摘要
采用移动加载的动载模型,考虑非均布轮胎荷载模式以真实地模拟行车方式,建立三维有限元路面结构模型,分析了非均布移动荷载作用下路面结构的应力响应,以及不同行车速度对结构的影响,以探求移动荷载作用下表面裂缝的开裂机理.结果表明:移动荷载作用下结构内拉应力不至于引起表面裂缝的产生,但在轮迹带内边缘下最大剪应力比较大,对高速道路应注意高速下拉应力的影响;在低速的路面上更易出现表面纵向裂缝,对低速路面抗剪强度的控制尤为重要.
The moving load in consideration of the non-uniform tire pressure to simulate the real traveling situation is adopted.A 3D finite element model of semi-rigid pavement structure is established to analyse the stress response of structure and the influence of different velocity in order to search for the mechanism of surface-initiated cracking.The conclusion can be drawn that the stress can not lead to produce the top-down crack under the moving load.Relatively the maximum shearing stress is larger than stress and appears under the inside edge of tire.More attention should be paid to the influence of stress in high velocity in expressway.It is easier to produce the longitudinal surface-initiated cracking in the low velocity pavement.Therefore it is important to control the shear strength of pavement structure of highway in low velocity.
出处
《郑州大学学报（工学版）》
CAS
北大核心
2011年第5期87-90,共4页
Journal of Zhengzhou University（Engineering Science）
基金
国家自然科学基金资助项目(150978234)
关键词
移动荷载
表面裂缝
应力分析
路面结构
moving loading
surface-initiated cracking
stress analysis
pavement structure
