车辆荷载作用下沥青混凝土桥面铺装层力学特性研究

发布时间：2018-08-13 16:26

【摘要】：伴随着经济的快速发展，我国的桥梁事业取得了突飞猛进的发展。桥面铺装作为桥梁的重要组成部分，既是桥梁的受力层又是保护层，但在以往的桥梁建设和设计过程中，往往只是把桥面铺装列为附属结构，不做专门的计算力学分析，主要考虑路面设计和施工技术的要求。多年来，桥面铺装破坏的不断出现开始引起了道路桥梁界专家与学者的重视与关注。基于此，，本文通过建立三维桥面铺装结构体系有限元模型，利用ANSYS结构计算软件计算分析了铺装结构在荷载作用下铺装层的受力特性，期望能对桥面铺装结构设计计算理论进行一些有益的探索。全文主要计算内容分为了三个部分，第一部分是铺装结构在静力荷载作用下的受力特性分析，得出铺装层的竖向变形和主应力的最大值是出现在桥面铺装层顶面，铺装层的剪应力的最大值则是出现在上下铺装层间附近的位置，并且在此基础上还考虑了超载和水平力对铺装层受力特性的影响；第二部分主要是计算分析设有防水层的铺装结构在静力荷载作用下铺装层的受力特性，并与没有设防水层的铺装结构进行对比分析，得出有防水层的桥面铺装在竖向变形上要比没有设防水层的时候大一点，但设有防水层的桥面铺装的剪应力最大值在铺装上层和铺装下层的顶面位置要比没有设防水层的小，其中对铺装上层顶面剪应力的减小程度最大，随后还考虑了防水层弹性模量和防水层厚度对铺装层受力特性的影响；第三部分是桥面铺装在移动车荷载作用下的受力特性分析，得出桥面铺装在移动荷载作用时的应力和变形相比静力荷载作用时要小，且铺装层的剪应力的最大值出现在铺装下层的底面，最后考虑分析了车速、水平力和超载在动力计算时对桥面铺装受力特性的影响。
[Abstract]:With the rapid development of economy, bridge undertaking in our country has made rapid progress. As an important part of bridge, deck pavement is both the stress layer and the protective layer of bridge, but in the past bridge construction and design process, deck pavement was often regarded as an accessory structure without special computational mechanics analysis. Pavement design and construction technology should be considered. Over the years, the continuous occurrence of bridge deck pavement damage has begun to attract the attention of road and bridge experts and scholars.
Based on this, this paper establishes the finite element model of three-dimensional bridge deck pavement structure system, calculates and analyzes the mechanical characteristics of the pavement structure under load by using ANSYS structural calculation software, expecting to carry on some beneficial exploration to the design and calculation theory of bridge deck pavement structure.
The main contents of this paper are divided into three parts. The first part is the analysis of the mechanical characteristics of the pavement structure under static load. It is concluded that the maximum vertical deformation and principal stress of the pavement appear on the top of the deck pavement, and the maximum shear stress of the pavement appears near the upper and lower pavement layers. On this basis, the influence of overload and horizontal force on the mechanical characteristics of the pavement is also considered; the second part mainly calculates and analyzes the mechanical characteristics of the pavement with waterproof layer under static load, and compares with the pavement without waterproof layer, and obtains the vertical deformation of the deck pavement with waterproof layer. The maximum shear stress of deck pavement with waterproof layer is smaller than that without waterproof layer. The shear stress on the top of deck pavement with waterproof layer is the lowest, and the elastic modulus of waterproof layer and the thickness of waterproof layer are also considered. The third part is the analysis of the mechanical characteristics of the bridge deck pavement under moving vehicle load. It is concluded that the stress and deformation of the bridge deck pavement under moving load is smaller than that under static load, and the maximum shear stress of the pavement appears at the bottom of the pavement. Finally, the vehicle speed and level are considered. The influence of force and overload on the mechanical characteristics of bridge deck pavement during dynamic calculation.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.33

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