钢箱梁斜拉桥涡激振动控制的TMD参数研究

发布时间：2018-05-01 11:24

本文选题：涡激振动 + 钢箱梁斜拉桥　；参考：《西南交通大学》2015年硕士论文

【摘要】：斜拉桥是半个多世纪以来最富于想象力和构思内涵最丰富而引人注目的桥型,具有广泛的适应性。斜拉桥的梁体尺寸小,具有跨越能力较大,受桥下净空和桥面标高限制少便于悬臂施工等优点,成为我国大跨径桥梁最流行的桥型之一。但是,斜拉桥毕竟是柔性结构,在桥梁的使用和施工阶段容易因风的动力影响而发生不稳定的振动(如抖振、涡激共振、驰振、颤振),造成结构破坏,或人感不适,危及行车安全。本文以江海直达船航道桥为工程背景,对采用TMD(调谐质量阻尼器)控制其有可能发生涡激振动进行了相关的分析研究,并提出了相应的制振措施方案。本论文主要进行了以下几个方面的工作：首先对涡激振动的基本理论和研究方法进行了回顾,并从质量动力吸振、阻尼动力吸振以及主结构的阻尼效应三个方面对TMD的制振原理进行了简要的介绍。针对该桥进行了大尺度主梁节段模型风洞试验,对试验结果分析得知该桥发生明显的竖向涡激振动,并结合不同指标对涡激振动下的桥梁使用舒适度进行了评价。其二,结合该桥利用有限元软件建立桥-TMD计算模型,采用时程分析法分析了TMD各项参数对其制振效果的影响和对结构动力特性的影响,为合理选取TMD参数提供依据。其三,根据TMD谐振原理对江海直达船航道桥进行了涡激振动TMD参数设计分析,并讨论了不同质量比和阻尼比对制振效果的影响。
[Abstract]:Cable-stayed bridge is the most imaginative and attractive bridge type with wide adaptability for more than half a century. The cable-stayed bridge is one of the most popular bridges in our country because of its small size, large span capacity, less restrictions on bridge clearance and deck elevation, easy cantilever construction and so on. However, the cable-stayed bridge is a flexible structure after all. During the use and construction of the bridge, unstable vibration (such as buffeting, vortex-induced resonance, galloping vibration, flutter, structural damage, or human discomfort) can easily occur due to the dynamic effect of the wind. Endanger the safety of driving. In this paper, based on the engineering background of river and sea direct ship channel bridge, the possibility of vortex-induced vibration controlled by TMD (tuned mass damper) is analyzed and studied, and the corresponding vibration control measures are put forward. The main work of this thesis is as follows: firstly, the basic theory and research methods of vortex-induced vibration are reviewed, and the mass dynamic vibration absorption is carried out. The damping dynamic vibration absorption and the damping effect of the main structure are briefly introduced in this paper. The wind tunnel test of large-scale main girder model is carried out. The results show that the bridge has obvious vertical vortex-induced vibration, and the use comfort of the bridge under vortex-induced vibration is evaluated in combination with different indexes. Secondly, combined with the finite element software to establish the bridge TMD calculation model, the influence of TMD parameters on the vibration control effect and the dynamic characteristics of the structure is analyzed by using the time-history analysis method, which provides the basis for the reasonable selection of the TMD parameters. Thirdly, according to the TMD resonance principle, the vortex-induced vibration TMD parameters of the bridge are designed and analyzed, and the effects of different mass ratio and damping ratio on the vibration control efficiency are discussed.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3;U448.27

【参考文献】