车辆动荷载与沥青路面力学响应研究
发布时间：2019-05-23 06:19
【摘要】：车辆动荷载是道路承受的主要荷载,道路因长期承受车辆荷载会出现破损和破坏。近年来,随着交通需求的增长,重载车辆增多,路面承受的振动荷载也越来越大,同时路面结构并不是承受理想的静载。所以本文模拟路面实际的加载状态,对动荷载作用下沥青路面各层的动态响应进行研究。车辆行驶的过程,实质上是车、路相互影响作用的过程。以正弦波路面函数描述路面不平整状况,建立1/4车辆动荷载模型,利用MATLAB软件分析车辆行驶速度、轮胎阻尼刚度和车辆参数对动载系数的影响,针对车辆荷载状况的不同,分析得出在空载、半载、满载以及不同超载率下,车辆动荷载的变化规律。基于多层弹性体系,将沥青路面结构分为面层、基层、底基层和土基,利用ANSYS有限元软件建立三维路面结构模型,研究了半波正弦荷载作用下路面结构的动态响应(主要包括动位移、动应力、动应变),并对比了静载作用下路面所受应力的差异。结果表明动载作用下,路面弯沉小于静载作用,层底拉应力、压应力略大于静载;因此,在当前的路面设计中,控制静载下的路面弯沉是偏于保守及安全的,但以其控制层底拉应力是偏小的,不能确切反映路面在动载下的受力状态。
[Abstract]:Vehicle dynamic load is the main load on the road, and the road will be damaged and destroyed because of the long-term vehicle load. In recent years, with the increase of traffic demand, the number of heavy load vehicles increases, and the vibration load on the pavement is also increasing. At the same time, the pavement structure is not subjected to ideal static load. Therefore, this paper simulates the actual loading state of asphalt pavement, and studies the dynamic response of each layer of asphalt pavement under dynamic load. The process of vehicle driving is essentially the process of interaction between vehicle and road. The sine wave pavement function is used to describe the uneven condition of the pavement, and the dynamic load model of 1 / 4 vehicle is established. The effects of vehicle speed, tire damping stiffness and vehicle parameters on the dynamic load coefficient are analyzed by MATLAB software. According to the different load conditions of the vehicle, the influence of vehicle speed, tire damping stiffness and vehicle parameters on the dynamic load coefficient is analyzed. The variation law of vehicle dynamic load under no load, half load, full load and different overload rate is analyzed. Based on the multi-layer elastic system, the asphalt pavement structure is divided into surface layer, base, subbase and soil foundation, and the three-dimensional pavement structure model is established by using ANSYS finite element software. The dynamic response of pavement structure under half-wave sinusoidal load (including dynamic displacement, dynamic stress, dynamic strain) is studied, and the difference of stress on pavement under static load is compared. The results show that the deflection of pavement under dynamic load is smaller than that under static load, and the tensile stress and compressive stress at the bottom of the layer are slightly higher than those under static load. Therefore, in the current pavement design, the pavement deflection under static load control is conservative and safe, but the tensile stress at the bottom of the control layer is small, which can not accurately reflect the stress state of the pavement under dynamic load.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217
本文编号：2483670
[Abstract]:Vehicle dynamic load is the main load on the road, and the road will be damaged and destroyed because of the long-term vehicle load. In recent years, with the increase of traffic demand, the number of heavy load vehicles increases, and the vibration load on the pavement is also increasing. At the same time, the pavement structure is not subjected to ideal static load. Therefore, this paper simulates the actual loading state of asphalt pavement, and studies the dynamic response of each layer of asphalt pavement under dynamic load. The process of vehicle driving is essentially the process of interaction between vehicle and road. The sine wave pavement function is used to describe the uneven condition of the pavement, and the dynamic load model of 1 / 4 vehicle is established. The effects of vehicle speed, tire damping stiffness and vehicle parameters on the dynamic load coefficient are analyzed by MATLAB software. According to the different load conditions of the vehicle, the influence of vehicle speed, tire damping stiffness and vehicle parameters on the dynamic load coefficient is analyzed. The variation law of vehicle dynamic load under no load, half load, full load and different overload rate is analyzed. Based on the multi-layer elastic system, the asphalt pavement structure is divided into surface layer, base, subbase and soil foundation, and the three-dimensional pavement structure model is established by using ANSYS finite element software. The dynamic response of pavement structure under half-wave sinusoidal load (including dynamic displacement, dynamic stress, dynamic strain) is studied, and the difference of stress on pavement under static load is compared. The results show that the deflection of pavement under dynamic load is smaller than that under static load, and the tensile stress and compressive stress at the bottom of the layer are slightly higher than those under static load. Therefore, in the current pavement design, the pavement deflection under static load control is conservative and safe, but the tensile stress at the bottom of the control layer is small, which can not accurately reflect the stress state of the pavement under dynamic load.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217
【参考文献】
相关期刊论文 前1条
1 殷立文;丁静声;;荷载接触面形状对沥青路面力学响应的影响[J];重庆交通大学学报(自然科学版);2010年04期
，本文编号：2483670
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