As the new structural materials and long span footbridge being used these years, the vibration prob lem due to human-induced load has become a significant issue. Especially in regards to the light-weight FRP foot bridge , the weight of crowd can' t be overlooked, thus when analyzing the dynamic response of FRP footbridge, it' s necessary to consider the influence of crowd. In this paper, the human body internal driven force is introduced and derived, then the vertical coupling vibration equations are established. With the numerical analysis method, the dy namic response of an actual FRP cable-stayed footbridge is analyzed under different pedestrian flows, and the effect of reducing the dynamic response by paving a layer of concrete is also analyzed. All theoretical analysis shows that the FRP cable-stayed footbridge can meet the requirement of dynamic performance under human-induced load.%近年来随着新材料以及大跨度人行天桥的不断出现,由行人行走引起的振动问题日渐显著.尤其在轻质FRP人行天桥中,行人质量相对桥梁本身质量不可忽略,在计算FRP人行天桥动力响应时,需要考虑行人带来的影响.本文通过引入并推导了行人人体驱动力,建立起行人与人行天桥之间的耦合竖向振动方程.利用数值分析方法分析了一座实际FRP斜拉人行桥在不同行人通行量下的动力响应,并分析了上铺混凝土面层对改善动力响应的效果.理论分析表明,该FRP斜拉桥可满足对人行天桥动力性能的要求.
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