基于遗传算法的连续刚构桥主梁设计参数优化研究

发布时间：2018-05-09 14:53

本文选题：连续刚构桥 + 主梁设计参数　；参考：《昆明理工大学》2015年硕士论文

【摘要】：预应力混凝土连续刚构桥是一种具有整体性好、受力合理、施工技术成熟、造价适中、跨越能力较强和行车舒适等优点的桥型,在实际工程中得到了大量的应用,同时进一步发展前景也非常广阔。经过长期的设计实践,连续刚构桥的设计参数得到了逐渐的发展和优化。但是连续刚构桥的分析过程复杂,设计参数众多,难以对其进行系统而全面的科学分析。同时由于缺乏系统的理论指导,设计工作往往凭借经验进行,因此不仅设计具有较强的主观性,而且工作量大、精确度也不高。所以在预应力混凝土连续刚构桥的研究中,根据已有研究成果,对主要参数进一步优化研究是必要的。本文以云南省某连续刚构桥作为工程背景,通过使用数值分析、正交试验和遗传算法对主梁设计参数的优化进行了研究,主要完成了以下工作：(1)介绍了国内外预应力混凝土连续刚构桥的发展历程与研究现状,并选取主梁参数中的边中跨比、根部梁高高跨比、跨中梁高高跨比、梁底曲线线形四个参数作为变量,其他设计参数为常量进行分析。(2)采用数值分析方法和正交试验法结合的方法,以主梁的内力、应力、挠度、混凝土用量等作为指标,建立2组共26个桥梁有限元模型。通过对计算结果的分析,得出了有利于提高主梁跨中性能的参数组合方式。(3)介绍了启发式算法的发展历程及遗传算法的工作原理。在正交试验优化成果的基础上,采用遗传算法进行进一步寻优计算。建立了另外一组16个有限元模型计算,并对计算结果使用MATLAB遗传算法工具箱实现优化,得到更为精确参数组合方式,并与正交试验法相互印证。
[Abstract]:Prestressed concrete continuous rigid frame bridge is a kind of bridge which has the advantages of good integrity, reasonable force, mature construction technology, moderate cost, strong span ability and comfortable driving. It has been widely used in practical engineering. At the same time, the prospects for further development are also very broad. After long-term design practice, the design parameters of continuous rigid frame bridge have been gradually developed and optimized. However, the analysis process of continuous rigid frame bridge is complex and the design parameters are numerous, so it is difficult to carry out systematic and comprehensive scientific analysis of continuous rigid frame bridge. At the same time, because of the lack of systematic theoretical guidance, the design work is often carried out by experience, so the design not only has strong subjectivity, but also has a large workload and low accuracy. Therefore, in the study of prestressed concrete continuous rigid frame bridge, it is necessary to further optimize the main parameters according to the existing research results. In this paper, based on a continuous rigid frame bridge in Yunnan Province, the optimization of the design parameters of the main beam is studied by using numerical analysis, orthogonal test and genetic algorithm. This paper introduces the development history and research status of prestressed concrete continuous rigid frame bridge at home and abroad, and selects the ratio of side to middle span, the ratio of height to span of root beam, the ratio of height to span of span center beam, the ratio of side to middle span of main beam parameter, the ratio of height to span of root beam, and the ratio of height to span of span center beam. The four parameters of the curve line at the bottom of the beam are taken as variables, and the other design parameters are analyzed in constant quantity. (2) the method of numerical analysis and orthogonal test is adopted, and the internal force, stress, deflection and concrete content of the main beam are taken as the indexes. Two groups of 26 bridge finite element models were established. Through the analysis of the calculation results, the parameter combination mode of improving the mid-span performance of the main beam is obtained. The development history of the heuristic algorithm and the working principle of the genetic algorithm are introduced. Based on the optimization results of orthogonal experiments, genetic algorithm is used for further optimization calculation. Another group of 16 finite element models are established and optimized by MATLAB genetic algorithm toolbox. The more accurate combination of parameters is obtained, and the results are verified by orthogonal test.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.23

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