矩阵对索力进行优化,再考虑混凝土收缩徐变和活载的影响后最终得到合理的成桥状态,进而计算出钢管拱和系梁的无应力线形以及吊杆的无应力长度。4.把遗传算法和BP神经网络两种方法相结合,用遗传算法优化后的BP神经网络进行参数的识别工作。5.在论述吊杆的无应力长度发生改变时,分析了不同位置处的吊杆无应力长度的改变在成桥状态时所引起拱肋、系梁以及吊杆索力的改变,并总结了其变化规律特征。6.讨论了钢管拱肋以及系梁的无应力线形突变时对成桥状态的改变,并总结了其变化规律特征。
[Abstract]:Concrete-filled steel tubular (CFST) arch bridge has been developed rapidly in our country by virtue of its long span and graceful shape. It is one of the most commonly used bridge structures. However, the research on construction control of concrete-filled steel tubular arch bridge is relatively rare. The stress-free state method is one of the calculation methods in construction control. It uses the unstressed state quantity to connect the construction process with the state of the bridge, which has the characteristics of clear concept, convenient calculation, large degree of freedom in construction and so on. In this paper, the construction control of concrete-filled steel tubular arch bridge is studied by using stress-free state method, and the following work is carried out: 1. This paper expounds the status of the emergence and development of concrete-filled steel tubular arch bridge, and emphatically introduces the research on the present situation of construction control and the application development of stress-free state method in construction control. This paper introduces the basic theory of stress-free state method in construction control, expounds two basic stress-free state quantities: unstressed length and stress-free curvature, describes the characteristics of stress-free state method and its advantages compared with other methods. The application of stress-free state method in concrete-filled steel tubular arch bridge is clarified. After determining the cable force of the bridge by using the rigid suspender method, the cable force is optimized by the influence matrix, then the influence of concrete shrinkage, creep and live load is considered, and finally the reasonable bridge state is obtained. Furthermore, the unstressed linear shape of steel tube arch and tie beam and the unstressed length of suspender are calculated. The genetic algorithm and BP neural network are combined, and the optimized BP neural network is used to identify the parameters. In this paper, the change of the unstressed length of the suspender is discussed, and the change of the unstressed length of the suspender at different positions is analyzed, which is caused by the change of the arch rib, the tie beam and the cable force of the suspender when the bridge is completed, and the variation law of the cable force is summarized. This paper discusses the change of the bridge state when the steel pipe arch rib and the tie beam are changed by the unstressed linear mutation, and summarizes the characteristics of the changing law.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4

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