Abstract: Based on the structure type of Yunluo expressway test road, ANSYS was used to establish a three-dimensional finite element model. The response of asphalt pavement mechanical index under four kinds of contact forms of uniformly-distributed load such as rectangle, square, circle and ellipse under static loading was compared and analyzed. And the influence of load form on pavement structure design was also analyzed. The research results show that compared with the double circular uniformly-distributed load in the current code, the fatigue life calculated by the rectangular load is greatly different. The simplified form of rectangular load is not recommended in the structural design of asphalt pavement. Under square and elliptical loads, the response of each index is similar to that of circular loads. The design of asphalt pavement with square load is more secure than the specification, and the design of asphalt pavement with oval load is not as safe as the specification. Considering the convenience of mesh division in finite element calculation, the simplified form of square load can be adopted.

Key words: road engineering, asphalt pavement, uniform load, contact form, mechanical response

摘要： 以云罗高速公路试验路结构型式为基础，利用ANSYS建立三维有限元模型，对比分析静态作用下矩形、正方形、圆形、椭圆形四种均布荷载接触形式下沥青路面力学指标响应，并分析了荷载形式对路面结构设计的影响。研究结果表明：与现行规范中的双圆均布荷载相比，矩形荷载计算的疲劳寿命与规范相差较大，在进行沥青路面结构设计时，不建议采用矩形荷载简化形式；方形、椭圆形荷载作用下，各指标的响应同圆形荷载相差不大，采用方形荷载设计沥青路面较规范更安全，采用椭圆形荷载设计沥青路面不如规范安全性高；考虑到有限元计算中网格划分的便利性，可采用方形荷载简化形式进行路面设计。

关键词: 道路工程, 沥青路面, 均布荷载, 接触形式, 力学响应