新型阻尼器在大跨度漂浮体系桥梁振动控制中的应用研究

Application research of new type damper in vibration control of long-span floating bridge

在正常运营过程中,风荷载、车辆荷载等日常动力荷载几乎时刻作用于漂浮体系桥梁,并引起较大的结构响应。大跨度桥梁因自身结构的特殊性,在频繁荷载激励下主梁容易产生过大的纵向累积位移,导致伸缩缝和支座提前破坏。对于高速铁路桥梁,现有的减隔震技术具有一定的局限性,未必适合控制发生频繁且作用速度较大的刹车荷载引起的结构响应。耐久性问题也制约着阻尼器在复杂动力荷载作用下的性能。众多工程案例表明,在系统考虑影响桥梁安全因素的前提下,针对性的制定解决方案,才能实现结构保护的目的。本文以粘滞阻尼器在实际应用中存在的问题为讨论点,从工程实际出发详细介绍了多种特殊性能阻尼器在桥梁振动控制中的应用效果和发展前景。

During normal operation,daily dynamic loads such as wind load and vehicle load act on the floating system bridge almost all the time and cause greater structural response.Due to the particularity of structure of the long-span bridge,the main beam is easy to produce excessive longitudinal cumulative displacement under frequent load excitation,which leads to the premature failure of expansion joints and supports.For high-speed railway bridges,the existing seismic isolation technology has certain limitations,and may not be suitable to control the structural response caused by the braking load with frequent occurrence and high speed.Durability issues also restrict the performance of the damper under complex dynamic loads.Numerous engineering cases show that the purpose of structural protection can be achieved,only by formulating targeted solutions under the premise of systematically considering factors affecting bridge safety.In this paper,taking the problems of viscous dampers in practical applications as the discussion point,and the application effects and development prospects of a variety of special performance dampers in bridge vibration control from the perspective of engineering needs are introduce.