钢管混凝土拱桥施工控制及优化分析

发布时间：2019-02-19 14:55

【摘要】：钢管混凝土拱桥造型优美，受力合理，施工方便，近些年在国内外得到了迅速的发展。随着钢管混凝土拱桥跨度逐步加大和结构越来越复杂，施工难度也逐步增加。为确保成桥状态满足设计要求，在施工过程中采取施工控制显得尤为重要。本文以钦州钦江特大桥为工程背景，对施工控制过程中的关键问题进行了研究，主要内容如下：（1）简要介绍了钢管混凝土拱桥的发展历程、研究现状以及存在的若干问题，简述了钢管混凝土拱桥的发展前景。总结了对大型桥梁实行施工监控的目的意义，还有施工监控的理论和方法。（2）从介绍拱桥的施工方法入手，分析了各种施工方法与适用范围，结合钦江特大桥详细介绍了斜拉挂扣法的施工步骤，包括拱肋架设方法和混凝土灌注方法。（3）简述了钢管混凝土拱桥的施工计算方法和理论。结合钦江特大桥介绍了需要进行施工计算的内容. （4）阐述了钢管混凝土拱桥的施工控制分析方法。详细介绍了本文所要用的BP神经网络和遗传算法优化的原理和步骤。（5）以钦江特大桥为工程背景，采用正交试验设计方法对本文索要优化的扣索索力进行正交设计，将正交设计出来的每一组扣索索力带入MIDAS模型当中计算，得到多组输入输出样本。以扣索索力作为输入样本，，控制截面的位移作为输出样本，采用BP神经网络对这些样本进行训练，并结合遗传算法寻找出最优索力。将遗传算法得到的最优索力反带入模型，比较神经网络训练出来的结果和模型计算出的结果，验证本文的索力优化方法是合理有效的，满足精度要求。（6）提出两种不同灌注顺序，并从弦杆的应力储备和灌注过程中的稳定性方面分析两种灌注顺序。（7）分析对比钦江特大桥施工过程中位移和应力的实测值和和设计值，表明优化结果满足施工控制需要。
[Abstract]:The steel tube concrete arch bridge is beautiful in shape, reasonable in stress and convenient to construct, and has been developed rapidly and abroad in recent years. As the span of the steel pipe concrete arch bridge is gradually increased and the structure is becoming more and more complex, the construction difficulty is gradually increased. In order to ensure that the bridge state meets the design requirements, it is particularly important to take the construction control during the construction process. Taking the Qinzhou Qinjiang River Bridge as the engineering background, the key problems in the construction control process are studied. The main contents are as follows: (1) The development course, the present situation and the existing problems of the CFST arch bridge are introduced in brief. In this paper, the development of CFST arch bridge is described. The purpose of the construction monitoring for large-scale bridges is summarized, and the theory and party of construction monitoring are also discussed. (2) Starting with the introduction of the construction method of the arch bridge, the construction method and the application scope of the arch bridge are analyzed, and the construction steps of the pull-and-pull method are described in detail in connection with the Qinjiang River Bridge, including the method for erecting the arch rib and the concrete pouring. (3) The construction and calculation of the CFST arch bridge are briefly described. Methods and theories. The construction is introduced in combination with the Qinjiang River Bridge. The application of steel pipe concrete arch bridge is described in (4). The paper introduces the BP neural network and the genetic algorithm to be used in this paper. (5) Based on the engineering background of the Qinjiang River Bridge, the orthogonal design method is adopted to design the optimized buckling cable force in this paper, and each set of buckling cables designed by the orthogonal design is brought into the MIDAS model to be calculated. and using the BP neural network to train the samples, and combining with the genetic algorithm, The optimal cable force is found by the algorithm. The optimal cable force obtained by the genetic algorithm is brought into the model, and the results of the neural network training and the results calculated by the model are compared. It is effective to meet the requirements of precision. (6) Two different perfusion sequences are proposed, and the stability of the stress and the perfusion of the chord is obtained. (7) Analysis of the measured value and design value of displacement and stress in the construction process of the comparative Qinjiang River Bridge, and the table
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4;U448.22

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