This research aims to assess the pedestrian comfort and to control human-induced vibration of an arch tower cable-stayed bridge without backstays located in canyon. Dynamic simulations of human-induced vibration were carried out with a mode-by-mode approach, and the results indicated that a total of seven lateral and vertical modes of the bridge may suffer from excessive vibrations at the design crowd density. Based on the periodic walking force, the structure response under pedestrian loads was evaluated performing dynamic analyses with two Finite Element models of the footbridge. A single tuned mass damper (STMD) control system was developed for control of human-induced vibration, which consisted of four tuned mass dampers mounted on the mid-span of bridge to enhance damping ratios of lively modes. The results indicate that the maximum acceleration for the first-order lateral and second-order vertical vibration at the design crowd density exceed the associated threshold values referring to the comfort level 1 (CL1) Criteria. The critical pedestrian number of lateral dynamic instability estimated by the Dallard’s empirical formula is much smaller than the dynamic design pedestrian number; and the Dallard’s empirical formula is applicable to estimate the critical pedestrian number of lateral dynamic instability for this bridge by comparing with Pedroe Inês footbridge. The damping ratios for both the vertical and lateral modes increase appreciably after installing the tuned mass dampers and no evidence of large-amplitude vibrations has been observed, leading to the realization of satisfactory comfort levels, which can provide reference for vibration reduction design of this kind of bridge.

本研究旨在评估行人舒适度并控制位于峡谷中的无背撑拱塔斜拉桥的人为振动。采用逐模态的方法进行了人为振动的动力模拟，结果表明，在设计人群密度下，桥梁共有 7 个横向和竖向模态可能会受到过度振动的影响。基于周期性行走力，通过使用人行桥的两个有限元模型执行动态分析，评估了行人荷载下的结构响应。开发了一种单调谐质量阻尼器 (STMD) 控制系统，用于控制人为振动，该系统由四个安装在桥梁跨中的调谐质量阻尼器组成，以提高活泼模式的阻尼比。结果表明，在设计人群密度下，一阶横向和二阶垂直振动的最大加速度超过了参考舒适度 1 (CL1) 标准的相关阈值。达拉德经验公式估计的横向动态失稳临界行人数远小于动态设计行人数；通过与 Pedroe Inês 人行桥的比较，Dallard 经验公式适用于估计该桥横向动力失稳的临界行人数量。安装调谐质量阻尼器后，垂直和横向模式的阻尼比都有显着增加，并且没有观察到大振幅振动的迹象，从而实现了令人满意的舒适度，