沥青混凝土桥面铺装力学分析与试验研究
发布时间：2018-07-17 21:28
【摘要】：桥梁结构以其美观、快捷等特点在现代公路交通建设中备受青睐。沥青混凝土桥面铺装结构作为桥梁上部结构的重要组成部分,不仅起着传递分散车辆荷载的作用与此同时作为保护层避免水等有害物质对下层结构的侵蚀。近年来超载现象日趋严重,加上频繁出现的特殊天气条件对沥青混凝土桥面铺装结构造成了很严重的破坏,严重影响了行车安全与舒适性以及威胁到桥梁的使用寿命。因此研究水泥混凝土桥沥青混凝土铺装结构力学特性,确定影响其性能的主要力学指标,在此基础上有针对性的选择铺装材料具有明显的现实意义。本文通过使用Ansys有限元软件,主要作了以下分析计算:(1)选择具有代表性的半刚性沥青路面结构,就不同层间接触状态下的弯沉、最大主应力、最大剪应力以及轴载变化对各力学指标的影响规律展开研究。(2)在现有沥青混凝土铺装结构调查统计基础上,结合相关文献建立桥面铺装结构的简化模型;首先研究接触模型和连续模型的沥青混凝土层最大主应力、最大剪应力,防水层界面最大剪应力以及不同温差条件下铺装结构内部温度场与温度应力的分布规律;其次研究轴载以及水平力,沥青混凝土铺装结构参数、防水层参数、水泥调平层参数变化对上述主要力学指标的影响情况。(3)分析对比半刚性沥青路面结构与沥青混凝土桥面铺装结构主要力学指标;在此基础上选择聚丙烯抗裂纤维和PRCR两种沥青混凝土添加剂,进行了沥青混凝土的耐水性、耐高低温以及层间性能的试验验证。在上述计算分析以及路用性能试验验证基础上,研究认为:采用接近连续模型结构的沥青路面和沥青混凝土桥面铺装综合性能会有明显改善;以抗剪性能和温度应力作为沥青混凝土桥面铺装主控制指标;PRCR和聚丙烯抗裂纤维对沥青混凝土的改善效果要高于普通的改性沥青混凝土,PRCR改善效果明显优于聚丙烯抗裂纤维。
[Abstract]:Bridge structure is favored in modern highway traffic construction for its beautiful and quick features. As an important part of the bridge superstructure, asphalt concrete deck pavement not only acts as the transmission of dispersed vehicle load, but also acts as a protective layer to avoid the erosion of the substructure caused by harmful substances such as water. In recent years, the phenomenon of overloading is becoming more and more serious, and the special weather conditions frequently appear have caused very serious damage to the asphalt concrete bridge deck pavement structure, which has seriously affected the driving safety and comfort and threatened the service life of the bridge. Therefore, it is of great practical significance to study the mechanical properties of asphalt concrete pavement structure of cement concrete bridge and determine the main mechanical indexes that affect its performance. By using Ansys finite element software, this paper mainly makes the following analysis and calculation: (1) selecting the representative semi-rigid asphalt pavement structure, according to the deflection and maximum principal stress of different interlayer contact state, The effects of maximum shear stress and axial load on the mechanical properties are studied. (2) on the basis of investigation and statistics of existing asphalt concrete pavement structure, a simplified model of bridge deck pavement structure is established based on relevant literature. Firstly, the maximum principal stress, maximum shear stress at the interface of waterproof layer and the distribution law of temperature field and temperature stress in pavement structure under different temperature difference conditions are studied in the contact model and continuous model. Secondly, the axial load and horizontal force, the parameters of asphalt concrete pavement structure and waterproof layer are studied. The influence of cement leveling layer parameters on the above main mechanical indexes. (3) analyzing and comparing the main mechanical indexes between semi-rigid asphalt pavement structure and asphalt concrete bridge deck pavement structure; On this basis, two kinds of asphalt concrete additives, polypropylene anti-cracking fiber and PRCR, were selected to test the water resistance, high and low temperature resistance and interlayer performance of asphalt concrete. On the basis of the above calculation analysis and road performance test, it is concluded that the comprehensive performance of asphalt pavement and asphalt concrete bridge deck pavement with close to continuous model structure will be improved obviously; The improvement effect of PRCR and polypropylene fiber on asphalt concrete is better than that of conventional modified asphalt concrete and polypropylene fiber.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.33
本文编号：2130991
[Abstract]:Bridge structure is favored in modern highway traffic construction for its beautiful and quick features. As an important part of the bridge superstructure, asphalt concrete deck pavement not only acts as the transmission of dispersed vehicle load, but also acts as a protective layer to avoid the erosion of the substructure caused by harmful substances such as water. In recent years, the phenomenon of overloading is becoming more and more serious, and the special weather conditions frequently appear have caused very serious damage to the asphalt concrete bridge deck pavement structure, which has seriously affected the driving safety and comfort and threatened the service life of the bridge. Therefore, it is of great practical significance to study the mechanical properties of asphalt concrete pavement structure of cement concrete bridge and determine the main mechanical indexes that affect its performance. By using Ansys finite element software, this paper mainly makes the following analysis and calculation: (1) selecting the representative semi-rigid asphalt pavement structure, according to the deflection and maximum principal stress of different interlayer contact state, The effects of maximum shear stress and axial load on the mechanical properties are studied. (2) on the basis of investigation and statistics of existing asphalt concrete pavement structure, a simplified model of bridge deck pavement structure is established based on relevant literature. Firstly, the maximum principal stress, maximum shear stress at the interface of waterproof layer and the distribution law of temperature field and temperature stress in pavement structure under different temperature difference conditions are studied in the contact model and continuous model. Secondly, the axial load and horizontal force, the parameters of asphalt concrete pavement structure and waterproof layer are studied. The influence of cement leveling layer parameters on the above main mechanical indexes. (3) analyzing and comparing the main mechanical indexes between semi-rigid asphalt pavement structure and asphalt concrete bridge deck pavement structure; On this basis, two kinds of asphalt concrete additives, polypropylene anti-cracking fiber and PRCR, were selected to test the water resistance, high and low temperature resistance and interlayer performance of asphalt concrete. On the basis of the above calculation analysis and road performance test, it is concluded that the comprehensive performance of asphalt pavement and asphalt concrete bridge deck pavement with close to continuous model structure will be improved obviously; The improvement effect of PRCR and polypropylene fiber on asphalt concrete is better than that of conventional modified asphalt concrete and polypropylene fiber.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.33
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