人行桥的人致振动理论与动力设计_陈政清.pdfVIP

第 26 卷增刊 II Vol.26 Sup.II 工 程 力 学 2009 年 12 月 Dec. 2009 ENGINEERING MECHANICS 148 文章编号：1000-4750(2009)Sup.II-0148-12 人行桥的人致振动理论与动力设计 *陈政清，刘光栋 (湖南大学风工程研究中心，湖南，长沙 410082) 摘 要：随着人行桥跨度的不断增大、新型轻质高强材料的日益运用以及对桥梁美学和城市景观的追求，人行桥 的基频不断降低，其振动及带来的行走舒适性问题也相继日益突出。自英国千禧桥关闭事件以来，国内外学者对 人行桥的人致振动尤其是横向振动进行了大量的研究。该文介绍了人行桥的人致振动理论及动力设计方法，重点 阐述了人行桥大幅横向振动分析的主要理论：直接共振理论、人桥相互作用理论及参数共振理论。最后以国内某 曲线人行斜拉桥为例，展示了人行桥的动力设计全过程。 关键词：人行桥；步行荷载；人致振动；动力设计；减振设计 中图分类号：U441+.3; U448.11 文献标识码：A PEDESTRIAN-INDUCED VIBRATION THEORY AND DYNAMIC DESIGN OF FOOTBRIDGES *CHEN Zheng-qing , LIU Guang-dong (Wind Engineering Research Center, Hunan University, Changsha, Hunan 410082, China) Abstract: With the progress of ever-increasing span of footbridges and the application of modern light and high strength materials, as well as the pursuit of bridge aesthetic in urban areas, the fundamental frequency of modern flexible footbridges decreases significantly. Since the event of London Millennium Bridge which was closed due to excessive pedestrian-induced lateral vibration, considerable efforts have been devoted to pedestrian-induced vibration analysis, particularly the lateral vibration, and its mitigation for modern footbridges. In the present study, the fundamentals of pedestrian-induced vibration theory and dynamic design of footbridges are described. The emphasis is placed on three existing methods for analyzing the large-amplitude lateral vibration, namely the direct resonance method, the pedestrian-bridge interaction method and the parametric resonance method. Finally a curved cable-stayed footbridge is used as an example to demonstrate the dynamic design of footbridges. Key words: footbridges; pedestrian-induced forces; p