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本文针对大跨度人行桥行人行走舒适性问题,以绵阳市三江大桥为例,提出了基于连杆与调频质量阻尼器组合的人行桥减振技术。为验证减振效果,实桥测试了该桥的动力特性和人群行走下的动力响应,结果表明理论计算与实际吻合较好,人群行走时最大水平加速度只有0.08m/s~2。实测表明基于链杆与调频质量阻尼器组合的减振技术是可行的,该组合减振技术既不影响结构的美观和整体受力情况,避免了大量采用TMD减振系统而提高造价,又能够达到满足人行舒适性的目的。
In this paper, the pedestrian walking comfort of long-span pedestrian bridges is taken as an example. Taking Sanjiang Bridge in Mianyang City as an example, the vibration reduction technology of pedestrian bridges based on the combination of connecting rod and FM mass damper is proposed. In order to verify the damping effect, the actual bridge test the dynamic characteristics of the bridge and the dynamic response of the crowd walking, the results show that the theoretical calculation is in good agreement with the actual, the maximum horizontal acceleration of the crowd walking only 0.08m / s ~ 2. The measured results show that the vibration damping technology based on the combination of chain bar and frequency modulation mass damper is feasible. The combination of vibration reduction technology does not affect the appearance of the structure and the overall force situation, to avoid using a large number of TMD vibration damping system to improve the cost, To meet the purpose of pedestrian comfort.