斜拉桥索梁锚固区局部应力分析及减震技术研究

发布时间：2018-05-25 02:43

本文选题：地震响应分析 + 液体粘滞阻尼器　；参考：《兰州交通大学》2017年硕士论文

【摘要】：因斜拉桥具有良好的力学性能,较大的跨越能力以及美观的外形近年来在我国发展迅猛。随着斜拉桥的发展和研究的深入,斜拉桥的振动控制逐步成为了工程应用领域中的热门课题。但目前对处于高震区的斜拉桥的地震响应资料及振动控制资料较少,因此,非常有必要对高震区斜拉桥的减震技术进行研究。索梁锚固区作为斜拉桥的薄弱部位,在进行重点设计时需要明确锚固区的应力分布。通常对索梁锚固区进行设计和研究时只考虑静力荷载影响,结果较为片面。考虑地震作用对锚固区局部应力的影响对于确保斜拉桥的安全使用非常重要。本文以藉河大桥为工程背景,具体研究内容如下:(1)对桥梁抗震设计理论、振动控制、索梁锚固结构试验与相关理论研究资料整理归纳。(2)考虑桩-土-结构作用对桥梁地震响应的影响,以有限元软件midas Civil建立藉河大桥的动力计算模型,进行特征值分析得到桥梁的动力特性。(3)通过时程分析法对安装液体粘滞阻尼器前后的动力计算模型分别进行地震响应分析,通过两种模型的地震响应分析结果的对比分析,液体粘滞阻尼器能够有效地减小斜拉桥的地震响应。(4)利用有限元软件ANSYS建立索力最大值相对应的索梁锚固区段的有限元实体模型,对索梁锚固区各个构件进行局部应力分析。(5)本文以提升桥梁安全储备考虑,提出索梁锚固区优化设计方案,进行索梁锚固区局部应力分析,对比原设计方案分析优化效果。(6)从提升桥梁结构安全性出发,首次在索梁锚固区局部应力分析中纳入地震作用对锚固结构的影响,分析地震作用对索梁锚固区局部应力的影响。
[Abstract]:The cable-stayed bridge has developed rapidly in China in recent years because of its good mechanical properties, large span ability and beautiful shape. With the development and research of cable-stayed bridge, vibration control of cable-stayed bridge has gradually become a hot topic in engineering application field. However, the seismic response data and vibration control data of cable-stayed bridge in high seismic area are very few, so it is very necessary to study the seismic absorption technology of cable-stayed bridge in high seismic area. As the weak part of cable-stayed bridge, the stress distribution of cable-beam Anchorage area should be clearly defined when the key design is carried out. The static load is considered in the design and research of cable-beam Anchorage zone, and the result is rather one-sided. It is very important to consider the influence of seismic action on the local stress in anchoring area to ensure the safe use of cable-stayed bridges. This paper takes the Yuhe Bridge as the engineering background, the specific research contents are as follows: 1) the bridge seismic design theory, vibration control, Considering the influence of pile-soil-structure interaction on bridge seismic response, the dynamic calculation model of Yuhe Bridge is established by finite element software midas Civil. Through eigenvalue analysis, the dynamic characteristics of the bridge are obtained. (3) the seismic response of the dynamic model before and after the installation of the liquid viscous damper is analyzed by time-history analysis, and the results of the seismic response analysis of the two models are compared and analyzed. Liquid viscous dampers can effectively reduce the seismic response of cable-stayed bridges. The finite element model of cable beam anchoring section corresponding to the maximum cable force is established by using finite element software ANSYS. In order to improve the safety reserve of bridge, the optimal design scheme of cable beam Anchorage zone is put forward, and the local stress analysis of cable beam Anchorage zone is carried out. According to the safety of hoisting bridge structure, the influence of seismic action on anchoring structure and the influence of seismic action on local stress of cable beam Anchorage zone are first included in the local stress analysis of cable beam Anchorage zone.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.27

【参考文献】