风对廊桥的影响

发布时间：2018-04-24 14:28

本文选题：廊桥 + 主拱圈　；参考：《重庆交通大学》2014年硕士论文

【摘要】：近些年来，全国各地在现代化城市建设中，为满足人们的交通需求和审美要求，纷纷开始建立廊桥，廊桥结合各个地方的文化环境特色，风格各异。现代廊桥作为中国丰富的古典园林技术和现代桥梁技术的结合，是一次大胆的创新和尝试，，比古代廊桥更能适应现代社会的需求。但是，现代廊桥存在规模大、功能复杂、桥体结构与上部建筑结构之间关系复杂三个建设难点。目前，我国对现代廊桥的设计研究尚处在初探阶段，在风对廊桥影响方面的研究更少，鉴于廊桥因为桥屋的存在迎风面积大大增加，考虑风载的影响对桥梁的安全性是很必要的。本文以剑阁县剑门新区清江河景观廊桥为依托工程，运用有限元软件midas建立模型，分别分析主拱圈、立柱、桥墩等主要结构构件在廊桥无风荷载作用，与廊桥整体迎风两种情况下内力与变形的变化，并且将拱桥受风荷载作用的影响与廊桥相比较，最后据此提出相关建议意见，为同类廊桥的设计提供参考资料。按规范规定计算出静风风压，将风荷载加载到廊桥之后，廊桥的主要结构构件（主拱圈、立柱、桥墩）的y向剪力，扭矩Mx，绕z轴的弯矩均有不同程度的增加，在不同的荷载组合之下增长的倍数又有不同。将廊桥的分析结果对比拱桥加风载前后内力的变化，得知风荷载确实对廊桥内力的影响显著大过风对拱桥的影响，拱桥可以不考虑风的影响，但是为保证廊桥的安全与耐久性，廊桥设计时应该考虑风荷载的组合。
[Abstract]:In recent years, in the construction of modern cities, in order to meet the needs of people's transportation and aesthetic requirements, the bridge has begun to build a gallery bridge, which combines the cultural and environmental characteristics of various places, with different styles. As a combination of Chinese classical garden technology and modern bridge technology, modern gallery bridge is a bold innovation and attempt, which can meet the needs of modern society better than the ancient bridge. However, there are three difficulties in modern bridge construction, such as large scale, complex function and complex relationship between bridge structure and superstructure. At present, the research on the design of modern covered bridges in China is still in the initial stage, and the research on the influence of wind on the bridges is even less, in view of the fact that the windward area of the bridges is greatly increased because of the existence of the bridge houses. It is necessary to consider the influence of wind load on bridge safety. In this paper, based on the Qingjiang River landscape bridge in Jianmen New District, Jiange County, the finite element software midas is used to establish the model, and the main arch ring, column, pier and other main structural components are analyzed respectively without wind load on the bridge. The change of internal force and deformation of arch bridge under the condition of whole upwind is compared with that of the bridge under wind load. Based on this, some suggestions are put forward to provide reference for the design of the same kind of bridge. The static wind pressure is calculated according to the specification, and after the wind load is loaded into the bridge, the y-direction shear force, torque Mx and bending moment around z axis of the main structural members (main arch ring, column, pier) of the gallery bridge are all increased to varying degrees. The multiple increases under different load combinations are different. Comparing the analysis results of the bridge with the change of the internal force before and after the arch bridge is loaded with wind, it is found that the wind load does have a significant effect on the internal force of the bridge than the influence of the wind on the arch bridge, and the arch bridge may not consider the influence of the wind, but in order to ensure the safety and durability of the bridge, The combination of wind load should be considered in the design of the bridge.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441

【参考文献】