基于MTMD的大跨度人行悬索桥人致振动控制

大跨度人行悬索桥柔度大且阻尼小,易在人群荷载激励下产生过大振动,导致舒适度不满足规范要求。对于此类结构,需要采取有效减振措施控制其动力响应。本文介绍了多重调谐质量阻尼器(MTMD)对主跨600 m人行悬索桥的人致振动控制性能。利用有限元软件建立了某大跨度人行悬索桥模型,以德国EN03规范为计算依据,计算了悬索桥的人致振动响应,并重点分析了MTMD系统的人致振动控制效果。结果表明,即便人行悬索桥跨度达600 m,经合理设计的MTMD系统的减振效果仍十分明显,人行悬索桥多个模态的动力响应都得到有效抑制,其振动舒适度可满足规范要求。

Vibration control on of long-span pedestrian suspension bridge based on MTMD system

Due to large flexibility and low damping,long-span pedestrian suspension bridges are often vulnerable to excessive vibrations under pedestrian loads,leading to problems about pedestrian comfort.For such structures,effective measures need to be taken to reduce their dynamic responses.This paper presents the vibration mitigation performance of multiple tuned mass dampers (MTMD) on a pedestrian suspension bridge with a span of 600 m.We establish the finite element model of the pedestrian suspension bridge using Midas software,and compute its pedestrian-induced vibration responses based on the relevant contents in German Standard EN03,focusing on the performance analysis of the MTMD on pedestrian-induced vibration mitigation.Numerical results demonstrate that the vibration mitigation performance of the MTMD is significant if properly designed,even though the span is as long as 600 meters,and the dynamic responses of several vibration modes have been effectively suppressed.Thus the vibration serviceability can meet the requirements of the design code.