中文摘要：

自英国伦敦千禧桥因大幅横向振动问题导致开通三日不得不关闭事件以来,人行桥的振动问题（尤其是大幅横向振动）受到了学术界与工程界的普遍关注。以一座主跨200m的人车分离双层桥面曲线斜拉桥为背景,采用理论分析和现场试验手段对大桥的横向与竖向人致振动响应进行了理论分析与现场实测研究。人群行走动力试验表明,大桥在0.125人/m^2的人群密度下发生了大幅横向振动,0.2m/s^2可以作为引发横向动力失稳临界横向加速度值;桥面实测竖向动力响应远小于相同人群下的理论分析值。依据伦敦千禧桥试验数据建立的Dallard公式能够较好地预测横向动力失稳临界人数;简化单模态共振分析方法会显著高估竖向加速度响应,尤其是对于模态频率偏离步行力卓越频率的情况。

英文摘要：

Since the well‐known closure of the London Millennium Bridge after its openings of three days caused by the excessive lateral human‐induced vibration ,the human‐induced vibration has received wide attention from both academic researchers and structural engineers .In this study ,theoretical and experimental studies are carried out to evaluate the human‐induced vibra‐tions of a curved cable‐stayed bridge with a main span of 200m and separated deck system for traffics and pedestrians .Pedestri‐an stream test shows that the bridge experiences excessive lateral vibrations when it is loaded with a walking stream of 0 .125 person/m2 and the threshold of peak acceleration for initializing the human‐induced lateral dynamic instability is about 0 .2m/s2;the human‐induced vibration amplitude in vertical direction is far less than that predicted by the simple SDOF resonant model at the same pedestrian density .The Dallard formulae derived from actual test data on the London Millennium Bridge can be used to estimate the critical pedestrian for causing the lateral dynamic instability with good accuracy .The human‐induced vertical accelerations obtained with the simplified SDOF resonant model will be significantly overestimated ,especially when the modal frequency deviates from the dominant forcing frequency .