悬拼钢筋混凝土箱拱合理施工索力与拱轴线的优化研究
发布时间：2018-10-21 13:48
【摘要】：不同形式的拱桥有其特有的合理成桥状态,不同方法施工的拱桥,其合理施工状态也并非单一不变。拱桥合理成桥及合理施工状态的确定包含了许多设计和施工参数的优化,把极其关键的两个点作为本文研究的主要内容——合理施工阶段索力及合理拱轴线形的计算优化。本文依托国家自然科学基金资助项目《基于多目标优化的悬浇混凝土拱桥构形与安全控制的理论与方法》,以贵州省龙场渡槽(主拱圈变宽、净跨径200m)为背景,具体的研究工作主要有以下几个方面:(1)对国内外钢筋混凝土拱桥的发展进行了综述,阐述了几种主要的施工方法,并对现有缆索吊装斜拉扣挂法施工拱桥存在的问题进行了简要分析,最后提出了本文研究的主要内容。(2)在确定合理施工状态时,从施工阶段参数、结构实际受力状态、施工阶段扣索索力确定等方面进行了阐明;在确定合理成桥状态时,主要从主拱圈合理拱轴线、主拱圈合理成桥状态、合理成桥扣索索力确定这几个方面进行了归纳。(3)提出了“一张索力通过静力平衡确定,二张索力以调整内力为主”的索力多次张拉控制思想;本桥采用了当前节段吊装多次张拉的方法进行吊装阶段索力控制,节段吊装完成后不再进行索力调整。(4)合理施工索力计算及优化过程中,采用基于影响矩阵的未知荷载系数法在Midas Civil有限元软件中进行了合理施工索力的优化。通过频率法实测的索力数据及主拱圈控制截面的实测应力与理论数据的对比分析,验证了该方法优化得到的索力是合理且施工中易于实现的。(5)探讨了数值法在变截面主拱圈内力计算中的应用,计算过程中主要解决了两个问题:变截面主拱圈自重对应的力臂进行了形心的修正,避免了一般数值方法采用微元段中点造成的内力偏差;变宽主拱圈面积函数的确定。(6)提供了一种利用MATLAB编程工具进行变截面拱轴系数优化的思路,并给出了MATLAB拟合程序。根据工程中拱圈变宽、悬臂拼装的设计及施工特点,采用三次样条差值作为逼近函数对拱轴线进行了拟合,通过优化,拱轴线更加合理。
[Abstract]:Different types of arch bridges have their unique reasonable state of bridge construction, and the reasonable construction state of different methods of arch bridges is not a single one. The determination of reasonable bridge completion and reasonable construction state of arch bridge includes the optimization of many design and construction parameters. The two key points are considered as the main contents of this paper-the calculation and optimization of the rational cable force and the rational arch axis in the reasonable construction stage. Based on the project supported by the National Natural Science Foundation of China, "Theory and method of configuration and safety control of cantilever concrete arch bridge based on multi-objective optimization", this paper takes Longchang Aqueduct in Guizhou Province as the background, with the main arch circle becoming wider and the net span 200 m. The specific research work mainly includes the following aspects: (1) the development of reinforced concrete arch bridge at home and abroad is summarized and several main construction methods are expounded. At last, the main contents of this paper are put forward. (2) in order to determine the reasonable construction state, the parameters of the construction stage and the actual stress state of the structure are analyzed. In the process of construction, the determination of cable tension is expounded, and the reasonable arch axis of the main arch ring and the reasonable bridge state of the main arch ring in determining the reasonable state of the bridge are determined. The rational determination of cable force of bridge buckle is summarized. (3) the cable force is determined by static balance and the main force of two cables is to adjust the internal force. This bridge adopts the method of current segment hoisting and multiple tensioning to control the cable force in the hoisting stage, and the cable force adjustment is not carried out after the segmental lifting is completed. (4) in the process of rational construction cable force calculation and optimization, The unknown load coefficient method based on influence matrix is used to optimize the rational construction cable force in Midas Civil finite element software. Through the comparison and analysis between the measured cable force data measured by the frequency method and the measured stress of the control section of the main arch ring and the theoretical data, It is verified that the cable force obtained by this method is reasonable and easy to be realized in construction. (5) the application of numerical method to the calculation of internal force of the main arch ring with variable section is discussed. In the course of calculation, two main problems are solved: the force arm corresponding to the self-weight of the main arch ring with variable section is corrected by the centroid, which avoids the deviation of internal force caused by the midpoint of the micro-element section in the general numerical method; The determination of the area function of the main arch ring with variable width. (6) A method to optimize the coefficient of the arch axis with variable section by using MATLAB programming tool is provided, and the MATLAB fitting program is given. According to the design and construction characteristics of arch ring widening and cantilever assembly the cubic spline difference is used as the approximation function to fit the arch axis. Through optimization the arch axis is more reasonable.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4
[Abstract]:Different types of arch bridges have their unique reasonable state of bridge construction, and the reasonable construction state of different methods of arch bridges is not a single one. The determination of reasonable bridge completion and reasonable construction state of arch bridge includes the optimization of many design and construction parameters. The two key points are considered as the main contents of this paper-the calculation and optimization of the rational cable force and the rational arch axis in the reasonable construction stage. Based on the project supported by the National Natural Science Foundation of China, "Theory and method of configuration and safety control of cantilever concrete arch bridge based on multi-objective optimization", this paper takes Longchang Aqueduct in Guizhou Province as the background, with the main arch circle becoming wider and the net span 200 m. The specific research work mainly includes the following aspects: (1) the development of reinforced concrete arch bridge at home and abroad is summarized and several main construction methods are expounded. At last, the main contents of this paper are put forward. (2) in order to determine the reasonable construction state, the parameters of the construction stage and the actual stress state of the structure are analyzed. In the process of construction, the determination of cable tension is expounded, and the reasonable arch axis of the main arch ring and the reasonable bridge state of the main arch ring in determining the reasonable state of the bridge are determined. The rational determination of cable force of bridge buckle is summarized. (3) the cable force is determined by static balance and the main force of two cables is to adjust the internal force. This bridge adopts the method of current segment hoisting and multiple tensioning to control the cable force in the hoisting stage, and the cable force adjustment is not carried out after the segmental lifting is completed. (4) in the process of rational construction cable force calculation and optimization, The unknown load coefficient method based on influence matrix is used to optimize the rational construction cable force in Midas Civil finite element software. Through the comparison and analysis between the measured cable force data measured by the frequency method and the measured stress of the control section of the main arch ring and the theoretical data, It is verified that the cable force obtained by this method is reasonable and easy to be realized in construction. (5) the application of numerical method to the calculation of internal force of the main arch ring with variable section is discussed. In the course of calculation, two main problems are solved: the force arm corresponding to the self-weight of the main arch ring with variable section is corrected by the centroid, which avoids the deviation of internal force caused by the midpoint of the micro-element section in the general numerical method; The determination of the area function of the main arch ring with variable width. (6) A method to optimize the coefficient of the arch axis with variable section by using MATLAB programming tool is provided, and the MATLAB fitting program is given. According to the design and construction characteristics of arch ring widening and cantilever assembly the cubic spline difference is used as the approximation function to fit the arch axis. Through optimization the arch axis is more reasonable.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4
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