Abstract: The long-span pedestrian suspension bridge has the characteristics of light weight and low damping, and its natural vibration frequency is often very low, which is within the sensitive range of pedestrian step frequency. Therefore, human-induced vibration becomes a problem that cannot be ignored in the design of this type bridges, especially for suspension bridges in scenic spot. Based on the nonlinear finite element software, the typical vertical and lateral bending modes of the long-span glass suspension bridge in the Kanggu parkland were selected by using the direct resonance theory.Through the finite element time-history analysis method, the vertical and lateral acceleration response time-history curves of bridge deck under different crowd loads were calculated and obtained. The results show that the natural vibration frequency of the proposed bridge is small and the multi-order natural vibration frequencies are in the sensitive range of human step frequency.It is easy to cause obvious vibration of the bridge under the crowd step frequency excitation, which affects the comfort of the bridge. Therefore, the corresponding vibration reduction measures should be proposed.

Key words: bridge engineering, glass suspension bridge, human-induced vibration, pedestrian comfort, vibration reduction measures

摘要： 大跨度人行悬索桥具有轻柔、低阻尼的特点，其自振频率往往很低，处于行人步频敏感范围内，使得人致振动成为该类桥设计不可忽视的问题，尤其以游客密集的景区悬索桥更甚。基于非线性有限元软件，对亢谷景区大跨径玻璃悬索桥应用直接共振理论，选择典型竖弯和侧弯振型，通过有限元时程分析方法，计算获得不同人群荷载激励下桥面的竖向和侧向加速度响应时程曲线。结果表明：该桥自振频率小，多阶自振频率处于步频敏感范围内；在人群步频激励下易引起桥梁的明显振动，影响桥梁使用舒适性，为此提出相应减振措施。

关键词: 桥梁工程, 玻璃悬索桥, 人致振动, 行人舒适度, 减振措施