高阻尼橡胶在斜拉桥拉索减振中的应用

【作者】 刘海龙；

【导师】 胡兆同；

【作者基本信息】 长安大学 ， 桥梁与隧道工程， 2003， 硕士

【摘要】 涡激振、风雨振、尾流驰振、抖振等风致振动容易造成斜拉桥拉索锚固端疲劳，促使锈蚀加快，严重影响拉索的使用寿命。振动所引发的拉索过大振幅同时也使行人产生不安全感，影响行车的舒适性。随着斜拉桥跨径的增大，拉索长度增加，长、细拉索的振动问题越来越突出，已经成为制约斜拉桥向轻型化，大跨化发展障碍。近年来，在结构工程师采取的各种控制拉索风致振动的措施中，以附加阻尼器方式的应用最为广泛。本文进行了高阻尼橡胶性能试验，并在此基础上，开发设计出一种简便、实用的拉索振动被动控制装置——高阻尼橡胶剪切型阻尼器。通过理论计算分析，得出这种阻尼器充分利用了高阻尼橡胶材料的高耗能能力、粘弹性等特点，具有良好的减振效果。论文提出了阻尼器相应的设计方法，以供实际工程参考。更多还原

【Abstract】 The Vortex-excited Oscillation, Wake Galloping, Rain-Wind Vibration and Buffetting are the main cause of the fatigue in the vicinity of the anchorages on cables of Cable Stayed Bridges. The large amplitude of the cables vibration also makes passengers feel uncomfortable and have a suspicion of the bridge’s insurability. With the increase of the span length, more and more long, slim cables are used in the cable-stayed bridges. The vibration of cables that induced by wind has turned out to be a significant obstacle to the development of cable-stayed bridges to be lighter and span larger. In recent years, engineers have provided many countermeasures to control the vibration, including attaching dampers on cables. A new type of damper using High Damping Rubber is designed in this paper. The characteristic of the High Damping Rubber and the application of the damper on cables are discussed. Design method of the HDR damper is also provided in this paper.更多还原