木拱廊桥受力机理的有限元分析

发布时间：2018-07-01 08:28

本文选题：木拱廊桥 + 力学机理　；参考：《浙江大学》2014年硕士论文

【摘要】：我国古代桥梁历史悠久,形式丰富多样。浙闽木拱廊桥是我国古代木构桥梁结构中最具特色的精品,其结构形式精巧,有着很高的工程技术成就和人文价值。它解决了我国古代木结构大尺度无柱跨越的问题,是我国古代土木工程的遗产。近年随着人们对文物保护意识的提高,木拱廊桥作为文化遗产得到了政府文物部门和社会各界的保护,但目前对木拱廊桥主拱结构的传力机理的研究不足,使得对廊桥的保护和修缮缺乏理论依据。因此对木拱廊桥主拱结构在荷载作用下传力机理研究十分必要。本文在总结前人对木拱廊桥研究的基础上,采用数值有限元方法来研究木拱廊桥主拱的传力机理,从而指导今后廊桥的设计和修缮,本文是与浙江省文物考古研究所合作课题“木拱廊桥机理研究”的一部分。主要内容归纳如下：首先根据木拱廊桥的受力特征并由榫卯节点连接实验获得榫卯连接的半刚性特性,选用SAP2000有限元软件建立木拱廊桥主拱结构的数值模型,比较节点连接刚度对廊桥受力和变形的影响,可以得到在对廊桥的分析中考虑榫卯连接节点半刚性很有必要。然后利用有限元模拟获得木拱廊桥在满跨和半跨荷载工况下的内力和变形图,分析得到木拱廊桥主拱“编木”结构体系能改善结构内力和变形并提高结构的刚度。并通过对比分析了解木拱廊桥“马腿”对其受力和变形的影响。最后利用有限元方法模拟分析了木拱廊桥现实中存在的若干问题,例如苗杆与牛头之间空隙对廊桥的影响,不落地修复的可行性等问题。
[Abstract]:Ancient bridges in China have a long history and various forms. The wooden arcade bridge in Zhejiang and Fujian is the most distinctive one in the ancient wooden bridge structure of our country, its structure form is exquisite, has the very high engineering technical achievement and the humanities value. It solves the problem of large scale and no column span of ancient wood structure in China and is the heritage of ancient civil engineering in China. In recent years, with the improvement of people's awareness of cultural relic protection, wooden arcade bridge, as a cultural heritage, has been protected by the department of cultural relics of the government and all walks of life in society, but at present, there is insufficient research on the transmission mechanism of the main arch structure of wooden arcade bridge. It makes the protection and repair of the bridge lack of theoretical basis. Therefore, it is necessary to study the load transfer mechanism of the main arch structure of wooden arcade bridge. On the basis of summarizing the previous researches on wooden arcade bridge, this paper uses numerical finite element method to study the transmission mechanism of the main arch of wooden arcade bridge, so as to guide the design and repair of the bridge in the future. This paper is a part of the cooperation with Zhejiang Institute of Antiquities and Archaeology on the Mechanism of wooden Arch Gallery Bridge. The main contents are summarized as follows: firstly, according to the mechanical characteristics of the wooden arcade bridge and the semi-rigid characteristics of the tenon and joint connection experiment, the numerical model of the main arch structure of the wooden arcade bridge is established by using SAP2000 finite element software. By comparing the influence of joint stiffness on the stress and deformation of the bridge, it is found that it is necessary to consider the semi-rigidity of the joint in the analysis of the bridge. Then, the internal force and deformation diagram of wood arch corridor bridge under full span and half span load are obtained by finite element simulation. The "wood knitting" structure system of the main arch of wood arch corridor bridge can improve the internal force and deformation of the structure and increase the stiffness of the structure. The influence of horse legs on the stress and deformation of wooden arcade bridge is analyzed. Finally, some problems existing in the practice of wooden arcade bridge are simulated and analyzed by using the finite element method, such as the influence of gap between seedling rod and cow head on the bridge, the feasibility of non-landing restoration and so on.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441

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