The vibration responses of pedestrian bridges are mainly caused by two transmission routes of ground and airflow under vehicle excitation. In order to clarify the action mechanism and influence degree of ground excitation and airflow excitation on pedestrian bridges, based on stochastic theory and flow field analysis method, the calculation models of vehicle-induced ground excitation and airflow excitation considering the influence of vehicle length, vehicle width and bridge deck width are established respectively. Considering the effects of vehicle speed, road grade, and vehicle mass, the vibration response of a continuous steel box girder pedestrian bridge under the two transmission routes was analyzed in this study. The laws of vibration acceleration and stress were summarized, and the accuracy of the finite element model and the laws were verified by field-measured data. Results show that road grade and vehicle mass are the main factors causing the vibrations of pedestrian bridges under vehicle excitation. Vehicle speed has a great influence on structural vibration under airflow excitation. The vibration response is the largest at mid-span along the pedestrian bridge-length direction. When the vehicle speed is less than about 60 km/h, the influence of the airflow excitation on the structure may not be considered. On this basis, the comfort level of the pedestrian bridge was evaluated using the British Standards Institution. The given evaluation criteria of the pedestrian bridge complement the design regulations of the pedestrian bridge.

人行天桥的振动响应主要由车辆激励下的地面和气流两条传递途径引起。为了明确地面激励和气流激励对人行天桥的作用机理和影响程度，基于随机理论和流场分析方法，建立了考虑车辆长度、车辆影响的车辆地面激励和气流激励计算模型。宽度和桥面宽度分别确定。考虑车速、道路坡度和车辆质量的影响，本文对连续钢箱梁人行桥在两条传输路线下的振动响应进行了分析。总结了振动加速度和应力的规律，并通过现场实测数据验证了有限元模型和规律的准确性。结果表明，道路坡度和车辆质量是车辆激励下人行天桥振动的主要影响因素。车辆速度对气流激励下的结构振动影响较大。沿人行桥长度方向的跨中振动响应最大。当车速小于约60km/h时，可以不考虑气流激励对结构的影响。在此基础上，利用英国标准协会对人行天桥的舒适度进行了评价。给出的人行天桥评价标准是对人行天桥设计规范的补充。