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

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