Impact Effect of Vehicle Bumping at Bridgehead on Pavement Structure

doi:10.3969/j.issn.1674-0696.2022.02.12

Abstract

Abstract: The impact effect of vehicle bumping at bridgehead on pavement structure of road bridge transition section was studied based on vehicle-road coupling models. The impact effect considering vehicle-road coupling on pavement was analyzed. The variation laws of vehicle impact coefficient and pavement vibration response changing with pavement elastic modulus and subgrade response modulus were studied, and the road design suggestions for road bridge transition section were put forward. The results show that: the vehicle impact coefficients and the effective influence scopes are reduced when vehicle-road coupling is considered; the pavement elastic modulus and subgrade response modulus have little influence on vehicle impact coefficients but have a great influence on pavement vibration response; the dynamic response should be considered in the design of road bridge transition section. It is dangerous to use the vehicle impact coefficient as the amplification factor of standard axle load, and it is recommended to use the pavement dynamic response coefficient. From the point view of controlling pavement vibration, the flexible pavement should be selected for the transition section of road and bridge, and meanwhile, the subgrade response modulus shall exceed 200 MPa/m.

Key words: highway engineering; bumping at bridgehead; vehicle-road coupling; DSD element; vehicle impact factor; road dynamic response

摘要： 基于车-路耦合动力学模型，研究桥头跳车对路桥过渡段路面结构的冲击效应。分析了考虑车-路耦合作用对路面冲击效应的影响，研究了车辆冲击系数和路面振动响应随路面弹性模量、路基反应模量的变化规律，提出了路桥过渡段的道路设计建议。结果表明：考虑车-路耦合作用后，车辆冲击系数和有效影响范围均有所减小；路面弹性模量、路基反应模量对车辆冲击系数影响不大，但对路面振动响应影响较大；路桥过渡段的路面结构设计应考虑路面动力响应，采用车辆冲击系数作为标准轴载的放大系数偏危险，建议采用路面动力反应系数；从控制路面振动角度出发，路桥过渡段宜选择柔性路面，同时路基反应模量应超过200 MPa/m。

关键词: 道路工程；桥头跳车；车-路耦合；分布式弹簧-阻尼单元；车辆冲击系数；路面振动响应

CLC Number:

U416.01

LI Yuhua. Impact Effect of Vehicle Bumping at Bridgehead on Pavement Structure[J]. Journal of Chongqing Jiaotong University(Natural Science), 2022, 41(02): 76-83.

李玉华. 桥头跳车对路面结构的冲击效应研究[J]. 重庆交通大学学报（自然科学版）, 2022, 41(02): 76-83.

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