中文摘要：

针对一座主跨200m的人车分离双层桥面曲线斜拉桥的人致振动问题,提出了应用连杆提高结构刚度、应用调谐质量阻尼器（TMD）增强阻尼的联合减振方案。研究表明：在人行桥主梁与车行桥主梁之间设置三对连杆可以显著提高结构的自振频率,使人行桥位于人致振动敏感频率内的模态数由8阶减少为5阶。该方案显著减小了减振装置成本,将采用纯TMD方案时的100t质量降低至40t。通过动力试验评估了联合减振方案的减振效果。结果表明：安装TMD后,人行桥横向加速度由150人时的0.2m/s2降低为400人时的0.06~0.08m/s2;侧向模态阻尼比提高6倍以上,竖弯模态阻尼比达到5%,没有观测到大幅振动现象。最后,探讨了内摩擦对水平和竖向TMD性能的影响。

英文摘要：

With the progress of ever-increasing bridge spans and the use of modern light and high strength materials accompanied by the pursuit of bridge aesthetic in urban areas, the modern footbridges tends to light, low damped, and therefore are vulnerable to human-induced vibrations. Structural vibration control has become indispensable for modern footbridge design. This study aims at structural vibration control of human-induced vibrations for a curved cable-stayed bridge with a main span of 200 m and a separated deck system for vehicles and pedestrians. This special configuration of the twin-deck system allows for the development of a hybrid control system that combines the steel link beams to improve the structural stiffness and the tuned mass dampers enhance the damping ratios for critical modes. With the steel link beams, the number of critical modes for the bridge reduces to 5 which would be 8 for the bridge without the steel link beams. Dynamic testing is carried out to evaluate the control performance of the hybrid system. Prior to the installation of the TMD, the maximum lateral acceleration is about 0.2 m/s2 for the footbridge with 150 walking persons, while it reduces to 0. 06-0.08 m/s2 for the footbridge with 400 walking persons after installation of TMD. The damping ratios for both the lateral and vertical modes increase appreciably, and no large amplitude vibrations are observed. The effects of internal friction on the control performance of lateral and vertical TMD are also discussed in some details.