Abstract: The application of innovative materials will cause changes in the mechanical properties of footbridges compared to those using traditional materials such as concrete or steel. Taking a suspension footbridge as the engineering background, the finite element model was established by Midas/Civil. According to different comparative working conditions, the original glass bridge deck of the bridge was replaced with CFRP, GFRP and composite concrete bridge decks, respectively. Comparative analysis and comprehensive evaluation of the static performance and natural vibration characteristics of local and overall bridge, human-induced vibration response and pedestrian comfort were conducted through finite element analysis. The results show that for both the local deck system and the overall bridge, using CFRP deck has the optimal static effect, and the vertical and lateral frequencies of each order are also the highest. When a single person generates excitation in the mid span, the lateral and vertical acceleration extremes are minimized, and pedestrian comfort is highest when using CFRP deck. CFRP deck can achieve maximum contribution to bridge stiffness with minimal mass, resulting in optimal performance, followed by GFRP deck. However, considering economic factors, GFRP deck has better applicability.

Key words: bridge engineering; suspension footbridge; innovative materials; bridge deck; natural vibration characteristics; human-induced vibration

摘要： 新材料的应用会使人行桥力学性能与采用传统混凝土或钢材时发生改变，以某人行悬索桥为工程背景，采用Midas/Civil建立有限元模型，根据不同的对比工况，将原桥中的玻璃桥面板分别替换为CFRP、GFRP和复合混凝土桥面板，通过有限元对局部及桥梁整体静力性能、自振特性和人致振动响应及行人舒适度进行了对比分析和综合评价。结果表明：对于局部面板体系和桥梁整体，采用CFRP板均具有最优的静力效应，各阶竖向和横向频率也最大；单人在跨中产生激励时，在采用CFRP板时横向和竖向加速度极值最小，行人舒适度最高；CFRP板可用最小质量实现对桥梁刚度的最大贡献性能最优，GFRP板次之，但考虑到经济因素，GFRP板的适用性更好。

关键词: 桥梁工程；人行悬索桥；新型材料；桥面板；自振特性；人致振动