路桥过渡段动力测试及病害劣化机理研究  

Dynamic Test of Road-Bridge Transition Section and Study of Degradation Mechanism

作　　者：董捷 武志辉 许高峰 

机构地区：[1]河北建筑工程学院土木工程学院,张家口市075000

出　　处：《公路》2017年第10期51-57,共7页Highway

基　　金：河北建筑工程学院校基金项目;项目编号B-201604;张家口市科技局计划项目;项目编号1411057A

摘　　要：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 environment vibration in different zones of the road-bridge transition section,based on the transition section of the Sanggan River Bridge on the National Highway No.109,vibration level of pavement structures are tested in site under uniform speed of different vehicles at the transition section.Vibration acceleration time histories,frequency spectra of vibration accelerations,andvibration acceleration level are analyzed to reveal pavement structure dynamic response characteristics.The results show that the acceleration responses increase with the decrease of the distance from the abutment,the vibration acceleration of pavement near the abutment is the largest.Bridge deck structure mainly generates low frequency vibration under large vehicles additional loads,and generates high frequency vibration under small size vehicles.The dynamic responses of acceleration vibration level increase with the vehicle loads increase,due to car-bounce at bridge-end,vibration level near abutment reaches the highest.Combining with the dynamic responses of transition section,strictly control the settlement difference is the key in the study of transition section.

关 键 词：路桥过渡段 现场测试 动力响应 附加荷载 沉降差 

分 类 号：U443.82[建筑科学—桥梁与隧道工程]