1-128m系杆拱桥成桥及施工阶段索力优化研究
发布时间：2018-07-14 21:11
【摘要】：在系杆拱桥的组成构件中，吊杆是桥面与拱肋联系的传递构件。桥面系的恒活载都是通过吊杆传递给拱肋的，吊杆索力值影响着整个结构的受力。桥梁结构的体系确定之后，结构的受力主要是由吊杆索力值来决定，可以通过调节吊杆索力值来改变结构的受力状态。因此进行系杆拱桥索力优化对结构受力来讲是很有必要的。系杆拱桥的索力优化不仅要满足成桥状态受力合理，还要保证施工及运营阶段的安全，故进行施工阶段合理索力确定也是很重要的。 本文以跨乌鲁木齐河特大桥1-128m系杆拱桥施工监控为工程背景，对其成桥状态下的合理恒载索力进行了优化研究，探讨分析了施工阶段的合理施工索力，主要进行了如下工作： （1）阐述了系杆拱桥的分类和特点，简要介绍了索力优化的概念。 （2）介绍了跨乌鲁木齐河特大桥1-128m系杆拱桥有限元模型建立过程，利用有限元软件Midas/Civil建立计算模型。总结了近年来成桥恒载索力优化方法研究现状，并对各种方法进行了对比，分析了其优缺点。总结归纳了系杆拱桥合理施工索力确定的方法，并对每种方法进行了评述。 （3）运用有约束的最小能量法来进行跨乌鲁木齐河特大桥1-128m系杆拱桥索力优化，目标函数选系杆拱桥主梁和拱肋的拉压及弯曲应变能之和，以吊杆索力上下限及主梁弯矩为约束条件，利用二次规划法对成桥吊杆力进行调整，借助Matlab优化工具箱来编写计算程序进行求解，从而求得满足控制条件的合理成桥索力。 （4）以刚性支承连续梁法计算确定吊杆初次张拉索力，并对计算结果进行了分析，指出了算法的不合理性；拟定了两种吊杆张拉顺序，，利用正装迭代法计算吊杆合理施工索力，对计算结果进行分析，探讨了不同张拉顺序的优缺点；运用影响矩阵法来确定施工阶段第二次吊杆张拉力，成功实现了吊杆仅需要张拉两次就可以使吊杆索力达到成桥设计值。 （5）阐述了相似理论的概念；根据相似理论，按1/16的相似比制作了跨乌鲁木齐河特大桥1-128m系杆拱桥缩尺模型，对缩尺模型进行合理成桥索力及合理施工索力确定；经过缩尺模型索力张拉试验，采集索力及应力数据，对实测值与理论值进行比较。 最后对本文的主要结论和创新点进行了阐述，且对未来的研究工作进行了展望。
[Abstract]:In the component of tied arch bridge, the suspender is the transfer member of the connection between deck and arch rib. The dead load of bridge deck system is transmitted to the arch rib through the suspender, and the cable force of the suspender affects the force of the whole structure. After the system of bridge structure is determined, the force of the structure is mainly determined by the cable force value of the suspension rod, and the stress state of the structure can be changed by adjusting the cable force value of the suspension rod. Therefore, it is necessary to optimize the cable force of tied arch bridge. The optimization of cable force of tied arch bridge should not only satisfy the reasonable state of the bridge, but also ensure the safety of the construction and operation stage, so it is also very important to determine the reasonable cable force in the construction stage. In this paper, based on the engineering background of construction monitoring of 1-128m tied arch bridge across Urumqi River, the rational dead load cable force under the condition of the completed bridge is studied optimally, and the reasonable construction cable force in the construction stage is discussed and analyzed. The main works are as follows: (1) the classification and characteristics of tied arch bridge are expounded, and the concept of cable force optimization is briefly introduced. (2) the process of establishing finite element model of 1-128m tied arch bridge over Urumqi River is introduced. The finite element software Midas / Civil is used to build the calculation model. This paper summarizes the research status of cable force optimization method of bridge under dead load in recent years, compares various methods, and analyzes their advantages and disadvantages. This paper summarizes and summarizes the methods of determining the rational construction cable force of tied arch bridge, and comments on each method. (3) using the constrained minimum energy method to optimize the cable force of 1-128m tied arch bridge over Urumqi River Bridge. The objective function is to select the sum of tension and compression and bending strain energy of the main girder and arch rib of tied arch bridge. With the upper and lower limits of cable force of suspension rod and the moment of main beam as the constraint conditions, the suspension force of the bridge is adjusted by quadratic programming method. With the help of Matlab optimization toolbox, the calculation program is compiled to solve the problem, so as to obtain the reasonable cable force of the bridge which meets the control conditions. (4) the initial tension force of the suspension rod is determined by the rigid support continuous beam method, and the calculation results are analyzed. The irrationality of the algorithm is pointed out, the tension sequence of two kinds of suspenders is drawn up, the rational construction cable force is calculated by means of formal iteration method, the calculation results are analyzed, and the advantages and disadvantages of different tension sequences are discussed. The influence matrix method is used to determine the second tension of the suspension rod in the construction stage, and it is successfully realized that the cable force of the suspender can reach the design value of the bridge with only two tensionings. (5) the concept of the similarity theory is expounded, according to the similarity theory, the cable force of the suspension rod can reach the design value of the bridge. According to the similarity ratio of 1 / 16, the scale model of 1-128m tied arch bridge of Urumqi River Bridge is made, and the rational cable force and construction cable force of the scale model are determined, and the cable force and stress data are collected through the cable tension test of the scale model. The measured values are compared with the theoretical values. Finally, the main conclusions and innovations of this paper are described, and the future research work is prospected.
【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
[Abstract]:In the component of tied arch bridge, the suspender is the transfer member of the connection between deck and arch rib. The dead load of bridge deck system is transmitted to the arch rib through the suspender, and the cable force of the suspender affects the force of the whole structure. After the system of bridge structure is determined, the force of the structure is mainly determined by the cable force value of the suspension rod, and the stress state of the structure can be changed by adjusting the cable force value of the suspension rod. Therefore, it is necessary to optimize the cable force of tied arch bridge. The optimization of cable force of tied arch bridge should not only satisfy the reasonable state of the bridge, but also ensure the safety of the construction and operation stage, so it is also very important to determine the reasonable cable force in the construction stage. In this paper, based on the engineering background of construction monitoring of 1-128m tied arch bridge across Urumqi River, the rational dead load cable force under the condition of the completed bridge is studied optimally, and the reasonable construction cable force in the construction stage is discussed and analyzed. The main works are as follows: (1) the classification and characteristics of tied arch bridge are expounded, and the concept of cable force optimization is briefly introduced. (2) the process of establishing finite element model of 1-128m tied arch bridge over Urumqi River is introduced. The finite element software Midas / Civil is used to build the calculation model. This paper summarizes the research status of cable force optimization method of bridge under dead load in recent years, compares various methods, and analyzes their advantages and disadvantages. This paper summarizes and summarizes the methods of determining the rational construction cable force of tied arch bridge, and comments on each method. (3) using the constrained minimum energy method to optimize the cable force of 1-128m tied arch bridge over Urumqi River Bridge. The objective function is to select the sum of tension and compression and bending strain energy of the main girder and arch rib of tied arch bridge. With the upper and lower limits of cable force of suspension rod and the moment of main beam as the constraint conditions, the suspension force of the bridge is adjusted by quadratic programming method. With the help of Matlab optimization toolbox, the calculation program is compiled to solve the problem, so as to obtain the reasonable cable force of the bridge which meets the control conditions. (4) the initial tension force of the suspension rod is determined by the rigid support continuous beam method, and the calculation results are analyzed. The irrationality of the algorithm is pointed out, the tension sequence of two kinds of suspenders is drawn up, the rational construction cable force is calculated by means of formal iteration method, the calculation results are analyzed, and the advantages and disadvantages of different tension sequences are discussed. The influence matrix method is used to determine the second tension of the suspension rod in the construction stage, and it is successfully realized that the cable force of the suspender can reach the design value of the bridge with only two tensionings. (5) the concept of the similarity theory is expounded, according to the similarity theory, the cable force of the suspension rod can reach the design value of the bridge. According to the similarity ratio of 1 / 16, the scale model of 1-128m tied arch bridge of Urumqi River Bridge is made, and the rational cable force and construction cable force of the scale model are determined, and the cable force and stress data are collected through the cable tension test of the scale model. The measured values are compared with the theoretical values. Finally, the main conclusions and innovations of this paper are described, and the future research work is prospected.
【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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