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为了研究路桥过渡段不同区域的环境振动规律,针对109国道桑干河大桥过渡段,现场测试了不同车组匀速通过过渡段时路面结构的振动水平,分别从振动加速度时程、振动加速度频谱及振动加速度振级分析路面结构动力响应特性。由研究结果可知:振动加速度随距桥台距离的减小而增大,桥台附近桥面结构的振动加速度最大;在大型车辆附加荷载作用下,桥面结构主要为低频振动,小型车辆主要引起桥面结构的高频振动;加速度振级随车辆载荷的增大而增大,由于“跳车”现象,桥台附近桥面加速度振级最大;结合过渡段动力响应规律,控制过渡段沉降差是公路过渡段研究的重点。
In order to study the law of environmental vibration in different regions of road-bridge transitional section, in view of the transitional section of Sanggan River Bridge in 109 National Highway, the vibration level of the pavement structure of different vehicles passing through the transitional section was measured on site. From the vibration acceleration time history, Vibration Acceleration Vibration Level Analysis Dynamic Response Characteristics of Pavement Structure. The results show that the vibration acceleration increases with the decrease of the distance from the abutment, and the vibration acceleration of the bridge deck near the abutment is the largest. Under the additional load of large vehicles, the deck structure is mainly low-frequency vibration, and the small vehicles mainly cause The vibration amplitude of the deck increases with the increase of the vehicle load. Because of the phenomenon of “jerk”, the acceleration level of the bridge deck near the abutment is the largest. Combined with the dynamic response of the transitional section, the transition section Subsidence is the focus of highway transition section.