关键词: 悬索人行桥；多重调频质量阻尼器；行人移动荷载；振动控制；动力反应

Abstract: Vibration responses of bridge structures in pedestrian moving loads have been a commonality and hot issues for footbridge design, especially for largespan bridges. Vibration control using MTMD for largespan suspension footbridges in pedestrian moving loads was focused in this study. The frequencyamplitude function of the bridgeMTMD system was derived based on the frequencydomain analysis method. Parameter optimizations of the MTMD, such as number, frequency bandwidth and damping ratio, were also conducted according to the frequency-amplitude function. And then, the vibration responses and control effects of the bridgeMTMD system in different pedestrian moving loads were discussed in detail. The results show that the bridge responses increase gradually with increasing of the number of the samerhythm pedestrians, and also with closing between the bridge and pedestrian frequencies. The optimized MTMD can ensure reliable and stable control for the vibration responses of the suspension bridge in wider frequency range. The safety and comfort of the large-span suspension footbridge in pedestrian moving loads can be well guaranteed using the MTMD technology.

Key words: suspension footbridge; multiple tuned mass damper; pedestrian moving loads; vibration control; dynamic responses