动态荷载作用下重载交通水泥混凝土路面的力学响应
发布时间：2018-09-07 06:30
【摘要】：水泥混凝土路面是我国高等级公路路面结构的主要形式之一。随着我国综合国力的进一步增强,基础建设取得新的成就,交通运输业迅猛发展。同时我国交通现状中也存在着不少问题。其一,我国现行规范对路面各项指标的规定均采用静态荷载,而实际情况中,车辆以一定速度行驶在路面上,对路面施加的动荷载是大小和作用位置都随时间变化的随机荷载,路面实际受力状态与在静态荷载下得到的水泥路面受力特性存在一定差别。其二,在运输车辆中,重型车及超重型车在公路运输中所占比重越来越高,车辆超限、超载问题日益突出,造成水泥混凝土路面早期破坏现象严重。所以对重载交通路面结构进行动力学分析有重要的理论意义和应用价值。本文针对重载交通的特征,在总结国内外研究成果的基础上,应用有限元分析理论,将水泥混凝土路面结构模拟为弹性层状体系,借助ANSYS软件建立的三维有限元分析模型,将车辆荷载模拟为稳态正弦移动荷载,在不同超载率下,对水泥混凝土路面在匀速状态,以及考虑水平荷载作用的加速状态、制动减速状态下的路面结构力学响应进行分析,得出荷载作用下路面各结构层弯沉、纵向应力、垂直压应力以及水平剪应力的时间历程曲线,并通过对计算结果进行比较确定不同行驶状态下,超载对加速路面损伤的影响规律。分析结果表明,水泥混凝土路面在路表取得最大弯沉值、最大纵向压应力、最大垂直压应力以及最大水平剪应力,在路面板底取得最大纵向拉应力。并且随着超载率的增加,路面结构应力和弯沉均随之增大。可见,重载道路载货汽车的超载现象是造成路面结构破坏的重要原因。
[Abstract]:Cement concrete pavement is one of the main forms of high-grade highway pavement structure in China. With the further enhancement of China's comprehensive national strength, new achievements have been made in infrastructure construction and the transportation industry has developed rapidly. At the same time, there are many problems in the present traffic situation in our country. First, the current code of our country all adopt static load to every index of road surface, but in practice, the vehicle travels on the pavement at a certain speed, and the dynamic load imposed on the road surface is a random load that changes in size and action position with time. There is a certain difference between the actual loading state of pavement and the mechanical characteristics of cement pavement under static load. Second, in the transportation vehicles, heavy vehicles and super heavy vehicles account for more and more high proportion in the road transportation. The overload problem of the vehicles is becoming more and more serious, which results in the serious early damage phenomenon of cement concrete pavement. Therefore, the dynamic analysis of heavy-haul traffic pavement structure has important theoretical significance and application value. In this paper, according to the characteristics of heavy haul traffic, on the basis of summarizing the research results at home and abroad, applying the theory of finite element analysis, the structure of cement concrete pavement is simulated as an elastic layered system, and the three-dimensional finite element analysis model is established by means of ANSYS software. The vehicle load is simulated as a steady sinusoidal moving load. Under different overloading rates, the mechanical response of pavement structure under the condition of uniform speed and acceleration under horizontal load and braking and deceleration is analyzed. The time history curves of deflection, longitudinal stress, vertical compressive stress and horizontal shear stress are obtained under load, and the calculated results are compared to determine the different driving states. The influence of overload on accelerated pavement damage. The results show that the maximum deflection value, the maximum longitudinal compressive stress, the maximum vertical compressive stress and the maximum horizontal shear stress of the cement concrete pavement are obtained on the pavement surface, and the maximum longitudinal tensile stress is obtained at the bottom of the pavement slab. And with the increase of overload ratio, the stress and deflection of pavement structure increase. It can be seen that overloading of heavy-haul road vehicles is an important cause of pavement structure damage.
【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】：U416.216
本文编号：2227475
[Abstract]:Cement concrete pavement is one of the main forms of high-grade highway pavement structure in China. With the further enhancement of China's comprehensive national strength, new achievements have been made in infrastructure construction and the transportation industry has developed rapidly. At the same time, there are many problems in the present traffic situation in our country. First, the current code of our country all adopt static load to every index of road surface, but in practice, the vehicle travels on the pavement at a certain speed, and the dynamic load imposed on the road surface is a random load that changes in size and action position with time. There is a certain difference between the actual loading state of pavement and the mechanical characteristics of cement pavement under static load. Second, in the transportation vehicles, heavy vehicles and super heavy vehicles account for more and more high proportion in the road transportation. The overload problem of the vehicles is becoming more and more serious, which results in the serious early damage phenomenon of cement concrete pavement. Therefore, the dynamic analysis of heavy-haul traffic pavement structure has important theoretical significance and application value. In this paper, according to the characteristics of heavy haul traffic, on the basis of summarizing the research results at home and abroad, applying the theory of finite element analysis, the structure of cement concrete pavement is simulated as an elastic layered system, and the three-dimensional finite element analysis model is established by means of ANSYS software. The vehicle load is simulated as a steady sinusoidal moving load. Under different overloading rates, the mechanical response of pavement structure under the condition of uniform speed and acceleration under horizontal load and braking and deceleration is analyzed. The time history curves of deflection, longitudinal stress, vertical compressive stress and horizontal shear stress are obtained under load, and the calculated results are compared to determine the different driving states. The influence of overload on accelerated pavement damage. The results show that the maximum deflection value, the maximum longitudinal compressive stress, the maximum vertical compressive stress and the maximum horizontal shear stress of the cement concrete pavement are obtained on the pavement surface, and the maximum longitudinal tensile stress is obtained at the bottom of the pavement slab. And with the increase of overload ratio, the stress and deflection of pavement structure increase. It can be seen that overloading of heavy-haul road vehicles is an important cause of pavement structure damage.
【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】：U416.216
【参考文献】
相关期刊论文 前1条
1 周华飞,蒋建群,毛根海;路面不平整引起的车辆动荷载分析[J];中国市政工程;2002年03期
，本文编号：2227475
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