长山大桥的优化设计

发布时间：2018-02-24 17:26

本文关键词： 矮塔斜拉桥 ANSYS 参数化建模单目标优化多目标优化　出处：《大连海事大学》2015年硕士论文　论文类型：学位论文

【摘要】：为满足我国科学技术与经济的快速发展,矮塔斜拉桥的建设已成为现代的需求。随着矮塔斜拉桥跨度的不断增加,设计难度与施工难度越来越大。与此同时,设计与施工带来的成本也越来越高。因此,如何在保证安全可靠的基础上使得成本最低已经成为广大学者研究的方向。本文借助大连市长山大桥为背景,利用有限元软件ANSYS进行优化设计分析。首先,本文通过总结斜拉桥的发展历史与广大学者的研究成果,提出研究的方向与现代斜拉桥面临的挑战。其次,介绍了有关优化设计的一些概念、研究方法与设计步骤。同时,提出了结构优化设计的一些基本理论和数学模型。再次,本文分三部分进行优化。第一部分为桥墩的优化。选取单支墩厚度为设计变量,以桥墩强度和稳定性等作为约束条件,目标函数选取桥墩截面面积。通过零阶优化和一阶优化,得出优化结果,再与实际结果对比。第二部分为斜拉索的优化。选取斜拉索的初始应变为设计变量,以跨中位移为目标函数,通过优化降低索力。第三部分为多目标优化。通过将前两部分联合优化,最终得到了多目标优化的最优计算结果。最后,通过总结各章节的计算分析结果,提出一些建设性意见与展望,为斜拉桥的设计施工提供了一定的参考价值。
[Abstract]:In order to meet the rapid development of science and technology and economy in China, the construction of cable-stayed bridge with low tower has become a modern demand. With the increasing span of cable-stayed bridge with low tower, the design and construction are becoming more and more difficult. Therefore, how to ensure the lowest cost on the basis of safety and reliability has become the research direction of the majority of scholars. The background of this paper is the Changshan Bridge in Dalian. The finite element software ANSYS is used to analyze the optimal design. Firstly, by summarizing the development history of cable-stayed bridge and the research results of many scholars, this paper puts forward the research direction and the challenge of modern cable-stayed bridge. This paper introduces some concepts, research methods and design steps of optimization design. At the same time, some basic theories and mathematical models of structural optimization design are put forward. This paper is divided into three parts. The first part is the optimization of bridge piers. The thickness of single pier is chosen as design variable, the strength and stability of pier are taken as constraint conditions, and the cross-section area of pier is selected by objective function. Through zero order optimization and first order optimization, The optimization results are obtained and compared with the actual results. The second part is the optimization of the stay cables. The initial strain of the stay cables is selected as the design variable, and the mid-span displacement is taken as the objective function. The third part is multi-objective optimization. By combining the first two parts, the optimal calculation results of multi-objective optimization are obtained. Finally, by summing up the results of calculation and analysis of each chapter, Some constructive suggestions and prospects are put forward, which provide a certain reference value for the design and construction of cable-stayed bridges.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.5

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