钢管混凝土提篮拱桥施工监控与优化技术研究

发布时间：2018-07-08 10:31

本文选题：提篮拱桥 + 施工监控　；参考：《兰州交通大学》2017年硕士论文

【摘要】：钢管混凝土提篮拱桥由于造型美观、自重轻、刚度大和跨越能力强等优点,成为众多桥梁中具备竞争力的桥型之一。随着提篮拱桥的跨径不断增大,施工工艺变得更加复杂,施工难度也会相应地增加,施工监控技术的重要性逐渐凸现出来。本文以新建京沈客专某钢管混凝土提篮拱桥为工程背景,对大桥施工过程进行了监测与控制,研究了成桥阶段吊杆内力识别、调整、优化,对施工阶段拱肋临时支架拆除工序进行了优化分析。主要研究工作如下:(1)对钢管混凝土提篮拱桥的优点和特点进行了简单地概述,并且列举一些近年来国内所建造的钢管混凝土提篮拱桥;阐述了在复杂桥梁施工监测与控制的重要性。(2)介绍了桥梁施工监测控制的方法;根据现场实际情况和大桥特点制定大桥的施工监控内容;采用了正装分析法且借助有限元软件Midas Civil对新建京沈客专某钢管混凝土提篮拱桥的各施工阶段进行仿真分析;通过对实测监控数据与理论数据的对比分析,研究了桥梁主梁和拱肋结构在各个施工阶段的受力特点。(3)采用频率法和千斤顶测定法相结合的测试方法对成桥阶段及调索后的吊杆内力进行了识别;对比分析了影响矩阵法、正装分析法和倒装分析法对于索力调整的优缺点,运用影响矩阵法对成桥吊杆内力调整值进行了计算;对现有吊杆索力优化的方法进行总结;利用有约束的弯曲能量最小法对成桥阶段吊杆内力进行了优化。(4)研究了拱肋临时支架卸落顺序对基本结构应力和线形的影响。根据现场实际情况提出了几种拱肋临时支架卸落方案,通过有限元软件Midas Civil对新建京沈客专某钢管混凝土提篮拱桥拱肋临时支架卸落过程的模拟计算,提出了一种适合本桥的拆架方案。
[Abstract]:Concrete-filled steel tube (CFST) basket arch bridge has become one of the most competitive bridges because of its beautiful shape, light weight, large stiffness and strong span ability. With the increasing span of basket arch bridge, the construction technology becomes more complex, and the construction difficulty will increase accordingly. The importance of construction monitoring technology is gradually emerging. In this paper, based on the engineering background of a new concrete filled steel tube hoisting arch bridge, the construction process of the bridge is monitored and controlled, and the identification, adjustment and optimization of the internal force of the suspender in the stage of completion are studied. The process of removing arch rib temporary support in construction stage is optimized and analyzed. The main research works are as follows: (1) the advantages and characteristics of concrete-filled steel tubular arch bridge are briefly summarized, and some domestic concrete filled steel tube arch bridges are listed. The importance of monitoring and controlling the construction of complex bridges is expounded. (2) the methods of monitoring and control of bridge construction are introduced, and the construction monitoring contents of the bridge are formulated according to the actual situation of the site and the characteristics of the bridge. In this paper, the formal dress analysis method and the finite element software Midas Civil are used to simulate and analyze the construction stages of a new concrete filled steel tube hoist arch bridge, and the comparison between the measured monitoring data and the theoretical data is carried out. The stress characteristics of the bridge main beam and arch rib structure in each construction stage are studied. (3) the internal force of the suspender in the bridge stage and after the cable adjustment is identified by the method of frequency and Jack measurement, and the influence matrix method is compared and analyzed. For the advantages and disadvantages of cable force adjustment, the influence matrix method is used to calculate the adjustment value of the internal force of the suspension rod, and the existing optimization methods of the cable force of the suspension rod are summarized. The constrained bending energy minimization method is used to optimize the internal force of the suspender in the stage of bridge completion. (4) the influence of the unloading sequence of the arch rib temporary support on the basic structural stress and the alignment is studied. According to the actual situation on the spot, several kinds of temporary support unloading schemes of arch rib are put forward, and the simulation calculation of the unloading process of temporary support of arch rib of a new concrete filled steel tube hoist arch bridge is carried out by the finite element software Midas Civil. A scheme for removing the bridge is presented.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4;U448.22

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